Measurement of Length and Motion Class 6 Extra Questions and Answers Science Chapter 5

Class 6 Science Chapter 5 Extra Questions Measurement of Length and Motion

Class 6 Science Chapter 5 Measurement of Length and Motion Important Extra Questions and Answers

Measurement of Length and Motion Class 6 Extra Questions Very Short Answer Type

Question 1.
Name the device which can be used for measuring the girth of a tree.
Answer:
Measurement tape.

Measurement of Length and Motion Class 6 Extra Questions and Answers Science Chapter 5

Question 2.
Name the type of motion in which a body moves along a straight path.
Answer:
Rectilinear motion.

Question 3.
Name the unit of length which should be used to express the thickness of a coin.
Answer:
Millimetre (mm).

Question 4.
Arrange the following lengths in their increasing magnitude : 1 metre, 1 centimetre, 1 kilometre, 1 millimetre
Answer:
1 millimetre, 1 centimetre, 1 metre, 1 kilometre.

Measurement of Length and Motion Class 6 Extra Questions and Answers Science Chapter 5

Question 5.
What type of measuring device would you use to measure the width of a tree?
Answer:
Measuring tape.

Question 6.
What type of motion is performed by the wheel of a bicycle ?
Answer:
Rectilinear motion.

Question 7.
What kind of motion is shown by Earth moving about its own axis ?
Answer:
Rotatory motion.

Question 8.
What type of motion is exhibited by a swinging pendulum ?
Answer:
Periodic motion.

Question 9.
A 30 cm scale has a broken end. The mark at the broken end is 1.6 cm . Which work of the scale will you use for measuring the length of an object?
Answer:
2.0 cm mark.

Measurement of Length and Motion Class 6 Extra Questions and Answers Science Chapter 5

Question 10.
What type of motion is exhibited by sprinters in a 100 m race ?
Answer:
Rectilinear motion.

Measurement of Length and Motion Class 6 Extra Questions Short Answer Type

Question 1.
The height of a person is 1.65 m. Express it in cm and mm
Answer:
(i) 1 m = 100 cm
∴  1.65 m =1.65 × 100=165 cm

(ii)  1 m =1000 mm
∴ 1.65 m =1000 × 1.65
= 16550 mm

Question 2.
The distance between Radha’s home and her school is 3250 m . Express this distance in km .
Answer:
1km = 1000m
So, 1000 m =1km
∴ 3259 m = \(\frac{3250 \times 1}{1000}\) = 3.250 km

Measurement of Length and Motion Class 6 Extra Questions and Answers Science Chapter 5

Question 3.
While measuring the length of a knitting needle, the reading of the scale at one end is 3.0 cm and at the other end is 33.1 cm . What is the length of the needle?
Answer:
Length of the needle
=33.1cm – 3.0cm = 30.1cm

Question 4.
Define rectilinear motion. Give one example.
Answer:
Rectilinear motion : The movement of a body along a straight line is called linear motion.
Example: The movement of a bullet fired from a gun is an example of rectilinear motion.

Question 5.
Write the similarities and differences between the motion of a bicycle and a ceiling fan that has been switched on.
Answer:
Similarities: Both the wheel of a bicycle and a ceiling fan exhibit motion on a fixed axis.
Dissimilarities: Bicyclemoves forward, hence execute rectilinear motion but fan does not show such motion.

Question 6.
Give two examples of periodic motion.
Answer:

  • Oscillations of a pendulum.
  • The revolution of earth around the sun.

Question 7.
State two precautions to be observed while measuring length with the help of a metre scale.
Answer:

  • The scale should be placed parallel to the side of the object being measured. It should also be in touch with the object being measured.
  • While reading the scale, the eye must be placed vertically above the scale mark being read.

Measurement of Length and Motion Class 6 Extra Questions and Answers Science Chapter 5

Question 8.
How doyoumeasure the circumference of a one-rupee coin ?
Answer:
To measure the circumference of a coin, wrap the thread around the coin. Now the length of the thread can be measured with the help of a metre scale.

Question 9.
Surender’s house is  4260 metre from his school. Express this distance in kilometre.
Answer:
Distance =4260 m
1km = 1000m
∴ Distance = \(\frac{4260}{1000}\) =4.26 km

Question 10.
The length of a book rack is 2.25 m. Express this length in (i) cm and (ii) mm
Answer:
(i) Length of book rack =2.25 m
1m =100cm
∴ 2.25 m =2.25 × 100=22.5 cm

(ii) Length of book rack =2.25
1 m =1000 mm
∴ 2.25 m = 2.25 × 1000 mm
= 2250 mm

Measurement of Length and Motion Class 6 Extra Questions and Answers Science Chapter 5

Question 11.
(a) How many centimetres are there in a metre ?
(b) How many millimetres are there in a centimetre?
(c) How many metres make one km?
Answer:
(a) 100
(b) 10
(c) 1000

Question 12.
Give a method of measure the thickness of a one rupee coin.
Answer:
Collect ten one rupee coins and stack them as shown in Fig. 14. Measure the height of the staked coins in millimetres. Tick the thickness by 10. You will get the average thickness of one coin.
Measurement of Length and Motion Class 6 Extra Questions and Answers Science Chapter 5.1

Question 13.
Name three factors on which the choice of the measuring device depends.
Answer:
The choice of the measuring device depends on:

  • The size of the object to be measured.
  • The shape of the object to be measured.
  • The degree of accuracy needed.

