The atmospheric greenhouse effect is produced mainly by the ________?

A: Absorption and re-emission of ultraviolet radiation by the atmosphere

B: Absorption and re-emission of visible light by the atmosphere

C: Absorption and re-emission of infrared radiation by the atmosphere

D: Absorption and re-emission of visible light by clouds

E: Absorption and re-emission of visible light by the ground

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Absorption and re-emission of infrared radiation by the atmosphere

Pig iron is also called___?

A: Steel

B: Cast iron

C: Wrought iron

D: Stainless steel

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Cast iron

Chronometer is invented by___?

A: Nikola Tesla

B: Robert Fulton

C: Martin Cooper

D: John Harrison

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John Harrison

Red blood cells are produced in____?

A: Heart

B: Liver

C: Spleen

D: Bone-marrow

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Bone-marrow

Chemical formula for Water is __ ?

A: H2O

B: NaAlO2

C: Al2O3

D: CaSiO3

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H2O

Which of the following pollutants in water causes “Minamata disease?

A: Lead

B: Methyl Mercury

C: Salmonella

D: Perchlorate

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Methyl Mercury

Bats can also fly in dark because they are capable of taking the help of ____?

A: Ultrasonic Waves

B: Ultraviolet Waves

C: Electromagnetic Waves

D: Special Retina

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Ultrasonic Waves

According to the definition of 1 KWh, a 100 watt bulb consumes one unit of electricity in____?

A: 5 hours

B: 2 hours

C: 8 hours

D: 10 hours

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10 hours

Monsoon is caused by__________?

A: Revolution of earth

B: Seasonal reversal of winds

C: Movement of clouds

D: Rise in temperature

E: Rain forests

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Seasonal reversal of winds

The cracking sound heard when dry hair is combed with a hard rubber comb is due to____?

A: Small electric sparks

B: The hair barging against the charged comb

C: The rubbing of the comb with the hair

D: None of the above

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Small electric sparks

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