NCERT Solutions for Class 6 Science Chapter 7 Motion and Measurement of Distances

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1. The distance between Delhi and Mumbai is usually expressed in units of
(a) decametre
(b) metre
(c) centimetre
(d) kilometre

2. 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 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.

3. 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

4. Fill in the blanks
(i) Motion of an object or a part of it around a fixed point is known as ……………. motion.
(ii) A body repeating its motion after certain interval of time is in ……… motion.
(iii) In rectilinear motion, object moves……….. a ………. line.
(iv) SI unit of length is……….

5. Four children measure the length of a table which was about 2 m. Each of them used different ways to measure it.
(i) Sam measured it with a half metre long thread.
(ii) Gurmeet measured it with a 15 cm scale from her geometry box.
(iii) Reena measured it using her hand span.
(iv) Salim measured it using a 5 m long measuring tape.

6. Which one of them would get the most accurate length? Give reason for your answer.
7. Write one example for each of the following type of motion.
(i) Rectilinear
(ii) Circular
(iii) Periodic
(iv) Circular and periodic

Answer: 1 (d)
Answer 2 (c)
Answer 3 (d)
Answer 4. (i) circular (ii) periodic (iii) straight; along (iv) metre

Answer 5. Salim would get the most accurate length. The reason is that in this case the length of the table can be measured in one go because the measuring tape is longer than the table. In the other cases the chance of making an error is higher due to multiple measurement. In case of Sam, he can measure the lengths which are exact multiples of half a metre.

Answer 6. (i) An object moving on a straight road, falling stone, etc.
(ii) A mark on blades of a rotating fan, tips of the hands of a clock, etc.
(iii) Motion of a child on a swing, motion of pendulum, strings of a guitar, etc.
(iv) Blades of a rotating fan, hands of a clock, etc.