{"id":21371,"date":"2020-01-27T17:05:49","date_gmt":"2020-01-27T11:35:49","guid":{"rendered":"https:\/\/kseebsolutions.guru\/?p=21371"},"modified":"2021-07-02T15:26:28","modified_gmt":"2021-07-02T09:56:28","slug":"1st-puc-physics-model-question-paper-5","status":"publish","type":"post","link":"https:\/\/kseebsolutions.guru\/1st-puc-physics-model-question-paper-5\/","title":{"rendered":"1st PUC Physics Model Question Paper 5 for Practice"},"content":{"rendered":"

Students can Download 1st PUC Physics Model Question Paper 5 for Practice, Karnataka 1st PUC Physics Model Question Papers with Answers<\/a> helps you to revise the complete Karnataka State Board Syllabus and score more marks in your examinations.<\/p>\n

Karnataka 1st PUC Physics Model Question Paper 1 with Answers<\/h2>\n

Time: 3.15 Hours
\nMax Marks: 70<\/p>\n

General Instructions:<\/p>\n

    \n
  1. All parts are compulsory.<\/li>\n
  2. Draw relevant figure \/ diagram wherever necessary.<\/li>\n
  3. Numerical problems should be solved with relevant formulae.<\/li>\n<\/ol>\n

    Part – A<\/span><\/p>\n

    I. Answer the following questions. ( 10 \u00d7 1 = 10 )<\/span><\/p>\n

    Question 1.
    \nWrite the S I unit of momentum.
    \nAnswer:
    \nkg ms-1<\/sup><\/p>\n

    Question 2.
    \nIs scalar multiplied by a vector, a vector or a scalar?
    \nAnswer:
    \nIt is a vector<\/p>\n

    Question 3.
    \nWrite an expression for position vector of centre mass of system of two particles lie on x – axis
    \nAnswer:
    \nX = \\(\\frac{m_{1} x_{1}+m_{2} x_{2}}{m_{1}+m_{2}}\\)<\/p>\n

    \"KSEEB<\/p>\n

    Question 4.
    \nMention the expression for work done by a force in vector form.
    \nAnswer:
    \nW = \\(\\vec{F} \\cdot \\vec{S}\\)<\/p>\n

    Question 5.
    \nState Hook\u2019s law.
    \nAnswer:
    \nWith in elastic limit, stress is directly proportional to strain.<\/p>\n

    Question 6.
    \nAmong rubber and steel which one has more elasticity?
    \nAnswer:
    \nSteel.<\/p>\n

    Question 7.
    \nWhat is ideal gas?
    \nAnswer:
    \nA gas which obeys both Boyle\u2019s law and Charle\u2019s law is called ideal gas.<\/p>\n

    Question 8.
    \nDefine angle of contact.
    \nAnswer:
    \nIt is an angle between the tangent drawn to the surface of liquid at the point of contact with the surface of contact with in the liquid.<\/p>\n

    Question 9.
    \nState the first law of thermodynamics.
    \nAnswer:
    \nThe law stats that heat energy given to the system is equal to sum of the increase in internal energy and work done by the system.<\/p>\n

    \"KSEEB<\/p>\n

    Question 10.
    \nMention any one applications of beats.
    \nAnswer:<\/p>\n

      \n
    1. Beats are used to tune the musical instruments.<\/li>\n
    2. They are used to detect the poisonous gases in mines, or any use.<\/li>\n<\/ol>\n

      Part – B<\/span><\/p>\n

      II. Answer any FIVE of the following questions. ( 5 \u00d7 2 = 10 )<\/span><\/p>\n

      Question 11.
      \nMention any two basic forces in nature.<\/p>\n

      Question 12.
      \nMention two uses of dimensional analysis<\/p>\n

      Question 13.
      \nDistinguish between distance (path length) and displacement.
      \nAnswer:<\/p>\n\n\n\n\n\n\n
      Distance or path length<\/td>\nDisplacement<\/td>\n<\/tr>\n
      1. It is the length of the path along which the body moved.<\/td>\n1. It is the shortest distance between initial final positions.<\/td>\n<\/tr>\n
      2. It a scalar.<\/td>\n2. It is a vector.<\/td>\n<\/tr>\n
      3. It cannot be negative.<\/td>\n3. It can be negative, positive or zero.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      Question 14.
      \nWhat is centripetal acceleration? Give the expression for it.
      \nAnswer:
      \nThe acceleration of a body towards the centre of a circular path along which the body moves.
      \na = \u03bd2<\/sup> \/ r = r2<\/sup>\u03c9<\/p>\n

      \"KSEEB<\/p>\n

      Question 15.
      \nMention any two methods of reducing friction.<\/p>\n

      Question 16.
      \nDetermine the volume contraction of the solid copper cube, 10 cm on its edge, when subjected to hydraulic pressure of 7.0 \u00d7 106<\/sup> Pa. (Given bulk modulus of copper = 140 \u00d7 109<\/sup> Nm-2<\/sup>).
      \nAnswer:
      \n\\(B=\\frac{P}{\\frac{\\Delta V}{V}}=\\frac{P V}{\\Delta V} \\Rightarrow \\Delta V=\\frac{P V}{B}=\\frac{7 \\times 10^{6} \\times 10^{3} \\times 10^{-6}}{140 \\times 10^{9}}\\)
      \n= 0.05 \u00d7 10-3<\/sup>
      \n\u0394V = 5 \u00d7 10-5<\/sup>\u00a0m3<\/sup><\/p>\n

      Question 17.
      \nWhat is specific heat capacity of a substance? Write the relation between specific heat capacities of gases.
      \nAnswer:
      \nIt is the quantity of heat required to raise temperature of one kg of substance through one degree Celsius.
      \nCp<\/sub> – Cv<\/sub> = R<\/p>\n

