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Q:

One nanometer is

 

A) 10-11 m B) 10-10 m
C) 10-8 m D) 10-9 m
 
Answer & Explanation Answer: D) 10-9 m

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Q:

We obtain average _____________ by dividing the total energy consumed by the total time taken.

 

A) force B) power
C) torque D) momentum
 
Answer & Explanation Answer: B) power

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Q:

The rate of change of linear momentum of a body falling freely under gravity is equal to it's ____ ?

A) Kinetic Energy B) Weight
C) Potential Energy D) Impulse
 
Answer & Explanation Answer: B) Weight

Explanation:

Rate of change of impulse equals the force . In case of freely falling body the only force is the weight.

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63 16461
Q:

Which of the following is false?

 

Sound waves are ___ waves.

 

A) Pressure B) Longitudinal
C) Electromagnetic D) Mechanical
 
Answer & Explanation Answer: C) Electromagnetic

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Q:

The speed of sound in air at 0°is

 

A) 331 m/s B) 330 m/s
C) 330 ms D) 331 ms
 
Answer & Explanation Answer: A) 331 m/s

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Q:

Which is best used as a sound absorbing material in partition walls ?

A) Stone chips B) Steel
C) Glass - wool D) Glass pieces
 
Answer & Explanation Answer: C) Glass - wool

Explanation:

Materials that do not transfer mechanical energy well. These tend to be soft,flexible, low density, and with high surface area to linear area ratios.

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Q:

Generally atomic radius is measured in which unit?

 

A) Fermi B) Millimeter
C) Angstrom D) Micrometer
 
Answer & Explanation Answer: C) Angstrom

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Q:

____ is not a type of heat transfer.

 

A) Diffusion B) Reflection
C) Convection D) Radiation
 
Answer & Explanation Answer: B) Reflection

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