Chapter 16: Physical & Chemical Changes - Science Mcqs for Grade 7 - Set 1

1)   Gases are compressible because of

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

ANSWER: space between particles

Explanation:
No explanation is available for this question!


2)   Number of gases joined together to make PVC is

a. 2
b. 3
c. 4
d. 5
Answer  Explanation 

ANSWER: 2

Explanation:
No explanation is available for this question!


3)   As compare to gases, liquids are

a. incompressible
b. compressible
c. more compressible than liquids
d. less compressible than liquids
Answer  Explanation 

ANSWER: incompressible

Explanation:
No explanation is available for this question!


4)   Bakelite is a good

a. conductor
b. insulator
c. metal
d. solid
Answer  Explanation 

ANSWER: insulator

Explanation:
No explanation is available for this question!


5)   When gases are heated, they

a. expand more than solids but less than liquids
b. expand more than liquids but less than solids
c. do not expand
d. both b and c
Answer  Explanation 

ANSWER: both b and c

Explanation:
No explanation is available for this question!


6)   Meaning of the word "anhydrous" is

a. with water
b. without water
c. with copper
d. without copper
Answer  Explanation 

ANSWER: without water

Explanation:
No explanation is available for this question!


7)   The color of solid magnesium is

a. dark grey
b. silver grey
c. black
d. whitish silver
Answer  Explanation 

ANSWER: silver grey

Explanation:
No explanation is available for this question!


8)   Ammonia is

a. green in color
b. blue in color
c. colorless
d. brown in color
Answer  Explanation 

ANSWER: colorless

Explanation:
No explanation is available for this question!


9)   When liquids are heated, they

a. expand more than gases but less than solids
b. expand more than solids but less than gases
c. do not expand
d. none of above
Answer  Explanation 

ANSWER: expand more than solids but less than gases

Explanation:
No explanation is available for this question!


10)   What are the chemicals used in fireworks?

a. copper chloride
b. calcium chloride
c. barium chloride
d. all of above
Answer  Explanation 

ANSWER: all of above

Explanation:
No explanation is available for this question!


11)   The least intermolecular forces are found in

a. solids
b. liquids
c. gases
d. fluids
Answer  Explanation 

ANSWER: gases

Explanation:
No explanation is available for this question!


12)   In electric field, "PVC" is used to make

a. pipes
b. wire cover
c. tungsten wire
d. switches
Answer  Explanation 

ANSWER: pipes

Explanation:
No explanation is available for this question!


13)   The material which John Hyatt used for his artificial ivory, was

a. complex
b. chromatid
c. celluloid
d. diplex
Answer  Explanation 

ANSWER: celluloid

Explanation:
No explanation is available for this question!


14)   At the end of reaction, catalyst

a. vanishes
b. is used up
c. remains unchanged
d. resizes
Answer  Explanation 

ANSWER: remains unchanged

Explanation:
No explanation is available for this question!


15)   As compare to low density polythene, the high density polythene is

a. weak
b. strong
c. rough
d. soft
Answer  Explanation 

ANSWER: strong

Explanation:
No explanation is available for this question!


16)   The chemist who started plastic industry was an

a. Chinese
b. Indian
c. American
d. British
Answer  Explanation 

ANSWER: American

Explanation:
No explanation is available for this question!


17)   Ethene is obtained from

a. light oil
b. coconut oil
c. olive oil
d. sunflower oil
Answer  Explanation 

ANSWER: light oil

Explanation:
No explanation is available for this question!


18)   Two major requirements for preparation of ammonia are

a. low temperature and high pressure
b. low temperature and pressure
c. high temperature and low pressure
d. high temperature and pressure
Answer  Explanation 

ANSWER: high temperature and pressure

Explanation:
No explanation is available for this question!


19)   The melting point of ice is

a. 0 °C
b. 1 °C
c. 100 °C
d. 50 °C
Answer  Explanation 

ANSWER: 0 °C

Explanation:
No explanation is available for this question!


20)   When heat is provided to particles of solids, they gain

a. heat energy
b. potential energy
c. kinetic energy
d. thermal energy
Answer  Explanation 

ANSWER: kinetic energy

Explanation:
No explanation is available for this question!