Q:

The vast amount of sea weeds present in oceans may produce an endless source of

A) Methane	B) Ocean thermal energy
C) Sea wave energy	D) Nuclear energy

Answer & Explanation Answer: A) Methane

Explanation:

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Q:

Valency of an element depends on which of the following?

I. Number of losing electron

II. Number of gaining electron

III. Number of sharing electron

A) Only I and II	B) Only I and III
C) Only II and III	D) All I, II and III

Answer & Explanation Answer: D) All I, II and III

Explanation:

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Q:

The gravitational force of attraction between two bodies is ____________________ the distance between the two bodies.

A) inversely proportional to the	B) directly proportional to the square of
C) inversely proportional to the square of	D) directly proportional to the

Answer & Explanation Answer: C) inversely proportional to the square of

Explanation:

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Q:

What is the position of metallic ion and non-metallic ion in a chemical formula?

A) Metal ion at second position	B) Non-metal ion at first position
C) Metal ion at first and non-metal ion at second position	D) No option is correct

Answer & Explanation Answer: C) Metal ion at first and non-metal ion at second position

Explanation:

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Q:

An electron loses potential energy when it

A) shifts to a more electronegative atom.	B) increases its kinetic energy.
C) shifts to a less electronegative atom.	D) increases its activity as an oxidizing agent.

Answer & Explanation Answer: A) shifts to a more electronegative atom.

Explanation:

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Q:

What is the basis of classifying various plant tissues as meristematic tissue and permanent tissue?

A) Size	B) Dividing capacity
C) Location	D) No option is correct

Answer & Explanation Answer: B) Dividing capacity

Explanation:

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Q:

Which of the following substances cause temporary hardness in water?

1. Mg(HCO3)2

2. Ca(HCO3)2

3. CaCl2

4. MgSO4

A) 3 and 4	B) 2and 3
C) 1 and 4	D) 1 and 2

Answer & Explanation Answer: D) 1 and 2

Explanation:

There are two types of water hardness: temporary and permanent hardness. Temporary hardness is due to the presence of calcium hydrogen carbonate Ca(HCO3)2(aq) and magnesium hydrogen carbonate Mg(HCO3)2(aq).

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Q:

Plaster of Paris ______.

I. changes into gypsum on mixing with water

II. is CaSO4.2H2O

III. is used for decoration

A) Only I and II	B) Only I and III
C) Only II and III	D) All I, II and III

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