Question 14.
Give one example of objects for each of the following:
(i) Object which moves in a line.
(ii) Object which moves in a circle.
(iii) Object which has a periodic motion.
Answer:
(i) Light comes from the sun.
(ii) Movement of merry-go-round.
(iii) Motion of earth around the sun in one year.

Measurement of Length and Motion Class 6 Extra Questions and Answers Science Chapter 5

Question 15.
Give three examples of non-periodic motion.
Answer:

  • A football player running in the field is performing non-periodic motion because sometimes he runs fast and sometimes slowly.
  • When the brakes are applied to a moving vehicle, the motion described by the wheels is non-periodic.
  • A cricket ball rolling down the ground gradually shows down and finally stops and therefore, is performing non-periodic motion.

Question 16.
Usually an object shows more than one kind of motion at the same time. Explain giving examples.
Answer:
The wheels of a sewing machine rotate (Rotational motion), while the needle moves up and down. The motion of both the wheel as well as needle is periodic in nature. Similarly, in wheels of a car moving on a straight path, there is a combination of different types of motion. They exhibit both rotational and rectilinear motion.

Question 17.
Name the three types of motion exhibited by the earth.
Answer:

  • The march-past of soldiers in a parade.
  • The movement of all the planets around the sun.
  • The spinning of earth on its axis.

Question 18.
Why do we need standard unit for measurement?
Answer:
We need standard unit of measurement to take our judgement more reliable and accurate. For proper dealinbg, measure points should be same for every body. ‘There should be a uniformity in measurement. For uniformity, we need a common set of units of measurement, which are known as standard units.

Question 19.
What is S.I. system recommended ?
Answer:
S.I. system recommended for the following reasons:

  • It is a standardised unit, and hence, it is accepted universally.
  • Every minute measurements are possible in the system.
  • Inter conversion within the system is simple and hence, calculations are easy. The units do not change with time.

Measurement of Length and Motion Class 6 Extra Questions and Answers Science Chapter 5

Question 20.
Write any three precautions while taking a measurement?
Answer:

  • The scale should be placed along the length to be measured.
  • Your eye must be in front of and in line where the measurement is to be taken.
  • Ensure that ends of the scale are not wirn-out.

Measurement of Length and Motion Class 6 Extra Questions Long Answer Type

Question 1.
Give a method to measure the length of a pencil.
Answer:
To measure the length of a pencil, we choose a metre scale which should be placed along its length. In Fig. 15, zero mark on the scale coincides with the one end of the pencil and the reading coinciding with the other.
Measurement of Length and Motion Class 6 Extra Questions and Answers Science Chapter 5.2

has some thickness, we may make an error if the eye is not correctly placed. The eye is to be placed exactly above the point where the measurement is to be taken as shown in Fig. 15 from the position A. The other end of the pencil coincides with 8.5 cm mark. The length of the pencil is 8.5 cm .

Question 2.
How can we measure the length of a curved line using a thread? Explain with the help of illustration.
Answer:
For common pins on the sharp turnings of the curved line. In fig. 16, B,——-F,
Measurement of Length and Motion Class 6 Extra Questions and Answers Science Chapter 5.3

Fig. 16 : To measure the length of a curved line using a thread.
etc are the pins fixed on the curved line. Now tie a knot with cotton thread at the common pin A. Using fingers of both hands move the thread along the curved line such that it goes around pins B, C——-m F, etc.

Care should be taken that the thread is neither too tight nor too loose, when moved along the curved line. When the thread reaches the extreme end of the curved line, cut it from that point. Remove the thread from A and then place it straight along the length of half metre scale The length of the thread is equal to the length of curved line.

Measurement of Length and Motion Class 6 Extra Questions and Answers Science Chapter 5

Question 3.
What type of motion do the following objects have ?
(a) The galloping of a horse.
(b) Motion of a boy sliding down a slope.
(c) The movement of tip of the hand of a watch (or clock) on the dial.
(d) Motion of a child on a swing.
(e) The motion of a spinning top.
Answer:
(a) Linear motion.
(b) Reçtilinear motion.
(c) Circular motion.
(d) Periodic motion.
(e) Rotational motion.

