Light MCQ question and answer with solution

1

Which combination of colour is the most convenient during day and night time?

A) Orange and blue B) White and black C) Yellow and blue D) Red and green

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Answer & Solution

Answer: Option D

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2

Lenses with two focal lengths are used by persons suffering from . . . . . . . .

A) Myopia and hypermetropia B) Myopia or hypermetropia C) Myopia but not hypermetropia D) Hypermetropia but not myopia

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Answer & Solution

Answer: Option A

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3

Which one of the following statements regarding lenses is not correct?

A) A convex lens produces both real and virtual images B) A concave lens produces both real and virtual images C) A convex lens can produce images equal, greater and smaller than the size of the object D) A concave lens always produces images smaller than the size of the object

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Answer & Solution

Answer: Option B

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4

Consider the following statements.
1. If a person looks at a coin which is in a bucket of water, the coin will appear to be closer than it really is.
2. If a person under water looks at a coin above the water surface, the coin will appear to be at a higher level than it really is.
Which of the above statements is/are correct?

A) Both 1 and 2 B) Only 1 C) Only 2 D) Neither 1 nor 2

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Answer & Solution

Answer: Option A

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5

Due to atmospheric refraction, sunrise and sunset can be delayed by about . . . . . . . .

A) 3 minutes B) 2 minutes C) 4 minutes D) 1 minute

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Answer & Solution

Answer: Option B

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6

A water tank appears shallower when it is viewed from top due to

A) rectilinear propagation of light B) reflection C) total internal reflection D) refraction

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Answer & Solution

Answer: Option D

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7

Light enters the eye from . . . . . . . .

A) Ciliary Muscle B) Cornea C) Iris D) Lens

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Answer & Solution

Answer: Option B

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8

The process of glare resulting from a collision caused by a collision with particles floating in a fluid of light is called:

A) Raman effect B) Tyndall effect C) Snail effect D) Huygen's effect

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Answer & Solution

Answer: Option B

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9

The energies E₁ and E₂ of the two radiations are 25eV and 50eV respectively. The relation between their wavelengths i.e. λ₁ and λ₂ will be . . . . . . . .

A) $${\lambda _1} = \left( {\frac{1}{2}} \right){\lambda _2}$$ B) λ₁ = λ₂ C) λ₁ = 2λ₂ D) λ₁ = 4λ₂

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Answer & Solution

Answer: Option C

Solution:

We are given two radiations with energies E₁ = 25 eV and E₂ = 50 eV, and we need to determine how their wavelengths λ₁ and λ₂ are related.
The energy of radiation is inversely proportional to its wavelength, as described by the equation:
E = h * c / λ
Where:
E is the energy of the radiation,
h is Planck's constant,
c is the speed of light, and
λ is the wavelength.
Since energy and wavelength are inversely proportional, we can express the ratio of the wavelengths in terms of the energies:
λ₁ / λ₂ = E₂ / E₁
Substituting the values for the energies:
λ₁ / λ₂ = 50 / 25 = 2
This means that the wavelength λ₁ is twice the wavelength λ₂. Hence, λ₁ = 2λ₂.
Thus, the correct answer is Option C.

10

Who can be held responsible for the fact that the sun is visible 2 minutes before the actual sunrise and about 2 minutes after the actual sunset?

A) Atmospheric reflection B) Internal reflection produced in atmospheric water droplets C) Sunlight spreads by small drops of water present in the atmosphere D) Atmospheric refraction

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Answer & Solution

Answer: Option D

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Light MCQ question and answer with solution | Physics Gk MCQs