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 Physics Questions

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Q:

An object with a constant speed

A) is not accelerated B) might be accelerated
C) is always accelerated D) also has a constant velocity
 
Answer & Explanation Answer: B) might be accelerated

Explanation:
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Q:

Which of the following is a scalar quantity

A) Displacement B) Electric field
C) Acceleration D) work
 
Answer & Explanation Answer: D) work

Explanation:
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Q:

A Fuse is used in mains electric supply as a safety devices. Which one of the following statements about the fuse is correct?

A) It is connected in parallel with the main switch B) It is made mainly from silver alloys
C) It must have a low melting point D) It must have a very high resistance
 
Answer & Explanation Answer: C) It must have a low melting point

Explanation:
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Q:

A machine powered by rotating blades is a

A) Fumerole B) Turbines
C) Solar panel D) None of the above
 
Answer & Explanation Answer: B) Turbines

Explanation:

Turbines are machines powered by rotating blades.

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Q:

In a vacuum, all electromagnetic waves have the same

A) Velocity B) Wavelenth
C) Frequency D) All the above
 
Answer & Explanation Answer: A) Velocity

Explanation:

When traveling in a vacuum, electronic waves from the electromagnetic spectrum all travel at the same speed. Velocity is speed with direction, so they would all travel at the same velocity, realtively speaking. But frequency and wavelength are quite different.

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Q:

A capillary tube is partially dipped vertically in a vessel containing water. Due to capillarity  water rises in the tube. The height of water rise in the tube can be increased by 

A) decreasing the radius of the capillary tube B) increasing the radius of the capillary tube
C) increasing the height of water in the vessel D) None of these
 
Answer & Explanation Answer: A) decreasing the radius of the capillary tube

Explanation:

The water rise in a capillary tube dipped in water is such that the weight of water in the tube above the surface of water in the vessel is equal to (balances) the upward force due to surface tension. So it is clear that if the the bore (radius) to the tube is decreased, the height of the water column in it must be greater.  So, (a) is correct.

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Q:

A balloon filled with hydrogen will

A) continue going upwards uninterrupted B) reach a particular height and remain floating
C) burst after reaching some height D) reach a particular height and start coming down
 
Answer & Explanation Answer: B) reach a particular height and remain floating

Explanation:

It will stop at a height where the weight of the balloon with contents is equal to the weight of air displaced by it, i.e , when the upthrust is equal to the downthrust. The question of bursting will depend on how much difference of pressure inside and outside , the material of the balloon can withstand. It is assumed the balloon is filled with a lighter than air gas like hydrogen or helium.

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Q:

Where does hydroelectric energy come from?

A) Air B) Water
C) Solar D) All of the above
 
Answer & Explanation Answer: B) Water

Explanation:

Hydroelectricity is electricity produced from hydropower i.e, water.

Where_does_hydroelectric_energy_come_from1536043070.jpg image

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