Science class 9 Motion Test

Question 1. A worker covers a distance of 40 km from his house to his place of work, and 10 km towards his house back. Then the displacement covered by the worker in the whole trip is

• (a) zero km

• (b) 10 km

• (c) 30 km

• (d) 50 km

Question 2. Rate of change of displacement with respect to time is called

• (a) Speed

• (b) Deceleration

• (c) Acceleration

• (d) Velocity

Tags

NGSS.HS-PS2-1

Question 3. A player moves along the boundary of a square ground of side 50 m in 200 sec.The magnitude of displacement of the farmer at the end of 11 minutes 40 seconds from his initial position is

• (a) 50 m

• (b) 150 m

• (c) 200 m

• (d) 50√2 m

Question 4. The average velocity of a body is given by the expression :

• (a) V= u+ at

• (b) 2as= v²− u²

• (c) V_av=(u + v)/2

• (d) S= ut + ½ a t²

Question 5. Acceleration is a vector quantity, which indicates that its value

• (a) Is always negative

• (b) Is always positive

• (c) Is zero

• (d) Can be positive, negative or zero

Question 6. An object travels 40m in 5 sec and then another 80m in 5 sec. What is the average speed of the object?

• (a) 12 m/s

• (b) 6 m/s

• (c) 2 m/s

• (d) 0 m/s

Question 7. SI Unit of measurement of acceleration is

• (a) m/s

• (b) m/s²

• (c) m/hr

• (d) M

Question 8. If the displacement of an object is proportional to square of time, then the object moves with:

• (a) Uniform velocity

• (b) Uniform acceleration

• (c) Increasing acceleration

• (d) Decreasing acceleration

Question 9. Which of the following can sometimes be ‘zero’ for a moving body?

i. Average velocity

ii. Distance travelled

iii. Average speed

iv. Displacement

• (a) Only (i)

• (b) (i) and (ii)

• (c) (i) and (iv)

• (d) Only (iv)

Question 10. Which of the following statement is correct regarding velocity and speed of a moving body?

• (a) Velocity of a moving body is always higher than its speed

• (b) Speed of a moving body is always higher than its velocity

• (c) Speed of a moving body is its velocity in a given direction

• (d) Velocity of a moving body is its speed in a given direction