Question 4.
Describe an activity to observe the motion of an ant.
Answer:
Aim: To observe the motion of an ant. Materials Required: A sheet of white paper, a little sugar.

Measurement of Length and Motion Class 6 Extra Questions and Answers Science Chapter 5.4

Procedure:

  • Spread a large sheet of white paper on the ground and keep a little sugar on it.
  • Ants are attracted to the sugar and many ants start crawling on the sheet of paper soon.
  • For any one ant, try and make a small mark with a pencil near its position when it has just crawled on to the sheet of paper.
  • Keep marking its position after a few seconds as it moves along on the sheet of paper.
  • After some time, shake the paper free of the sugar and the ants.
  • Connect the different points you have marked with arrows, to show the direction in which the ant was moving. Each point you have marked shows where the ant moved to, in intervals of a few seconds.
  • Conclusion: Motion seems to be some kind of a change in the position of an object with time.

Question 4.
Describe an activity to demonstrate circular motion.
Answer:
Aim : To demonstrate circular motion. Materials Required: A piece of stone and a thread.

Procedure:

  • Take a piece of stone.
  • Tie it to a thread and move it round and round rapidly with your hand by holding the other end of thread.

Measurement of Length and Motion Class 6 Extra Questions and Answers Science Chapter 5.5
The stone tied to a thread and moved round and rapidly undergoes circular motion.

Measurement of Length and Motion Class 6 Extra Questions and Answers Science Chapter 5

Observations: The stone tied to a thread and moved round and round rapidly undergoes circular motion. When the stone tied to a thread is moving round and round, then the distance of stone from our hand remains the same at all times.

Conclusion : In circular motion, the object moves in such a way that its distance from a fixed point (say the centre of circular path) remains the same.

Measurement of Length and Motion Class 6 Picture Based Questions

I. Observe the picture and answer the following questions :

Measurement of Length and Motion Class 6 Extra Questions and Answers Science Chapter 5.6

Question 1.
What does this picture depicts?
(a) Linear motion
(b) Oscillatory motion.
(c) Rotatory motion
(d) Circular Motion
Answer:
(b) Oscillatory motion

Question 2.
Give two examples of oscillatory motions.
(a) Motion of the pendulum of a wall clock.
(b) Motion of the heart muscles in a healthy person.
(c) Both (a) and (b) (d) None of above.
Answer:
(c) Both (a) and (b)

Measurement of Length and Motion Class 6 Extra Questions and Answers Science Chapter 5

Question 3.
Define oscillatory motion.
Answer:
The to-and fro motion of a body along the same path is called oscillatory motion.

II. Observe the picture and answer the following questions :

Measurement of Length and Motion Class 6 Extra Questions and Answers Science Chapter 5.7
Question 1.
What does this picture depicts?
(a) Circular motion
(b) Linear motions
(c) Rotatary motion
(d) Oscillatory motion
Answer:
(a) circular motion

Question 2.
Which one examples of circular motions.
(a) The movement of earth around the sun.
(b) The round and round movement of a child sitting on a merry-ground.
(c) Both (a) and (b) (d) None of above.
Answer:
(c) Both (a) and (b)

Question 3.
Define circular motion.
Answer:
When an object moves along a circular path, it is called circular motion.

Measurement of Length and Motion Class 6 Case Based Questions

I. For measuring larger lengths, we use a larger unit called a kilometre (km) which is equal to 1000 metres. And for measuring smaller lengths, we use units such as centimetre or millimetre.

Question 1.
What is the S.I. unit of length ?
(a) metre (m)
(b) millilitre
(c) kilogram
(d) none of these
Answer:
(a) metre (m)

Measurement of Length and Motion Class 6 Extra Questions and Answers Science Chapter 5

Question 2.
What is millimetre ?
(a) one-thousandthe of a metre
(b) ten-thousandthe of a metre
(c) two-thousandthe of a metre
(d) five-thousandthe of a metre
Answer:
(a) one-thousandthe of a metre

Question 3.
Give the unit for measuring the following:
(a) Distance between Delhi and Mumbai
(b) Thickness of a coin.
(c) Length of eraser
(d) Length of your shoe lace.
Answer:
(a) Kilometre,
(b) millimetre,
(c) centimetre,
(d) centimetre.

Question 4.
Name one unit of length which is bigger than a metre.
Answer:
Kilometre (km).

Measurement of Length and Motion Class 6 Extra Questions and Answers Science Chapter 5

Question 5.
Choose the smallest and biggest units of length from the following :
(i) cm (ii) m (iii) km (iv) mm
Answer:
Biggest unit of length = km
Smallest unit of length = mm

Class 6 Science Extra Questions

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