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 Physics Questions

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Q:

When a constant force acts on an object with a mass of 8 kg for a duration of 3 s. it increases the object's velocity from 4 m/s to 6 m/s . What is the magnitude of the applied force?

A) 5.33 N B) 4.33 N
C) 6.33 N D) 3.33 N
 
Answer & Explanation Answer: A) 5.33 N

Explanation:
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Q:

As the object covers equal distances in equal intervals of time, it is said to be in ____________ motion.

A) uniform B) linear
C) translational D) equilibrium
 
Answer & Explanation Answer: A) uniform

Explanation:
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Q:

Which metal is the best conductor of heat?

A) Silver B) Gold
C) Copper D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

Silver is the best conductor of both heat and electricity among metals with a thermal conduction value of about 430 W/(mK).

Gold and copper both come respectably close to silver.

 

Copper being significantly less costly it is often chosen over silver in many applications.

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Q:

"When a card placed over a tumbler is flicked with the finger, the coin placed over it falls in the tumbler".

A) Law of conservation of energy B) Newton's third law of motion
C) Law of Inertia D) Law of conservation of momentum
 
Answer & Explanation Answer: C) Law of Inertia

Explanation:
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Q:

The flux commonly used in brazing is

A) Ammonium chloride B) Borax
C) Zinc chloride D) Resin plus alcohol
 
Answer & Explanation Answer: B) Borax

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:

Land is considered a resource because it

A) is used to produce things B) requires labor to be useful
C) is always available to use D) costs little or nothing to use
 
Answer & Explanation Answer: A) is used to produce things

Explanation:

Land is considered as an important resource because it is useful in producing many things. For example, in agriculture, land is used for cultivating the crop, in industrial use, it is used for constructing factories and to make products that we use.

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Q:

Work done in a free expansion process is

A) Minimun B) 0
C) Maximum D) None of the above
 
Answer & Explanation Answer: B) 0

Explanation:

No work done as there is no external external pressure in free expansion. 

 

Hence, Work done in a free expansion process is Zero.

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