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Changes Around Us Worksheet-2

Changes Around Us Worksheet-2

 

  1. When magnesium ribbon is burnt, heat and light are produced. It is an example of

(a) Chemical change

(b) Physical and irreversible change

(c) Chemical and exothermic change

(d) Chemical and endothermic change

 

  1. Reverse of boiling is

(a) Condensation

(b) Evaporation

(c) Vaporization

(d) Freezing

 

  1. The process in which heat is taken in are

(a) Evaporation and melting

(b) Freezing and condensation

(c) Freezing and evaporation

(d) Condensation and melting

 

  1. In burning of paper

(a) A new substance is formed

(b) Change is permanent

(c) Both A new substance is formed &  Change is permanent

(d) Physical change occurs

 

  1. Expansion on heating, contraction on cooling and change of state is

(a) Chemical change

(b) Permanent change

(c) Reversible change

(d) Irreversible change

 

  1. Which of the following changes can be reversed?

(a) Batter to idli

(b) Bud to flower

(c) Cow dung to biogas

(d) Ice-cream to molten ice-cream

 

  1. Match column I with column II and choose the correct option from the codes given below:

 

Column – I

 

Column - II

  

A

Freezing

P

The change of a solid to a liquid

  

B

Melting

Q

The change of a vapor to a liquid

  

C

Condensation

R

The change of a liquid to vapor

  

D

Sublimation

S

The change of a liquid to a solid

  

E

Evaporation

T

The change of a gas directly to a solid

  

 

Answer Key:

(1)–(c); (2)–(a); (3)–(a); (4)–(c); (5)–(c); (6)–(d); (7)–A-S, B-P, C-Q, D-T, E-R