# Physics Quiz (Light & Eye) For ALP Stage-II Quiz Exam : 7th January

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Q1. The position, relative size and nature of the image formed by a concave lens for an object placed at infinity are respectively рдЕрдирдиреНрдд рдкрд░ рд░рдЦреА рдЧрдИ рд╡рд╕реНрддреБ рдХреЗ рд▓рд┐рдП рдЕрд╡рддрд▓ рд▓реЗрдВрд╕ рджреНрд╡рд╛рд░рд╛ рдмрдиреЗ рдкреНрд░рддрд┐рдмрд┐рдореНрдм рдХреА рд╕реНрдерд┐рддрд┐, рд╕рд╛рдкреЗрдХреНрд╖ рдЖрдХрд╛рд░ рдФрд░ рдкреНрд░рдХреГрддрд┐ рдХреНрд░рдорд╢рдГ рд╣реИрдВ
(a) at focus, diminished and virtual рдХреЗрдВрджреНрд░ рдкрд░, рдЫреЛрдЯрд╛ рдФрд░ рдЖрднрд╛рд╕реА
(b) at focus, diminished and real рдХреЗрдВрджреНрд░ рдкрд░, рдЫреЛрдЯрд╛ рдФрд░ рд╡рд╛рд╕реНрддрд╡рд┐рдХ
(c) between focus and optical centre, diminished and virtual  рдХреЗрдВрджреНрд░ рдФрд░ рдСрдкреНрдЯрд┐рдХрд▓ рдХреЗрдВрджреНрд░ рдХреЗ рдмреАрдЪ,рдЫреЛрдЯрд╛ рдФрд░ рдЖрднрд╛рд╕реА
(d) between focus and optical centre, magnified and real рдХреЗрдВрджреНрд░ рдФрд░ рдСрдкреНрдЯрд┐рдХрд▓ рдХреЗрдВрджреНрд░ рдХреЗ рдмреАрдЪ, рдЖрд╡рд░реНрдзрд┐рдд рдФрд░ рд╡рд╛рд╕реНрддрд╡рд┐рдХ

Ans.(a)
Sol. From the ray diagram, it is very clear that the image of the object placed at infinity from a concave lens is virtual diminished and at the focus of the lens.

Q2. The upper and lower portions in common type of bi-focal lenses are respectively
рд╕рд╛рдорд╛рдиреНрдп рдкреНрд░рдХрд╛рд░ рдХреЗ рджреНрд╡рд┐-рдлреЛрдХрд╕реА рд▓реЗрдВрд╕ рдореЗрдВ рдКрдкрд░реА рдФрд░ рдирд┐рдЪрд▓реЗ рднрд╛рдЧ рдХреНрд░рдорд╢рдГ рд╣реЛрддреЗ рд╣реИрдВ
(a) concave and convex  рдЕрд╡рддрд▓ рдФрд░ рдЙрддрд▓
(b) convex and concave рдЙрддрд▓ рдФрд░ рдЕрд╡рддрд▓
(c) both concave of different focal lengths рд╡рд┐рднрд┐рдиреНрди рдлреЛрдХрд╕ рд▓рдореНрдмрд╛рдИ рдХреЗ рджреЛрдиреЛрдВ рдЕрд╡рддрд▓
(d) both convex of different focal lengths рд╡рд┐рднрд┐рдиреНрди рдлреЛрдХрд╕ рд▓рдореНрдмрд╛рдИ рдХреЗ рджреЛрдиреЛрдВ рдЙрддрд▓

Ans.(a)
Sol. The upper and lower portions in common type of bifocal lenses are concave and convex respectively.

Q3. In the phenomenon of dispersion of light, the light wave of shortest wavelength is
рдкреНрд░рдХрд╛рд╢ рдХреЗ рдлреИрд▓рд╛рд╡ рдХреА рд╕реНрдерд┐рддрд┐ рдореЗрдВ, рд╕рдмрд╕реЗ рдЫреЛрдЯреА рддрд░рдВрдЧ рджреИрд░реНрдзреНрдп рдХреА рдкреНрд░рдХрд╛рд╢ рддрд░рдВрдЧ рд╣реЛрддреА рд╣реИ
(a) accelerated and refracted the most рддреНрд╡рд░рд┐рдд рдФрд░ рд╕рдмрд╕реЗ рдЕрдзрд┐рдХ рдЕрдкрд╡рд░реНрддрд┐рдд
(b) slowed down and refracted the most  рдзреАрдореА рдФрд░ рд╕рдмрд╕реЗ рдЕрдзрд┐рдХ рдЕрдкрд╡рд░реНрддрд┐рдд
(c) accelerated and refracted the least рддреНрд╡рд░рд┐рдд рдФрд░ рд╕рдмрд╕реЗ рдХрдо рдЕрдкрд╡рд░реНрддрд┐рдд
(d) slowed down and refracted the least рдзреАрдореА рдФрд░ рд╕рдмрд╕реЗ рдХрдо рдЕрдкрд╡рд░реНрддрд┐рдд

