CBSE Class 7 Science – MCQ and Online Tests – Unit 13 – Motion and Time
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CBSE Class 7 Science – MCQ and Online Tests – Unit 13 – Motion and Time
Choose the correct answer:
Question 1.
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
Answer: (b) length
Question 2.
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
Answer: (d) 5 s/m
Question 3.
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 4.
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
Answer: (a) A to B and back to A
Question 5.
Nearly all the clocks make use of
(a) straight line motion
(b) periodic motion
(c) random motion
(d) circular motion
Answer
Answer: (b) periodic motion
Question 6.
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
Answer: (a) 2.1 s
Question 7.
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
Answer: (b) 7.2
Question 8.
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
Answer: (b) 10 m/s
Question 9.
On which axis is dependent variable represented?
(a) x-axis
(b) y-axis
(c) On any axis
(d) Depends on the data
Answer
Answer: (b) y-axis
Question 10.
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
Answer: (d) Blinking of eyes
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