Chapter 16: Physical & Chemical Changes - Science Mcqs for Grade 7 - Set 4

1)   Ethene' is

a. alkane
b. alkene
c. alcohol
d. carboxylic acid
Answer  Explanation 

ANSWER: alkene

Explanation:
No explanation is available for this question!


2)   Most of the fuels such as petroleum has

a. carbohydrates
b. fats
c. hydrocarbons
d. metals
Answer  Explanation 

ANSWER: hydrocarbons

Explanation:
No explanation is available for this question!


3)   Molecules in high density polythene are

a. closely packed than low density polythene
b. far apart than in low density polythene
c. more vigorous than in low density polythene
d. more violent than in low density polythene
Answer  Explanation 

ANSWER: closely packed than low density polythene

Explanation:
No explanation is available for this question!


4)   Generally methane gas is known as

a. compressed gas
b. liquid gas
c. natural gas
d. artificial gas
Answer  Explanation 

ANSWER: natural gas

Explanation:
No explanation is available for this question!


5)   Gases are

a. incompressible
b. compressible
c. colorful
d. dense than liquids and solids
Answer  Explanation 

ANSWER: compressible

Explanation:
No explanation is available for this question!


6)   When solids are heated, they

a. expand more than liquids
b. expand more than gases but less than liquids
c. expand more than liquids but less than gases
d. expand less than both liquids and gases
Answer  Explanation 

ANSWER: expand less than both liquids and gases

Explanation:
No explanation is available for this question!


7)   The change of shape of liquid according to the shape of container is due to

a. space between particles
b. collision of particles
c. movement of particles
d. force of attraction between particles
Answer  Explanation 

ANSWER: space between particles

Explanation:
No explanation is available for this question!


8)   Melting point of 'sulphur' is

a. 113 °C
b. 311 °C
c. both
d. none
Answer  Explanation 

ANSWER: 311 °C

Explanation:
No explanation is available for this question!


9)   To separate the molecules of ethene dichloride, the compound is

a. heated lightly
b. heated gently
c. heated strongly
d. heated for a long time
Answer  Explanation 

ANSWER: heated strongly

Explanation:
No explanation is available for this question!


10)   For security and military purpose, ammonia is used in

a. explosives
b. bullets
c. flash bangs
d. tear gas shells
Answer  Explanation 

ANSWER: explosives

Explanation:
No explanation is available for this question!


11)   The shape of solid is

a. changeable
b. definite
c. irregular
d. regular
Answer  Explanation 

ANSWER: definite

Explanation:
No explanation is available for this question!


12)   The reaction in which heat is taken while taking place, is known as

a. exothermic reaction
b. endothermic reaction
c. reversible reaction
d. substitutive reaction
Answer  Explanation 

ANSWER: endothermic reaction

Explanation:
No explanation is available for this question!


13)   Large and long molecules made by the linkage of small molecules are known as

a. polyesters
b. polymers
c. polypeptides
d. polysomerism
Answer  Explanation 

ANSWER: polymers

Explanation:
No explanation is available for this question!


14)   John Hyatt's invention was about

a. cellulose in wood
b. soil particles under plant roots
c. plant stem
d. barks of wood
Answer  Explanation 

ANSWER: cellulose in wood

Explanation:
No explanation is available for this question!


15)   Polyvinyl chloride is a

a. metal
b. plastic
c. metalloid
d. gas
Answer  Explanation 

ANSWER: plastic

Explanation:
No explanation is available for this question!


16)   Oils is separated from crude oil through the process of

a. simple distillation
b. fractional distillation
c. filtration
d. vaporization
Answer  Explanation 

ANSWER: fractional distillation

Explanation:
No explanation is available for this question!


17)   The name of the oil from which ethene is obtained is

a. naphtha
b. kerosene
c. diesel
d. bitumen
Answer  Explanation 

ANSWER: naphtha

Explanation:
No explanation is available for this question!


18)   In the process of forming iron sulfide by iron and sulphur, the reactant is

a. iron only
b. sulphur only
c. iron and sulphur both
d. sulphuric acid
Answer  Explanation 

ANSWER: iron and sulphur both

Explanation:
No explanation is available for this question!


19)   The properties of 'plastic' depends on

a. molecules and their arrangement
b. linked atoms
c. type of hydrocarbon
d. properties of elements
Answer  Explanation 

ANSWER: molecules and their arrangement

Explanation:
No explanation is available for this question!


20)   When ethene and chlorine combine together, they form

a. chlorine ethenide
b. ethene chloride
c. ethene dichloride
d. ethene trichloride
Answer  Explanation 

ANSWER: ethene dichloride

Explanation:
No explanation is available for this question!