NCERT PRACTICE QUESTIONS
1. Give two examples each, of modes of transport used on land, water and air.
Ans. - Land- Train, bus. Water- Ship, Boat. Air- Helicopter, Air-balloon.
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______________.
Ans.- (i)100 cm. (ii) 5000 m. (iii) periodic. (iv) periodic. (v) circular.
3. Why can a pace or a footstep not be used as a standard unit of length?
Ans.- Pace or a footstep cannot be used as a standard unit of length because it varies from person to person based on age and body type of an individual.
4. Arrange the following lengths in their increasing magnitude: 1 metre, 1 centimeter, 1 kilometer, 1 millimeter.
Ans. - 1 millimeter, 1 centimeter, 1 metre, 1 kilometer
5. The height of a person is 1.65 m. Express it into cm and mm.
Ans.- 1.65 = 165 cm = 1650 mm
6. The distance between Radha’s home and her school is 3250 m. Express this distance into km.
Ans.- 1km = 1000 m, thus 3250 m = 3.25 km.
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?
Ans.- Length of needle = 33.1 – 3 = 30.1 cm
8. Write the similarities and differences between the motion of a bicycle and a ceiling fan that has been switched on.
Ans.- Similarity- Both show circular motion. Difference- Bicycle wheels move in rectilinear motion, but the fan does not move in rectilinear motion.
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?
Ans.- An elastic measuring tape will not give accurate measurement as it stretches in length and reduces back in size when de-stress. When we express measurement taken with elastic tape, we have to tell whether the tape was stretched or de-stress.
10. Give two examples of periodic motion.
Ans.- A needle of a sewing machine, a pendulum.
Junior Science Topic - Motion And Measurement Of Distance. Chapter notes, video lectures, power point presentation and NCERT exercise solution. (Class VI, CBSE syllabus, chapter 10)
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