Give two examples each of modes of transport used on land, water and air.

3

(a)

Why can a pace or a footstep not be used as a standard unit of length?

3

(a)

Arrange the following lengths in their increasing magnitude.
1 metre, 1 centimetre, 1 kilometre, 1 millimetre

3

(a)

While measuring the length of a knitting needle, the reading of the scale at one end is 3 cm and at the other end is 33.1 cm. What is the length of the needle?

3

(a)

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

3

(a)

Can an object be in motion and rest simultaneously for different observers? Give an example and consequence.

3

(a)

We need standard unit of measurements for a quantity. Explain why.

3

(a)

There was a quarrel between Ram and Shyam as the measured length of his school table was different for each other. Priya came and told that calculation of length by Shyam is more accurate and give a simple explanation for it.
(a) State the values that Priya reflect here.
(b) Mention the cause for different measurement of Ram and Shyam.

3

(a)

Will the measurement of a room using foot of different persons be equal or not?

3

(a)

Describe in detail that how do the thickness of a thin wire can be determined.

3

(a)

Boojho is not sure why we say that the distance of the stone from your hand is same when we whirl it around. Can you help him understand this? Remember that stone is held with string.

3

(a)

Give an example for the following types of motion:
(i) Linear motion
(ii) Circular motion
(iii) Rotatory motion

3

(a)

Describe three rules to measure length.

3

(a)

A carpenter is fixing a curtain rod on the wall by tightening a screw. How many different kinds of motions is the screw undergoing?

3

(a)

Mira's mother is stitching a frock with the help of a sewing machine for her. Mira observes that the sewing machine remains at the same location while its wheel rotates and needle moves up and down.
(i) What type of motion does the needle undergo?
(ii) Wheel moves with a particular motion. Name it.

3

(a)