      Question 18.
      \nOn an average the human heart is found to beat 75 times in minute. Calculate its frequency.
      \nAnswer:
      \nf = number of oscillations \/time
      \nf = \\(\\frac{75}{60}\\) = 1.25 Hz.<\/p>\n

      Part – C<\/span><\/p>\n

      III. Answer any FIVE of the following questions. ( 5 \u00d7 3 = 15 )<\/span><\/p>\n

      Question 19.
      \nState and explain Law of triangle of vectors. When will be the resultant of two given vectors is maximum?<\/p>\n

      Question 20:
      \nState Newton\u2019s second law of motion and hence derive F = ma.<\/p>\n

      \"KSEEB<\/p>\n

      Question 21.
      \nProve work- energy theorem for a constant force.<\/p>\n

      Question 22.
      \nDerive an expressions orbital speed of the earth’s satellite.<\/p>\n

      Question 23.
      \nState and explain Bernoulies theorem.<\/p>\n

      Question 24.
      \nWrite any three properties of heat radiation.<\/p>\n

      Question 25.
      \nState the law of equipartition of energy. Write an expression for the energy associated with diatomic molecule.
      \nAnswer:
      \nEnergy associated with distance molecule is V = 5 \\(\\left(\\frac{1}{2} R T\\right)\\)<\/p>\n

      Question 26.
      \nDiscuss the modes of vibrations in closed path.<\/p>\n

      Part-D<\/span><\/p>\n

      IV. Answer any TWO of the following questions. ( 2 \u00d7 5 = 10 )<\/span><\/p>\n

      Question 27.
      \nDerive x = v0<\/sub>t + \\(\\frac{1}{2}\\) at2<\/sup> by graphical method.<\/p>\n

      Question 28.
      \nState and prove the law of conservation of linear momentum in case of collision of two bodies.<\/p>\n

      Question 29.
      \nDerive the relation between torque and angular momentum of a particle.<\/p>\n

      V. Answer any TWO of the following questions. ( 2 \u00d7 5 = 10 )<\/span><\/p>\n

      Question 30.
      \nState and explain Kepler\u2019s laws of planetary motion.<\/p>\n

      \"KSEEB<\/p>\n

      Question 31.
      \nWrite a note on kelvin scale of temperature.
      \nAnswer:
      \nFrom Charles law V = V0<\/sub> (1 + \u03b1t) … (1)
      \nIf t = -273\u00b0C, then(1) \u21d2 V = V0<\/sub> \\(\\left(1-\\frac{273}{273}\\right)\\), V = 0
      \nVolume of gas becomes zero at -273\u00b0C theoretically which is shown in the above fig. But practically all known gases become liquids before attaining this temperature (-273\u00b0C). From Charles law this is the lowest possible temperature.<\/p>\n

      Lord Kelvin made a scale by taking -273\u00b0C as lowest temperature. It is called absolute scale of temperature. The lowest temperature is called absolute zero (0K = -273\u00b0C). The temperature on the Kelvin scale is called absolute temperate. The width of each degree on the Kelvin scale is equal to the width of each degree on Celsius scale. The relation between Celsius scale temperature (t) & Kelvin scale temperature (T) is given by
      \nT = (t + 273) K<\/p>\n

      Question 32.
      \nDerive an expression for period of simple pendulum.<\/p>\n

      VI. Answer any THREE of the following questions. ( 3 \u00d7 5 = 15 )<\/span><\/p>\n

      Question 33.
      \nThe ceiling of a long hall is 25 m high. What is the maximum horizontal distance that a ball thrown with a speed of 40 ms-1<\/sup> can go without hitting the ceiling of the hall?
      \nAnswer:
      \nh = \\(\\frac{u^{2} \\sin ^{2} \\theta}{2 g}\\)
      \n25 = \\(\\frac{(40)^{2} \\sin ^{2} \\theta}{2 \\times 9 \\cdot 8}\\)
      \n\u2234 \u03b8 = sin-1<\/sup> (0.5534) = 33.60\u00b0
      \nHorizontal range R = \\(\\frac{u^{2} \\sin 2 \\theta}{g}\\) = 150.33 m<\/p>\n

      Question 34.
      \nA pump on the ground floor of a building can pump up water to fill a tank of volume 30 m3<\/sup> in 15 min. If the tank is 40 m above the ground, and the efficiency of the pump is 30%, how much electric power is consumed by the pump?
      \nAnswer:
      \nP0 <\/sub>= \\(\\frac{\\text { Work done }}{\\text { Time }}=\\frac{m g h}{t}\\)
      \n= \\(\\frac{30 \\times 10^{3} \\times 9 \\cdot 8 \\times 40}{900}\\) = 13.067 \u00d7 103<\/sup> W
      \nFor input power Pi<\/sub>, efficiency \u03b7 is given by the relation:
      \nn = \\(\\frac{P_{0}}{P_{i}}\\) = 30%
      \nPi <\/sub>= \\(\\frac{13 \\cdot 067}{30}\\) \u00d7 100 \u00d7 103<\/sup>
      \n=0.436 \u00d7 105 <\/sup>W = 43.6 kw<\/p>\n

      Question 35.
      \nA 5 kg wheel is given an acceleration of 10 rad\/sec2<\/sup> by an applied torque of 2 N-m. Calculate its (a) moment of inertia and (b) radius of gyration.
      \nAnswer:
      \nI = \\(\\frac{\\tau}{\\alpha}=\\frac{2}{10}\\)
      \nI = 0.2 kgm2<\/sup>
      \nAnd I = MK2<\/sup>
      \nK = 0.2m<\/p>\n

      \"KSEEB<\/p>\n

      Question 36.
      \nA steam engine delivers 5.4 \u00d7 108<\/sup> J of work per minute and serves 3.6 \u00d7 109<\/sup> J of heat per minute from its boiler. What is the efficiency of the engine? How much heat is wasted per minute.
      \nAnswer:
      \n\u03b7 = \\(\\frac{w}{q_{1}}\\) = 5.4 \u00d7 108<\/sup> \/ 3.6 \u00d7 109<\/sup> = 15%
      \nQ2<\/sub> = Q1<\/sub> – W
      \n= 36 \u00d7 108<\/sup> – 5.4 \u00d7 108<\/sup> = 30.6 \u00d7 108<\/sup> J<\/p>\n

