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Q:

Water has maximum density at............

A) 0 C B) -15 C
C) 4 C D) 15 C
 
Answer & Explanation Answer: C) 4 C

Explanation:
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Q:

Fish and other aquatic creatures can live inside a deep frozen pond because 

A) fish are cold-blooded animals B) ice is a bad conductor of heat
C) there will always be water just beneath the ice level D) they can adapt themselves to live in ice
 
Answer & Explanation Answer: C) there will always be water just beneath the ice level

Explanation:

Water has the maximum density at 4oC. So at this temperature, it sinks down to bottom and stays here. If it cools further, it will become less dense and move up. So while the upper layers can cool enough to form ice, the bottom layers remain as water at  4oC .  

Therefore, (C) is correct.

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20 5835
Q:

Which of the following is not a transverse wave?

A) Light waves B) Radio waves
C) Sound waves D) All the above
 
Answer & Explanation Answer: C) Sound waves

Explanation:
Light and Radio waves are both different frequency/wavelengths of electromagnetic radiation, which consists of two components electric and magnetic of perpendicular, transverse waves. 

 
Sound, on the other hand, is a longitudinal wave which oscillates parallel to it's medium (back and forth instead of up and down).
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14 5832
Q:

Why does'nt the hydrogen atom emit X-rays?

A) It is very small in size B) It has only one electron
C) Its energy levels are very close to each other D) it is highly electropositive
 
Answer & Explanation Answer: C) Its energy levels are very close to each other

Explanation:

For an atom to emit X-rays it should have difference in energy levels

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9 5821
Q:

The heat from the sun reaches earth through Convection.

A) TRUE B) FALSE
Answer & Explanation Answer: B) FALSE

Explanation:

The given statement, The heat from the sun reaches earth through Convection is FALSE.


 


Heat from the sun actually reaches the earth through Radiation. The process occurs through electromagnetic radiation, specifically, in which molecules are warmed when the heat reaches them, and these molecules then warm other molecules touching them, which continues until we feel the sun's heat.

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8 5797
Q:

Light year is a unit of

A) time B) speed of light
C) distance D) mass
 
Answer & Explanation Answer: C) distance

Explanation:
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10 5786
Q:

When white light passes through a glass prism we get a spectrum on the other side of the prism. In the emergent beam the ray which is deviated least is

A) the violet ray B) the red ray
C) the green ray D) the blue ray
 
Answer & Explanation Answer: B) the red ray

Explanation:

Red is deviated the least and violet the most

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14 5781
Q:

On the Kelvin scale ,the melting point of ice is

A) 373K B) 100K
C) 273K D) 0 K
 
Answer & Explanation Answer: C) 273K

Explanation:
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12 5748