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

Published on: 31/10/2025

Question Set A

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

3 x 3 = 9

The odometer of a car reads 57321 km when the clock shows the time 08:30 AM. What is the distance moved by the car, if at 08:50 AM, the odometer reading has changed to 57336 km? Calculate the speed of the car in km/min during this time. Express the speed in km/h also.

The distance between two stations is 240 km. A train takes 4 h to cover this distance. Calculate the speed of the train.

A simple pendulum takes 32 s to complete 20 oscillations. What is the time period of the pendulum?

Multiple Choice Question

5 x 1 = 5

The distance moved by the vehicle is measured by

(a)

Odometer

(b)

Galvanometer

(c)

Speedometer

(d)

Thermometer

One millionth second is

(a)

Microsecond

(b)

Nanosecond

(c)

Picosecond

(d)

None of these

Which of the following cannot be used for the measurement of time?

(a)

A leaking tap

(b)

Simple pendulum

(c)

Shadow of an object during the day

(d)

Blinking of eyes

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

The basic unit of speed is

(a)

km/min

(b)

m/min

(c)

km/h

(d)

m/s

Generic 2

6 x 2 = 12

(a) What are nanosecond and microsecond?
(b) Change 30 km/h into m/s.

10.

(a) Which of the two vehicles A and B is moving faster?

(b) Which of the vehicle is moving with a constant speed ?

11.

Name the different types of graphs.

12.

Explain how time was measured when pendulum clocks were not available.

13.

Estimate that how many hours are there in a year.

14.

Name the axis that represents dependent variable.

Generic 5

3 x 5 = 15

15.

Describe simple pendulum with diagram.

16.

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

17.

Given below as a figure is the distance-time graph of the motion of an
(a) What will be the position of the object at 20 s?
(b) What will be the distance travelled by the object in 12 s?
(c) What is the average speed ofthe object?

Fill up / 1 Marks

5 x 1 = 5

18.

_________motion is used in clocks

19.

The standard unit of time is___________

20.

____________is used for measuring speed.

21.

Time period of a pendulum depends on its_____________.

22.

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

True or False

5 x 1 = 5

23.

The symbols of all units are written in singular.

(a)

False

(b)

True

24.

The basic unit of speed is km/h.

(a)

True

(b)

False

25.

The time period of simple pendulum is not constant.

(a)

False

(b)

True

26.

The smallest time interval that can be measured with commonly available clocks and watches is one second.

(a)

False

(b)

True

27.

The motion of a spinning top is rotational motion.

(a)

False

(b)

True

Match the following

5 x 1 = 5

28.

Pendulum

29.

Sand Clock

30.

Speedometer

31.

Days

32.

Years

1 Marks

5 x 1 = 5

33.

A simple pendulum takes 45 see to complete 30 oscillations. What is the time period of the pendulum ?

34.

What is the principle on which most of the clocks works ?

35.

What is the time period of a simple pendulum?

36.

Name some ancient clocks used by our ancestors

37.

What are S.I units of time and speed?

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Answers Key:

Generic 3

3 x 3 = 9

As, we know that
\(Speed=\frac{Distance\ covered}{Time\ taken}\)
Given, distance covered = 57336 - 57321=15km
Time taken = 8: 50 AM- 8: 30 AM= 20min
\(Speed=\frac{15}{20}=\frac{3}{4}km/min\)
Now, speed in km/h is given by \(\frac{3}{4}\times60\)
= 45 km/h \([1min=\frac{1}{60}h]\)

As, we know that the speed of a body is given by \(Speed=\frac{Distance\ travelled}{time\ taken}=\frac{240}{4}=60km/h\)

Time period of simple pendulum is given by
\(\frac{Time\ taken}{Number\ of\ oscillations}=\frac{32}{20}s=1.65\)
(i.e. the time to complete one cycle)

Multiple Choice Question

5 x 1 = 5

(a)
Odometer

(a)
Microsecond

(d)
Blinking of eyes

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

(d)
m/s

Generic 2

6 x 2 = 12

(a) 1 microsecond = 10^-6see.
1 nanosecond = 10^-9sec
(b) 30 km in 1 hour
30 x 1000m in 1 x 60 x 60 seconds
= \(\frac { 30\times 100 }{ 60\times 60 } \) = 8.33ms^-1

10.

(a) A is faster, being higher slope.
(b) A is moving with a constant speed.

11.

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

12.

Before the discovery of pendulum clocks, sundials, water clocks and sand clocks were used.

13.

In a year, we have 365 days and 1 day = 24 h So, for 365 days, we have 24 \(\times\) 365 h = 8760 h

14.

y-axis represents the dependent variable.

Generic 5

3 x 5 = 15

15.

16.

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

Since, one of the scales will be
Distance 5 km = 1 cm and Time 6 min = 1 cm

17.

(a) From the graph, it is clear that the distance at 20 s is 8 m.
(b) Distance travelled by the body object in 12 s is 6 m.
(c) \(Average\ speed=\frac{Total\ distance}{Total\ time}=\frac{8}{20}=0.4m/s\)

Fill up / 1 Marks

5 x 1 = 5

18.