      Question 37.
      \nA train standing at the outer signal of railway station blows a whistle of frequency 400Hz in still air. (i) What is the frequency of the whistle for a platform observer when the train (a) approaches the platform with a speed of 10m\/s. (b) recedes from the platform with a speed of 10m\/s? (ii) What is the speed of the sound in each case, the speed of sound in still can be taken as 340m\/s.
      \nAnswer:
      \nf\u2019\u00a0= \\(\\frac{f v}{\\left(v-v_{s}\\right)}\\)
      \n=400 (340-0) \/ 340-10) = 412 Hz
      \nf” = \\(\\frac{f v}{\\left(v+v_{s}\\right)}\\)
      \nf” = 400(340) \/ (340+10) = 389 Hz<\/p>\n

      Karnataka 1st PUC Physics Model Question Paper 2 with Answers<\/h2>\n

      Time: 3.15 Hours
      \nMax Marks: 70<\/p>\n

      General Instructions:<\/p>\n

        \n
      1. All parts are compulsory.<\/li>\n
      2. Draw relevant figure \/ diagram wherever necessary.<\/li>\n
      3. Numerical problems should be solved with relevant formulae.<\/li>\n<\/ol>\n

        Part – A<\/span><\/p>\n

        I. Answer the following. ( 10 \u00d7 1 = 10 )<\/span><\/p>\n

        Question 1.
        \nMention the SI unit of luminous intensity.
        \nAnswer:
        \nCandela.<\/p>\n

        Question 2.
        \nDefine null vector.
        \nAnswer:
        \nA vector having zero magnitude.<\/p>\n

        Question 3.
        \nWhat is potential energy?
        \nAnswer:
        \nEnergy possessed by a body by virtue of its position or configuration.<\/p>\n

        Question 4.
        \nWrite the expression for moment of inertia of a solid sphere of radius R about its diameter.
        \nAnswer:
        \nI = \\(\\frac{2}{5}\\) MR2<\/sup><\/p>\n

        \"KSEEB<\/p>\n

        Question 5.
        \nWrite the distance of the geostationary satellite from the center of the earth.
        \nAnswer:
        \n42200 km<\/p>\n

        Question 6.
        \nState Hooke\u2019s law.
        \nAnswer:
        \nWithin the elastic limit, the stress in a body is directly proportional to strain.<\/p>\n

        Question 7.
        \nWhat is the principle behind the uplift of an aeroplane?
        \nAnswer:
        \nBernoulli\u2019s principle.<\/p>\n

        Question 8.
        \nGive an example for Greenhouse gas.
        \nAnswer:
        \nCarbon dioxide, nitrous oxide methane, chlorofloro carbon etc.<\/p>\n

        Question 9.
        \nWhat is the physical significance of Zeroth law of thermodynamics?
        \nAnswer:
        \nTemperature<\/p>\n

        \"KSEEB<\/p>\n

        Question 10.
        \nWhich quantity remains unchanged in isochoric process?
        \nAnswer:
        \nVolume<\/p>\n

        Part – B<\/span><\/p>\n

        II. Answer any FIVE of the following questions. ( 5 \u00d7 2 = 10 )<\/span><\/p>\n

        Question 11.
        \nName any two fundamental forces in nature.<\/p>\n

        Question 12.
        \nWrite two applications of dimensional analysis.
        \nAnswer:<\/p>\n

          \n
        1. Checking the dimensional consistency of equations<\/li>\n
        2. Deducing relation among the physical quantities<\/li>\n<\/ol>\n

          Question 13.
          \nDistinguish between \u2018path length\u2019 and \u2018displacement\u2019.
          \nAnswer:<\/p>\n\n\n\n\n\n
          Path length<\/td>\nDisplacement<\/td>\n<\/tr>\n
          1. It is a scalar<\/td>\n1. It is a vector<\/td>\n<\/tr>\n
          2. Is always positive<\/td>\n2. Positive or negative or zero<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

          Question 14.
          \nWrite the equation for the trajectory of a projectile motion. What is the nature of its trajectory?
          \nAnswer:
          \ny = x tan\u03b8 – \\(\\frac{g x^{2}}{v_{0}^{2} \\cos ^{2} \\theta_{0}}\\) and trajectory is parabola.<\/p>\n

          \"KSEEB<\/p>\n

          Question 15.
          \nState the two laws of friction.
          \nAnswer:<\/p>\n

            \n
          1. Limiting friction is independent of area of surface of contact of two bodies<\/li>\n
          2. Magnitude of limiting friction is directly proportional to normal reaction.<\/li>\n<\/ol>\n

            Question 16.
            \nWrite the equation for escape velocity and explain the terms used in the equation.
            \nAnswer:
            \nEscape velocity : ve<\/sub> = \\(\\sqrt{2 R g}\\) or v0<\/sub> = \\(\\sqrt{\\frac{2 G M}{R}}\\)
            \nR is radius of the earth, G is gravitational constant and M is mass of the earth.<\/p>\n

            Question 17.
            \nWhere is the velocity of the body maximum and minimum in case of simple harmonic motion?
            \nAnswer:<\/p>\n

              \n
            1. Mean position or equilibrium position<\/li>\n
            2. Extreme position<\/li>\n<\/ol>\n

              Question 18.
              \nWhat harmonics are present in a) an open pipe b) a closed pipe?
              \nAnswer:
              \n(a) All harmonics
              \n(b) Odd harmonics<\/p>\n

