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Chapter 10 Motion and Measurement of Distances Solutions

Question - 1 : -  Give two examples each, of modes of transport used on land, water and air.

Answer - 1 : -

Land- Train., Bus

Water- Ship, Boat

Air- Helicopter, Airplane

Question - 2 : -
Fill in the blanks:

(i) One metre is ______________ cm.
(ii) Five kilometer is ______________ m.
(iii) Motion of a child on a swing is ______________.
(iv) Motion of the needle of a sewing machine is ______________.
(v) Motion of wheel of a bicycle is______________.

Answer - 2 : -

(i) One metre is 100 cm.

(ii) Five kilometers is 5000 m.

(iii) The motion of a child on a swing is periodic.

(iv) The motion of the needle of a sewing machine is periodic.

(v) The motion of the wheel of a bicycle is circular.

Question - 3 : - Why can a pace or a footstep not be used as a standard unit of length?

Answer - 3 : -

Pace or a footstep cannot be used as a standard unit of length because it varies from person to person.

Question - 4 : - Arrange the following lengths in their increasing magnitude: 1 metre, 1 centimeter, 1 kilometer, 1 millimeter.

Answer - 4 : -

1 millimeter, 1 centimeter, 1 metre, 1 kilometer

Question - 5 : - The height of a person is 1.65 m. Express it into cm and mm.

Answer - 5 : -

1.65= 165 cm = 1650 mm

Question - 6 : - The distance between Radha’s home and her school is 3250 m. Express this distance into km.

Answer - 6 : -

1km = 1000 m

Hence 3250 m = 3.25 kms

Question - 7 : - 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 - 7 : -

Length of needle = 33.1 – 3 = 30.1 cm

Question - 8 : - Write the similarities and differences between the motion of a bicycle and a ceiling fan that has been switched on.

Answer - 8 : -

Similarities- Both show circular motion

Differences- Bicycle wheels move in rectilinear motion, but the fan does not move in rectilinear motion.

Question - 9 : - Why would you not like to use a measuring tape made of an elastic material like rubber to measure distance? What would be some of the problems you would meet in telling someone about a distance you measured with such a tape?

Answer - 9 : -

An elastic measuring tape will not give accurate measurement as it stretches in length and reduces in size when stretched. When we express measurement taken with elastic tape, we have to tell whether the tape was stretched. If yes, how much. Hence it is very difficult to tell the measurement taken from an elastic tape.

Question - 10 : - Give two examples of periodic motion.

Answer - 10 : -

a) A needle of a sewing machine

b) Pendulum

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