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Q:

A mass of 20 kg is at a height of 8 m above the ground. Then the potential energy possessed by the bodyis: [Given g = 9.8 m/s]

A) 1568 J B) 1568 C
C) 1568 W D) 1568 N
 
Answer & Explanation Answer: A) 1568 J

Explanation:
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Q:

In beta decay what is emitted

A) electron B) proton
C) neutron D) All of the above
 
Answer & Explanation Answer: A) electron

Explanation:
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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:

What is the heat generated (in J) in a heating element of resistance 900 Ω when a current of 0.3 A passes through it for 10 seconds?

A) 2700 B) 810
C) 405 D) 1350
 
Answer & Explanation Answer: B) 810

Explanation:
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Q:

What property of matter is momentum related to?

A) mass B) velocity
C) Both A & B D) None of the above
 
Answer & Explanation Answer: C) Both A & B

Explanation:

At any given speed, momentum is directly proportional to mass of an object.

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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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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:

Middle latitude cyclones are fueled by? 

A) air high in the atmosphere B) polar continental air masses
C) energy from falling precipitation D) All of the above
 
Answer & Explanation Answer: A) air high in the atmosphere

Explanation:

Extratropical cyclones, sometimes called mid-latitude cyclones or wave cyclones, are low-pressure areas which, along with the anticyclones of high-pressure areas, drive the weather over much of the Earth.

 

Middle latitude cyclones are fueled by air high in the atmosphere.

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