Question Set A

cbse 6th Standard Science Motion & Measurement of Distances Important Questions And Answers Study Material - QB365

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Questions:

Generic 3

5 x 3 = 15

A carpenter is fixing a curtain rod on the wall by tightening a screw. How many different kinds of motions is the screw undergoing?

The photograph given in figure shows a section of a grille made up of straight and curved iron bars. How would you measure the length of the bars of this section so that the payment could be made to the contractor?

Four children measure the length of a table which was about 2 m. Each of them used different ways to measure it.
(a) Shyam measured it with a half metre long thread.
(b) Gurmeet measured it with a 15 cm scale from her geometry box.
(c) Reena measured it using her handspan.
(d) Salim measured it using a 5 m long measuring tape.
Which one of them would get the most accurate length? Give reasons for your answer.

The height of a person is 1.65 m. Express it into cm and mm.

Arrange the following lengths in their increasing magnitude.
1 metre, 1 centimetre, 1 kilometre, 1 millimetre

Generic 2

5 x 2 = 10

How would you decide whether an object is in motion or at rest?

How can we use a string to measure distances less then the length of the string?

Name the type of motion possessed by planet around the sun.

Give the name of the device used to measure girth of a tree.

10.

State whether the hour hand of a wall clock is at rest or in motion.

Fill up / 1 Marks

10 x 1 = 10

11.

What is measurement?

12.

How many mm³ are there in 1 cm³ ?

13.

What is the current system of measurement of length ?

14.

What is straight line motion?

15.

What is motion?

16.

The length of a curved line can be measured by using a___________________

17.

A plucked string of a sitar executes ________________motion.

18.

2000 cm is equal to ________________metre.

19.

Motion of the needle of a sewing machine is ____________________

20.

Five kilometre is ___________m

True or False

5 x 1 = 5

21.

The object which does not change its position time is said to be at rest.

(a)

False

(b)

True

22.

A cloth merchant uses a meter rod to measure the length of the cloth.

(a)

False

(b)

True

23.

A flying bird in the sky is at rest.

(a)

True

(b)

False

24.

An elastic tape cannot give a true measurement.

(a)

False

(b)

True

25.

One metre is equal to 1000 cm.

(a)

True

(b)

False

Multiple Choice Question

10 x 1 = 10

26.

A flying kite's motion in the sky is :

(a)

Linear motion

(b)

Circular motion

(c)

Random motion

(d)

Vibrational motion

27.

An example of rectilinear motion is

(a)

Afree falling apple from tree

(b)

A stone thrown downward with force

(c)

Astone throw horizontally with great force

(d)

None of these

28.

1 metre is equal to :

(a)

10 cm

(b)

10 decimetre

(c)

10 decametre

(d)

None of these

29.

One decametre is equal to

(a)

10cm

(b)

10mm

(c)

10m

(d)

10km

30.

Find the odd one out:

(a)

Rotation of earth about its axis

(b)

Tabla surface

(c)

Blades of rotating fan

(d)

Moving vehicle on straight road

31.

A ball rolling on the ground represents

(a)

rectilinear motion

(b)

rotational motion

(c)

Both (a) and (b)

(d)

None of the above

32.

You are provided three scales A, B and C as shown in figure to measure a length of 10 cm.

For the correct measurement of the length, you will use the scale

(a)

only A

(b)

only B

(c)

only C

(d)

Any of the three scales

33.

Bholu and Golu are playing in a ground. They start running from the same point A in the ground and reach point B at the same time by following the paths marked 1 and 2, respectively as shown in the figure. Which of the following is true for the given situation?

As compared to Golu, Bholu covers a

(a)

longer distance but with a lower speed

(b)

longer distance with a higher speed

(c)

shorter distance with a lower speed

(d)

shorter distance with a higher speed

34.

Which of the following does not express a time interval?

(a)

A day

(b)

A second

(c)

A school period

(d)

Time of the first bell in the school

35.

The distance between Delhi and Mumbai is usually expressed in the unit of

(a)

decametre

(b)

metre

(c)

centimetre

(d)

kilometre

Generic 5

4 x 5 = 20

36.

How can we find the length of a curved line? Explain.

37.

It is not accurate to measure a length with elastic tapes. Explain why.

38.

How are the motions of a wheel of a moving bicycle and a mark on the blade of a moving electric fan different? Explain.

