Question

A constant temperature at which solid start melting is called its -

(1) boiling point (2) freezing point (3) melting point (4) dew point

2. Which of the following is irreversible change?

(1) stretching of rubber (2) Blowing of balloon (3) Dough making (4) Burning of paper

3. The process in which an object becomes smaller is -

(1) expansion (2) contraction (3) freezing (4) all of the above

4. Rusting is a -

(1) slow process (2) fast process (3) very fast process (4) none of these

5. Deforestation is a -

(1) reversible change (2) irreversible change (3) chemical change (4) none of these

6. Melting of wax is a -

(1) reversible change (2) physical change (3) irreversible change (4) both (1) and (2)

7. Which of the following changes can be reversed ?

(1) Raw egg to boiled egg (2) Wet clothes to dry clothes

(3) Bud to flower (4) Cow dung to biogas

8. Which of the following changes cannot be reversed ?

(1) Milk to paneer (2) Cold milk to hot milk

(3) Yarn to knitted sweater (4) Wet clothes to dry clothes

9. Metal rim is fixed to the wooden cart wheel by:

(1) heating metal rim (2) heating wooden wheel (3) cooling metal rim (4) cooling wooden wheel

10. Which one of the step while burning a candle is not reversible?

(1) Melting of solid wax (2) Liquid wax changes into vapours

(3) Wax vapour burn into flame (4) All of these

11. Identify which one is false.

(1) Germination of mustard seed into a seedling is a slow change.

(2) Spinning of a top is fast change.

(3) Rusting of iron nail is fast change.

(4) Milk changes into curd is a slow change.​

Answer 1

Answer:

hey mate here your answer

1. melting point
2. stretching of rubber
3. contraction
4. slow process
5. irreversible change
6. Both 1 and 2
7. wet clothes to dry clothes

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