Question

5.
d. Rusting of iron
What causes sagging of electric wires during summer?
Expansion
Contraction
Both expansion and contraction
d. Neither expansion nor contraction
b.
C.
B. Fill in the blanks using the words given in the box.
physical
state
irreversible
rusting
expansion
chemical
1. Burning of paper is a
and
change.
2. Melting of ice changes its
3. Tearing of paper is a
change.
4. The railway tracks are left with some gaps in between so that they allow
5.
of iron is a chemical change.​

Answer 1

Answer:

A. contraction

B.

1. chemical

2. state

3. physical

4. rusting

5. expansion

Explanation:

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Answer 2

Answer:

answers is below

Explanation:

What causes sagging of electric wires during summer?

ans)expansion

fill ups

1)chemical change & irreversible change

2)state

3)physical

4)expansion

5)rusting

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