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 Physics Questions

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Q:

The force exerted on an object is 200 N and its mass is 100 kg. Find the acceleration of the object.

A) 2 m/s B) 2 m
C) 2 m/sq.s D) 2 s
 
Answer & Explanation Answer: C) 2 m/sq.s

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Q:

If the wavelengths corresponding to ultraviolet, visible and infrared radiations are given as lUV, lVIS and lIR respectively, then which of the following gives the correct relationship among these wavelengths?

A) lUV < lIR < lVIS B) lUV > lVIS > lIR
C) lUV > lIR > lVIS D) lUV < lVIS < lIR
 
Answer & Explanation Answer: D) lUV < lVIS < lIR

Explanation:

Infrared radiation, what we experience as heat when we hold our hand near a warm object, is somewhat longer wavelengths than visible light. Visible light is simply electromagnetic radiation in a range of wavelengths that our eyes are sensitive to. Visible wavelengths range from 0.0007 milimeters for red light, through orange, yellow, green, and blue, to 0.0004 milimeters for violet light. Ultraviolet is shorter wavelengths than violet.

Longer the wavelength,lower the energy

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Q:

The  optical  phenomenon  that  is  primarily responsible  for  the  observation  of  rainbow on a rainy day is 

A) diffraction B) interference
C) dispersion D) reflection
 
Answer & Explanation Answer: C) dispersion

Explanation:

A rainbow is a natural spectrum appearing in the sky after a rain shower. It is caused by dispersion of sunlight by tiny water droplets, present in the atmosphere. A rainbow is always formed in a direction opposite to that of the Sun. The water droplets act like small prisms. They refract and disperse the incident sunlight, then reflect it internally, and finally refract it again when it comes out of the raindrops.

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Q:

After removing two electrons from helium atom it become?

A) UV rays B) Alpha particle
C) Gama particle D) X rays
 
Answer & Explanation Answer: B) Alpha particle

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Q:

During the motion of a projectile fired from the earth surface, _______

A) its kinetic energy remains constant B) its momentum remains constant
C) vertical component of its velocity remains constant D) horizontal component of its velocity remains constant
 
Answer & Explanation Answer: D) horizontal component of its velocity remains constant

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Q:

Which of the following pair is INCORRECT?
I. Parsec - Distance
II. Barrel - Liquid
III. Light year - Time

A) Only III B) Only I and III
C) Only II D) All are correct
 
Answer & Explanation Answer: A) Only III

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Q:

The group of solar cells joined together in a definite pattern is called a

A) Battery B) Solar Heater
C) Solar cooker D) Solar cell panel
 
Answer & Explanation Answer: D) Solar cell panel

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Q:

If an object moves with constant velocity,

A) it must have constant speed B) it must have constant direction
C) it must have constant speed in constant direction D) None of the above
 
Answer & Explanation Answer: C) it must have constant speed in constant direction

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