              Part – C<\/span><\/p>\n

              III. Answer any FIVE of the following questions. ( 5 \u00d7 3 = 15 )<\/span><\/p>\n

              Question 19.
              \nDefine centripetal acceleration? Write the expression for it and explain the terms.
              \nAnswer:
              \nDefinition:
              \n\\(a_{c}=\\frac{v^{2}}{r}\\)
              \nWhere v is velocity and r is radius of the circle.<\/p>\n

              \"KSEEB<\/p>\n

              Question 20.
              \nDeduce f = ma, using Newton\u2019s second law of motion.<\/p>\n

              Question 21.
              \nWhat is meant by collision? Distinguish between elastic and inelastic collision.<\/p>\n

              Question 22.
              \nDraw stress-strain curve. Show yield point and fracture point.<\/p>\n

              Question 23.
              \nMention three applications of capillarity.
              \nAnswer:<\/p>\n

                \n
              1. Rise of oil through wick of the lamp<\/li>\n
              2. Rise of water in the plant through xylem in plants<\/li>\n
              3. Absorption of ink by blotting paper\/chalk piece<\/li>\n<\/ol>\n

                Question 24.
                \nDerive \u03c3v<\/sub> = \\(\\frac{1}{T}\\) for ideal gas.<\/p>\n

                Question 25.
                \nDraw schematic diagram of the refrigerator. Define its coefficient of performance.<\/p>\n

                \"KSEEB<\/p>\n

                Question 26.
                \nGive the Newton\u2019s formula for the speed of sound in air and hence explain Laplace\u2019s correction.
                \nAnswer:
                \nAccording to Newton v = \\(\\sqrt{\\frac{p}{\\rho}}\\)<\/p>\n

                Part – D<\/span><\/p>\n

                IV. Answer any TWO of the following questions. ( 2 \u00d7 5 = 10 )<\/span><\/p>\n

                Question 27.
                \nWhat is v-t graph? Derive the equation x = v0<\/sub>t + \\(\\frac{1}{2}\\) at2<\/sup> using v – t graph.<\/p>\n

                Question 28.
                \nState and prove the law of conservation of linear momentum from Newton\u2019s third law of motion.<\/p>\n

                Question 29.
                \nDefine torque and hence derive \\(\\frac{d \\vec{l}}{d t}=\\vec{\\tau}\\)<\/p>\n

                V. Answer any TWO of the following questions. ( 2 \u00d7 5 = 10 )<\/span><\/p>\n

                Question 30.
                \nDerive the expression tor the variation of the acceleration due to gravity with altitude.<\/p>\n

                Question 31.
                \nExplain Carnot cycle with P-V diagram.<\/p>\n

                Question 32.
                \nDerive the expression for the time period of the simple pendulum.<\/p>\n

                VI. Answer any THREE of the following questions. ( 3 \u00d7 5 = 15 )<\/span><\/p>\n

                Question 33.
                \nA ball is thrown with the velocity of a 39.2 m\/s at an angle of 30\u00b0 with the horizontal. Calculate the maximum height, time of flight and horizontal range of the projectile.
                \nAnswer:
                \nMaximum height, Hm<\/sub> = \\(\\frac{v_{0}^{2} \\sin ^{2} \\theta}{2 g}\\) = 19.6 m
                \ntime of flight, tf<\/sub> = \\(\\frac{2 v_{0} \\sin \\theta}{g}\\) = 4s
                \nHorizontal range, R= \\(\\frac{v_{0}^{2} \\sin 2 \\theta}{g}\\) = 135.79 m<\/p>\n

                \"KSEEB<\/p>\n

                Question 34.
                \nA bullet of mass 50 gram moving with a velocity of 400 m\/s strikes a wall and goes out from the other side with a velocity of 100 m\/s. Calculate the work done in passing through the wall.
                \nAnswer:
                \nWork done W = KE2<\/sub> – KE1<\/sub>
                \nKE1<\/sub> = \\(\\frac{1}{2} m_{1} v_{1}^{2}\\) =4000 J
                \nKE2<\/sub> = \\(\\frac{1}{2} m v_{2}^{2}\\) = 250 J
                \nArriving at final answer
                \nW = KE2<\/sub> – KE1<\/sub> = 4000 – 250 = 3750 J<\/p>\n

                Question 35.
                \nThree pieces of iron of uniform thickness and mass m , m and 2m respectively are placed at the three corners of the triangle having co-ordinate (2.5, 1.5),(3.5, 1.5) and (3, 3) respectively. Find the center of mass of the system.
                \nAnswer:
                \nx = \\(\\frac{m_{1} x_{1}+m_{2} x_{2}+m_{3} x_{3}}{m_{1}+m_{2}+m_{3}}\\) = 3m
                \ny = \\(\\frac{m_{1} y_{1}+m_{2} y_{2}+m_{3} y_{3}}{m_{1}+m_{2}+m_{3}}\\) = 2.25 m
                \nWriting the co-ordinates of the centre of mass<\/p>\n

                Question 36.
                \nHow much it is required to convert 10 gram of ice at – 5\u00b0 into steam at 100\u00b0C. Given specific heat of ice 2.1 J g-10<\/sup>\u00a0C-1<\/sup>. Latent heat of steam = 2268 J g-1<\/sup>\u00a0and latent hear of fusion of ice is 336 J\/g. Specific heat of water = 4.2 J g-10<\/sup> C-1<\/sup>.
                \nAnswer:
                \nQ1<\/sub> = mSi\u00a0\u00a0<\/sub> \u0394T = 10 \u00d7 2.1 \u00d7 5 = 105 J
                \nQ2<\/sub> = mLf<\/sub> = 10 \u00d7 336 = 3360 J
                \nQ3<\/sub> =mSw\u00a0\u00a0<\/sub> \u0394T = 10 \u00d7 4.2 \u00d7 100 = 4200 J
                \nQ4<\/sub> =mLv<\/sub> =10 \u00d7 2268 = 22680 J
                \nQ = Q1<\/sub> + Q2<\/sub> + Q3<\/sub> + Q4<\/sub>
                \n= 105 + 3360 + 4200 + 22680 = 30345 J<\/p>\n

