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 Physics Questions

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Q:

Which of the following cannot be used for making lenses?

A) Plastic B) Soil
C) Glass D) Water
 
Answer & Explanation Answer: B) Soil

Explanation:
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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:

When ice floats on water, its _____ part remains outside the water.

A) 0.5 B) 0.3
C) 0.1 D) 1
 
Answer & Explanation Answer: C) 0.1

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Q:

Intensity of any wave is proportional to which of the following?

A) amplitude B) Square of amplitude
C) Square root of amplitude D) Cube of amplitude
 
Answer & Explanation Answer: B) Square of amplitude

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Q:

Find the work done (in J) when a charge of 24 C moves across a potential difference of 6 V.

A) 4 B) 72
C) 8 D) 144
 
Answer & Explanation Answer: D) 144

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Q:

The antiparticle of an electron is

A) Positron B) Proton
C) Alpha particles D) Beta particles
 
Answer & Explanation Answer: A) Positron

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Q:

Find the power of a convex lens if the image formed is at a distance of 10 cm from the lens when the object is placed on the other side of the lens at 40 cm from the optical centre?

A) 12.5 diopters B) 7.5 diopters
C) -12.5 diopters D) -7.5 diopters
 
Answer & Explanation Answer: A) 12.5 diopters

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0 1386
Q:

The angle between the __________and the incident ray is called the angle of incidence.

A) surface B) normal
C) tangent D) reflected ray
 
Answer & Explanation Answer: B) normal

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