# PSEB Class 7 Science Chapter 13 Motion and Time Solution

##  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 ……………… .

(ii) A clock is used to measure …………………. .

(iii) The distance-time graph for uniform speed is a ………………. 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)

(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.

(iii) Simple pendulum is an example of ……………….. motion.

(a) Rectilinear motion

(b) Oscillatory motion

(c) Periodic motion

(d) Rotational 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

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