Question

LS- 6, Worksheet -1
Class: 6 Date: 15-07-2020
Subject: Science
I. Choose the correct answer and write a or b or c in the given brackets:

1. The burning of wood ( )
a)Can be reversed b) Cannot be reversed c) Can be melted

2. Which of the following is a reversible change? ( )
a) Tearing of paper b) Blowing air in a balloon
c) Breaking of stick
3. When Iron is heated it ( )
a) Contracts b) Dissolve c) Expand

4. When water is mixed with Plaster- of –Paris it becomes ( )
a) Soft b) Smooth c) Hard
5. The process in which water changes to vapour after heating is ( )
a) Melting b) Evaporation c) Condensation

6. Salt is separated from sea water by ( )
a) Filtration b) Condensation c) Evaporation

7. When the Iron blade is fixed to the Wooden handle it is fitted ( )
a) By heating then cooling b) By boiling then Freezing c) By cooling the heating
II. Give reason for each of the following:
a. Explosion of a cracker is irreversible change.
b. Dissolving sugar in water is a reversible change.
c. The ripening of a mango is irreversible change.
d. The melting of an Ice candy is a reversible change.
e. Burning of a incense stick ( Agarbathi) irreversible change.
NOTE:
Students complete the worksheet in the class work.

Answer 1

Answer:

b,b,a,c,b,a,b,

Explanation:

pls follow me I will follow u back

Answer 2

Answer:b,b,a,c,b,a,b

Explanation: