CBSE Worksheet-44 Class - VII Science (Motion and Time)
CBSE Worksheet-44 Class - VII Science (Motion and Time)
CBSE Worksheet-44 Class - VII Science (Motion and Time)
Column B
a. Frequency
b. Vibration
c. Time-period
d. Oscillation
e. Frequency
Answer key
1. a
2. a
3. c
4. b
5. (a) (ii), (b) (v), (c) (i), (d) (iii), (e) (i).
6. (a) 1/1000 (b) comparison(c) vibration (d) speed (e) stop-watch.
7. Distance traveled = 540 km
Time taken = 4.5 hrs.
Speed = Distance/ time
= 540 km/4.5 hrs.
= 120 km/hrs.
8. An object is said to be in state of rest if it do not changes its position with time and
surrounding. An object lying on table is at rest.
9. Speed is the change in position of a body per unit time. On the other hand velocity is
the speed with direction. Speed is scalar and velocity is vector quantity.
10. (a) Periodic motion
(b) Frequency
(c) Time-period
(d) Second
(e) Quartz clock.