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PRACTICE PAPER

11TH PHYSICS 1ST TERM EXAM

MM 50                                        TIME 3 HRS

NOTE: -

Question no. 1 to 20 one mark each,

21 to 29 two marks each,

30 to 33 three marks each.

1.         While you try to take next step, which force plays the key role, in helping you?

(a) Gravitational force                      (b)Electrostatic force

(c) Electromagnetic force                (d) None of the above

2.         When a football is kicked high towards another player in the ground, what is the                             velocity of the football at the  highest point of its path?

(a) Always zero                                 (b) Sometimes zero

(c) Always non zero                         (d) Sometimes non zero

3.         What should a person on a freely rotating turn table do to decrease his (angular)                             speed?

(a) Bring his hands together           (b) Raise his hands up

(c) Spread his hands outwards       (d) Sit down with raised  hands

4.         A boy sitting in an open car moving with the constant speed throws a ball                                             straight up into the air. The ball falls

(a) behind him                                   (b) in front of him

(c)into his hand                                 (d) by his side

5.         A body is initially at rest. It undergoes one-dimensional motion with                                                    constant acceleration. The power delivered to  it at time t is proportional to

a)                                                   b)

c)                                                   d)

6.         A student is caries a bag weighing 5 kg from the ground   floor to his class on  the                             first floor that is 2 m high. The  work done by the boy is

(a) 1 J                                                 (b) 10 J

(c) 100 J                                             (d) 1000 J

7.         If the velocity of a body is doubled its kinetic energy

(a) gets doubled                                (b) becomes half

(c) does not change                         (d) becomes 4 times

8.         Light year is a unit of

(a) time                                               (b) distance

(c) sunlight intensity                        (d) mass

9.         In a system of units if force (F), acceleration (A) and time  (T) are taken as                                         fundamentals units then the dimensional   formula of energy is

(a)                                               (b)

(c)                                              (d)

10.       The most accurate reading of the length of a 6.28 cm long    fibre is

(a) 6 cm                                              (b) 6.5 cm

(c) 5.99 cm                                         (d) 6.0 cm

11.       The number of significant figures in the measured value   0.0204 is

(a) Five                                               (b) Three

(c) Four                                              (d) Two

12.       In Circular motion, the radius vector.

(a) has a constant magnitude and direction

(b) changes in magnitude and direction

(c) changes in magnitude but has a fixed direction

(d) changes in direction but has a fixed magnitude

13.       A tachometer is a device to measure

(a) Gravitational pull                         (b) Speed of rotation

(c) Surface tension                           (d) Tension in a spring

14.       When a car takes a turn on a horizontal road, the  centripetal force is provided                                 by the

(a) weight of the car

(b) normal reaction of the road

(c) frictional force between the surface of the road and the tyres of the car

(d) centrifugal force

15.       On which of the following factor does the moment of inertia of an object not                                     depend upon

(a) Axis of rotation                            (b) Angular velocity

(c) Distribution of mass                   (d) Mass of an object

16.       When the torque acting on the system is zero, which of the following is                                                 constant?

(a) Linear impulse                             (b) Linear momentum

(c) Force                                             (d) Angular momentum

16.       A couple produces,

(a) pure rotation                                (b) pure translation

(c) rotation and translation              (d) no motion

17.       Which of the following remains constant for a projectile fired from the Earth?

(a) kinetic energy                              (b) momentum

(c) horizontal component of velocity

(d) vertical component of velocity

18.       What is the minimum number of unequal forces whose  resultant will be zero?
(a) 1                                                     (b) 2
(c) 3                                                     (d) 4

19.       The mass of a body is 2 kg. It weight is

(a) 19.6 N                                            (b) 2 N

(c) 30 N                                               (d) 40 N

20.       The direction of impulse is

a) same as that of the net force

b) opposite to that of the net force

c) same as that of the final velocity

d) same as that of the initial velocity

21.       Differentiate between speed and velocity

OR

Differentiate between distance and displacement.

22.       Rest and motion are relative terms to each other, explain.

23.       Derive graphically the following equations

24.       What is the amount of work done by a force when a body moves in a circular                                     path?

OR

In a tug of war one team is slowly giving way to other. What work is being done             and             by whom?

25.       How does the kinetic energy of the object change if its momentum is doubled.

26.       A physical quantity is given as  The percentage   error in a, b, c and d is 1%,                                      3%,4% and 5% respectively. What is the percentage error the quantity?

27.       Give a method to estimate the size of moon.

OR

How will u find the height of an accessible object?

28.       Why do we prefer to use a wrench with a long arm?

OR

Why there are two propellers in a helicopter?

29.       Derive the relation between torque and angular momentum.

30.       Convert an energy of joule into erg.

OR

The centripetal force F acting on a particle moving uniformly in a circle may                                     depend upon   mass(m) velocity  (v) and radius (r) of the circle. Derive formula                                for F using method of dimensions.

31.       State triangle law of vectors addition. Find analytically the magnitude and                                         direction of resultant vector.

OR

Q         What is a projectile? Derive an expression for its trajectory when fired at an                                     angle with horizontal.

32.       Show that the total mechanical energy of a body falling under gravity is                                             conserved.

OR

Q         Show that in head on collision between two balls of equal masses moving along             a                 straight line, the balls simply exchange their velocities.

33        Obtain an expression for the position vector of centre of  mass of a two-particle                                 system.

OR

Q         Briefly explain the geometrical meaning of angular  momentum.

11TH PHYSICS 1ST TERM EXAM (Practice Paper) Reviewed by naresh on Sunday, November 14, 2021 Rating: 5