Ans.(b)
Sol. In the phenomenon of dispersion of light, the light wave of shortest wavelength is  slowed down and refracted the most.

Q4. In an observation, ╬▒-particles, ╬▓-particles and ╬│-rays have same energies. Their penetrating power in a given medium in increasing order will be
рдХрд┐рд╕реА рдирд┐рд░реАрдХреНрд╖рдг рдореЗрдВ, ╬▒-рдХрдг, ╬▓-рдХрдг  рдФрд░ ╬│-рдХрд┐рд░рдгреЛрдВ рдХреА рд╕рдорд╛рди рдКрд░реНрдЬрд╛ рд╣реИредрджрд┐рдП рдЧрдпреЗ рдорд╛рдзреНрдпрдо рдореЗрдВ рдмреЭрддреЗ рд╣реБрдП рдХреНрд░рдо рдореЗрдВ рдЙрдирдХреА рднреЗрджрди рдХреНрд╖рдорддрд╛ рд╣реЛрдЧреА
(a) ╬▒, ╬▓, ╬│
(b) ╬▓, ╬╗, ╬▒
(c) ╬▒, ╬╗, ╬▓
(d) ╬▓, ╬▒, ╬╗

Ans.(a)
Sol. ╬│ тАУ rays are the most penetrating rays
╬▓ тАУ particles are moderately penetrating and
╬▒ тАУ particles are least penetrating.

Q5. Contact lenses are made from  рд╕рдореНрдкрд░реНрдХ рд▓реЗрдВрд╕ рдмрдиреЗ рд╣реЛрддреЗ рд╣реИрдВ
(a) polyvinyl chloride рдкреЛрд▓реАрд╡рд┐рдирд╛рдЗ рдХреНрд▓реЛрд░рд╛рдб
(b) polystyrene рдкрд╛рд▓реАрд╕реНрдЯрд╛рдЗрд░реАрди
(c) lucite рд▓реНрдпреВрд╕рд╛рдЗрдЯ
(d) Teflon рдЯреЗреЮрд▓реЛрди

Ans.(c)
Sol. Contact lenses are made from lucite. It is a polymer of methyl methacrylate. The other names of lucite are plexiglass, acrylate and Perspex.

Q6. Wavelength of which of the following colour of the visible spectrum of light are maximally absorbed by green plants?  рд╣рд░реЗ рд░рдВрдЧ рдХреЗ рдкреМрдзреЛрдВ рджреНрд╡рд╛рд░рд╛ рдкреНрд░рдХрд╛рд╢ рдХреЗ рджреГрд╢реНрдп рд╕реНрдкреЗрдХреНрдЯреНрд░рдо рдХреЛ рдирд┐рдореНрдирд▓рд┐рдЦрд┐рдд рдореЗрдВ рд╕реЗ рдХрд┐рд╕ рд░рдВрдЧ рдХреА рддрд░рдВрдЧ рджреИрд░реНрдзреНрдп рдХреЛ рдЕрдзрд┐рдХрддрдо рдЕрд╡рд╢реЛрд╖рд┐рдд рдХрд┐рдпрд╛ рдЬрд╛рддрд╛ рд╣реИ?
(a) Green and Yellow рд╣рд░реЗ рдФрд░ рдкреАрд▓реЗ
(b) Red and Blue  рд▓рд╛рд▓ рдФрд░ рдиреАрд▓
(c) Green and Red  рд╣рд░реЗ рдФрд░ рд▓рд╛рд▓
(d) Blue and Yellow  рдиреАрд▓ рдФрд░ рдкреАрд▓реЗ

Ans.(b)
Sol. Green plants absorb red and blue colour maximally.

