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Q:

The radius of curvature of a concave mirror is 30 cm. Following Cartesian Sign Convention, its focal length is expressed as

A) -30 cm B) -15 cm
C) +30 cm D) +15 cm
 
Answer & Explanation Answer: B) -15 cm

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Q:

In the following question, some part of the sentence may have errors. Find out which part of the sentence has an error and select the appropriate option. If a sentence is free from error, select 'No Error'.

 

Mohan wishes (A)/ he will be (B)/ richer. (C)/ No Error (D)

 

A) A B) B
C) C D) D
 
Answer & Explanation Answer: B) B

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Q:

In the following question, four words are given out of which one word is correctly spelt. Select the correctly spelt word.

A) consenssus B) concensus
C) concenssus D) consensus
 
Answer & Explanation Answer: D) consensus

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Q:

Macroeconomics can best be described as the

A) analysis of how a consumer tries to spend income. B) analysis of how firms attempt to maximize their profits.
C) study of how supply and demand determine prices in individual markets. D) study of the large aggregates of the economy or the economy as a whole.
 
Answer & Explanation Answer: D) study of the large aggregates of the economy or the economy as a whole.

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Q:

Which of the following statement is INCORRECT regarding Sodium?

A) Sodium reacts vigorously with oxygen and water B) A lot of heat is generated when sodium reacts with water and oxygen
C) It is stored in kerosene D) It is a non-metal
 
Answer & Explanation Answer: D) It is a non-metal

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Q:

Pentane has _____ structural isomers.

A) 1 B) 2
C) 3 D) 4
 
Answer & Explanation Answer: C) 3

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Q:

Which of the following are highly compressible?

A) Solid B) Liquid
C) Gas D) Solid and Liquid
 
Answer & Explanation Answer: C) Gas

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Q:

Sunspots appear dark because they are

A) hotter than the rest of the Sun's surface. B) more magnetic than the rest of the Sun's surface. 
C) cooler than the rest of the Sun's surface. D) None of the above
 
Answer & Explanation Answer: C) cooler than the rest of the Sun's surface.

Explanation:

Sunspots are a magnetic phenomenon on the Sun.

The reason a sunspot appears dark is that they are cooler than the rest of the Sun's surface and also the gas inside the spot where the magnetic field is strongest is only emitting about 1/4 as much light as from the rest of the solar surface. 

 

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