set 9 MCQ Questions & Answers Detailed Explanation

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

Questions : Two spheres of same size are made of the same metal but one is hollow and the other is solid. They are heated to same temperature, then

(a) solid sphere will expand more than the hollow one

(b) both spheres will expand equally

(c) hollow sphere will expand more than the solid one

(d) None of the above

The correct answers to the above question in:

Answer: (b)

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Read more light heat thermodynamics wave sound optics oscillation Based General Science Questions and Answers

Question : 1

The fine powder of a coloured glass is seen as

a) black

b) coloured

c) white

d) that of the glass colour

Answer: (c)

All colours are reflected.

Question : 2

Heat travels through vacuum by

a) Radiation

b) Conduction

c) Convection

d) Both (a) and (b)

Answer: (a)

Heat radiations are electromagnetic waves of high wavelength.

Question : 3

The velocity of sound in air is approximately

a) 10 mile/min

b) 330 m/s

c) 10 km/s

d) 3 × $10^10$ m/s

Answer: (b)

Question : 4

The Sun is visible to us a few minutes before the actual sunrise because of

a) Total internal reflection of light

b) Diffraction of light

c) Scattering of light

d) Refraction of light

Answer: (d)

Question : 5

What changes will the volume of water show if the temperature is lowered from 9ºC to 3ºC?

a) The volume will first increase and then decrease

b) The volume will first decrease and then increase

c) The volume will not change

d) Water will freeze

Answer: (b)

Question : 6

Material A has a critical angle $i_A$, and material B has a critical angle $i_B$ ($i_B > i_A$). Then which of the following is true?

  1. Light can be totally internally reflected when it passes from B to A
  2. Light can be totally internally reflected when it passes from A to B
  3. Critical angle for total internal reflection is $i_B – i_A$
  4. Critical angle between A and B is $sin^{-1}({sini_A}/{sini_B})$

a) 2 and 3

b) 1 and 3

c) 1 and 4

d) 2 and 4

Answer: (d)

iB > iA or  sin-1 $(1/{µ_B})$ > sin-1 $(1/{µ_A})$ or µA > µB

Hence medium A is denser and B is rarer.

Total internal Reflection: When the object is placed in an optically denser medium. and if the incident angle is greater than the critical angle then the ray of light gets reflected back to the originating medium.

For critical angle (α) from medium A to B, ${_Bµ_A}$

${_Bµ_A}$ = $1/{sin α}$ or sin α = $1/{_Bµ_A}$ = ${µ_B}/{µ_A}$

⇒ sin α = $1/{sin i_B}$ x ${sin i_A}/1$

⇒ α = sin-1 $[{sin i_A}/{sin i_B}]$

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