CBSE Class 8 Science Objective Type Questions with Answers

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121 The percentage of nitrogen is

[A] 21%

[B] 78%

[C] 12%

[D] 87%

Answer: 78%

122 Green House gas is

[A] Nitrogen

[B] Oxygen

[C] Methane

[D] Carbon dioxide

Answer: Carbon dioxide

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123 Air pollution causes

[A] Global warming

[B] Respiratory problems

[C] Soil erosion

[D] None of these

Answer: Respiratory problems

124 Most polluted river in the world is

[A] Yamuna

[B] Cavery

[C] Chenab

[D] Ganga

Answer: Ganga

125 The Taj Mahal is being affected by

[A] Noise pollution

[B] Air pollution

[C] Water pollution

[D] None of these

Answer: Air pollution

126 Highest percentage of air consists of

[A] Oxygen

[B] Carbon dioxide

[C] Nitrogen

[D] Argon

Answer: Nitrogen

127 Leaves or fruits fall on the ground due to

[A] magnetic force

[B] gravitational force

[C] electrostatic force

[D] muscular force

Answer: gravitational force

128 The force between two charged bodies is called

[A] muscular force

[B] gravitational force

[C] magnetic force

[D] electrostatic force

Answer: electrostatic force

129 The strength of force is expressed by?

[A] weight

[B] mass

[C] magnitude

[D] longitudinal force

Answer: magnitude

130 What is force?

[A] pull

[B] push

[C] push and push both

[D] none of these

Answer: push and push both

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