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 Physics Questions

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Q:

Friction can be reduced by changing from

A) Static to Dynamic B) Rolling to Sliding
C) Dynamic to Static D) Sliding to Rolling
 
Answer & Explanation Answer: D) Sliding to Rolling

Explanation:

Any object rolls when there is no friction. So, Sliding to Rolling is correct.

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Q:

Lightning is produced when 

A) Similar charges of electricity rush towards each other and then get repelled B) clouds strike against impurities in air and the friction burns up these impurities
C) strong opposite charges in different clouds break down the resistance offered by the intervening air D) water vapour produces electricity in the clouds
 
Answer & Explanation Answer: C) strong opposite charges in different clouds break down the resistance offered by the intervening air

Explanation:

When the resistance of the air between breaks down the current flows from the positive cloud to the negative cloud in a flash which we call lightning . The difference of potential involves is very high.

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Q:

Is blood homogeneous or heterogeneous?

A) Homogeneous B) Heterogeneous
C) Both A & B D) None of the above
 
Answer & Explanation Answer: B) Heterogeneous

Explanation:

Blood is a heterogeneous mixture because the blood cells are physically separate from the blood plasma. The cells have different properties than the plasma. The cells can be separated from the plasma by centrifuging, which is a physical change.

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Q:

The energy of a photon, whose momentum is 10 MeV/c, where c is the speed of light, is given by

A) 10 MeV B) 100 MeV
C) 1 MeV D) 0.1 MeV
 
Answer & Explanation Answer: A) 10 MeV

Explanation:

A photon’s relativistic momentum is given by the equation,E = pc where p is the momentum.

P = 10 MeV/c

So, E = 10 MeV

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Q:

Scalar Quantities are

A) physical quantities which have magnitude only and no direction B) physical quantities which have no magnitude only and only direction
C) physical quantities which have magnitude only and direction D) physical quantities which have no magnitude and no direction
 
Answer & Explanation Answer: A) physical quantities which have magnitude only and no direction

Explanation:
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Q:

Second and third class levers are differentiated by

A) the location of the load B) the location of the fulcrum
C) the presence of multiple loads D) the type of fulcrum present
 
Answer & Explanation Answer: A) the location of the load

Explanation:
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Q:

What type of lens is a magnifying glass?

A) Diverging B) Spherical
C) Converging D) Achromatic
 
Answer & Explanation Answer: C) Converging

Explanation:

A magnifying glass is a convex lens that is used to produce a magnified image of an object. It is also called a hand lens in laboratory contexts.

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Q:

What is the minimum velocity required for a rocket to overcome earth's gravity and travel into space?

A) 18 km/sec B) 11.2 km/sec
C) 21 km/sec D) 35 km/sec
 
Answer & Explanation Answer: B) 11.2 km/sec

Explanation:

This 11.2 km/s is also known as the escape velocity. It works out to roughly 25000miles per hour 

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