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Free download in PDF CBSE Class 8 Science Multiple Choice Questions(MCQs) with Answers. Here Gkseries provide Science Solve Questions and Answers for CBSE class 8 Students.
61
Flow of electron is called
[A]
Electroplating
[B]
Electric current
[C]
Electrodes
[D]
Electrolyte
62
Distilled water is
[A]
Poor conductor
[B]
Good conductor
[C]
Both A and B
[D]
None
63
Poor conductors are
[A]
Plastics
[B]
Clothes
[C]
Wood
[D]
All of these
64
Copper wire is a
[A]
Good conductor
[B]
Poor conductor
[C]
Both A and B
[D]
None of this
65
An electrolyte is
[A]
a metal
[B]
a solution
[C]
a liquid that conducts current
[D]
all of above
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
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
Answer: Chemical effect of electricity
68
Plastic wire is
[A]
An insulator
[B]
A conductor
[C]
Both of these
[D]
None of these
69
Which substance give heat and light after combustion
[A]
Flame
[B]
Fuel
[C]
Combustion
[D]
None of these
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
71
Coal burns with ______
[A]
Flame
[B]
Only glow
[C]
Both flame and glow
[D]
None of these
72
Burning of charcoal in a closed room will produce
[A]
Carbon dioxide
[B]
Nitrogen dioxide
[C]
Carbon monoxide
[D]
All of these
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
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
75
Ignition temperature is
[A]
Lowest temperature at catch fire
[B]
Higher temperature at catch fire
[C]
Any temperature
[D]
None of these
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
77
The products of combustion are
[A]
Oxygen and water
[B]
Carbon dioxide and water
[C]
Only carbon dioxide
[D]
Only oxygen
Answer: Carbon dioxide and water
78
There are following zones of a flame
[A]
Two
[B]
Three
[C]
Four
[D]
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
Answer: gravitational force
80
Force acts on an object may change
[A]
direction
[B]
shape
[C]
speed
[D]
all of above
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