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 Physics Questions

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Q:

Malleability and Ductility of metals can be accounted due to

A) the crystalline structure in metal B) the interaction of electrons with metal ions in the lattice
C) the presence of electrostatic force D) the capacity of layers of metal ions to slide over the other
 
Answer & Explanation Answer: D) the capacity of layers of metal ions to slide over the other

Explanation:
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Q:

The transport phenomenon occurs only in _____ state of a gas and is ______

A) Non-equilibrium, irreversible B) Non-equilibrium, reversible
C) equilibrium, irreversible D) equilibrium, reversible
 
Answer & Explanation Answer: C) equilibrium, irreversible

Explanation:

The transport phenomenon occurs only in equilibrium state of a gas and is irreversible.

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Q:

The pressure exerted by a 760 mm column of mercury at 0°C  is known as

A) 1 pascal B) 1 atmosphere
C) 1 bar D) 1 poise
 
Answer & Explanation Answer: B) 1 atmosphere

Explanation:

1 atm: It was originally defined as the pressure exerted by 760 mm of mercury at 0 °C and standard gravity (g = 9.80665 m/s2).

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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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2 3772
Q:

If a band is played on the moon the sound will 

A) reverberate B) be heard by us faintly
C) be heard upto 10 km from it D) not be heard at any distance at all from it
 
Answer & Explanation Answer: D) not be heard at any distance at all from it

Explanation:

As there is no atmosphere surrounding the moon, the second from any band that is played there cannot travel outwards there is no material medium surrounding if for its propagation.

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4 3771
Q:

A boy is swinging a ball attached to a string in a horizontal circle.If the string snaps

A) the ball will travel towards the center of the circle and fall down B) it will continue to travel along a tangent to the circle at the point the ball was at the time of snapping and finally fall down
C) it will fall down at the same place where the string breaks D) none of these
 
Answer & Explanation Answer: B) it will continue to travel along a tangent to the circle at the point the ball was at the time of snapping and finally fall down

Explanation:

The centripetal force having  been removed the body cannot execute the curved path. (B) is Correct.

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4 3754
Q:

Which of the following is a Heterogeneous Mixture?

A) Air B) Table salt
C) Soda D) Brass
 
Answer & Explanation Answer: C) Soda

Explanation:

Here Soda is a Heterogenous Mixture.

 

A Heterogeneous Mixture is a mixture having a non-uniform composition i.e, the mixture contains components in different phases. Using various means, the parts in the mixture can be separated from one another.

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9 3741
Q:

A hunter on the ground wishes to shoot a  bird on a tree at a distance with his rifle. He has to point the rifle

A) at the lower alevation than the bird B) at a higher alevation than the bird
C) In the same direction as the bird D) vertically upwards
 
Answer & Explanation Answer: B) at a higher alevation than the bird

Explanation:

The trajectory of the bullet is a parabola

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