In night, when photosynthesis is stopped, plants_____?

A: give off Oxygen

B: take in Carbon Dioxide

C: give off Carbon Dioxide

D: None of these

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give off Carbon Dioxide

Cow milk is a rich source of_______?

A:  vitamin B

B: vitamin C

C:  vitamin A

D:  vitamin K

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 vitamin A

The time taken by Sun to revolve around the center of our galaxy is______?

A: 250 million years

B: 150 million years

C: 300 millon years

D: 350 millon years

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250 million years

Which of the following is the most toxic gas?

A: Carbon monoxide

B: Carbon dioxide

C: Nitrogen

D: Hydrogen

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Carbon monoxide

What happens to a person who receives the wrong type of blood?

A: All the arteries dialates

B: All the arteries constrict

C: The RBCs agglutinate

D: The spleen and lymphnodes deteriorate

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The RBCs agglutinate

Chemically finger nails are made up of _______?

A: Fats

B: Carbohydrate

C: protein

D: Starch

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protein

The Beta particles are fast moving______?

A: Electrons

B: Protons

C: Neutrons

D: None

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Electrons

Central Color of Rainbow is_____?

A: Green

B: Blue

C: Red

D: Indigo

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Green

When sound waves travel from air to water which of the following quantities remains unchanged?

A: Frequency

B: Speed

C: Intensity

D: Wavelength

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Frequency

Radioactivity was discovered by _____?

A: Thomson

B: Kelvin

C: Rutherford

D: Bacquerel

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Bacquerel

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