6th Std Science 5 Substances in the Surroundings-Their States and Properties l Question and Answer l

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Science Studies -  6th Standard

5. Substances in the Surroundings-Their States and Properties

Question And Answer

1. In the paragraph below, write ‘solid’, ‘liquid’ or ‘gas’ in each of the brackets depending on the substance referred to just before.

On a bright sunny day, Riya and Gargi are playing with a ball (solid) in the park. Gargi feels thirsty. So, Riya brings tender coconut water (liquid) for her. At the same time, a strong breeze (gas) starts blowing and it also begins to rain (liquid). They run back into the house (solid), change their clothes (solid) and then their mother gives them a cup ( solid ) of hot milk (liquid) to drink.

2. Discuss.

(a) Riya pours some water from her bottle into another bottle. Does it change the shape of the water ?

Ans: Yes, the shape of the water will change because liquids do not have a shape of their own. They take the shape of the container in which they are present.

(b) Halima picks up a small stone from the ground and puts it in the water in a dish. Does the shape of the stone change ?

Ans: No, the shape of the stone will not change by putting it in a dish containing water because solids have definite shape. They do not change their shape and retain it, no matter how it is kept.

3. Write the properties of these substances.

Water- Fluidity

Glass- Transparency, brittleness

Chalk- Brittleness

Iron ball- Hardness

Sugar- Solubility

Salt- Solubility

Flour- Solubility

Coal- Brittleness

Soil- Solubility

Pen- Hardness

Ink- Fluidity

Soap- Brittleness

4. What is sublimation ? Write the names of everyday substances that sublimate.

Ans: The change of a solid substance directly in to a gas or vapour without first changing into a liquid is called sublimation. Ex. Camphor (Kapur), naphthalene balls etc.

5. What is it made from? Why?

(a) A sickle to cut sugarcane.

Ans: It is made from iron, it has sharp edges which cut the sugarcane very easily.

(b) The sheets used for roofing.

Ans: It is made from aluminium because Aluminium is durable and rust free. It can protect house from heat and rains.

(c) A screwdriver

Ans: It is made of tough steel. Steel is strong hence help in joining nuts and bolts.

(d) A pair of tongs

Ans: It is made of stainless steel. Which is durable strong and rust free.

(e) Electric cables

Ans: This are made up of good conductor of electricity. i.e copper

(f) Ornaments

Ans: This are made up of gold or silver. Because they are easily moulded into the different shapes.

(g) Pots and pans

Ans: Copper is used to make pots and pans because it is a good conductor of heat.

6 What will happen if….? And why ?

(a) Nails are made of plastic.

Ans: If nails are made out of plastic, they cannot be used for its usual purposes. They could not be hammered like iron nails.

(b) A bell is made of wood.

Ans: If a bell is made of wood, it will not ring. The bells are made up of metals like copper etc. As they show the property of sonority i.e the ability to produce a ringing sound when strike upon. Wood does not have this property and hence cannot be used to make bells.

(c) Rubber is not fitted on a pair of tongs.

Ans: Tongs are generally made from metal and metal conduct heat. If rubber handles are not attached to the things they will conduct heat which will burn the users hand.

(d) A knife is made of wood.

Ans: Knife is used to cut vegetables, fruits etc. The regular knifes which we use are made up of metals like iron etc. As they are hard, strong and durable. Knifes made out of wood cannot be used for cutting or chopping purposes.

(e) An axe is made of rubber.

Ans: An axe is used to cut wood. It is made up of metals because they are strong, hard and durable. These properties are not applicable to rubber. If an axe is made of rubber we caould not cut the hard things with it.

7. Who am I ?

(a) I’m found in a thermometer, I measure your temperature.

Ans: Mercury

(b) I make things hot or cold.

Ans: Temperature

(c) I have no shape whatsoever !

Ans: Gas

(d) I dissolve in water, but not in kerosene.

Ans: Salt

8. Why does this happen ?

(a) Coconut oil thickens in winter.

Ans: The freezing point of coconut oil is less. In winter the atmospheric temperature is low thus in water the freezing point of coconut oil is reached thus it freezes and appears thick.

(b) Kerosene left open in a dish disappears.

Ans: The kerosene left in an open dish disappears due to evaporation.

(c) The fragrance of incense sticks lighted in one corner of a room spreads to the other corner.

Ans: When incense stick are lighted they release fragrant smoke which is spread in all the corner of room. Thus, the fragrance of incense sticks lighted in one corner of room spread to the other corner.

(d) What you see in the picture.

Ans: The balloon floats on water while Apple settle to the bottom of water.

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