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Shilpa

HomeAuthor: ShilpaPage 23

Assertion : A quick collision between two bodies is more violent than slow collision, even when initial and final velocities are identical. Reason : The rate of change of momentum determine that force is small or large.

a) If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : A kinetic energy of a body is quadrupled, when its velocity is doubled. Reason : Kinetic energy is proportional to square of velocity

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : Power developed in circular motion is always zero. Reason : Work done in case of circular motion is zero.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : A body cannot have energy without having momentum but it can have momentum without having energy. Reason : Momentum and energy have same dimensions.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : In an elastic collision of two bodies, the momentum and energy of each body is conserved. Reason : If two bodies stick to each other, after colliding, the collision is said to be perfectly elastic.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : When the force retards the motion of a body, the work done is zero. Reason : Work done depends on angle between force and displacement.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : According to law of conservation of mechanical energy change in potential energy is equal and opposite to the change in kinetic energy. Reason : Mechanical energy is not a conserved quantity.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : The power of a pump which raises 100 kg of water in 10sec to a height of 100 m is 10 KW. Reason : The practical unit of power is horse power.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : Water at the foot of the water fall is always at different temperature from that at the top. Reason : The potential energy of water at the top is converted into heat energy during falling.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : The rate of change of total momentum of a many particle system is proportional to the sum of the internal forces of the system. Reason : Internal forces can change the kinetic energy but not the momentum of the system.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : The change in kinetic energy of a particle is equal to the work done on it by the net force. Reason : Change in kinetic energy of particle is equal to the work done only in case of a system of one particle.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : The work done during a round trip is always zero. Reason : No force is required to move a body in its round trip.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

8. A rocket is propelled by a gas which is initially at a temperature of 4000 K. The temperature of the gas falls to 1000 K as it leaves the exhaust nozzle. The gas which will acquire the largest momentum while leaving the nozzle, is

  (a)  Hydrogen                          (b)  Helium (c)   Nitrogen                            (d)  Argon Ans. d (8)

Assertion : Comets move around the sun in elliptical orbits. The gravitational force on the comet due to sun is not normal to the comet’s velocity but the work done by the gravitational force over every complete orbit of the comet is zero. Reason : Gravitational force is a non conservative force.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : A spring has potential energy, both when it is compressed or stretched. Reason : In compressing or stretching, work is done on the spring against the restoring force.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

18. One day on a spacecraft corresponds to 2 days on the earth. The speed of the spacecraft relative to the earth is

(a) 1.5 x 10 ^ 8 ms ^-1                   (b)  2. 1 x...

Assertion : The instantaneous power of an agent is measured as the dot product of instantaneous velocity and the force acting on it at that instant. Reason : The unit of instantaneous power is watt.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

17. A stick of 1 m is moving with velocity of 2.7 x 10 ^ 8 ms ^-1 . What is the apparent length of the stick  (c = 3 x 10 ^ 8 ms ^-1)

(a)  10 m                                   (b)  0.22 m (c)   0.44 m                               (d)  2.4 m Ans. c (17)

Assertion : A light body and heavy body have same momentum. Then they also have same kinetic energy. Reason : Kinetic energy does not depend on mass of the body.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : When a gas is allowed to expand, work done by gas is positive. Reason : Force due to gaseous pressure and displacement (of piston) are in the same direction.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

15. A pulley fixed to the ceilling carries a string with blocks of mass m and 3 m attached to its ends. The masses of string and pulley are negligible. When the system is released, its centre of mass moves with what acceleration

(a)  0                                         (b) g/4 (c)   g/2                             ...

3. Assertion : Work done by friction on a body sliding down an inclined plane is positive. Reason : Work done is greater than zero, if angle between force and displacement is acute or both are in same direction.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : A person working on a horizontal road with a load on his head does no work. Reason : No work is said to be done, if directions of force and displacement of load are perpendicular to each other.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

11. The vector sum of two forces is perpendicular to their vector differences. In that case, the force

(a)  Are equal to each other in magnitude (b)  Are not equal to each other in magnitude (c)   Cannot be...

