We have provided Motion and Time Class 7 Extra Questions with Answers to help students understand the concept very well. You can also practice The Adventure Class 11 Extra Questions and Answers on cbsesamplepapers.info.
Motion and Time Class 7 Extra Questions with Answers
Choose the correct answer:
Question 1.
A bus travels 54 km in 90 minutes. The speed of the bus is
(a) 0.6 m/s
(b) 10 m/s
(c) 5.4 m/s
(d) 3.6 m/s
Answer:
(b) 10 m/s
Question 2.
If we denote speed by S, distance by D and time by T, the relationship between these quantities is
(a) S = D T
(b) T = \(\frac { S }{ D }\)
(c) S = \(\frac { 1 }{ T }\) × D
(d) S = \(\frac { T }{ D }\)
Answer
Answer: (c) S = \(\frac { 1 }{ T }\) × D
Question 3.
Observe the figure given below:
The time period of a simple pendulum is the time taken by it to travel from
(a) A to B and back to A
(b) O to A, A to B and B to A
(c) B to A, A to B and B to O
(d) A to B
Answer:
(a) A to B and back to A
Question 4.
Nearly all the clocks make use of
(a) straight line motion
(b) periodic motion
(c) random motion
(d) circular motion
Answer:
(b) periodic motion
Question 5.
A simple pendulum takes 42 sec. to complete 20 oscillations. What is its time period?
(a) 2.1 s
(b) 4.2 s
(c) 21 s
(d) 8.40 s
Answer:
(a) 2.1 s
Question 6.
Time period of a simple pendulum depends upon its
(a) weight of bob
(b) length
(c) both (a) and (b)
(d) None of these
Answer:
(b) length
Question 7.
Which of the following cannot be used for measurement of time?
(a) A leaking tap
(b) Simple pendulum
(c) Shadow of an object during the day
(d) Blinking of eyes
Answer:
(d) Blinking of eyes
Question 8.
On which axis is dependent variable represented?
(a) x-axis
(b) y-axis
(c) On any axis
(d) Depends on the data
Answer:
(b) y-axis
Question 9.
The correct symbol to represent the speed of an object is:
(a) 5 m/s
(b) 5 mp
(c) 5 m/s-1
(d) 5 s/m
Answer:
(d) 5 s/m
Question 10.
Boojho walks to his school which is at a distance of 3 km from his home in 30 minutes. On reaching he finds that the school is closed and comes back by a bicycle with his friend and reaches home in 20 minutes. His average speed in km/h is
(a) 8.3
(b) 7.2
(c) 5
(d) 3.6
Answer:
(b) 7.2
Match the following:
| Column A | Column B |
| (i) Years | (a) Rotation period of earth on its axis |
| (ii) Hour | (b) Time to complete 100 m race |
| (iii) Minute | (c) Gestation period in humans |
| (iv) Days | (d) Age of a person |
| (v) Second | (e) In scientific research |
| (vi) Month | (f) Age of stars |
| (vii) Microseconds | (g) Time to reach your school |
| (h) Train reaches from one city to other |
Answer:
| Column A | Column B |
| (i) Years | (d) Age of a person |
| (ii) Hour | (h) Train reaches from one city to other |
| (iii) Minute | (g) Time to reach your school |
| (iv) Days | (a) Rotation period of earth on its axis |
| (v) Second | (b) Time to complete 100 m race |
| (vi) Month | (c) Gestation period in humans |
| (vii) Microseconds | (e) In scientific research |
Fill in the blanks:
1. The distance covered by an object in a ………………… is called its speed.
Answer:
unit time
2. Time between one sunrise and the next sunrise was called a …………………
Answer:
day
3. In a simple pendulum, the metallic ball suspended by thread is called its …………………
Answer:
bob
4. Time period of a pendulum depends on its …………………
Answer:
length
5. The symbols of all units are written in …………………
Answer:
singular
6. A ………………… is one billionth of a second.
Answer:
nanosecond
7. Motion of objects can be presented in pictorial form by their ………………… graph.
Answer:
distance time
8. The distance-time graph for the motion of an object moving with a constant speed is a …………………
Answer:
straight line
Choose the true and false statements from the following:
1. Faster vehicle has a higher speed.
Answer:
True
2. All the clocks make use of some periodic motion.
Answer:
True
3. The basic unit of speed is km/h.
Answer:
False
4. The symbols of all units are written in singular.
Answer:
True
5. The basic unit of time is second.
Answer:
True
6. Age of a person is expressed in days.
Answer:
False
7. The distance-time graph of standing vehicle is a straight line parallel to x-axis.
Answer:
True
8. Periodic events are used for the measurement of time.
Answer:
True