                \"KSEEB<\/p>\n

                Question 37.
                \nThe apparent frequency of a note when listener moves towards a stationary source with velocity 40 m\/s is 200 Hz. When he moves away from the same source with same speed the apparent frequency of note is 160 Hz. Calculate velocity of sound in air.
                \nAnswer:
                \nWhen the listener move towards source
                \n\\(r^{\\prime}=\\left(\\frac{v+v_{0}}{v}\\right) v\\) …(1)
                \nWhen the listener move away from the source \\(v^{\\prime \\prime}=\\left(\\frac{v-v_{0}}{v}\\right) v\\) …(2)
                \n(1) \u00f7 (2),
                \n\\(\\frac{v^{\\prime}}{v^{\\prime \\prime}}=\\left(\\frac{v+v_{0}}{v-v_{0}}\\right)\\)
                \nSolving and finding v =360 ms-1<\/sup><\/p>\n

                Karnataka 1st PUC Physics Model Question Paper 3 with Answers<\/h2>\n

                Time: 3.15 Hours
                \nMax Marks: 70<\/p>\n

                General Instructions:<\/p>\n

                  \n
                1. All parts are compulsory.<\/li>\n
                2. Draw relevant figure \/ diagram wherever necessary.<\/li>\n
                3. Numerical problems should be solved with relevant formulae.<\/li>\n<\/ol>\n

                  Part – A<\/span><\/p>\n

                  I. Answer the following ( 10 \u00d7 1 = 10 )<\/span><\/p>\n

                  Question 1.
                  \nWrite the dimensional formula for linear momentum.
                  \nAnswer:
                  \nM1<\/sup>L1<\/sup>T-1<\/sup><\/p>\n

                  Question 2.
                  \nWhat is unit vector?
                  \nAnswer:
                  \nIt is the vector having unit magnitude.<\/p>\n

                  Question 3.
                  \nDefine work done by the force.
                  \nAnswer:
                  \nWork is said to be done when force is applied on the body and the body displaces in the direction of applied force. w= \\(\\vec{F} \\cdot \\vec{S}\\)<\/p>\n

                  \"KSEEB<\/p>\n

                  Question 4.
                  \nDefine radius of gyration.
                  \nAnswer:
                  \nIt is the distance between the point at which the entire mass of the body is concentrated from the axis of rotation.<\/p>\n

                  Question 5.
                  \nWhat is the weight of a body at the centre of the earth?
                  \nAnswer:
                  \nzero<\/p>\n

                  Question 6.
                  \nName the SI unit of stress.
                  \nAnswer:
                  \nNm-2<\/sup><\/p>\n

                  Question 7.
                  \nWhat is streamline flow?
                  \nAnswer:
                  \nIt is the motion in which velocity of all the particles of fluid is same at a given point.<\/p>\n

                  Question 8.
                  \nMention the degrees of freedom for a triatomic gas molecule.
                  \nAnswer:
                  \n6<\/p>\n

                  Question 9.
                  \nWrite Newton\u2019s formula for speed of sound in air.
                  \nAnswer:
                  \n\\(V=\\sqrt{\\frac{p}{\\rho}}\\)<\/p>\n

                  \"KSEEB<\/p>\n

                  Question 10.
                  \nDefine amplitude of a wave.
                  \nAnswer:
                  \nIt is the maximum displacement of oscillating particle on either side of its mean position.<\/p>\n

                  Part – B<\/span><\/p>\n

                  II. Answer any FIVE of the following questions. ( 5 \u00d7 2 = 10 )<\/span><\/p>\n

                  Question 11.
                  \nName any two fundamental forces in nature.<\/p>\n

                  Question 12.
                  \nMention any uses of dimensional analysis.
                  \nAnswer:<\/p>\n

                    \n
                  1. To check the correctness of an equation.<\/li>\n
                  2. To derive the relation between various physical quantities.<\/li>\n<\/ol>\n

                    Question 13.
                    \nState triangle law of vector addition.<\/p>\n

                    Question 14.
                    \nMention any two methods of reducing friction.<\/p>\n

                    Question 15.
                    \nDefine average velocity and instantaneous velocity.<\/p>\n

                    Question 16.
                    \nState and explain first law of thermodynamics.<\/p>\n

                    Question 17.
                    \nWrite the relation between g and G and explain the terms.
                    \nAnswer:
                    \ng = \\(\\frac{G M}{R^{2}}\\)
                    \nExplanation of terms<\/p>\n

                    \"KSEEB<\/p>\n

                    Question 18.
                    \nMention an expression for the period of oscillation of a spring and explain the terms.
                    \nAnswer:
                    \nT = \\(2 \\pi \\sqrt{\\frac{m}{k}}\\)
                    \nExplanation of terms<\/p>\n

                    Part – C<\/span><\/p>\n

                    III. Answer any FIVE of the following questions. ( 5 \u00d7 3 = 15 )<\/span><\/p>\n

                    Question 19.
                    \nObtain an expression for time of flight of a projectile.<\/p>\n

                    Question 20.
                    \nUsing Newton\u2019s second law of motion, arrive at F = ma,<\/p>\n

                    Question 21.
                    \nDerive an expression for kinetic energy.<\/p>\n

                    Question 22.
                    \nMention the three types of moduli of elasticity.
                    \nAnswer:<\/p>\n

                      \n
                    1. Young\u2019s Modulus (Y)<\/li>\n
                    2. Bulk Modulus (B)<\/li>\n
                    3. Rigidity modulus (R)<\/li>\n<\/ol>\n

                      Question 23.
                      \nState and explain Bernoulli\u2019s principle.<\/p>\n

                      \"KSEEB<\/p>\n

                      Question 24.
                      \nDefine (a) Specific heat of gas at constant volume (b) Specific heat of gas at constant pressure (c) Latent heat of fusion.<\/p>\n

