Which among the following materials would you identify as soft materials and why?
Ice, rubber band, leaf, eraser, pencil, pearl, a piece of wooden board, cooked rice, pulses and fresh chapati.

5

(a)

Give the name of two objects each which can be made from the following materials.
(a) Glass
(b) Iron
(c) Gold
(d) Aluminium

5

(a)

Check whether the substance disappears in water or not

Substance	Disappears in water/does not disappear
Salt	Disappears completely in water
Sugar
Sand
Chalk powder
Sawdust

5

(a)

A solid is put in a bucket of water. It floats just below the surface of the water. What do you think is the density of the object in relation to the density of water?

5

(a)

Sugar, salt, mustard oil, sand, sawdust, honey, chalk powder, petals of flower, soil, copper sulphate crystals, glucose, wheat flour are some substances given to Paheli. She wants to know whether these substances are soluble in water or not. Help her in identifying soluble and insoluble substances in water.

5

(a)

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

5

(a)

Chalk, iron nail, wood, aluminium, candle, cotton usually look different from each other. Give some properties. by which we can prove that these materials are different.

5

(a)

During summer holidays, a group of children collected a lump of salt, green grass, broken glass piece, a small thermocol box, pen, iron nail, glass. marbles, hair, naphthalene ball, a piece of sugar candy (mishri) and tried to group them on the basis of properties given in table. Help them in filling the table.

Name of material

Appearance (Hard/Soft)

Transparency (Transparent/Translucent/Opaque)

Floats/Sinks in water

Soluble/Insoluble in water

5

(a)

(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)

Chalk, iron nail, wood, aluminium, candle, cotton usually look different from each other. Give some properties by which we can prove that these materials are different.

5

(a)