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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:

Quantitatively, the inertia of an object is measured by ______________.

 

A) its weight B) the product of its mass and velocity
C) its mass D) the product of its mass and acceleration
 
Answer & Explanation Answer: C) its mass

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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:

A boy raises a box with a weight of 120N through a height of 2 m. The work done by him is

 

A) 60 J B) 120 J
C) 240 J D) 180 J
 
Answer & Explanation Answer: C) 240 J

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Q:

Mechanical energy is the combination of kinetic energy and

 

A) Heat energy B) Chemical energy
C) Potential energy D) Nuclear energy
 
Answer & Explanation Answer: C) Potential energy

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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:

Which statement best describes the formation of diamonds?

 

A) Diamonds form in talc under very high pressure. B) Diamonds form in kimberlites under very high pressure.
C) Diamonds form in kimberlites under very low pressure. D) Diamonds form in talc under very low pressure.
 
Answer & Explanation Answer: B) Diamonds form in kimberlites under very high pressure.

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Q:

The most suitable unit for expressing nuclear radius is

A) micro B) nanometre
C) fermi D) angstrom
 
Answer & Explanation Answer: C) fermi

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