                      Question 25.
                      \nWrite any three postulates of kinetic theory of gasses.<\/p>\n

                      Question 26.
                      \nGive any three differences between progressive wave and a stationary wave.
                      \nAnswer:<\/p>\n\n\n\n\n\n\n
                      Progressive wave<\/td>\nStationary wave<\/td>\n<\/tr>\n
                      1. The wave travel forward with a velocity called wave velocity.<\/td>\n1. The wave do not travel in any direction.<\/td>\n<\/tr>\n
                      2. There is transfer of energy along the direction of propagation of wave.<\/td>\n2. There is no transfer of energy across any section of the medium.<\/td>\n<\/tr>\n
                      3. No particle of the medium is permanently at rest.<\/td>\n3. Particles at nodes are always at rest.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                      Part – D<\/span><\/p>\n

                      IV. Answer any TWO of the following questions. ( 2 \u00d7 5 = 10 )<\/span><\/p>\n

                      Question 27.
                      \nWhat is uniform circular motion? Derive an expression for centripetal acceleration.<\/p>\n

                      Question 28.
                      \nState and explain a) Parallel axis theorem and b) perpendicular axes theorem.<\/p>\n

                      \"KSEEB<\/p>\n

                      Question 29.
                      \nDerive an expression for maximum speed of a car moving on banked circular road.
                      \nAnswer:
                      \nFigure
                      \nN cos \u03b8 = Fs<\/sub> sin \u03b8 + mg
                      \nN = \\(\\frac{m g}{\\cos \\theta-\\mu_{s} \\sin \\theta}\\)
                      \nv = \\(\\frac{r g\\left(\\sin \\theta+\\mu_{s} \\cos \\theta\\right)}{\\cos \\theta-\\mu_{s} \\sin \\theta}\\)
                      \nv = \\(\\sqrt{\\frac{r g\\left(\\tan \\theta+\\mu_{s}\\right)}{\\left(1-\\mu_{s} \\tan \\theta\\right)}}\\)<\/p>\n

                      V. Answer any TWO of the following questions. ( 2 \u00d7 5 = 10 )<\/span><\/p>\n

                      Question 30.
                      \nDefine Orbital speed of a satellite. Obtain an expression for the orbital speed of satellite.<\/p>\n

                      Question 31.
                      \nState and explain the Newton\u2019s law of cooling.<\/p>\n

                      Question 32.
                      \nWhat is SHM? Write its characteristics and give its graphical representation.<\/p>\n

                      VI. Answer any THREE of the following questions. ( 3 \u00d7 5 = 15 )<\/span><\/p>\n

                      Question 33.
                      \nA stone is dropped from top of a tower 100 m height. At the same instant another stone is thrown vertically upward from the base of the tower with the velocity of 25 m\/s. When and where will the two stones meet?
                      \nGiven g = 10 m\/s2<\/sup>.
                      \nAnswer:
                      \nFor Stone A, u = 0, S = x and a = + g = 10 m\/s2<\/sup>
                      \nFormula s = ut + \\(\\frac{1}{2}\\) at2<\/sup>
                      \nArriving at x = 5t2<\/sup> —(l)
                      \nFor stone B s = 100 – x, a = – g and u = 25 m\/s
                      \nArriving at 100 – x = 25t – 5t2<\/sup> …(2)
                      \nObtaining t = 4 second
                      \nObtaining x = 80 m<\/p>\n

                      \"KSEEB<\/p>\n

                      Question 34.
                      \nA bullet of mass 0.015 kg strikes a metal plate of thickness 10 cm with a velocity of 400 m\/s and emerge from it with a velocity of 260 m\/s. Find the average resistance offered by the plate to the motion of bullet.
                      \nAnswer:
                      \nFormula work done = \\(\\frac{1}{2} m u^{2}-\\frac{1}{2} m v^{2}\\)
                      \nSubstitution and obtaining w = 693 J
                      \nW=FS
                      \nF = 6930 N<\/p>\n

                      Question 35.
                      \nA fly wheel of mass 12.5 kg and diameter 0.36 m rotating at 90 rpm has its speed increased to 720 rpm in 8s. Find the torque applied to flywheel.
                      \nAnswer:
                      \n\u03c91<\/sub> = 2\u03c0f1<\/sub> = 3\u03c0 rad\/sec
                      \n\u03c92<\/sub> = 2\u03c0f2<\/sub> = 24 \u03c0 rad\/sec
                      \n\u03b1 = \u03c92<\/sub> – \u03c91<\/sub> \/ t = 8.243 rad\/s2<\/sup>
                      \n\u03c4 = 1\u03b1 = (Mr2<\/sup> \/ 2) \u03b1
                      \n\u03c4 = 1.669 Nm<\/p>\n

                      Question 36.
                      \nA Carnot engine has an efficiency of 0.3, when the temperature of the sink is 350K. Find the change in temperature of the source when the efficiency becomes 0.5.
                      \nAnswer:
                      \n\u03b71<\/sub>\u00a0= 1 – \\(\\frac{T_{2}}{T_{1}}\\)
                      \nSolving for T = 500 K
                      \n\u03b72<\/sub> = 1 – \\(\\frac{T_{2}}{T_{1}^{2}}\\)
                      \nSolving for T1<\/sub>1<\/sup>= 700K
                      \nChange in temperature = 200 K<\/p>\n

                      \"KSEEB<\/p>\n

                      Question 37.
                      \nA train is moving at speed of 72 kmph towards a station, is sounding a whistle of frequency 600 Hz. What are the apparent frequencies of the whistle as heard by a man on the plot form when the train (a) approaches him (b) recedes from him? (speed of sound in air = 340 m\/s)
                      \nAnswer:
                      \nFormula
                      \na) f\u2032 = \\(\\left(\\frac{V}{V-V_{s}}\\right)\\) f
                      \nobtaining f = 637.5 Hz
                      \nb) f\u2032 = \\(\\left(\\frac{V}{V+V_{s}}\\right)\\) f
                      \nObtaining f = 566.7 Hz<\/p>\n

