JEE Main 2023 (Online) 31st January Evening Shift | Electromagnetic Waves Question 45 | Physics

1

JEE Main 2023 (Online) 31st January Evening Shift

MCQ (Single Correct Answer)

+4

-1

Match List I with List II

LIST I		LIST II
A.	Microwaves	I.	Physiotherapy
B.	UV rays	II.	Treatment of cancer
C.	Infra-red light	III.	Lasik eye surgery
D.	X-ray	IV.	Aircraft navigation

Choose the correct answer from the options given below:

A

A - IV, B - III, C - I, D - II

B

A - II, B - IV, C - III, D - I

C

A - III, B - II, C - I, D - IV

D

A - IV, B - I, C - II, D - III

2

JEE Main 2023 (Online) 30th January Evening Shift

MCQ (Single Correct Answer)

+4

-1

A point source of $100 \mathrm{~W}$ emits light with $5 \%$ efficiency. At a distance of $5 \mathrm{~m}$ from the source, the intensity produced by the electric field component is:

A

$\frac{1}{40 \pi} \frac{W}{m^2}$

B

$\frac{1}{10 \pi} \frac{W}{m^2}$

C

$\frac{1}{20 \pi} \frac{W}{m^2}$

D

$\frac{1}{2 \pi} \frac{W}{m^2}$

3

JEE Main 2023 (Online) 29th January Evening Shift

MCQ (Single Correct Answer)

+4

-1

Given below are two statements :

Statement I : Electromagnetic waves are not deflected by electric and magnetic field.

Statement II : The amplitude of electric field and the magnetic field in electromagnetic waves are related to each other as $${E_0} = \sqrt {{{{\mu _0}} \over {{\varepsilon _0}}}} {B_0}$$.

In the light of the above statements, choose the correct answer from the options given below :

A

Both Statement I and Statement II are true

B

Statement I is true and Statement II is false

C

Both Statement I and Statement II are false

D

Statement I is false but Statement II is true

4

JEE Main 2023 (Online) 29th January Morning Shift

MCQ (Single Correct Answer)

+4

-1

Which of the following are true?

A. Speed of light in vacuum is dependent on the direction of propagation.

B. Speed of light in a medium is independent of the wavelength of light.

C. The speed of light is independent of the motion of the source.

D. The speed of light in a medium is independent of intensity.

Choose the correct answer from the options given below:

A

B and D only

B

B and C only

C

A and C only

D

C and D only