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SSC Physics Model Question,No-11



Class – X
Subject : Physics
Time : 2 hrs.                                                                                                                                         Marks. 50
(The figures in the margin indicate full marks. Answer any five questions from group A and any five questions from group B.)

1.         What is meant by S.I unit? What is fundamental unit.                                                                  1+1
2.         Establish the relation among displacement, acceleration and final velocity.                                   2
3.         How the hydroelectricity is produced and how the transformation of energy takes place             2
            in the process Explain. 
4.         Define in the case of wave -                                                                                                                  2
            i)   Time period             ii)  Frequency               iii)  Amplitude   iv)  phase
5.         What is the difference between heat capacity and specific heat.                                                  2
6.         What is an Otto cycle? Which is the working stroke.                                                                 1+1
7.         What is meant by a lens? Why a convex lens is called a converging lens.                                                1+1
8.         What is meant " by 220 V and 60 W"?                                                                                      2
9.         What is a transistor? How does a transistor amplify?                                                                              1+1
10.       What is radioactivity?                                                                                                                            2
Group B

11.       a)         From Newton's second law of motion prove the F =ma                                                 4
            b)         Show that if a body is projected vertically upward with initial velocity of half of
            the value g, it will fall on the surface of the earth after 1 sec.                                                       2

12.       a)         What do you understand by the transformation of energy? Give some examples of
            transformation of energy.
            b)         A car starting from rest moves with uniform acceleration and travels the 1st kilometer in 4          minutes. If the car moves with uniform velocity after this, how long will it take to travel the second
            kilometer.                                                                                                                                             2

13.       a)         What do you understand by acceleration due to gravity? Experimentally determine the
            value of acceleration due to gravity at a place using a simple pendulum.                                      4
            b)         An engine of power 20 km can lift 3000 kg of water at a vertical height of 10m in 1       2
            minute find (a)  output effective energy (b)  power output and (c)  efficiency of the engine.

14.       a)         Give a mathematical explanation of Pascal's  law for the transmission of fluid pressure.       4
            b)         What will be the co-efficient of real expansion of mercury when its co-efficient of apparent
            expansion with respect to glass is 14.66x10-5 K-1 and co-efficient of linear expansion of glass is
            0.0000 1 K -1 ?                                                                                                                                                2

15.       a)         What do you mean by Otto cycle? Explain with diagram the actions of four strokes of a             4
            petrol engine.
            b)         Find how much kilogram of ice will melt. The thormal conductivity of lead is 35 W m-1
            K-1 and relative latent heat of fusion of ice is 3.36 x1-5 JKg -1.2 .

16.       a)         Describe electromagnetic theory of light what is the reason of putting up theory of light?   4
            Give brief description of this theory.                                                                                                     
            b)         Three lamps of equal luminous intensity are placed at a distance 3 m and exactly two such
            lamps are placed at a distance 2m. Which will be more illuminated.                                              2

17.       a)         What are the characteristics of a good plane mirror? Prove that for a particular ray incident
            on a plane mirror the angle of rotation of the reflected ray is twice the angle of rotation of the
            mirror.                                                                                                                                                  4
            b)         If velocity of light in vacuum is 3x108 m/s then. Find the velocity of light in water,
            refractive index of water 1.33.                                                                                                   2
18.       a)         What are the principal defects of vision with ray diagram, explain how can they be remedied.  4
            b)         What do you mean by accommodation of eye? The least distance of distinct vision of a man
            is 25 cm. What does it mean.                                                                                                                2
19.       a)         What is resistance? State and explain the laws of resistance. Define specific resistance and
            give its mathematical expression                                                                                                            4
            b)         If a charge of 30 coulombs is placed in an electric field it gains a force of 15 Newton's
            if a chare of 20 Coulombs is placed at that point, what will be the force?                                                2
20.       a)         What is a p -n junction? Why is it called a p-n Junction diode? How does it work as a
            rectifier.                                                                                                                                                4
            b)         Describe in detail the domain theory of magnetism.                                                                    2

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