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 Physics Questions

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Q:

A 4 kg object is moving horizontally with a speed of 5 m/s. To increase its speed to 10 m/s, the amount of net work required to be done on this object is:

A) 150 J B) 100 J
C) 50 J D) 75 J
 
Answer & Explanation Answer: A) 150 J

Explanation:
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Q:

Which color has the highest energy?

A) Violet B) Red
C) Blue D) White
 
Answer & Explanation Answer: A) Violet

Explanation:

Violet colour has the highest energy. The higher the frequency, the faster the oscillations and thus the higher the energy. Therefore, the highest-frequency ultra-violet light or the lowest wavelength is violet.

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Q:

Electric charges that are different attract each other.

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

Explanation:

Same charges will repel each other and the charges that are different will attract each other.


Electric_charges_that_are_different_attract_each_other._1545283189.png image

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Q:

Speed regulation of synchronous motor is

A) 1% B) 25%
C) Zero D) 0.5%
 
Answer & Explanation Answer: C) Zero

Explanation:

speed_regulation_of_synchronous_motor1553077296.jpg image

Synchronous motor is a motor which runs at a constant speed irrespective of load attached to it. So the speed regulation of synchronous motor is ZERO.

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Q:

Exerts a force on anything that has an electric charge

A) Electric field B) Electrostatic force
C) Inductive field D) All of the above
 
Answer & Explanation Answer: A) Electric field

Explanation:
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Q:

Which physical quantity is measured in 'siemens'?

A) Electric potential B) Electrical conductance
C) Magnetic flux D) Refractive index
 
Answer & Explanation Answer: B) Electrical conductance

Explanation:
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Q:

The combined gas law relates which of the following?

A) Volume & Temperature B) Temperature & Pressure
C) Volume & Pressure D) Volume, Temperature & Pressure
 
Answer & Explanation Answer: D) Volume, Temperature & Pressure

Explanation:

The combined gas law states that the ratio between the pressure-volume product and the temperature of a system remains constant.

 

Hence it depends on all the three Volume, Temperature & Pressure.

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Q:

What factors contribute to global winds?

A) Coriolis Effect B) Convection Cells
C) Uneven warming of the earth by the sun D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

All of the factors that contribute to global winds are 

1) Uneven warming of the earth by the sun
2) Coriolis Effect
3) Convection Cells

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