PSEB Punjab Board Class 7 Science Textbook Solution Chapter 13 Motion and Time Exercise Questions and Answers
Q.1 Fill in the blanks:
(i) The motion of an object in a straight line is called ……………… .
Answer: Linear motion.
(ii) A clock is used to measure …………………. .
(iii) The distance-time graph for uniform speed is a ………………. line
Answer: Straight line.
(iv) The motion of a simple pendulum is called ………………….. motion.
Q.2 True or false:
(i) Speed is the distance travelled by an object per unit time.
(ii) The S.I. unit of speed is Km/s.
(iii) The time taken to complete one oscillation of a pendulum is its time period.
(iv) The instrument used to measure the speed of a vehicle is an odometer.
Q.3 Match the column:
1. Periodic Motion – b)
2. Measure Time – c)
3. Measure Speed – d)
4. Slow motion – a)
Q.4 Choose the correct answer.
(i) Which of the following is a Distance-Time Graph for an object at rest ?
Answer: (c) A straight line graph parallel to the horizontal (x-axis) axis.
(ii) Which of the following relations is correct for finding the speed of an object ?
(a) Speed = Distance × Time
(b) Speed = Distance/Time
(c) Speed = Time/Distance
(d) Speed = 1 /Distance × Time.
Answer: (b) Speed = Distance/Time
(iii) Simple pendulum is an example of ……………….. motion.
(a) Rectilinear motion
(b) Oscillatory motion
(c) Periodic motion
(d) Rotational motion.
Answer: (c) Periodic motion
(iv) A car moves with a speed of 40 km/h for 15 minutes and then with speed of 60 km/h for the next 15 minutes. The total distance covered by the car is:
(a) 100 km
(b) 25 km
(c) 15 Km
(d) 10 Km
Answer: (b) 25 km.
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