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Q:

A wire of copper having length I and area of cross-section A is taken and a current / is flown through it. The power dissipated in the wire is P. If we take an aluminium wire having same dimensions and pass the same current through it, the power dissipated will be

A) P B) < P
C) > P D) 2P
 
Answer & Explanation Answer: C) > P

Explanation:

Aluminum has a resistivity varying from 2.65 to 2.82 × 10−8 Ω m.The resistivity of copper is generally given as: 1.72 x 10-8 Ω.m.So, since resistivity of aluminium is higher than that of copper, so Power dissipated will be greater than P. this is because rest of the factors (l, A and i) are constant.

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Filed Under: Physics
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Q:

To resolve an object in an electron microscope,

A) the wavelength of the electrons must be close to the diameter of the object B) the wavelength of the electrons must be greater than the diameter of the object.
C) Both A & B D) None of the above
 
Answer & Explanation Answer: A) the wavelength of the electrons must be close to the diameter of the object

Explanation:
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Filed Under: Physics
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Q:

A hinterland is 

A) an area behind a seaport that supplies the bulk of the exports B) the interior of a valley
C) an elevated area D) an area occupied by backward community
 
Answer & Explanation Answer: A) an area behind a seaport that supplies the bulk of the exports

Explanation:

It is also the land that accommodates the imports of the port.

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Filed Under: World Geography

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Q:

Marketing refers to -

A) Execution of sales B) Planning sales campaigns
C) Advertising and promotions D) Philosophy that stresses customer value and satisfaction
 
Answer & Explanation Answer: D) Philosophy that stresses customer value and satisfaction

Explanation:
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Filed Under: Marketing and Sales

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Q:

What can you break but not touch?

A) Mirror B) Word
C) Promise D) All of the above
 
Answer & Explanation Answer: C) Promise

Explanation:

A promise. 

 

The Promise made to somebody by you can be break but you cannot touch it.

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Filed Under: Word Puzzles
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Q:

The world's largest rock is regarded as sacred by the Aborgines . What is it called?

Answer

Ayer's Rock

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Subject: General Awareness

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Q:

What is it called when you can't hear?

A) Deaf B) Dumb
C) Mute D) Blind
 
Answer & Explanation Answer: A) Deaf

Explanation:

When you can't hear it is called as Deaf.

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Filed Under: General Science
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Q:

The speed of a boat when travelling downstream is 32 km/h, whereas when travelling upstream it is 28 km/h. What is the speed of the boat in still water?

A) 27 km/h B) 29 km/h
C) 31 km/h D) Cannot be determined
 
Answer & Explanation Answer:

Explanation:

Ans.  Suppose the speed of boat in still water is x km/h and speed of stream is y km/h

Speedof boat in downstream = (x + y) km/h x+ y = 32 …(i) 

Speed of boat in upstream = (x – y) km/h

x – y = 28 …(ii)

Add. Eqs. (i) and (ii), we get 2x = 60

x = 30 km/h

 

 

 

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Filed Under: English
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