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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

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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

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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

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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  

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Q:

Select the missing term based on the given related pair.

 

 

 

A) Larva B) Caterpillar
C) Kitten D) Child
 
Answer & Explanation Answer: B) Caterpillar

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Q:

By virtue of which Act, Diarchy was introduced in India

A) Indian Council Act, 1909 B) Government of India Act, 1919
C) Government of India Act, 1935 D) indian Independence Act, 1947
 
Answer & Explanation Answer: B) Government of India Act, 1919

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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

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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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