set 9 MCQ Questions & Answers Detailed Explanation

MOST IMPORTANT general science mcq - 16 EXERCISES

Top 30,000+ General Science Memory Based Exercises

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

Questions : 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

The correct answers to the above question in:

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 $[{sin i_A}/{sin i_B}]$

Read more questions on light heat thermodynamics wave sound optics oscillation of set 9 Click Here »

Practice light, heat, thermodynamics, wave motion, sound, optics & oscillations (set 9) Online Quiz

Discuss Form

Valid first name is required.
Please enter a valid email address.
Your genuine comment will be useful for all users! Each and every comment will be uploaded to the question after approval.

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

Question : 1

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 : 2

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 : 3

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

Answer: (b)

Question : 4

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

Answer: (a)

Question : 5

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

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 : 6

A cut diamond shines brilliantly due to

a) Its molecular structure

b) Total internal reflection

c) Some inherent property

d) Absorption of light

Answer: (b)

Need More Mcqs on light, heat, thermodynamics, wave motion, sound, optics & oscillations of set 9 Click Here »
GET light, heat, thermodynamics, wave motion, sound, optics & oscillations PRACTICE TEST EXERCISES

set 1

set 2

set 3

set 4

set 5

set 6

set 7

set 8

set 9

set 10

set 11

set 12

set 13

set 14

set 15

set 16
Verbal Reasoning
Question & Answer Quiz
Non Verbal Reasoning
Question & Answer Quiz
Quantitative Aptitude
Question & Answer Quiz
Computer MCQ
Question & Answer Quiz
General English
Question & Answer Quiz
History GK
Question & Answer Quiz
Polity GK
Question & Answer Quiz
Geography GK
Question & Answer Quiz
Economy GK
Question & Answer Quiz
General Awareness GK
Question & Answer Quiz

Recently Added Subject & Categories For All Competitive Exams

100+ Quadratic Equation Questions Answers PDF for Bank

Quadratic Equation multiple choice questions with detailed answers for IBPS RRB SO. more than 250 Attitude practice test exercises for all competitive exams

03-Jul-2024 by Careericons

Continue Reading »

IBPS Aptitude Linear Equations MCQ Questions Answers PDF

Linear equations multiple choice questions with detailed answers for IBPS RRB SO. more than 250 Attitude practice test exercises for all competitive exams

03-Jul-2024 by Careericons

Continue Reading »

New 100+ Compound Interest MCQ with Answers PDF for IBPS

Compound Interest verbal ability questions and answers solutions with PDF for IBPS RRB PO. Aptitude Objective MCQ Practice Exercises all competitive exams

02-Jul-2024 by Careericons

Continue Reading »

100+ Mixture and Alligation MCQ Questions PDF for IBPS

Most importantly Mixture and Alligation multiple choice questions and answers with PDF for IBPS RRB PO. Aptitude MCQ Practice Exercises all Bank Exams

02-Jul-2024 by Careericons

Continue Reading »