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#### Force and Motion One Mark Questions

7th Standard EM

Reg.No. :
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Science

Time : 00:30:00 Hrs
Total Marks : 15
5 x 1 = 5
1. A particle is moving in a circular path of radius r. The displacement after half a circle would be

(a)

Zero

(b)

R

(c)

2 r

(d)

r / 2

2. 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

3. 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

4. Distance travelled by a body in a given time

(a)

is always positive

(b)

can be zero or positive

(c)

is always negative

(d)

either (a) or (c)

5. Which of the following is correct

(a)

magnitude of displacement may be greater than distance

(b)

Distance is always greater than or equal to the magnitude of displacement.

(c)

Distance is always greater than the magnitude of displacement.

(d)

Both are scalar quantities.

6. 5 x 1 = 5
7. If the velocity of an object increases with respect to time, then the object is said to be in__________ acceleration.

()

positive

8. The slope of the speed–time graph gives _____

()

velocity

9. In ___________ equilibrium its centre of gravity remains at the same height when it is displaced.

()

neutral

10. The SI unit of displacement is _____________

()

metre (m)

11. The SI unit of speed is ___________

()

m/s

12. 5 x 1 = 5
13. Speed of ship

14. (1)

Equal distances covered in equal intervals of time

15. Centre of gravity of the geometrical shaped object

16. (2)

Knot

17. Stability

18. (3)

Larger base area

19. Uniform motion.

20. (4)

Unequal distance covered in equal interval of time

21. Non-uniform motion

22. (5)

Geometric centre