39.

While travelling in a train, it appears that the trees near the track are moving whereas co-passengers appear to be stationary. Explain the reason.

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Answers Key:

Generic 3

5 x 3 = 15

The screw undergoes two kinds of motions, i,e., circular and periodic motions

To measure the length of bars of grille, straight part of iron bar is measured directly with measuring tape and curved part. It first measured with thread, then after measuring tape is used to measure the length of thread.

(d) Shyam will measure it most accurately because of the following reasons
(i) Length 2 m which he want to measure can be measured using this scale only in a single attempt.
(ii) This scale is standard scale and will measure the correct measurements. Other scales given are either non-standard or having the length less than the length we want to measure.

Given, height of a person = 1.65 m
We know that
1 metre (m)= 100 centimetre (cm)
1 metre (m) = 1000 millimetre (mm)
(a) The height of a person in cm = 1.65x 100 cm = 165 cm
(b) The height of a person in mm = 1.65x 1000 mm = 1650 mm

We know that
1 kilometre (km) = 1000 metre (m)
1 metre (m) = 100 centimetre (cm)
1 centimetre (cm) = 10 millimetre (mm)
Hence, increasing order of given units is as follows:
1 millimetre <1 centimetre <1 metre <1 kilometre

Generic 2

5 x 2 = 10

An object is said to be at rest when it does not change its position with time. While an object is said to be in motion when it changes its position with time.

By marking 1/2, 1/4and 1/8 of string length

The motion possessed by the planets around the sun is circular motion.

The device which is used to measure girth of a tree is a measuring tape.

10.

Due to the changing position of hour hand of a wall clock, it always be in motion.

Fill up / 1 Marks

10 x 1 = 10

11.

()
The comparison of an unknown quantity with a standard known quantity is known as measurement.

12.

()
1 cm = 10mm
1 cm³ = 10mm x 10mm x 10mm = 1000mm³.

13.

()
SI system

14.

()
When a body moves in a straight line, it is called rectilinear motion

15.

()
If a body moves from its position, then it is said to be in motion.

16.

()
thread or measuring tape

17.

()
periodic oscillatory

18.

()
20

19.

()
periodic motion

20.

()
5000

True or False

5 x 1 = 5

21.

(a)
False

22.

(a)
False

23.

(b)
False

24.

(a)
False

25.

(b)
False

Multiple Choice Question

10 x 1 = 10

26.

27.

28.

(b)
10 decimetre

29.

30.

(d)
Moving vehicle on straight road

31.

32.

(d)
Any of the three scales

33.

(b)
longer distance with a higher speed

34.

(d)
Time of the first bell in the school

35.

(d)
kilometre

Generic 5

4 x 5 = 20

36.

Draw a curved line CD. Take a thread and make a knot at one of its ends. Keep the knot made in the thread on point C of the line. Place a small portion of the thread along the line, keeping it tight using your fingers and thumb. Keep on stretching the thread on the curved line till you take the thread to the point D of the line. Make a mark on the thread where it touches the other end of the line at point D. Now, stretch the thread along a metre scale and the length between the knot in the beginning and mark on the thread is measured through scale. This measured length on scale will give you the length of the curved line CD.

37.

Elastic tapes are stretchable due to which their length can be increased during the measurement if it is not handle with care. Therefore, the measurement done by elastic tapes may be greater than the actual length of the object. So, we can say that elastic tapes are not accurate to measure a length.

38.

The motions of a wheel of a moving bicycle and a mark on the blade of a moving electric fan are different in the following ways.

S.No.	Wheel of moving bicycle	Work on the blade of electric fan
1	The motion is rotational and circular both.	The motion is circular
2	It changes position while doing circular motion.	It cannot change its position.
3	It can execute rectilinear motion.	It cannot execute rectilinear motion
4	It can cover some distances in any time interval.	It cannot cover any distance.

39.

While travelling, trees near the track same to be moving back (i.e. opposite to the direction of motion of a train) because there is a relative motion between outside trees and moving train. While in case of co-passengers, the relative motion between we and co-passengers, is zero, so it appears to be stationary.

cbse 6th Standard Science Motion & Measurement of Distances Important Questions And Answers Study Material - QB365 Set A

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Std: 6th Standard CBSE - Science

chapter: Motion & Measurement of Distances - Important Questions And Answers

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