VI(6th)Science:Motion and Measurement of Distances : NCERT/CBSE

Answer the following question in brief

1. Give two example of periodic motion?

Ans: Motion of swing, Motion of pendulum, Motion of the earth around the sun

2. Shamvavi height is is 1.75m .Expess in cm and mm?

Ans: Shamvavi height is is 1.75m =1.75x100cm=175cm =175x10mm=1750mm

3. The length of table is 4270mm.Express in cm and m

Ans:  10mm =1cm Þ4270 m m = 4270/10=427cm

100cm = 1m     Þ427cm =427/100m =0.427m

4. Why does foot step not used in standard unit of length?

Ans: it is because  foot step vary from person to person

5. While measuring the length of paper clip, the reading of the scale at one end is 1.0 cm and on the other end is 4.7 cm. What is the length of paper clip?

Ans: The length of the needle = (4.7- 1.0) cm = 3.7 cm

6. The distance between main gate of red fort and india gate is 4279m .Express in km?

Ans: 1000m = 1km Þ4279/1000 km=4.279km

7. Arrange the following length in increasing order ; 1km;1mm;1cm;1m

Ans: length in increasing order 1mm < 1cm < 1m < km

8. Roll a ball on ground. Identify the types of motion?

Ans: A rolling ball moves in straight line on ground is combination of Rectilinear and rotatory motion.

9. Classify the following into different types of motion:

a) The motion of man on a straight road.  b) The motion of wheels of a car .

c) The motion of a falling stone.

Ans: a) rectilinear motion.  b) circular motion. c) rectilinear motion.

10. Give an example for following types of motion:

1. Linear Motion. 2. Circular Motion.  3. Rotatory Motion. 

Ans: 1. A moving carin a straight line is an example of a linear motion.

2. Motion of blades of fan is an example of circular motion.

3. Rotation of earth on its axis is an example of rotatory motion.

Answer the following question in detail

1. Discuss significance of measurement?

Ans: measurement helps us to compare unknown quantity with known quantity. Measurement helps us make quantitative statements about something like how big, how long, how fast .

2. What are the different means of transport on land, air and water?

Ans: The different means of transport on land are : train, Bus, Car,

The different means of transport in air are : Aero planes , Gliders, Space ship

The different means of transport on water are : Ships, Boats

3. What is the need of standard unit for measurements?

Ans: For uniformity all over the world we need standard unit for measurements.

4. What is multiple motions. Explain?

Ans: The motion of a body some time may be combination of two or more types of motion called multiple motion. For example : Motion of earth around sun is Translatory  motion where as Motion of earth on its axis is rotatory motion.

5.How can you measure  length of a curved line?

(a) First of all we have to take a thread

(b) Now move the thread along the path of the curved surface 

(c) Mark the thread at the end point up to which you want to measure the length 

(d) Place the thread on the scale starting from zero to the marked end point.

(e)  Measure this length by the help of the scale