Subject: Bio - Chemistry

#41

Which substance turns blue litmus red?

A) Salt

B) Base

C) Acid

D) Water

Answer:   C

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#42

Which element is found in all organic compounds?

A) Hydrogen

B) Oxygen

C) Nitrogen

D) Carbon

Answer:   D

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#43

What is the pH of a basic solution?

A) Less than 7

B) Equal to 7

C) Greater than 7

D) Exactly 0

Answer:   C

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#44

Which of the following is a noble gas?

A) Oxygen

B) Nitrogen

C) Helium

D) Hydrogen

Answer:   C

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#45

Which type of bond is present in NaCl?

A) Covalent

B) Hydrogen

C) Ionic

D) Metallic

Answer:   C

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#46

Which gas is evolved during respiration?

A) Oxygen

B) Nitrogen

C) Carbon dioxide

D) Hydrogen

Answer:   C

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#47

Which of the following is used to test for the presence of proteins?

A) Benedict’s solution

B) Biuret reagent

C) Iodine solution

D) Lime water

Answer:   B

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#48

Which property is common to metals?

A) Brittle

B) Dull

C) Good conductor of electricity

D) Poor conductor of heat

Answer:   C

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