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Q:

Which one of the following cell organelles mainly functions as storehouse of digestive enzymes?

A) Desmosome B) Ribosome
C) Lysosome D) Vacuoles
 
Answer & Explanation Answer: C) Lysosome

Explanation:

Lysosome is found in nearly all types of eukaryotic cells (cells with a clearly defined nucleus) and is responsible for the digestion of macromolecules, old cell parts, and microorganisms. Each lysosome is surrounded by a membrane that maintains an acidic environment within the interior via a proton pump. Lysosomes contain a wide variety of hydrolytic enzymes (acid hydrolases) that break down macromolecules such as nucleic acids, proteins, and polysaccharides. So, they are known as storehouse of digestive enzymes.

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Q:

Which of the following elements has the lowest melting point?

A) Iodine B) Lead
C) Tin D) Mercury
 
Answer & Explanation Answer: D) Mercury

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Q:

Elements A, B and C occur as Dobereiners triads. If the atomic mass of A is 7 and that of C is 39, what will be the atomic mass of B?

A) 20 B) 40
C) 23 D) 12
 
Answer & Explanation Answer: A) 20

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Q:

Give an example of a salt which gives an aqueous solution of pH less than 7.

A) Ammonium chloride B) Sodium carbonate
C) Sodium bicarbonate D) Sodium chloride
 
Answer & Explanation Answer: A) Ammonium chloride

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Q:

Which of the following has pH value 7?

A) Pure Water B) H2SO4
C) Sodium Carbonate D) HCl
 
Answer & Explanation Answer: A) Pure Water

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Q:

The strongest interactions between molecules of hydrogen chloride are

A) dipole-dipole interactions B) hydrogen bonds
C) covalent bonds D) ionic bonds
 
Answer & Explanation Answer: A) dipole-dipole interactions

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Q:

Chemical formula for sulphurous acid is:

A) H2SO4 B) H2SO3
C) H3SO3 D) H3SO4
 
Answer & Explanation Answer: B) H2SO3

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Q:

Which one of the following is a good electrical conductor?

A) Graphite B) Diamond
C) Peat D) Charcoal
 
Answer & Explanation Answer: A) Graphite

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