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Q:

Work done in a free expansion process is

A) Minimun B) 0
C) Maximum D) None of the above
 
Answer & Explanation Answer: B) 0

Explanation:

No work done as there is no external external pressure in free expansion. 

 

Hence, Work done in a free expansion process is Zero.

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Filed Under: Physics
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Q:

three_resistors_are_arranged_in_a_circuit_as_shown_above1559105724.PNG image

Three resistors are arranged in a circuit as shown above. The battery has an unknown but constant emf ε and a negligible internal resistance.

Now, determine the equivalent resistance of the three resistors.

A) 12 Ω B) 10 Ω
C) 16 Ω D) 15 Ω
 
Answer & Explanation Answer: A) 12 Ω

Explanation:

From the given circuit,

three_resistors_are_arranged_in_a_circuit_as_shown_above1559105964.PNG image

The resistors R1 and R2 are in parallel connection and R3 is in series with R1 & R2

The equivalent resistance of R1 and R2 is

Req = (12 × 4)/(12 + 4) = 3 Ω.

Adding R3 in series with the pair gives

R = Req + 9

R = 3 + 9

R = 12 Ω.

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Filed Under: Physics
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Q:

Which material provides warmth even when wet?

A) Cotton B) Wool
C) Nylon D) Silk
 
Answer & Explanation Answer: B) Wool

Explanation:
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Filed Under: General Awareness
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Q:

Which statement correctly describes the role of chance in evolution?

A) An allele that increases evolutionary fitness cannot be lost from a population by chance events. B) The ultimate source of new alleles is mutation, random changes in the nucleotide sequences of an organism's DNA
C) Evolutionary change proceeds by an accumulation of changes that occur by chance. D) None of the above
 
Answer & Explanation Answer: B) The ultimate source of new alleles is mutation, random changes in the nucleotide sequences of an organism's DNA

Explanation:
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Filed Under: Biology
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Q:

Kaolin is chemically classified as

A) Argillaceous rock B) Silicious rock
C) Metamorphic rock D) Calcareous rock
 
Answer & Explanation Answer: A) Argillaceous rock

Explanation:

Kaolin is chemically classified as Argillaceous rock.

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Filed Under: Chemistry
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Q:

The ancient goal of astrology was to 

A) make a more accurate model of the universe B) predict human events
C) understand the origin of Earth D) predict the passing of the seasons
 
Answer & Explanation Answer: B) predict human events

Explanation:

The ancient goal of astrology was to predict human events.

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Filed Under: Indian History
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Q:

The International Court of Justice was established in the year

A) 1947 B) 1946
C) 1950 D) 1948
 
Answer & Explanation Answer: B) 1946

Explanation:
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Filed Under: World Organisations

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Q:

Which among the following forms of precipitation is different from the rest?

A) dew B) fog
C) mist D) hail
 
Answer & Explanation Answer: D) hail

Explanation:

While dew , fog and mist are formed due to condensation of vapour into water drops, hail falls from the clouds in the form of hard pellets of ice.

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Filed Under: World Geography

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