An iron nail is kept in each of the following liquids. In which case would it lose its shine and appear dull?

1

(a)

Mustard oil

(b)

Soft drink

(c)

Coconut oil

(d)

Kerosene

While doing an activity in class, the teacher asked Paheli to handover a translucent material. Which among the following materials will Paheli pick and give her teacher?

1

(a)

Glass tumbler

(b)

Mirror

(c)

Muslin cloth

(d)

Aluminium foil

Which pair of substances among the following would float in a tumbler half-filled with water?

1

(a)

Cotton thread, thermocol

(b)

Feather, plastic ball

(c)

Pin, oil drops

(d)

Rubber band, coin

Select a transparent substance:

1

(a)

Metal

(b)

Polished wood

(c)

Mirror

(d)

Glass

Copper metal is a

1

(a)

Good conductor of heat

(b)

Highly magnetic material

(c)

Translucent material

(d)

Ornamental metal

The material which ___________ in water is heavier than water.

1

(a)

sinks

Materials which cannot be compressed are called ___________ materials.

1

(a)

hard

Metals are good of __________ heat

1

(a)

conductors

The property which is identified with nose is _________

1

(a)

odour

Water is ______ while mustard oil is not.

1

(a)

transparent

Sugar does not dissolve in water.

1

(a) True

(b) False

Oil mixes with water.

1

(a) True

(b) False

Mustard oil is soluble in water.

1

(a) True

(b) False

Diamond is known as the hardest natural material.

1

(a) False

(b) True

Nitrogen gas is insoluble in water

1

(a) False

(b) True

Wood is used as a fuel. Which property makes it suitable for this purpose?

1

(a)

Combustibility.

Name two substances that do not shine

1

(a)

Wood and paper.

Why oil will not mix with water?

1

(a)

     

If you mix water and starch, what kind of solution you get?

1

(a)

      

The shopkeeper keeps similar type materials at one place. Why?

1

(a)

    

Name two materials which do not conduct electricity.

3

(a)

Write two things which are made from glass.

3

(a)

Mixtures of red chilli powder in water, butter in water, petrol in water and honey in water were given to Radha, Sudha, Sofia and Raveena respectively. Whose mixture is in solution form?

3

(a)

Name two objects that can float on water and two objects which sink in water

3

(a)

Name any two water soluble and water insoluble materials

3

(a)

1. List all items known to you that float on water. Check and see if they will float on an oil or kerosene.

   5

   (a)

2. What are lustrous materials? Give two examples

   5

   (a)

1. Why do you think oxygen dissolved in water is important for the survival of aquatic animals and plants.

   5

   (a)

2. (a) What do you understand by the term 'classification'?
   (b) Differentiate between transparent and opaque materials. Give two examples for each.
   (c) How can we make a normal paper translucent?

   5

   (a)