Motion and Force

1

Which one of the following is an example of the force of gravity of the earth acting on a vibrating pendulum bob?

  1. Applied force
  2. Frictional force
  3. Restoring force
  4. Virtual force
2

Which one of the following has maximum inertia?

  1. An atom
  2. A molecule
  3. A one-rupee coin
  4. A cricket ball
3

An object is moving, with uniform acceleration a. Its initial velocity is u and after time t its velocity is v. The equation of its motion is v = u + at. The velocity (along y-axis) time (along x-axis) graph shall be a straight line

  1. passing through origin
  2. with x-intercept u
  3. with y-intercept u
  4. with slope u
4

If an object moves with constant velocity then which one of the following statements is not correct?

  1. Its motion is along a straight line
  2. Its speed changes with time
  3. Its acceleration is zero
  4. Its displacement increases linearly with time
5

If T is the time period of an oscillating pendulum, which one the following statements is not correct?

  1. The motion repeats after time T only once
  2. T is the least time after which motion repeats itself
  3. The motion repeats itself after nT, where n is a positive integer
  4. T remains the same only for small angular displacements
6

If the motion of an object is represented by a straight line parallel to the time axis in a distance-time graph, then the object undergoes

  1. decelerated motion
  2. uniform non-zero velocity motion
  3. accelerated motion
  4. zero velocity motion
7

A force applied on a body is represented as

F = 6i - 8j + 10k

and accelerates is at 1 m/s2. The mass of the body is

  1. 10√2 kg
  2. 2√10 kg
  3. 8 kg
  4. 10 kg
8

A passenger in a moving train tosses a coin upward which falls behind him. It implies that the motion of the train is

  1. uniform
  2. retarded
  3. accelerated
  4. along the circular tracks
9

A motor vehicle is moving on a circle with uniform speed. The net acceleration of the vehicle is

  1. perpendicular to the radius and along the velocity
  2. towards the centre of circle
  3. away from the centre along the radius of the circle
  4. zero
10

If the distance S covered by a moving car in rectilinear motion with a speed v in time t is given by S = vt, then the car undergoes

  1. uniform velocity
  2. uniform acceleration
  3. non-uniform acceleration
  4. non-uniform velocity
11

A bullet is fired vertically up from a 400 m tall tower with a speed 80 m/s. If g is taken as 10 m/s2, the time taken by the bullet to reach the ground will be

  1. 24 s
  2. 20 s
  3. 16 s
  4. 8 s
12

Newton's law of motion cannot be applicable to the particles moving at a speed comparable to the speed of

  1. light
  2. sound
  3. rocket
  4. bullet train
13

Automobiles are fitted with a device that shows the distance travelled. Such a device is known as

  1. Speedometer
  2. Cathetometer
  3. Odometer
  4. Lactometer
14

The speed of a car travelling on a straight road is listed below at successive intervals of 1 s:
Time (s)        0 1 2 3 4
Speed (m/s)  0 2 4 6 8

Which of the following is/are correct?

The car travels

  1. with a uniform acceleration of 2 m/s2.
  2. 16 m in 4 s.
  3. with an average speed of 4 m/s.

Select the correct answer using the code given below:

  1. 1, 2 and 3
  2. 2 and 3 only
  3. 1 and 2 only
  4. 1 only
15

In a vacuum, a five-rupee coin, a feather of a sparrow bird and a mango are dropped simultaneously from the same height. The time taken by them to reach the bottom is t1, t2 and t3 respectively. In this situation, we will observe that

  1. t1 > t2 > t3
  2. t1 > t3 > t2
  3. t3 > t1 > t2
  4. t1 = t2 = t3
16

An object moves in a circular path with a constant speed. Which one of the following statements is correct?

  1. The centripetal acceleration of the object is smaller for a gentle curve (i.e., curve of larger radius) than that for a sharp curve (i.e., curve of smaller radius).
  2. The centripetal acceleration is greater for a gentle curve than that for a sharp curve.
  3. The centripetal acceleration is the same for both, the gentle and sharp curves.
  4. The centripetal acceleration causes the object to slow down.
17

Rocket works on the principle of conservation of

  1. mass
  2. energy
  3. momentum
  4. velocity
18

An object of mass 2 kg is sliding with a constant velocity of 4 m s–1 on a frictionless horizontal table. The force required to keep the object moving with the same velocity is

  1. 32 N
  2. 0 N
  3. 2 N
  4. 8 N
19

A passenger in a moving train tosses a coin which falls behind him. It means that motion of the train is

  1. accelerated
  2. uniform
  3. retarded
  4. along circular tracks
20

The inertia of an object tends to cause the object

  1. to increase its speed
  2. to decrease its speed
  3. to resist any change in its state of motion
  4. to decelerate due to friction
21

A goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. This enables the goal keeper to

  1. exert larger force on the ball
  2. reduce the force exerted by the ball on hands
  3. increase the rate of change of momentum
  4. decrease the rate of change of momentum
22

Slope of a velocity – time graph gives

  1. the distance
  2. the displacement
  3. the acceleration
  4. the speed
23

Which of the following figures represents uniform motion of a moving object correctly?

24

Suppose a boy is enjoying a ride on a merry-go-round which is moving with a constant speed of 10 m s–1. It implies that the boy is

  1. at rest
  2. moving with no acceleration
  3. in accelerated motion
  4. moving with uniform velocity
25

From the given v – t graph, it can be inferred that the object is

 

  1. in uniform motion
  2. at rest
  3. in non-uniform motion
  4. moving with uniform acceleration
26

If the displacement of an object is proportional to square of time, then the object moves with

  1. uniform velocity
  2. uniform acceleration
  3. increasing acceleration
  4. decreasing acceleration
27

A body is thrown vertically upward with velocity u, the greatest height h to which it will rise is

  1. u/g
  2. u2/2g
  3. u2/g
  4. u/2g
28

To sharpen the blade of a knife by rubbing it against a surface, which of the following will be most suitable?

  1. stone
  2. plastic block
  3. wooden block
  4. glass block
29

During dry weather, while combing hair, sometimes we experience hair flying apart. The force responsible for this is

  1. force of gravity
  2. electrostatic force
  3. force of friction
  4. magnetic force
30

A bus travels 54 km in 90 minutes. The speed of the bus is

  1. 0.6 m/s
  2. 10 m/s
  3. 5.4 m/s
  4. 3.6 m/s