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Q:

Cold air is ______.

A) lighter than warm air hence cold air settles down B) heavier than warm air hence cold air rises up
C) lighter than warm air hence cold air rises up   D) heavier than warm air hence cold air settles down  
 
Answer & Explanation Answer: D) heavier than warm air hence cold air settles down  

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Q:

The value of universal gravitation constant (G) was determined by

A) Henry Cavendish B) Antoine L Lavoisier
C) Isaac Newton D) John Dalton
 
Answer & Explanation Answer: A) Henry Cavendish

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Q:

If the velocity of a body is halved its kinetic energy ________________.

A) become 4 times B) becomes 1/4 th
C) is also doubled D) becomes half
 
Answer & Explanation Answer: B) becomes 1/4 th

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Q:

The material used in electric heater is

A) Tungsten B) Nichrome
C) Brass D) Steel
 
Answer & Explanation Answer: B) Nichrome

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Q:

What is the unit of resistance?

A) ohm B) farad
C) henry D) weber
 
Answer & Explanation Answer: A) ohm

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Q:

When we see an object, the image formed on the retina is ________

A) Real and inverted B) Real and erect
C) Virtual and erect D) Virtual and inverted
 
Answer & Explanation Answer: A) Real and inverted

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Q:

Which of the following device is best suited for measuring the temperature inside metallurgical furnaces?

A) Pyrometer B) Thermocouple
C) Thermometer D) Thermistor
 
Answer & Explanation Answer: A) Pyrometer

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Q:

A Sonar of a ship sends sounds waves of speed 1000 m/s. These waves are reflected back by the ocean floor in 2 seconds. Find the depth (in m) of theocean floor. 

A) 2000 B) 500
C) 1000 D) 100
 
Answer & Explanation Answer: C) 1000

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