Q:

Molecular clocks are based on the idea that _____.

A) On average neutral mutations arise at a constant rate	B) Directional selection occurs at a constant rate
C) Mutations occur once every generation	D) Molecules resonate at a certain frequency that can be measured

Answer & Explanation Answer: C) Mutations occur once every generation

Explanation:

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Q:

Look at the underlined part of each sentence. Below each sentence are given three possible substitutions for the underlined part. If one of them (a), (b) or (c) is better than the underlined part, indicate your response on the Answer Sheet against the corresponding letter. If none of the substitutions imporves the sentence, indicate (d) as your response on the Answer Sheet.

It is hard these days to cope with the rising prices

A) cope by	B) cope up with
C) to be coped with	D) No improvement

Answer & Explanation Answer: D) No improvement

Explanation:

No improvement is required. The verb cope means to deal with. Cope when followed by the preposition with, it means to deal with some difficulty. Also, the sentence is in simple present tense. The sentence is correct.

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Q:

How many groups and periods are present in the Modern Periodic Table?

A) 9 groups, 9 periods	B) 7 groups, 8 periods
C) 18 groups, 7 periods	D) 8 groups, 7 periods

Answer & Explanation Answer: C) 18 groups, 7 periods

Explanation:

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Q:

Which of the following reproduce both, sexually as well as asexually?

A) Hydra	B) Amoeba
C) ALgae	D) Fungi

Answer & Explanation Answer: A) Hydra

Explanation:

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Q:

____ tissue changes the diameter of a blood vessel.

A) Heart	B) Muscle
C) Epithelial	D) Bone

Answer & Explanation Answer: B) Muscle

Explanation:

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Q:

What is the pH value of human blood?

A) 8.3	B) 6.8
C) 7.4	D) 6

Answer & Explanation Answer: C) 7.4

Explanation:

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Q:

What is the reason for formation of Mirage in desert?

A) Refraction of light	B) Reflection of light
C) Total internal reflection of light	D) Both Refraction and Total internal reflection of light

Answer & Explanation Answer: D) Both Refraction and Total internal reflection of light

Explanation:

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Filed Under: Physics
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Q:

Which of the following is a Non-Luminous body?

A) Glowing bulb	B) Moon
C) Burning candle	D) Firefly

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