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CBSE 7th Standard Science Motion and Time Important Questions And Answers Study Material - QB365 Set D

Published on: 31/10/2025

Question Set D

CBSE 7th Standard Science Motion and Time Important Questions And Answers Study Material - QB365

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Std: 7th Standard CBSE - Science

chapter: Motion and Time - Important Questions And Answers

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Questions:

Generic 3

4 x 3 = 12

Starting from A, Paheli moves along a rectangular path ABCD as shown in figure. She takes 2 min to travel each side. Plot a distance-time graph and explain whether the motion is uniform or non-uniform.

Differentiate between a uniform and non-uniform motion.

Figure shows the distance-time graph for the motion of two vehicles A and B. Which one of them is moving faster?

Classify the following as motion along a straight line, circular or oscillatory motion.
(a) Motion of your hands while running.
(b) Motion of a horse pulling a cart on a straight road.
(c) Motion of a child in a merry-go-round.
(d) Motion of a child on a see-saw.
(e) Motion of the hammer of an electric bell.
(f) Motion of a train on a straight bridge.

Multiple Choice Question

5 x 1 = 5

Boojho walks to his school which is at a distance of 3 km from his home in 30 min. On reaching, he finds that the school is closed and comes back by a bicycle with his friend and reaches home in 20 min. His average speed in km/h is

(a)

8.3

(b)

7.2

(c)

(d)

3.6

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

How will you convert the speed given in km/h to m/s?

(a)

By multiplying with 5/16

(b)

By multiplying with 6/5

(c)

By multiplying with 18/5

(d)

By multiplying with 5/18

What is the relation between distance and speed?

(a)

Distance = Speed \(\times\) Time

(b)

Distance = Speed/Time

(c)

Distance = Time/Speed

(d)

None of the above

Which of the following relations is correct?

(a)

Speed = Distance \(\times\) Time

(b)

\(Speed=\frac{Distance}{Time}\)

(c)

\(Speed=\frac{Time}{Distance}\)

(d)

\(Speed=\frac{1}{Distance\times\ Time}\)

Generic 2

4 x 2 = 8

10.

Name the different types of graphs.

11.

Out of the two given clocks, a pendulum clock or a quartz clock. Mention which of the clock between the given ones requires an electric cell for its working?

12.

If you did not have a clock, how would you decide what time of the day is?

13.

Paheli and Boojho have to cover different distances to reach their school but they take the same time to reach the school. What can you say about their speed?

Generic 5

2 x 5 = 10

14.

Distance between Bholu's and Golu's house is 9 km. Bholu has to attend Golu's birthday party at 7 0' clock. He started his journey from his home at 6 0' clock on his bicycle and covered a distance of 6 km in 40 min. At that point, he met Chintu and he spoke to him for 5 min and reached Golu's birthday party at 7 0' clock. With what speed, did he cover the second part of the journey? Calculate his average speed for the entire journey.

15.

Explain by giving example that how can we choose a suitable scale.

Fill up / 1 Marks

5 x 1 = 5

16.

The unit of speed is ..................

17.

Motion and__________are relative terms

18.

The distance-time graph for the motion of an object moving with a constant speed is a____________.

19.

The symbols of all units are written in_____________

20.

The distance covered by an object in a________________is called its speed.

True or False

5 x 1 = 5

21.

Periodic events are used for the measurement of time.

(a)

False

(b)

True

22.

The basic unit of speed is km/h.

(a)

True

(b)

False

23.

The basic unit of time is second.

(a)

False

(b)

True

24.

Faster vehicle has a higher speed.

(a)

False

(b)

True

25.

The motion of a spinning top is rotational motion.

(a)

False

(b)

True

Match the following

5 x 1 = 5

26.

Movement of object in unit time

27.

Odometer

28.

Speedometer

29.

Microseconds

30.

Second

1 Marks

3 x 1 = 3

31.

How can you define 60 km/hr ?

32.

What is a simple pendulum ?

33.

Define speed

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Answers Key:

Generic 3

4 x 3 = 12

Since, the distance covered per unit time for the entire distance covered is not the same, the motion is a non-uniform motion

When a body travels equal distance in an equal interval of time, then the body is said to be in a uniform motion.
When a body travels unequal distance in an equal interval of time, then the body is said to be in non-uniform motion.

As, from the given graph, slope of A is greater than B, i.e. distance covered by A in same time with respect to B is greater. So, A is moving with faster speed than B.

(a) Oscillatory
(b) Straight line
(c) Circular
(d) Oscillatory
(e) Oscillatory
(f) Straight line

Multiple Choice Question

5 x 1 = 5

(b)
7.2

(a)
5 m/s

(d)
By multiplying with 5/18

(a)
Distance = Speed \(\times\) Time

(b)
\(Speed=\frac{Distance}{Time}\)

Generic 2

4 x 2 = 8

10.

Different types of graphs are
(i) Line graph
(ii) Pie chart
(iii) Bar graph

11.

A quartz clock requires an electric cell for its working.

12.

We can decide time of the day without clock by seeing shadow formed by the sun, e.g. at noon, shadow formed by the sun is shorter than at evening.

13.

They do not have equal speed because they cover unequal distance in equal intervals of time. One of them has higher speed whom has to cover larger distance with respect to other.

Generic 5

2 x 5 = 10

14.

From the question, Bholu covers 3 km distance in 15 min
speed of Bholu \(=\frac{3}{15}\times60=12\ km/h\) \((1\ min=\frac{1}{60}h)\)
Now, average speed is given by
\(=\frac{Total\ distance\ travelled}{Total\ time\ taken}=\frac{9}{1}=9\ km/h\)

15.

While choosing the most suitable scale for drawing a graph, we should keep the following points in mind
(i) The difference between the highest and lowest values of each quantity.
(ii) The intermediate values of each quantity so that with the scale chosen, it is easy to mark the values on the graph.
(iii) To utilise the maximum part of the paper on which the graph is to be drawn, assume that we have a graph paper of size 25 cm \(\times\) 25 cm and we have to accommodate following data:

Tim (AM)	Odometer reading	Distance from the starting point
8:00 AM	36540 km	0 km
8:30 AM	36560 km	20 km
9:00 AM	36580 km	40 km
9:30 AM	36600 km	60 km
10:00 AM	36620 km	80 km