10. A false balance has equal arms. An object weigh X when placed in one pan and Y when placed in other pan, then the weight W of the object is equal to

(a)     √X Y (b) X + Y / 2 (c) X2 + Y2 / 2 (d) 2 / √X2 +...

5. Three weights W, 2W and 3W are connected to identical springs suspended from a rigid horizontal rod. The assembly of the rod and the weights fall freely. The positions of the weights from the rod are such that

(a)      3W will be farthest (b)  W will be farthest (c)   All will be at the same distance (d)  2W...

A ship of mass 3 x 10 ^7 kg initially at rest is pulled by a force of 5 x 10 ^ 4 N through a distance of 3 m. Assume that the resistance due to water is negligible, the speed of the ship is

(a)      1.5 m/s                                      (b)  60 m/s (c)   0.1 m/s                              (d)  5 m/s Ans. c (10)

2. A closed compartment containing gas is moving with some acceleration in horizontal direction. Neglect effect of gravity. Then the pressure in the compartment is

(a)  Same everywhere             (b)  Lower in front side (c)   Lower in rear side            (d)  Lower in upper side Ans. b...

A body moves from rest with a constant acceleration. Which one of the following graphs represents the variation of its kinetic energy K with the distance travelled x ?

Answer:  c   (16)

The graph between E and v is

Answer:    a (9)

When forces   F1 , F2 , F3 , are acting on a particle of mass m such that F2   and F4   are mutually perpendicular, then the particle remains stationary. If the force F1  is now removed then the acceleration of the particle is

(a) F 1  / m                                 (b)...

A particle is placed at the origin and a force is acting  F=kx  on it (where k is positive constant). If  U(0)=0, the graph of U(x) versus x will be (where U is the potential energy function)

Answer:   a (7)

4. The mass of a body measured by a physical balance in a lift at rest is found to be m. If the lift is going up with an acceleration a, its mass will be measured as

(a)   m (1- a/g)                              (b) m...

The relationship between the force F and position x of a body is as shown in figure. The work done in displacing the body from x = 1 m to x = 5 m will be

  (a)  30 J (b)  15 J (c)   25 J (d)  20 J Answer:  b (6)

The diagrams represent the potential energy U of a function of the inter-atomic distance r. Which diagram corresponds to stable molecules found in nature.

Answer:  a (22)

A particle of mass m moving with a velocity u makes an elastic one dimensional collision with a stationary particle of mass m establishing a contact with it for extremely small time T.  Their force of contact increases from zero to F0 linearly in time  T/4, remains constant for a further   T/2  time and decreases linearly from F0 to zero in further time  T/4  as shown. The magnitude possessed by F0 is

(a)        mu/T (b)         2mu/T (c)         4mu/3T (d)         ...

23. Two masses m1 and m2 (m1 > m2) are connected by massless flexible and inextensible string passed over massless and frictionless pulley. The acceleration of centre of mass is

(a)     (m1 – m2  /  m1 + m2  ) 2  g (b) m1 – m2  / m1 + m2     g...

19. A light string passing over a smooth light pulley connects two blocks of masses  m 1 and m 2  (vertically). If the acceleration of the system is g/8 then the ratio of the masses is

(a)  8 : 1                                    (b)  9 : 7 (c)   4 : 3                                    (d)  5 : 3 Ans. b (10)

10. A block of mass  m1  rests on a horizontal table. A string tied to the block is passed on a frictionless pulley fixed at the end of the table and to the other end of string is hung another block of mass m 2 . The acceleration of the system is on a frictionless pulley fixed at the end of the table and to the other end of string is hung another block of mass . The acceleration of the system is

(a)  m 2  g / (m1 + m 2 ) (b) m1 g / (m1 + m 2 )    (c)  ...

11. A 2 kg block is lying on a smooth table which is connected by a body of mass 1 kg by a string which passes through a pulley. The 1 kg mass is hanging vertically. The acceleration of block and tension in the string will be

(a) 3.27 m/s ^ 2 , 6.54 N (b) 4.38,m/s ^ 2 , 6.54 N (c) 3.27 m/s ^ 2 ...

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