Physics [Light] Questions for Railway ALP Stage-II Exam : 7th December 2018

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Q1. What is the wavelength of visible spectrum?
рджреГрд╢реНрдп рд╕реНрдкреЗрдХреНрдЯреНрд░рдо рдХреА рддрд░рдВрдЧрджреИрд░реНрдзреНрдп рдХреНрдпрд╛ рд╣реИ
(a) 1300 ├Е to 3000 ├Е
(b) 3900 ├Е to 7600 ├Е
(c) 7800 ├Е to 8000 ├Е
(d) 8500 ├Е to 9800 ├Е
Ans.(b)
Sol. The visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye. Electromagnetic radiation in this range of wavelengths is called visible light or simply light. A typical human eye will respond to wavelengths from about 3900 ├Е to7600 ├Е .

Q2. An electron microscope gives higher magnification than an optical microscope, because
рдПрдХ рдЗрд▓реЗрдХреНрдЯреНрд░реЙрди рдорд╛рдЗрдХреНрд░реЛрд╕реНрдХреЛрдк рдПрдХ рдСрдкреНрдЯрд┐рдХрд▓ рдорд╛рдЗрдХреНрд░реЛрд╕реНрдХреЛрдк рдХреА рддреБрд▓рдирд╛ рдореЗрдВ рдЙрдЪреНрдЪ рдЖрд╡рд░реНрдзрди рджреЗрддрд╛ рд╣реИ, рдХреНрдпреЛрдВрдХрд┐
(a) it uses more powerful lenses/ рдпрд╣ рдЕрдзрд┐рдХ рд╢рдХреНрддрд┐рд╢рд╛рд▓реА рд▓реЗрдВрд╕ рдХрд╛ рдЙрдкрдпреЛрдЧ рдХрд░рддрд╛ рд╣реИ
(b) the velocity of electron is smaller than that of visible light/ рдЗрд▓реЗрдХреНрдЯреНрд░реЙрди рдХреА рд╡реЗрдЧ рджреГрд╢реНрдп рдкреНрд░рдХрд╛рд╢ рдХреА рддреБрд▓рдирд╛ рдореЗрдВ рдЫреЛрдЯреА рд╣реИ
(c) the electrons have more energy / рдЗрд▓реЗрдХреНрдЯреНрд░реЙрдиреЛрдВ рдореЗрдВ рдЕрдзрд┐рдХ рдКрд░реНрдЬрд╛ рд╣реЛрддреА рд╣реИ
(d) the wavelength of electrons is smaller as compared to the wavelength of visible light / рджреГрд╢реНрдп рдкреНрд░рдХрд╛рд╢ рдХреА рддрд░рдВрдЧрджреИрд░реНрдзреНрдп рдХреА рддреБрд▓рдирд╛ рдореЗрдВ рдЗрд▓реЗрдХреНрдЯреНрд░реЙрдиреЛрдВ рдХреА рддрд░рдВрдЧ рджреИрд░реНрдзреНрдп рдЫреЛрдЯреА рд╣реИ

Ans.(d)
Sol. An electron microscope gives higher magnification than an optical microscope, because the wavelength of electrons is smaller as compared to the wavelength of visible light .

Q3. The mass-energy relation is the outcome of
рдорд╛рд╕-рдКрд░реНрдЬрд╛ рд╕рдВрдмрдВрдз рдХрд┐рд╕ рдХрд╛ рдирддреАрдЬрд╛ рд╣реИ
(a) quantum theory / рдХреНрд╡рд╛рдВрдЯрдо рд╕рд┐рджреНрдзрд╛рдВрдд
(b) general theory of relativity/ рд╕рд╛рдкреЗрдХреНрд╖рддрд╛ рдХрд╛ рд╕рд╛рдорд╛рдиреНрдп рд╕рд┐рджреНрдзрд╛рдВрдд
(c) field theory of energy / рдКрд░реНрдЬрд╛ рдХреЗ рдХреНрд╖реЗрддреНрд░ рд╕рд┐рджреНрдзрд╛рдВрдд
(d) special theory of relativity / рд╕рд╛рдкреЗрдХреНрд╖рддрд╛ рдХрд╛ рд╡рд┐рд╢реЗрд╖ рд╕рд┐рджреНрдзрд╛рдВрдд

Ans.(d)
Sol. Energy and Mass Are Relative. The equation E = mc2 (special theory of relativity )states that the amount of energy possessed by an object is equal to its mass multiplied by the square of the speed of light.