Q7. Consider the following statements  рдирд┐рдореНрдирд▓рд┐рдЦрд┐рдд рдХрдердиреЛрдВ рдкрд░ рд╡рд┐рдЪрд╛рд░ рдХрд░реЗрдВ
1. A person with myopia can see distant objects distinctly but cannot see nearby objects clearly. рдирд┐рдХрдЯ рджреГрд╖реНрдЯрд┐ рджреЛрд╖ рд╡рд╛рд▓реЗ рд╡реНрдпрдХреНрддрд┐ рджреВрд░ рдХреА рд╡рд╕реНрддреБрдУрдВ рдХреЛ рдЕрд▓рдЧ-рдЕрд▓рдЧ рджреЗрдЦ рд╕рдХрддреЗ рд╣реИрдВ, рд▓реЗрдХрд┐рди рдкрд╛рд╕ рдХреА рд╡рд╕реНрддреБрдУрдВ рдХреЛ рд╕реНрдкрд╖реНрдЯ рд░реВрдк рд╕реЗ рдирд╣реАрдВ рджреЗрдЦ рд╕рдХрддреЗ рд╣реИрдВред
2. A person with hypermetropia cannot see distant objects clearly. рд╣рд╛рдЗрдкрд░рдореЗрдЯреНрд░реЛрдкрд┐рдпрд╛ рд╡рд╛рд▓реЗ рд╡реНрдпрдХреНрддрд┐ рджреВрд░ рдХреА рд╡рд╕реНрддреБрдУрдВ рдХреЛ рд╕реНрдкрд╖реНрдЯ рд░реВрдк рд╕реЗ рдирд╣реАрдВ рджреЗрдЦ рд╕рдХрддреЗ рд╣реИрдВред
3. A person with presbyopia can see nearby objects without corrective glasses. реЫрд░рд╛рджреВрд░рджрд░реНрд╢рд┐рддрд╛ рд╡рд╛рд▓реЗ рд╡реНрдпрдХреНрддрд┐ рд╕реБрдзрд╛рд░рд╛рддреНрдордХ рдЪрд╢реНрдореЗ рдХреЗ рдмрд┐рдирд╛ рдкрд╛рд╕ рдХреА рд╡рд╕реНрддреБрдУрдВ рдХреЛ рджреЗрдЦ рд╕рдХрддреЗ рд╣реИрдВред
Which of the statements given above is/are not correct? рдКрдкрд░ рджрд┐рдП рдЧрдП рдХрдердиреЛрдВ рдореЗрдВ рд╕реЗ рдХреМрди рд╕рд╛/рд╕реЗ рд╕рд╣реА рдирд╣реАрдВ рд╣реИ / рд╣реИрдВ?
(a) 1, 2 and 3    1, 2 рдФрд░ 3
(b) 1 and 3      1 рдФрд░ 3
(c) 1 and 2     1 рдФрд░ 2
(d) Only 3      рдХреЗрд╡рд▓ 3
Ans.(a)
Sol. All the three statements are not correct. Myopia refers long-sightedness, hypermetropia to short-sightedness and progressively diminished ability to focus on near object with the passage of age.

Q8. A person is unable to read a newspaper without his glasses. He is most probably suffering from  рдПрдХ рд╡реНрдпрдХреНрддрд┐ рдЕрдкрдиреЗ рдЪрд╢реНрдореЗ рдХреЗ рдмрд┐рдирд╛ рдЕрдЦрдмрд╛рд░ рдкрдврд╝рдиреЗ рдореЗрдВ рдЕрд╕рдорд░реНрде рд╣реИред рд╢рд╛рдпрдж рд╡рд╣ рд╕рдмрд╕реЗ рдЬреНрдпрд╛рджрд╛ рдкреАрдбрд╝рд┐рдд рд╣реИ
(a) myopia  рдирд┐рдХрдЯ рджреГрд╖реНрдЯрд┐ рджреЛрд╖
(b) presbyopia реЫрд░рд╛рджреВрд░рджрд░реНрд╢рд┐рддрд╛
(c) astigmatism рдЕрдмрд┐рдиреНрджреБрдХрддрд╛
(d) hypermetropia рд╣рд╛рдЗрдкрд░рдореЗрдЯреНрд░реЛрдкрд┐рдпрд╛
Ans.(d)
Sol. Long sightedness or hypermetropia is eye related problem in which image is formed behind the retina. This may be due to short eye or cornea or crystalline lens does not refract the light enough.

