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 Physics Questions

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Q:

Temperature of distant luminous bodies can be determined by

A) Mercury thermometers B) Gas thermometers
C) Pyrometers D) Colour thermometers
 
Answer & Explanation Answer: C) Pyrometers

Explanation:
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1 1732
Q:

The strength of a force is usually expressed by its __________.

A) Motion B) Direction
C) Interaction D) Magnitude
 
Answer & Explanation Answer: D) Magnitude

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1 1728
Q:

Which of the following has the lowest frequency?

A) Visible light B) Gamma rays
C) X­-rays D) Ultra violet rays
 
Answer & Explanation Answer: A) Visible light

Explanation:
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0 1727
Q:

If there were no gravity, which of the following will not be there for a fluid?

A) Viscosity B) Surface Tension
C) Pressure D) Upward Thrust
 
Answer & Explanation Answer: D) Upward Thrust

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0 1722
Q:

What is the resistance (in ohm) of an electrical component if a current of 0.1 A passes through it on application of 5 V of potential difference across it?

A) 0.5 B) 100
C) 50 D) 1
 
Answer & Explanation Answer: C) 50

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0 1721
Q:

What type of heat transfer is boiling water?

A) radiation B) conduction
C) convection D) None of the above
 
Answer & Explanation Answer: C) convection

Explanation:

Convection is by far the most efficient and common way for heat to be transferred through liquids and gases. It occurs when some regions of a fluid get hotter than others, causing currents in the fluid that move it around to distribute that heat more evenly.

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3 1720
Q:

Materials that usually are good conductors of electricity?

A) Aluminium B) Lead
C) Nickel D) Wood
 
Answer & Explanation Answer: A) Aluminium

Explanation:

Materials that usually allow electricity to pass through them are called Good conductors of electricity.


Conductors conduct electrical current very easily because of their free electrons.

Examples are :: Aluminium, Gold, Copper, Silver

 

Materials that do not allow or oppose electrical current & make poor conductors are called Insulators.

Examples are :: Glass, Plastic, Wood, Air,...

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5 1718
Q:

A body of 4.0 kg is lying at rest. Under the action of a constant force, it gains a speed of 5 m/s. The work done by the force will be____.

A) 50J B) 30J
C) 20J D) 40J
 
Answer & Explanation Answer: A) 50J

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0 1714