light, heat, thermodynamics, wave motion, sound, optics & oscillations - Category wise Question and Answer Practice Test with Solutions

light, heat, thermodynamics, wave motion, sound, optics & oscillations PRACTICE TEST [16 - EXERCISES]

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set 2

set 3

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set 5

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set 9

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set 11

set 12

set 13

set 14

set 15

set 16

Question : 11

If a liquid is heated in condition of weightlessness, the heat is transmitted through

a) radiation

b) conduction

c) convection

d) None, because the liquid cannot be heated in weightlessness

Discuss »

Answer: (b)

Convection is not possible in weightlessness. So the liquid will be heated through conduction.

Question : 12 [PSC (Pre) 2018]

A cut diamond shines brilliantly due to

a) Its molecular structure

b) Total internal reflection

c) Some inherent property

d) Absorption of light

Discuss »

Answer: (b)

Question : 13

Consider the following statements :

  1. Bells are made of metal and not of wood because the sound is not conducted by metals but is radiated.
  2. The rate of transfer of energy in a wave depends directly on the square of the wave amplitude and square of the wave frequency.
Which of these statements is/are correct ?

a) 1 and 2 both

b) 1 only

c) 2 only

d) None

Discuss »

Answer: (c)

Metal is a good conductor of sound because it is solid and hence it has atoms are very near, this causes more vibration required for conducting sound.

Question : 14 [NDA]

The simple harmonic motion of a particle is given by y = 3 sinω + 4 cosω. Which one of the following is the amplitude of this motion?

a) 5

b) 1

c) 7

d) 12

Discuss »

Answer: (a)

Question : 15

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

Discuss »

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 $[{sin i_A}/{sin i_B}]$

IMPORTANT general science mcq EXERCISES

set 9 Online Quiz

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1647 light thermodynamics sound optics and oscillations based general science mcq set 9 question answer pdf
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