The distance between Delhi and Mumbai is usually expressed in the unit of

1

(a)

decametre

(b)

metre

(c)

centimetre

(d)

kilometre

A ball rolling on the ground represents

1

(a)

rectilinear motion

(b)

rotational motion

(c)

Both (a) and (b)

(d)

None of the above

S.I. unit of length is

1

(a)

Centimetre

(b)

10mm

(c)

Metre

(d)

Kilometre

1 metre is equal to :

1

(a)

10 cm

(b)

10 decimetre

(c)

10 decametre

(d)

None of these

A means of transport along water routes is :

1

(a)

Boat

(b)

 Train

(c)

Bicycle

(d)

Bus

Motion of the needle of a sewing machine is ____________________

1

(a)

periodic motion

Motion of an object or a part of it around a fixed point is known as __________motion.

1

(a)

circular

In rectilinear motion, object moves _________________a______________ line.

1

(a)

in, straight

A plucked string of a sitar executes ________________motion.

1

(a)

periodic oscillatory

Different modes of___________________ are used to go from one place to another.

1

(a)

transport

One metre is equal to 1000 cm.

1

(a) True

(b) False

An elastic tape cannot give a true measurement.

1

(a) False

(b) True

Motion of a wheel of a car is rectilinear as well as circular motion.

1

(a) False

(b) True

The object which does not change its position time is said to be at rest.

1

(a) False

(b) True

You have seen your father playing violin.While playing it, you observed that the strings. Are creating the sound.Can you tell due to what motion it si giving the sound?

1

(a)

      

Name some objects having periodic motion.

1

(a)

      

Give the name of the motion possessed by the vehicles on a straight road.

2

(a)

Name the motion exhibited by a freely falling stone.

2

(a)

State an example of a rotational motion.

2

(a)

Name any of the early modes of transport that are not in use today.

2

(a)

Give two examples of a periodic motion

2

(a)

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

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)

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)

While travelling in a train, it appears that the trees near the track are moving whereas co-passengers appear to be stationary. Explain the reason.

5

(a)

It is not accurate to measure a length with elastic tapes. Explain why.

5

(a)