CBSE Class 9 Science Describing Motion Around Us (Class 9 NCERT New) Quiz 9

1. Which of the following can sometimes be ‘zero’ for a moving body?i. Average velocityii. Distance travellediii. Average speed iv. Displacement

A (a) Only (i) B (b) (i) and (ii) C (c) (i) and (iv) D (d) Only (iv)

2. . Which of the following statement is correct regarding velocity and speed of a moving body?

A (a) Velocity of a moving body is always higher than its speed B (b) Speed of a moving body is always higher than its velocity C (c) Speed of a moving body is its velocity in a given direction D (d) Velocity of a moving body is its speed in a given direction

3. A car of mass 1000 kg is moving with a velocity of 10 m/s. If the velocity-time graph for this car is a horizontal line parallel to the time axis, then the velocity of the car at the end of 25 s will be:

A (a) 40 m/s B (b) 25 m/s C (c) 10 m/s D (d) 250 m/s

4. Acceleration is a vector quantity, which indicates that its value

A (a) Is always negative B (b) Is always positive C (c) Is zero D (d) Can be positive, negative or zero

5. The average velocity of a body is given by the expression :

A (a) V= u+ at B (b) 2as= v2− u2 C (c) Vav=(u + v)/2 D (d) S= ut + ½ a t2

6. Distance covered by a body from velocity-time graph is

A (a) Is denoted by a line parallel to the distance axis at any point on the time axis B (b) Is denoted by a line parallel to the time axis at any point on the distance axis C (c) Equal to the slope of the graph D (d) Area under the graph

7. An example of a body moving with constant speed but still accelerating is

A (a) A body moving with constant speed on a straight road B (b) A body moving in a helical path with constant speed C (c) A body moving with constant speed in a circular path D (d) A body moving with constant speed on a straight railway track

8. The S.I. unit of force is

A Kgm/s B Kgm/s2 C Newton D Newton-meter

9. What do we get by the product of mass and velocity?

A Force B Inertia C Momentum D Newton

10. What does the slope of distance - time graph give?

A (a) Acceleration B (b) Uniform speed C (c) Speed D (d) both[b] and [c] depending upon the time of graph