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 Physics Questions

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Q:

Speed in a given direction is called

A) Velocity B) Torque
C) Acceleration D) Displacement
 
Answer & Explanation Answer: A) Velocity

Explanation:

Speed in a given direction is called Velocity.

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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:

Fat can be seperated from milk in a cream seperator because of :

A) Cohesive Force B) Gravitational Force
C) Centripetal Force D) Centrifugal Force
 
Answer & Explanation Answer: D) Centrifugal Force

Explanation:
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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:

A series of fast moving still pictures can be made to appear as a moving picture because the eye 

A) can focus very rapidly as pictures change B) is quicker than the brain
C) can see 2 images separated only if the interval betwen seeing them is more than one-tenth of a second D) can shut out some of the light
 
Answer & Explanation Answer: C) can see 2 images separated only if the interval betwen seeing them is more than one-tenth of a second

Explanation:

The eye can see images separately only if they are exhibited at an interval of more than 1/10 of a second. In the case of a movie, the still pictures come one after the other at less than this minimum interval. So we do not see them separately but only as a continuous moving picture.

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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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Q:

Megahertz is a measurement of

A) Frequency B) Speed
C) Wavelength D) Capacity
 
Answer & Explanation Answer: A) Frequency

Explanation:

Megahertz is used to measure wave frequencies, as well as the speed of microprocessors. One MHz represents one million cycles per second. The speed of microprocessors, called the clock speed.

frequency_measurement1532346951.png image

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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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