Physics Chapter 1 Entry test MCQs
26. A particle is moving in a straight line with uniform acceleration. which graph represents the motion of the particle.
27. In the Following Graph, Distance travelled by the body in meters is.
a. 200
b. 300
c. 250
d. 400
28. Displacement time graph of a ball thrown vertically upward is shown in figure
which of the following v-t graph?
29. If the slope of a velocity time graph gradually decreases, then the body is said to be moving with
a. Uniform velocity
b. Positive acceleration
c. Negative acceleration
d. None of these
30. If the force acting on a body is doubled, then acceleration becomes
a. One fourth
b. Half
c. Constant
d. Doubled
31. When force of 1 N is applied on a body of mass 100 g then the acceleration would be
a. 10 ms-²
b. 5 ms-²
c. 0.1 ms-²
d. 0.5 ms-²
32. A mass of 10 kg moves with an acceleration of 10 ms-², the force on it is
a. 50 N
b. 5N
c. 25 N
d. 100 N
33. Which law of motion defines force?
a. 3rd law
b. 1st law
c. 2nd law
d. All of these
34. A Force of 12 N gives an object an acceleration of 4m/s². The force required to give it an acceleration of 10ms-² is
a. 20 N
b. 15 N
c. 30 N
d. 25 N
35. A balloon is acted upon by three forces, weight, upthrust and sideway force due to the wind, as shown in the diagram What is the vertical component of the resultant force on the balloon?
What is the vertical component of resultant force on the balloon?
a. 10000 N
b. 500 N
c. 10500 N
d. 1000 N
36. When a force of 4 N acts on a mass of 2 kg for a time of 2 sec, what is the rate of change of momentum?
a. 8kgms-²
b. 2kgms-²
c. 16kgms-²
d. 4kgms-²
37. Two equal masses travel towards each other on a frictionless air track at speeds of 60 cms-1 and 30 cms-1 They stick together on impact.
what is the speed of masses after impact
a. 15 cms-1
b. 30 cms-1
c. 20 cms-1
d. 45 cms-1
38. Which is a statement of the principle of conservation of momentum?
a. In a perfectly elastic collision, the relative momentum of the bodies before impact is equal to their relative momentum after impact
b. A force is equal to the rate of change of momentum of the body upon which it acts.
c. The total momentum of a system of interacting bodies remains constants, providing no external force acts
d. The momentum of a body is the product of the mass of the body and its velocity
39. The average force necessary to stop a hammer with 25 N s momentum in 0.05 s expressed in ‘N’ is
a. 50
b. 500
c. 25
d. 125
40. In which of the following cases forces may not be required to keep the
a. Particle going along a straight-line
b. Particle going in a circle
c. Acceleration of the particle constant
d. The momentum of the particle constant
41. A force of 6 N acts on a mass of 1kg which acquire velocity of 30ms-1. The time for which the force acts is
a. 5s
b. 26s
c. 2s
d. 6s
42. A force of 100 Dynes acts on mass of 5g for 10 sec. The velocity produced is
a. 20 cm/sec
b. 2 cm/sec
c. 2000 cm/sec
d. 200 cm/sec
43. The Graph shows how the force acting on a body varies with time. Assuming that the body is moving in a straight line, by how much does it momentum change?
a. 40 kgms-1
b. 36 kgms-1
c. 20 kgms-1
d. 16 kgms-1
44. A gun after firing recoils due to
a. Backward thrust of gases produced
b. Conservation of energy
c. Newton’s first law of motion
d. Conservation of momentum
45. A player takes 0.1 s in catching a ball of mass 150 g moving with velocity of 20 m/s. The force imparted by the ball on the hands of the player is:
a. 300N
b. 0.3 N
c. 30 N
d. 3 N
46. A ball of mass two kg travelling at 8ms-1 strikes a ball of mass 4kg travelling at 2ms-1 . both balls are moving along the same straight line as shown.
After collision both balls moves at the same velocity v. What is the magnitude of the velocity v?
a. 4 ms-1
b. 6 ms-1
c. 5 ms-1
d. 8 ms-1
47. Two similar spheres, each of mass m and travelling with speed v, are moving towards each other.
The spheres have a head on elastic collision. Which statement is correct?
a. The total kinetic energy after impact is mv2
b. The spheres stick together on impact
c. The total momentum before impact is 2 mv
d. The total kinetic energy before impact is zero
48. Two railway trucks of masses m and 3m move towards each other in opposite directions with speeds 2v and v respectively. These trucks collide and stick together. What is the speed of the trucks after the collision?
a. V/2
b. V/4
c. 5v/4
d. v
49. The collision between the two bodies is elastic if bodies are?
a. Hard and elastic
b. Solid and soft
c. Soft and elastic
d. Solid and hard
50. When a very heavy ball ‘B1’ collide with a stationary target ‘B2’ of negligible mass, after collision the final velocity of ball ‘ B2’ will
a. Become doubled as compared to B1
b. Become zero
c. Same as the B1
d. Become half