7th Science Refresher Course Unit 1 Force and Motion - Answer key 2021 -2022 - English Medium
7th Science Refresher Course Unit 1 விசையும் இயக்கமும் Answer key 2021 -2022 -Tamil Medium Click HERE
EVALUATION
I. Choose the Correct Answer :
1. Unit of speed is ___________________ .
(a) m
(b) s
(c) m/s
(d) kg
2. The earth rotates from _________________.
(a) East to west
(b) West to east
(c) South to north
(d) North to south
3. Revolution of moon around the earth is __________________.
(a) Oscillatory Motion
(b) Curvilinear Motion
(c) Periodic Motion
(d) Rotatory Motion
II. Complete the Analogy:
4. Kicking a ball : Contact force
Falling of leaf : _____________ Answer : Gravitation
5. Rotatory Motion : A spinning top
Oscillatory Motion : _____________ Answer : The oscillation of the individual pendulum
6. Distance : Metre
Speed : _____________ Answer : m/s
III. Fill Ups:
7. Gravitational force is a ______________________ force.
Answer :
8. A vehicle moving on a straight road is an example of _________________ motion.
Answer :
9. People walking in a crowded street _________________ motion.
Answer :
10. Motion of the potter’s wheel is an example for ________________ motion.
Answer :
IV. Write True or False:
11. SI Unit of distance is kilometer.
Answer : false
12. A child playing in a swing is periodic motion.
Answer : true
13. Vehicles moving with varying speeds are said to be in uniform motion.
Answer : false
14. Flapping of elephant’s ears is oscillatory motion.
Answer : true
V. Match the Following :
15. The tip of hands of a clock - Non periodic motion
16. The motion of a train - Circular motion
17. Flapping of a flag in wind - Periodic motion
18. Movement of needle in a sewing machine - Rotatory motion
19. Movement of the wheel - Oscillatory motion
20. Swinging of a pendulum - Uniform motion
Answer :
15. The tip of hands of a clock - Circular motion
16. The motion of a train - Uniform motion
17. Flapping of a flag in wind - Non periodic motion
18. Movement of needle in a sewing machine - Periodic motion
19. Movement of the wheel - Rotatory motion
20. Swinging of a pendulum - Oscillatory motion