CBSE Class 8 Science Multiple Choice Questions(MCQs) with Answers

Questions

61 Flow of electron is called

A Electroplating

B Electric current

C Electrodes

D Electrolyte

View Answer

Answer: Electric current

62 Distilled water is

A Poor conductor

B Good conductor

C Both A and B

D None

View Answer

Answer: Poor conductor

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63 Poor conductors are

A Plastics

B Clothes

C Wood

D All of these

View Answer

Answer: All of these

64 Copper wire is a

A Good conductor

B Poor conductor

C Both A and B

D None of this

View Answer

Answer: Good conductor

65 An electrolyte is

A a metal

B a solution

C a liquid that conducts current

D all of above

View Answer

Answer: a liquid that conducts current

66 Adding common salt to distilled water makes it

A Good conductor

B Insulator

C No

D Both a and b

View Answer

Answer: Good conductor

67 Electroplating is based on

A Magnetic effect of electricity

B Chemical effect of electricity

C Heating effect of electricity

D Physical effect of electricity

View Answer

Answer: Chemical effect of electricity

68 Plastic wire is

A An insulator

B A conductor

C Both of these

D None of these

View Answer

Answer: An insulator

69 Which substance give heat and light after combustion

A Flame

B Fuel

C Combustion

D None of these

View Answer

Answer: Fuel

70 Like fuel the sun also provides heat and light. The process taking place in the sun is called

A Combustion

B Nuclear process

C Burning

D All of these

View Answer

Answer: Nuclear process

71 Coal burns with ______

A Flame

B Only glow

C Both flame and glow

D None of these

View Answer

Answer: Only glow

72 Burning of charcoal in a closed room will produce

A Carbon dioxide

B Nitrogen dioxide

C Carbon monoxide

D All of these

View Answer

Answer: Carbon monoxide

73 The substances which have very low ignition temperature will

A Catch fire easily

B Will not catch fire

C Catch fire after some time

D None of these

View Answer

Answer: Catch fire easily

74 CNG and LPG are the examples of

A Solid fuels

B Liquid fuels

C Gaseous fuels

D They are not fuels

View Answer

Answer: Gaseous fuels

75 Ignition temperature is

A Lowest temperature at catch fire

B Higher temperature at catch fire

C Any temperature

D None of these

View Answer

Answer: Lowest temperature at catch fire

76 Combustion is a

A Chemical process

B Physical process

C Both of these processes

D None of these processes

View Answer

Answer: Chemical process

77 The products of combustion are

A Oxygen and water

B Carbon dioxide and water

C Only carbon dioxide

D Only oxygen

View Answer

Answer: Carbon dioxide and water

78 There are following zones of a flame

A Two

B Three

C Four

D No any zone

View Answer

Answer: No any zone

79 Leaves or fruits fall on the ground due to

A magnetic force

B gravitational force

C electrostatic force

D muscular force

View Answer

Answer: gravitational force

80 Force acts on an object may change

A direction

B shape

C speed

D all of above

View Answer

Answer: all of above

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