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The following question based on light, heat, thermodynamics, wave motion, sound, optics & oscillations topic of general science mcq

Questions : Total internal reflection can take place only if

(a) the refractive indices of the two media are close to different

(b) light goes from optically rarer medium to optically denser medium

(c) light goes from optically denser medium to rarer medium

(d) the refractive indices of the two media are widely different

The correct answers to the above question in:

Answer: (c)

According to Snell’s Law,

${sin i}/{sin r} = µ_2/µ_1$

where r = 90° for a particular incidence angle called the critical angle. When the incidence angle is equal to or greater than ic, then total internal reflection occurs.

It takes place when a ray of light travels from an optically denser medium ($µ_1 > µ2$) to an optically rarer medium.

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Question : 1

Consider telecommunication through optical fibres. Which of the following statements is not true ?

a) Optical fibres may have homogeneous core with a suitable cladding

b) Optical fibres are subject to electromagnetic interference from outside

c) Optical fibres have extremely low transmission loss

d) Optical fibres can be of graded refractive index

Answer: (b)

Optical fibres are free from electromagnetic interference from outside.

Question : 2

Water has maximum density at

a) –4°C

b) 0°C

c) 32°F

d) 4°C

Answer: (d)

Water has maximum density at 4°C.

Question : 3

Consider the following phenomena.

  1. Size of the Sun at dusk
  2. Colour of the Sun at dawn
  3. Moon being visible at dawn
  4. Twinkle of stars in the sky
  5. Polestar being visible in the sky
Which of the above are optical illusions?

a) 1, 2 and 4

b) 3, 4 and 5

c) 1, 2 and 3

d) 2, 3 and 5

Answer: (a)

Question : 4

An air bubble inside water behaves as a

a) Divergent lens

b) Convergent lens

c) Bifocal lens

d) Cylindrical lens

Answer: (a)

Question : 5

Bats can ascertain distance, directions, nature and size of the obstacles at night. This is possible by reflection of the emitted

a) ultrasonic waves from the distant objects

b) ultrasonic waves from the bat

c) supersonic waves from the bat

d) supersonic waves from the distant objects

Answer: (b)

Question : 6

Which of the following radiations has the highest energy per quantum?

a) 280-320 nm

b) 200-280 nm

c) 320-400 nm

d) 400-600 nm

Answer: (b)

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