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Shilpa

HomeAuthor: ShilpaPage 22

Two particles of equal mass go round a circle of radius R under the action of their mutual gravitational attraction. The speed of each particle is

(a)       v = 1/2R √1/gm                (b)    v =√gm /2R (c) ...

9. Assertion : The slope of momentum versus time curve give us the acceleration. Reason : Acceleration is given by the rate of change of momentum

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

8. Assertion : Mass is a measure of inertia of the body in linear motion. Reason : Greater the mass, greater is the force required to change its state of rest or of uniform motion.

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

7. Assertion : No force is required by the body to remain in any state. Reason : In uniform linear motion, acceleration has a finite value.

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

6. Assertion : Aeroplanes always fly at low altitudes. Reason : According to Newton’s third law of motion, for every action there is an equal and opposite reaction.

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

5. Assertion : If two objects of different masses have same momentum, the lighter body possess greater velocity. Reason : For all bodies momentum always remains same.

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

4. Assertion : Force is required to move a body uniformly along a circle. Reason : When the motion is uniform, acceleration is zero.

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

1. Assertion : Inertia is the property by virtue of which the body is unable to change by itself the state of rest only. Reason : The bodies do not change their state unless acted upon by an unbalanced external force.

Read the assertion and reason carefully to mark the correct option out of the options given below: (a)        If both...

2. Assertion : If the net external force on the body is zero, then its acceleration is zero. Reason : Acceleration does not depend on force.

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

3. Assertion : Newton’s second law of motion gives the measurement of force. Reason : According to Newton’s second law of motion, force is directly proportional to the rate of change of momentum.

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

The gravitational force between two stones of mass 1 kg each separated by a distance of 1 metre in vacuum is

(a)      Zero                   (b)  6.675×10-5  newton (c)   6.675×10-11  newton      (d)   6.675×10-8...

7. Which of the following is the evidence to show that there must be a force acting on earth and directed towards the sun

(a)      Deviation of the falling bodies towards east (b)  Revolution of the earth round the sun (c)   Phenomenon of day...

The atmosphere is held to the earth by

(a)      Winds                                        (b)  Gravity (c)   Clouds                                (d)  None of the above Answer:  b (10)

A satellite of the earth is revolving in a circular orbit with a uniform speed v. If the gravitational force suddenly disappears, the satellite will

(a)      Continue to move with velocity v along the original orbit (b)  Move with a velocity v, tangentially to the...

11. Figures I, II, III and IV depict variation of force with time

Ans. c (13)

6. If the distance between two masses is doubled, the gravitational attraction between them

(a)      Is doubled                                 (b)  Becomes four times (c)   Is reduced to half              (d)  Is reduced to a quarter Answer: d...

10. The variation of momentum with time of one of the body in a two body collision is shown in fig. The instantaneous force is maximum corresponding to point

(a)       P (b)   Q (c)   R (d)      S Ans. c (13)

The weight of a body at the centre of the earth is

(a)      Zero (b)  Infinite (c)   Same as on the surface of earth (d)  None of the above Answer: a (7)

If there were a smaller gravitational effect, which of the following forces do you think would alter in some respect

(a)      Viscous forces                           (b)  Archimedes uplift (c)   Electrostatic force            (d)  None of the above Answer:  b (8)

The tidal waves in the sea are primarily due to

(a)      The gravitational effect of the moon on the earth (b)  The gravitational effect of the sun on the earth...

9. A body of mass 3kg is acted on by a force which varies as shown in the graph below. The momentum acquired is given by

(a)       Zero (b)   5 N-s (c)   30 N-s (d)   50 N-s Ans. d               ...

8. A particle of mass m, initially at rest, is acted upon by a variable force F for a brief interval of time T. It begins to move with a velocity u after the force stops acting. F is shown in the graph as a function of time. The curve is a semicircle.

Ans. c (52)

6. Which of the following graph depicts spring constant k versus length l of the spring correctly

Ans.  d (6)

7. A particle of mass m moving with velocity u makes an elastic one dimensional collision with a stationary particle of mass m. They are in contact for a very short time T. Their force of interaction increases from zero to F0 linearly in time T/2, and decreases linearly to zero in further time T/2. The magnitude of F0 is

(a)      mu/T (b)  2mu / T (c)   mu/ 2T (d)   None of these ANS. b (6)

Assertion : Soft steel can be made red hot by continued hammering on it, but hard steel cannot. Reason : Energy transfer in case of soft iron is large as in hard steel.

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

5. A body of 2 kg has an initial speed 5ms–1. A force acts on it for some time in the direction of motion. The force time graph is shown in figure. The final speed of the body.

Ans. c (10)

Assertion : Mountain roads rarely go straight up the slope. Reason : Slope of mountains are large therefore more chances of vehicle to slip from roads.

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

4. Figure shows the displacement of a particle going along the X-axis as a function of time. The force acting on the particle is zero in the region

(a)  AB (b)   BC (c)   CD (d)   DE ANS. a, c (23)

Assertion : A work done in moving a body over a closed loop is zero for every force in nature. Reason : Work done does not depend on nature of force.

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

Assertion : Power of machine gun is determined by both, the number of bullet fired per second and kinetic energy of bullets. Reason : Power of any machine is defined as work done (by it) per unit time.

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

3. The force-time (F – t) curve of a particle executing linear motion is as shown in the figure. The momentum acquired by the particle in time interval from zero to 8 second will be

Ans. d (18)

Assertion : In case of bullet fired from gun, the ratio of kinetic energy of gun and bullet is equal to ratio of mass of bullet and gun. Reason : In firing, momentum is conserved.

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

2. In the figure given below, the position-time graph of a particle of mass 0.1 Kg is shown. The impulse at is

Ans. b (7)

Assertion : If two protons are brought near one another, the potential energy of the system will increase. Reason                    :   The charge on the proton is .+1.6×10-19C

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

A particle which is constrained to move along the x-axis, is subjected to a force in the same direction which varies with the distance x of the particle from the origin as  F(x)= -kx+ax3 . Here k and a are positive constants. For  x ≥ 0 , the functional from of the potential energy U(x)  of the particle is

Answer:d   (17)

Assertion : Mass and energy are not conserved separately, but are conserved as a single entity called mass-energy. Reason : Mass and energy conservation can be obtained by Einstein equation for energy.

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

23. Assertion : Heavy water is used as moderator in nuclear reactor. Reason : Water cool down the fast neutron.

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

Assertion : Graph between potential energy of a spring versus the extension or compression of the spring is a straight line. Reason : Potential energy of a stretched or compressed spring, proportional to square of extension or compression.

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

Assertion : Wire through which current flows gets heated. Reason : When current is drawn from a cell, chemical energy is converted into heat energy.

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

20. Assertion : Work done by or against gravitational force in moving a body from one point to another is independent of the actual path followed between the two points. Reason : Gravitational forces are conservative forces.

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

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