Q:

To keep warm, polar bears have a layer of ________ under their skin.

A) muscle	B) fat
C) cartilage	D) hair

Answer & Explanation Answer: B) fat

Explanation:

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Q:

An electric iron of 750 W is used for S hours per day. Then the energy consumed in one day by the iron is:

A) 6 units	B) 600 units
C) 0.6 units	D) 60 units

Answer & Explanation Answer: A) 6 units

Explanation:

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Q:

By definition a clade is

A) monophyletic	B) polyphyletic
C) parsimonious	D) paraphyletic

Answer & Explanation Answer: A) monophyletic

Explanation:

A clade is a group of ancestral species and all its descendants. Hence it is a branch of one same species and so monophyletic.

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Q:

Covalent bonds are formed when electrons are

A) Transfer of electrons	B) Sharing of electrons
C) Dividing of electrons	D) All of the above

Answer & Explanation Answer: B) Sharing of electrons

Explanation:

Covalent bonding occurs when pairs of electrons are shared by atoms. Atoms will covalently bond with other atoms in order to gain more stability, which is gained by forming a full electron shell. By sharing their outer most (valence) electrons, atoms can fill up their outer electron shell and gain stability.

Examples of compounds with covalent bonds ::

HCl, CO2, O2,...

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Q:

What happens to electrons in an ionic bond?

A) collision of electrons	B) Sharing of electrons
C) Both A & B	D) Transfer of electrons

Answer & Explanation Answer: D) Transfer of electrons

Explanation:

An ionic bond is formed between two molecules when transfer of valency electrons take place between them.

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Q:

Which of the following compounds from nitrites with nitrous acid?

A) Primary amines	B) Secondary amines
C) Tertiary amines	D) All of these

Answer & Explanation Answer: D) All of these

Explanation:

The acid and the nitrite form nitrous acid which then reacts with the amine.

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Q:

Which of the following cells produce antibodies?

A) Plasma cells	B) Monocytes
C) Mast cells	D) Neutrophils

Answer & Explanation Answer: A) Plasma cells

Explanation:

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Filed Under: Biology
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Q:

In the following question, out of the four alternatives, select the word opposite in meaning to the word given.

Naive

A) Artful	B) Candid
C) Credulous	D) Sincere

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