                      Karnataka 1st PUC Physics Model Question Paper 4 with Answers<\/h2>\n

                      Time: 3.15 Hours
                      \nMax Marks: 70<\/p>\n

                      General Instructions:<\/p>\n

                        \n
                      1. All parts are compulsory.<\/li>\n
                      2. Draw relevant figure \/ diagram wherever necessary.<\/li>\n
                      3. Numerical problems should be solved with relevant formulae.<\/li>\n<\/ol>\n

                        Part – A<\/span><\/p>\n

                        I. Answer the following ( 10 \u00d7 1 = 10 )<\/span><\/p>\n

                        Question 1.
                        \nHow many meters make one parsec?
                        \nAnswer:
                        \n3.08 \u00d7 1016<\/sup> m.<\/p>\n

                        Question 2.
                        \nWhat is unit vector?
                        \nAnswer:
                        \nA vector whose magnitude is equal to one.<\/p>\n

                        Question 3.
                        \nWhen does the work done by a force is zero?
                        \nAnswer:
                        \nIf the force acts at angle of 90\u00b0 or if the displacement is zero.<\/p>\n

                        Question 4.
                        \nDefine torque.
                        \nAnswer:
                        \nThe rotating effect of the applied force is called torque.<\/p>\n

                        \"KSEEB<\/p>\n

                        Question 5.
                        \nMention the value of escape speed of an earth satellite?
                        \nAnswer:
                        \n11.2 km\/s<\/p>\n

                        Question 6.
                        \nState Pascal\u2019s law.
                        \nAnswer:
                        \nIt states that if change in pressure is produced in any part of an enclosed fluid (liquid or gas), the same is transmitted equally to all points of the fluid in all directions.<\/p>\n

                        Question 7.
                        \nGive Principle of calorimetry.
                        \nAnswer:
                        \nIf there is no loss of heat energy by radiation, heat lost by hot body is equal to heat gained by cold body.<\/p>\n

                        Question 8.
                        \nWhat is equation of state for adiabatic process?
                        \nAnswer:
                        \nPV\u03d2<\/sup>\u00a0= constant<\/p>\n

                        Question 9.
                        \nName a factor on which internal energy of the gas depends.
                        \nAnswer:
                        \nTemperature\/pressure.<\/p>\n

                        \"KSEEB<\/p>\n

                        Question 10.
                        \nWhat happens to the time period of a simple pendulum when it is taken from equator to the pole?
                        \nAnswer:
                        \n2 seconds.<\/p>\n

                        Part – B<\/span><\/p>\n

                        II. Answer any FIVE of the following questions. ( 5 \u00d7 2 = 10 )<\/span><\/p>\n

                        Question 11.
                        \nMention any two basic forces in nature.
                        \nAnswer:
                        \nGravitational force, Electrostatic force and nuclear force.<\/p>\n

                        Question 12.
                        \nThe resistance R = \\(\\frac{v}{I}\\) where V = (100 \u00b1 5) volt and I = (10 \u00b1 0.2)A, Find the percentage error in R.
                        \nAnswer:
                        \nThe percentage error in V is 5% and that in current is 2% therefore error in R is 5%+ 2% = 7%<\/p>\n

                        Question 13.
                        \nDistinguish between distance and displacement.
                        \nAnswer:<\/p>\n\n\n\n\n\n\n
                        Distance<\/td>\nDisplacement<\/td>\n<\/tr>\n
                        1. It is the actual path length between the initial and final positions of the body during motion.<\/td>\n1. It is the shortest distance between the initial and final positions of the body during motion.<\/td>\n<\/tr>\n
                        2. It is a scalar quantity.<\/td>\n2. It is a vector quantity.<\/td>\n<\/tr>\n
                        3. It is never zero or negative, but is always positive.<\/td>\n3. It may be zero or positive or negative.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                        Question 14.
                        \nWrite the expression for range of the projectile? For what angle of projection it is maximum?
                        \nAnswer:
                        \nR = \\(\\frac{u^{2} \\sin 2 \\theta}{g}\\) if \u03b8 = 45\u00b0.<\/p>\n

                        \"KSEEB<\/p>\n

                        Question 15.
                        \nMention two methods of reducing friction.<\/p>\n

                        Question 16.
                        \nGive two general conditions of equilibrium of a rigid body.<\/p>\n

                        Question 17.
                        \nDefine Gravitational potential energy: Give expression for it.
                        \nAnswer:
                        \nEnergy possessed by the body by virtue of its position or configuration.
                        \nP.E = mgh.<\/p>\n

                        Question 18.
                        \nWhat is Doppler effect? Mention one of its applications.
                        \nAnswer:
                        \nApparent change in the frequency of source of sound due to relative motion between source and the observer.
                        \nIt is used in SONAR, over speeding of the vehicles RADAR etc.<\/p>\n

                        Part – C<\/span><\/p>\n

                        III. Answer any FIVE of the following questions. ( 5 \u00d7 3 = 15 )<\/span><\/p>\n

                        Question 19.
                        \nDerive the expression for centripetal acceleration.<\/p>\n

                        Question 20.
                        \nState Newton\u2019s first law of motion? Hence define force and inertia.<\/p>\n

                        Question 21.
                        \nProve work-energy theorem for a constant force.<\/p>\n

                        \"KSEEB<\/p>\n

                        Question 22.
                        \nCompare equations of linear and rotational motion.<\/p>\n

                        Question 23.
                        \nDerivation of pressure at a point inside a liquid.<\/p>\n

                        Question 24.
                        \nState Stefan\u2019s law and Draw the intensity distribution graph of black body radiation.
                        \nAnswer:
                        \nIt states that the total amount of heat energy radiated per second per unit area of a perfect black body is directly proportional to the fourth power of the absolute temperature of the surface of the body.
                        \n\"1st<\/p>\n

