Here in this post we provided NCERT Exemplar Problem Class 6 Science Motion and Measurement of Distances Chapter 10 Full Explanation by group of Science Experts. We have provided here each questions answer with reason behind the answer.
Hope it help you!
Motion and Measurement of Distances Class 6 Exemplar full Explanation:
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Multiple Choice Questions
1) The distance between Delhi and Mumbai is usually expressed in units of
a) Decametre
b) Metre
c) Centimetre
d) Kilometre
Answer:- d) kilometre
Large distance are measured larger unit of length i.e. Kilometre.
2) 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
Answer:- d) time of the first bell in the school.
First bell in the school does not show time interval. A day , a second, and a school repeats it’s motion after a fixed time interval.
3) Fig. 10.1 shows a measuring scale which is usually supplied with a geometry box. Which of the following distance cannot be measured with this scale by using it only once?
a) 0.1 m
b) 0.15 m
c) 0.2 m
d) 0.05 m
Answer:-c) 0.2 m
According to the figure 10.1
0.2 m cannot be measured with this scale by using it only once.
4) A piece of ribbon folded five times is placed along a 30 cm long measuring scale as shown in fig. 10.2 .
The length of the ribbon is between
a) 1.15 m – 1.25 m
b) 1.25 m – 1. 35 m
c) 1.50 m- 1. 60 m
d) 1.60 m – 1. 70 m
Answer:- b) 1.25 m – 1.35 m
According to figure the length of the ribbon should be 1.25 m – 1.35 m .
5) Paheli moves on a straight road from point A to point C. She takes 20 minutes to cover a certain distance AB and 30 minutes to cover the rest of the distance BC. She then turns back and takes 30 minutes to cover the distance CB and 20 minutes to cover the rest of the distance to her starting point. She makes 5 rounds on the road the same way. Paheli concludes that her motion is
a) Only rectilinear motion.
b) Only periodic motion.
c) Rectilinear and periodic both.
d) Neither rectilinear nor periodic.
Answer:- c) Rectilinear and periodic both.
Paheli was moving along the straight path and with the same period of time therefore rectilinear and periodic both.
6) 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 fig. 10.3 which of the following is /are 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
Answer:- b) Longer distance with a higher speed
Bholu has covered the longer distance with a higher speed according to the figure.
7) Four pieces of wooden sticks A, B, C, D are placed along the length of 30 cm long scale as shown in fig. 10.4 which one of them is 3.4 cm in length.
a) A
b) B
c) C
d) D
Answer:- c) C
As per the figure, 3.4 cm length is measured in figure C.
8) Which of the following figure shows the correct placement of a block along a scale for measuring it’s length?
A
B
C
D
Answer :- B) shows the correct placement for of a block to measure it’s length.
9) You have provided three scales A, B and C as shown in fig. 10.6 to measure a length of 10 cm.
A
B
C
For the correct Measurement of the length you will use the scale.
a) A only
b) B only
c) C only
d) Any of the three scales.
Answer:- d) Any of the three scales.
All the three scales can measure the distance of 10 cm.
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Very Short Answer Questions
10) Correct the following
i) The motion of a swing is an example of rectilinear motion.
Answer:- The motion of a swing is an example of periodic motion and not of Rectilinear motion.
ii) 1 m = 1000 cm
Answer:- 1 m = 100 cm
11) Fill in the blanks
i) Motion of the object or a part of it around a fixed point is known as _____________ motion.
Answer:- motion of the object or a part of it around a fixed point is known as circular motion.
ii) A body repeating it’s motion after certain interval of time is in _____________ motion.
Answer:- A body repeating it’s motion after certain interval of time is in periodic motion.
iii) In rectilinear motion, object moves ___________ a ___________ line.
Answer:- In Rectilinear motion, object moves straight a along line .
iv) SI unit of length is ___________.
Answer:- SI unit of length is metre.
12) Write one example of each of the following type of motion.
a) Rectilinear
Answer:- Falling of stone, walking along straight road, March- past of soldiers.
b) Circular
Answer:- tips of hands of clock, motion of moving fan.
c) Periodic
Answer:- Motion of pendulum, strings of a guitar.
d) Circular and periodic
Answer:- hands of clock.
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Short Answer Questions
13)
The photograph given as fig. 10.7 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?
Answer:-
The curved iron bars cannot be measured with the scale directly but the iron bars can be measured with the help of a thread. Further the thread is measured with the help of scale. And thus the length of curved iron bars will be measured and his payment could be done.
14) Identify the different types of the motion in the following word
Answer:-
15) Four children measure the length of a table which was about 2 m. Each of them used different ways to measure it.
a) Sam 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 hand span.
d) Salim measured it using a 5 m long measuring tape.
Which of the them would get most accurate length? Give reason for your answer.
Answer:-
As per the given information,
Salim will measure the most accurate length. The length of the table is 2m and the Salim is measuring the table with the tape of 5m . Thus the table will be measured in only one round. But in the others case there are chances to make the errors as they are using the small length measuring instruments than the length of table.
16) Match the event related to motion in column I with the type of motion in column II.
Column I |
Column II |
a) A moving wheel of a sewing machine. |
i) Circular motion |
b) Movement of tip of the minute hand of a clock in one hour. |
ii) Rotational motion |
c) A moving swing. |
iii) Periodic motion |
Answer:
A) A moving wheel of a sewing machine →ii) Rotational motion
B) movement of tip of The minute hand of a clock In one hour. → i) circular motion
C) A moving swing → iii) periodic motion
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Long Answer Questions
17) 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.
Answer:-
When we see the trees from the moving train, we found that the trees are moving. Actually it’s us who is moving. But when we see the passengers we all are in the same moving train therefore we don’t found them moving. Thus they appears to be stationary.
18) How are the motions of a wheel of a moving bicycle and a mark on a blade of a moving electric fan different? Explain.
Answer:-
The motion of a wheel of a moving bicycle is circular motion and also the bicycle is moving along the straight road thus it is also a rectilinear motion. And the blade of a moving electric fan shows only circular motion.
19) Three students measured the length of a corridor and reported their measurements . The values of their measurements were different. What could be the reason for difference in their measurements? (Mention any three)
Answer:-
1) The difference should be occurred due to the different measuring devices used by the three of them.
2) Errors may be occurred in any their values as they may be used small length measuring devices.
3) Ends of corridor should not be easily measured thus there should be error occurs.
4) They might not used standardized devices for the measurement.
20) Boojho was riding in his bicycle along a straight road. He classified the motion of various parts of the bicycle as (i) rectilinear motion, (ii) circular motion, (iii) both rectilinear as well as circular motion. Can you list one part of the bicycle for each type of motion? Support your answer with reason.
Answer:-
As per the given information,
Rectilinear motion is of bicycles handle bar or seat of the bicycle.
Circular motion is of the bicycles pedals. As they moved circular.
And the wheel shows the rectilinear motion with circular motion as the wheel moves circular and along the straight road thus rectilinear motion.