#### Force and Motion Model Question Paper

7th Standard

Reg.No. :
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Science

Time : 01:00:00 Hrs
Total Marks : 40
5 x 1 = 5
1. Suppose a boy is enjoying a ride on a marry go round which is moving with a constant speed of 10 m/s. It implies that the boy

(a)

at rest

(b)

moving with no acceleration

(c)

in accelerated motion

(d)

moving with uniform velocity

2. What is one way you might increase the stability of an object?

(a)

lower the centre of gravity

(b)

raise the centre of gravity

(c)

increase the height of the object

(d)

shorten the base of the object

3. The slope of a velocity-time graph gives _______

(a)

velocity

(b)

distance

(c)

displacement

(d)

acceleration

4. If the velocity of a body does not change, then its acceleration is ____________

(a)

infinity

(b)

unity

(c)

zero

(d)

between zero and unity

5. If the distance travelled by a car is direct proportional to the duration of time. The car will travel with __________

(a)

uniform speed

(b)

non-uniform acceleration

(c)

uniform acceleration

(d)

uniform velocity

6. 5 x 2 = 10
7. All objects having uniform speed need not have uniform velocity. Describe with the help of examples.

8. “She moves at a constant speed in a constant direction”. Rephrase the same sentence in fewer words using concepts related to motion.

9. Correct your friend who says “The acceleration gives the idea of how fast the position changes”.

10. What are three types of stability of an object?

11. Mention any two conditions for stability of a body?

12. 5 x 3 = 15
13. What do you mean by constant acceleration?

14. What is centre of gravity ?

15. Define velocity Mention its formula and unit.

16. What is uniform velocity? Give one example.

17. Define acceleration. Mention its formula and unit.

18. 2 x 5 = 10
19. Explain the types of stability with suitable examples.

20. Write the differences between distance and displacement