Q9. Which one of the following statements is not correct?   рдирд┐рдореНрдирд▓рд┐рдЦрд┐рдд рдореЗрдВ рд╕реЗ рдХреМрди рд╕рд╛ рдХрдерди рд╕рд╣реА рдирд╣реАрдВ рд╣реИ?
(a) The longest wavelength of light visible human eye is about 700 mm рдкреНрд░рдХрд╛рд╢ рдХреА рд╕рдмрд╕реЗ рд▓рдВрдмреА рдорд╛рдирд╡ рдиреЗрддреНрд░ рдХреЛ рджрд┐рдЦрд╛рдпреА рджреЗрдиреЗ рд╡рд╛рд▓реА рддрд░рдВрдЧ рджреИрд░реНрдзреНрдп рд▓рдЧрднрдЧ 700 рдорд┐рдореА рд╣реИ
(b) The shortest wavelength of light visible to human eye is about 400 mm рдкреНрд░рдХрд╛рд╢ рдХреА рд╕рдмрд╕реЗ рдЫреЛрдЯреА рдорд╛рдирд╡ рдиреЗрддреНрд░ рдХреЛ рджрд┐рдЦрд╛рдпреА рджреЗрдиреЗ рд╡рд╛рд▓реА рддрд░рдВрдЧ рджреИрд░реНрдзреНрдп рд▓рдЧрднрдЧ 400 рдорд┐рдореА рд╣реИ
(c) The wavelength of gamma rays is longer than that of X-rays рдЧрд╛рдорд╛ рдХрд┐рд░рдгреЛрдВ рдХреА рддрд░рдВрдЧрджреИрд░реНрдШреНрдп рдПрдХреНрд╕-рдХрд┐рд░рдгреЛрдВ рдХреА рддреБрд▓рдирд╛ рдореЗрдВ рд▓рдВрдмреА рд╣реЛрддреА рд╣реИ
(d) The ability of a telescope to form separable image of close objects is called its resolving power рдЯреЗрд▓реАрд╕реНрдХреЛрдк рдХрд╛ рдирд┐рдХрдЯ рд╡рд╕реНрддреБрдУрдВ рдХрд╛ рдЕрд▓рдЧ рдкреНрд░рддрд┐рдмрд┐рдореНрдм рдмрдирд╛рдиреЗ рдХреА рдХреНрд╖рдорддрд╛ рдХреЛ рдЗрд╕рдХреА рд╡рд┐рднреЗрджрди рдХреНрд╖рдорддрд╛ рдХрд╣рд╛ рдЬрд╛рддрд╛ рд╣реИ

Ans.(c)
Sol. The wavelength of gamma rays is lesser  than that of X-rays

Q10. If the image of an object, formed by a concave mirror is virtual, erect and magnified, then the object is placed  рдпрджрд┐ рдЕрд╡рддрд▓ рджрд░реНрдкрдг рджреНрд╡рд╛рд░рд╛ рдирд┐рд░реНрдорд┐рдд рд╡рд╕реНрддреБ рдХрд╛ рдкреНрд░рддрд┐рдмрд┐рдореНрдм рдЖрднрд╛рд╕реА, рд╕реАрдзрд╛ рдФрд░ рдЖрд╡рд░реНрдзрд┐рдд рд╣реЛрддрд╛ рд╣реИ, рддреЛ рд╡рд╕реНрддреБ рд░рдЦреА рдЬрд╛рддреА рд╣реИ
(a) at the principal focus рдореБрдЦреНрдп рдХреЗрдВрджреНрд░ рдкрд░
(b) at the centre of curvature рд╡рдХреНрд░рддрд╛ рдХреЗ рдХреЗрдВрджреНрд░ рдкрд░
(c) beyond the centre of curvature рд╡рдХреНрд░рддрд╛ рдХреЗ рдХреЗрдВрджреНрд░ рдХреЗ рдЖрдЧреЗ
(d) between the pole of the mirror and the principal focus  рджрд░реНрдкрдг рдХреЗ рдзреНрд░реБрд╡ рдФрд░ рдореБрдЦреНрдп рдХреЗрдВрджреНрд░ рдХреЗ рдордзреНрдп

Ans.(d)
Sol. If the image of an object, formed by a concave mirror is virtual, erect and magnified, then the object is placed between the pole of the mirror and the principal focus .

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