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

Figure shows a measuring scale which is usually supplied with a geometry box. Which of the following distance cannot be measured with this scale by using it only once?

1

(a)

0.1 m

(b)

0.15m

(c)

0.2 m

(d)

0.05 m

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

A ball rolling on the ground represents

1

(a)

rectilinear motion

(b)

rotational motion

(c)

Both (a) and (b)

(d)

None of the above

2000 cm is equal to ________________metre.

1

(a)

20

A plucked string of a sitar executes ________________motion.

1

(a)

periodic oscillatory

The length of a curved line can be measured by using a___________________

1

(a)

thread or measuring tape

Motion is the change in ___________________of an object.

1

(a)

position

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

1

(a)

transport

The SI unit of distance is cm.

1

(a) True

(b) False

A flying bird in the sky is at rest.

1

(a) True

(b) False

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

1

(a) False

(b) True

A cloth merchant uses a meter rod to measure the length of the cloth.

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

To measure chest, what type of measuring device would you use?

2

(a)

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

2

(a)

How do people know how far they have travelled?

2

(a)

How can we use a string to measure distances less then the length of the string?

2

(a)

How would you decide whether an object is in motion or at rest? 

2

(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)

Briefly explain the type of motion performed by the earth.

3

(a)

Mamta is measuring a piece of wood with broken meter scale. Her friend Kanchan correct her by measuring it from any full mark of meter
(a) State the values that Kanchan reflect here.
(b) Give one correct way for measurement.

3

(a)

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

5

(a)

Boojho was riding in his bicycle along a straight road. He classified the motion of various parts of the bicycle as (a) rectilinear motion (b) circular motion and (c) both rectilinear as well as circular motion. Can you list one part of the bicycle for each type of motion? Support your answer with reason.

5

(a)