Q4. A simple microscope consists of
рдПрдХ рд╕рд╛рдзрд╛рд░рдг рдорд╛рдЗрдХреНрд░реЛрд╕реНрдХреЛрдк рдХрд┐рд╕ рд╕реЗ рдмрдирд╛ рд╣реЛрддрд╛ рд╣реИрдВ?
(a) a short focus convex lens / рдПрдХ рд▓рдШреБ рдлреЛрдХрд╕ рд╡рд╛рд▓рд╛ рдЙрддреНрддрд▓ рд▓реЗрдВрд╕
(b) a long focus convex lens/ рдПрдХ рд▓рдВрдмреЗ рдлреЛрдХрд╕ рд╡рд╛рд▓рд╛ рдЙрддреНрддрд▓ рд▓реЗрдВрд╕
(c) a short focus concave lens / рдПрдХ рд▓рдШреБ рдлреЛрдХрд╕ рд╡рд╛рд▓рд╛ рдЕрд╡рддрд▓ рд▓реЗрдВрд╕
(d) a long focus concave lens/ рдПрдХ рд▓рдВрдмреЗ рдлреЛрдХрд╕ рд╡рд╛рд▓рд╛ рдЕрд╡рддрд▓ рд▓реЗрдВрд╕

Ans.(a)
Sol. Simple microscope is used for observing magnified images of the objects. It consists of a short focus convex lens.
The magnifying power of simple microscope can be determined in two cases. When the final image is formed at least distance of district vision (D),
Then M=1+D/f
When the final image is formed at infinity, the M=D/f
Where M = magnifying power
D = distance of distinct vision
f = focal length of the lens

Q5. The speed of light with the rise in the temperature of the medium
рдХрд┐рд╕реА рдорд╛рдзреНрдпрдо рдХреЗ рддрд╛рдкрдорд╛рди рдореЗрдВ рд╡реГрджреНрдзрд┐ рдХреЗ рд╕рд╛рде рдкреНрд░рдХрд╛рд╢ рдХреА рдЧрддрд┐
(a) increases/рдмрдврддреА рд╣реИ
(b) decreases /рдШрдЯрддреА рд╣реИ
(c) remains constant/рд╕рд╛рдорд╛рди рд░рд╣рддреА рд╣реИ
(d) drops suddenly / рдЕрдЪрд╛рдирдХ рдЧрд┐рд░рддрд╛ рд╣реИ

Ans.(c)
Sol. Speed of light does not depends on the temperature. It is a constant which is denoted by ‘c’.

Q6. Which one of the following is used for sun glasses?
рдзреВрдк рдХреЗ рдЪрд╢реНрдореЗ рдХреЗ рд▓рд┐рдП рдЗрдирдореЗрдВ рд╕реЗ рдХреМрди рд╕рд╛ рдЙрдкрдпреЛрдЧ рдХрд┐рдпрд╛ рдЬрд╛рддрд╛ рд╣реИ?
(a) pyrex glass/ рдкрд╛рдЗрд░реЗрдХреНрд╕ рдЧреНрд▓рд╛рд╕
(b) flint glass/ рдлреНрд▓рд┐рдВрдЯ рдЧреНрд▓рд╛рд╕
(c) Crooks glass / рдХреНрд░реВрдХ рдЧреНрд▓рд╛рд╕
(d) Crystal glass/ рдХреНрд░рд┐рд╕реНрдЯрд▓ рдЧреНрд▓рд╛рд╕

Ans.(c)
Sol. Crookes glass mainly cerium oxide (CiO2) is present which sharply absorbs the ultraviolet rays from the sunlight so utilised in making lenses of eye glasses.

Q7. What is viewed through an electron microscope?
рдПрдХ рдЗрд▓реЗрдХреНрдЯреНрд░реЙрди рдорд╛рдЗрдХреНрд░реЛрд╕реНрдХреЛрдк рдХреЗ рдорд╛рдзреНрдпрдо рд╕реЗ рдХреНрдпрд╛ рджреЗрдЦрд╛ рдЬрд╛ рд╕рдХрддрд╛ рд╣реИ?
(a) Inside of the human eye/ рдорд╛рдирд╡ рдЖрдВрдЦ рдХреЗ рдЕрдВрджрд░
(b) Structure of bacteria and viruses / рдмреИрдХреНрдЯреАрд░рд┐рдпрд╛ рдФрд░ рд╡рд╛рдпрд░рд╕ рдХрд╛ рдврд╛рдВрдЪрд╛
(c) Inside of human stomach / рдорд╛рдирд╡ рдкреЗрдЯ рдХреЗ рдЕрдВрджрд░
(d) None of these/рдЗрдирдореЗрдВ рд╕реЗ рдХреЛрдИ рдирд╣реАрдВ
Ans.(b)
Sol. The electron microscope is a type of microscope that uses a beam of electrons to create an image of the specimen. It is capable of much higher magnifications and has a greater resolving power than a light microscope, allowing it to see much smaller objects in finer detail.

