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

1

(a)

decametre

(b)

metre

(c)

centimetre

(d)

kilometre

Which of the following does not express a time interval?

1

(a)

A day

(b)

A second

(c)

A school period

(d)

Time of the first bell in the school

Paheli moves on a straight road from point A to point G. She takes 20 min to cover a certain distance AB and 30 min to cover the rest of distance BG. She then turns back and takes 30 min to cover the distance GB and 20 min to cover the rest of the distance to her starting point. She makes 5 rounds on the road of the same way. Paheli concludes that her motion is

1

(a)

only rectilinear motion

(b)

only periodic motion

(c)

rectilinear and periodic motion

(d)

neither rectilinear nor periodic

Curved length can be measured by :

1

(a)

Metre scale

(b)

Cubit

(c)

Measuring tape

(d)

All of these

Find the odd one out:

1

(a)

Rotation of earth about its axis

(b)

Tabla surface

(c)

Blades of rotating fan

(d)

Moving vehicle on straight road

One metre is _________cm.

1

(a)

100

Five kilometre is ___________m

1

(a)

5000

Motion of a child on a swing is_________________

1

(a)

periodic motion

What is motion?

1

(a)

If a body moves from its position, then it is said to be in motion.

What is straight line motion?

1

(a)

When a body moves in a straight line, it is called rectilinear motion

One metre is equal to 1000 cm.

1

(a) True

(b) False

Motion of earth about its own axis is rotatory.

1

(a) False

(b) True

From a broken meter scale, measurement can be done from zero mark.

1

(a) True

(b) False

An elastic tape cannot give a true measurement.

1

(a) False

(b) True

The SI unit of distance is cm.

1

(a) True

(b) False

You are given a cotton thread and a wool thread. Which thread can be used to measure the length of an object and why?

1

(a)

    

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)

      

When a fan is rotating , we observe the blades are rotating in opposite direction. Why?

1

(a)

   

While playing a kite you observe the kite motion will not be in the same direction. Why?

1

(a)

    

Name some objects having periodic motion.

1

(a)