                        Question 25.
                        \nMention three postulates of Kinetic theory of gases.<\/p>\n

                        Question 26.
                        \nExplain Laplace\u2019s correction to Newton\u2019s formula for the Speed of a sound wave.<\/p>\n

                        Part – D<\/span><\/p>\n

                        IV. Answer any TWO of the following questions. ( 2 \u00d7 5 = 10 )<\/span><\/p>\n

                        Question 27.
                        \nDerive x = v0<\/sub>t + \\(\\frac{1}{2}\\) at2<\/sup> by graphical method.<\/p>\n

                        \"KSEEB<\/p>\n

                        Question 28.
                        \nDerive the expression for maximum safe speed of a vehicle on a banked road in circular motion.<\/p>\n

                        Question 29.
                        \nState and explain the parallel axis and perpendicular axis theorem.<\/p>\n

                        V. Answer any TWO of the following questions. ( 2 \u00d7 5 = 10 )<\/span><\/p>\n

                        Question 30.
                        \nState and explain Hooke\u2019s law. Draw Stress – strain curve with labeling the parts.<\/p>\n

                        Question 31.
                        \nGraphically represent the variation of coefficient of volume expansion of copper as a function of temperature. Derive \u03b1 V = \\(\\frac{1}{T}\\) for an ideal gas.<\/p>\n

                        Question 32.
                        \nDerive the expression for time period of a simple pendulum.<\/p>\n

                        VI. Answer any THREE of the following questions.( 3 \u00d7 5 = 15 )<\/span><\/p>\n

                        Question 33.
                        \nA particle starts from origin at t = 0 with a velocity 5\u00ee ms-1<\/sup> and moves in x-y plane under the action of a force which produces a constant acceleration of (4\u00ee + 2\\(\\hat{j}\\)) ms-2<\/sup>.
                        \n(a) What is the y-coordinate of the particle at an instant when its x-coordinate is 84 m?
                        \n(b) What is the speed of the particle at this time?
                        \nAnswer:
                        \n\\(\\vec{r}=\\vec{v}_{0}+\\frac{1}{2} \\vec{a} t^{2}\\)
                        \nX (t) = 5t + 2t2<\/sup>
                        \nY(t) = 1.0 t2<\/sup>
                        \nt = 5.26 s
                        \nY(t) = 27.7 m
                        \nV = 28.08 m\/s<\/p>\n

                        \"KSEEB<\/p>\n

                        Question 34.
                        \nA pump on the ground floor of a building can pump up water to All a tank of volume 40m3<\/sup> in 20 minutes if the tank is 30m above the ground and the efficiency of the pump is 60%. How much electric power is consumed by the pump? Given density of water = 1000 kg\/m3<\/sup> and acceleration due to gravity = 9.8m\/s2<\/sup>.
                        \nAnswer:
                        \n\\(P_{0}=\\frac{W}{t}=\\frac{m g h}{t}=\\frac{\\rho V m g h}{t}\\)
                        \nSubstitution
                        \nP0<\/sub> =9.8 \u00d7 10+3<\/sup> W
                        \nP0<\/sub> = 9.8 kW \/ 0.6 = 16.33 kW<\/p>\n

                        Question 35.
                        \nThe planet Mars take 1.88 years to complete on revolution around the sun. The mean distance of the earth from the Sun is 1.5 x 108<\/sup> km. Calculate that of planet Mars?
                        \nAnswer:
                        \n\\(\\frac{T^{2}}{a^{3}}\\) = constant
                        \n\\(\\frac{T_{2}^{2}}{T_{1}^{2}}=\\frac{a_{2}^{3}}{a_{1}^{3}}\\)
                        \nSubstitution
                        \na2<\/sub> = 22.8 \u00d7 1010<\/sup> m<\/p>\n

                        Question 36.
                        \nA steam engine delivers 7.5 \u00d7 108<\/sup> J of work per minute and services 3.6 \u00d7 109<\/sup> J of heat per minute from its boiler. What is the efficiency of the engine? How much heat is wasted per minute? Also And the ratio of temperature of sink to the source.
                        \nAnswer:
                        \n\u03b7 = \\(\\frac{p_{0}}{p_{1}}\\)
                        \n\u03b7 = 0.21
                        \nP0<\/sub> = Pi<\/sub> = 47.5 MW
                        \n\u03b7 = 1 – \\(\\frac{T_{1}}{T_{2}}\\)
                        \n\\(\\frac{T_{1}}{T_{2}}\\) = 0.79<\/p>\n

                        \"KSEEB<\/p>\n

                        Question 37.
                        \nA particle executes SHM along the x-axis, its displacement varies with the time according to the equation: x(t) = 5.4 cos (6\u03c0t + \u03c0\/4), where x(t) in metre and t is in second. Determine the amplitude, frequency, period and initial phase of the motion.
                        \nAnswer:
                        \nDetermine the amplitude, frequency, period and initial phase of the motion.
                        \nx(t) = 5.4 cos (6\u03c0t + \\(\\frac{\\pi}{4}\\))
                        \nA = 5.4 m
                        \nn = 3 Hz
                        \nT = 0.333 s
                        \nInitial phase = \u03a6 = \\(\\frac{\\pi}{4}\\)<\/p>\n","protected":false},"excerpt":{"rendered":"

                        Students can Download 1st PUC Physics Model Question Paper 5 for Practice, Karnataka 1st PUC Physics Model Question Papers with Answers helps you to revise the complete Karnataka State Board Syllabus and score more marks in your examinations. Karnataka 1st PUC Physics Model Question Paper 1 with Answers Time: 3.15 Hours Max Marks: 70 General …<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[81],"tags":[],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/posts\/21371"}],"collection":[{"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/comments?post=21371"}],"version-history":[{"count":0,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/posts\/21371\/revisions"}],"wp:attachment":[{"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/media?parent=21371"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/categories?post=21371"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/tags?post=21371"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}