Q8. Which combination of colour is the most convenient during day and night time?
рд░рдВрдЧ рдХрд╛ рдХреМрди рд╕рд╛ рд╕рдВрдпреЛрдЬрди рджрд┐рди рдФрд░ рд░рд╛рдд рдХреЗ рд╕рдордп рдХреЗ рджреМрд░рд╛рди рд╕рдмрд╕реЗ рд╕реБрд╡рд┐рдзрд╛рдЬрдирдХ рд╣реИ?
(a) Organe and blue/ рдирд╛рд░рдВрдЧреА рдФрд░ рдиреАрд▓рд╛
(b) White and black/рд╕реЮреЗрдж рдФрд░ рдХрд╛рд▓рд╛
(c) Yellow and blue/рдкреАрд▓рд╛ рдФрд░ рдиреАрд▓рд╛
(d) Red and green/рд▓рд╛рд▓ рдФрд░ рд╣рд░рд╛
Ans.(d)
Sol. Red and green colour is the most convenient during day and night time .

Q9. The blue colour of water in the sea is due to
рд╕рдореБрджреНрд░ рдореЗрдВ рдкрд╛рдиреА рдХрд╛ рдиреАрд▓рд╛ рд░рдВрдЧ рдХрд┐рд╕ рдХреЗ рдХрд╛рд░рдг рд╣реЛрддрд╛ рд╣реИ
(a) absorption of other colours except blue by water molecules/ рдкрд╛рдиреА рдХреЗ рдЕрдгреБрдУрдВ рджреНрд╡рд╛рд░рд╛ рдиреАрд▓реЗ рд░рдВрдЧ рдХреЛ рдЫреЛрдбрд╝рдХрд░ рдЕрдиреНрдп рд░рдВрдЧреЛрдВ рдХрд╛ рдЕрд╡рд╢реЛрд╖рдг
(b) scattering of blue light by water molecules / рдкрд╛рдиреА рдХреЗ рдЕрдгреБрдУрдВ рджреНрд╡рд╛рд░рд╛ рдиреАрд▓реА рд░реЛрд╢рдиреА рдХреА рдмрд┐рдЦрд░рдиреЗ
(c) reflection of blue light by impurities in sea water/ рд╕рдореБрджреНрд░ рдХреЗ рдкрд╛рдиреА рдореЗрдВ рдЕрд╢реБрджреНрдзрд┐рдпреЛрдВ рджреНрд╡рд╛рд░рд╛ рдиреАрд▓реА рд░реЛрд╢рдиреА рдХрд╛ рдкреНрд░рддрд┐рдмрд┐рдВрдм
(d) reflection of blue sky by sea water/ рд╕рдореБрджреНрд░ рдХреЗ рдкрд╛рдиреА рд╕реЗ рдиреАрд▓реЗ рдЖрд╕рдорд╛рди рдХрд╛ рдкреНрд░рддрд┐рдмрд┐рдВрдм
Ans.(a)
Sol. The ocean looks blue because red, orange and yellow (long wavelength light) are absorbed more strongly by water than is blue (short wavelength light). So when white light from the sun enters the ocean, it is mostly the blue that gets returned.

Q10. Rainbow is seen after rain because of hanging molecules of water which act as
рдЗрдВрджреНрд░рдзрдиреБрд╖ рдмрд╛рд░рд┐рд╢ рдХреЗ рдмрд╛рдж рджреЗрдЦрд╛ рдЬрд╛рддрд╛ рд╣реИ, рдпрд╣ рдкрд╛рдиреА рдХреЗ рдЧрд┐рд░рддреЗ рдЕрдгреБрдУрдВ рдХреЗ рдХрд╛рд░рдг рд╣реЛрддрд╛ рд╣реИ рдЬреЛ _____ рдХреЗ рд░реВрдк рдореЗрдВ рдХрд╛рд░реНрдп рдХрд░рддреЗ рд╣реИрдВ
(a) lenses/рд▓реЗрдВрд╕
(b) prism/ рдкреНрд░рд┐рдЬреНрдо
(c) mirrors/ рджрд░реНрдкрдг
(d) slabs / рд╕реНрд▓реИрдм
Ans.(b)
Sol. Rainbow is seen after rain because of hanging molecules of water which act as prism.

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