9th class Physics, Chapter 2: Kinematics MCQs

1. The numerical ratio of displacement to distance is:

1. (A) always less than one
2. (B) always equal to one
3. (C) always greater than one
4. (D) equal to or less than one ✓

2. If a body does not change its position with respect to some fixed point, then it will be in a state of:

1. (A) rest ✓
2. (B) motion
3. (C) uniform motion
4. (D) variable motion

3. A ball is dropped from the top of a tower, the distance covered by it in the first second is:

1. (A) 5 m ✓
2. (B) 10 m
3. (C) 50 m
4. (D) 100 m

4. A body accelerates from rest to a velocity of 144 km h⁻¹ in 20 seconds. The distance covered by it is:

1. (A) 100 m
2. (B) 400 m ✓
3. (C) 1400 m
4. (D) 1440 m

5. A body is moving with constant acceleration starting from rest. It covers a distance S in 4 seconds. How much time does it take to cover one-fourth of this distance?

1. (A) 1 s
2. (B) 2 s ✓
3. (C) 4 s
4. (D) 16 s

6. The displacement time graphs of two objects A and B are shown in the figure (A a straight line sloping upward, B a horizontal line). Point out the true statement from the following:

1. (A) The velocity of A is greater than B. ✓
2. (B) The velocity of A is less than B.
3. (C) The velocity of A is equal to that of B.
4. (D) The graph gives no information in this regard.

7. The area under the speed-time graph is numerically equal to:

1. (A) velocity
2. (B) uniform velocity
3. (C) acceleration
4. (D) distance covered ✓

8. Gradient of the speed-time graph is equal to:

1. (A) speed
2. (B) velocity
3. (C) acceleration ✓
4. (D) distance covered

9. Gradient of the distance-time graph is equal to the:

1. (A) speed ✓
2. (B) velocity
3. (C) distance covered
4. (D) acceleration

10. A car accelerates uniformly from 80.5 km h⁻¹ at t = 0 to 113 km h⁻¹ at t = 9 s. Which speed-time graph best describes the motion of the car?

1. (A) A straight line sloping upward that starts above zero ✓
2. (B) A straight line sloping upward that starts from the origin
3. (C) A curve that bends upward starting from the origin
4. (D) A straight line sloping downward

11. Which of the following is a scalar quantity?

1. (A) Force
2. (B) Speed ✓
3. (C) Velocity
4. (D) Displacement

12. Which of the following is a vector quantity?

1. (A) Energy
2. (B) Acceleration ✓
3. (C) Distance
4. (D) Time

13. A scalar quantity can be described completely by:

1. (A) magnitude only ✓
2. (B) direction only
3. (C) magnitude and direction
4. (D) unit only

14. Scalar quantities can be added:

1. (A) by drawing arrows
2. (B) like ordinary numbers ✓
3. (C) by the head-to-tail rule
4. (D) only graphically

15. Which one of the following is NOT a vector quantity?

1. (A) Velocity
2. (B) Temperature ✓
3. (C) Weight
4. (D) Force

16. The study of motion of objects without referring to the forces is called:

1. (A) thermodynamics
2. (B) kinematics ✓
3. (C) dynamics
4. (D) statics

17. A vector is represented graphically by:

1. (A) a curved line
2. (B) a dot
3. (C) a closed circle
4. (D) a straight line with an arrow head ✓

18. The angle of a vector with the x-axis is measured from the right side of the x-axis in the:

1. (A) clockwise direction
2. (B) direction of the y-axis
3. (C) direction of the vector itself
4. (D) anti-clockwise direction ✓

19. For geographical directions the reference line is:

1. (A) north-south ✓
2. (B) east-west
3. (C) the x-axis
4. (D) the y-axis

20. According to the head-to-tail rule, the resultant vector is directed from:

1. (A) the tail of the first vector to the head of the last vector ✓
2. (B) the head of the first vector to the tail of the last vector
3. (C) the head of the first vector to the head of the last vector
4. (D) the tail of the first vector to the tail of the last vector