Short Quiz

Question 1 of 5

CBSE Past Year 2026

An electromagnetic wave passes from vacuum into a dielectric medium with relative electrical permittivity (3/2) and relative magnetic permeability (8/3). Then, its

A wavelength is doubled and frequency remains unchanged. B wavelength is doubled and frequency is halved. C wavelength is halved and frequency remains unchanged. D wavelength and frequency both will remain unchanged.

Select one option. Answers are shown after the test.

Question 2 of 5

CBSE Past Year 2026

Electromagnetic waves used in a diagnostic tool in medicine have a wavelength range

A 1 nm to \(10^{–3}\) nm B 400 nm to 1 nm C 1 mm to 700 nm D 0.1 m to 1 mm

Select one option. Answers are shown after the test.

Question 3 of 5

CBSE Past Year 2026

The magnetic field in a plane electromagnetic wave travelling in glass (n = 1·5) is given by

\(B_{y}\) = (2 × \(10^{–7}\) T) sin (αx + 1·5 × \(10^{11}\) t)

where x is in metres and t is in seconds. The value of α is :

A

0·5 × \(10^{3}\) \(m^{–1}\)

B

6·0 × \(10^{2}\) \(m^{–1}\)

C

7·5 × \(10^{2}\) \(m^{–1}\)

D

1·5 × \(10^{3}\) \(m^{–1}\)

Select one option. Answers are shown after the test.

Question 4 of 5

CBSE Past Year 2026

A plane electromagnetic wave travels through a medium and the magnetic field associated with it is given by

\[B=5\times10^{-8}\sin(3\times10^{10}t-150x)\;\mathrm{T}\]

where x is in metres and t is in seconds.

The velocity of the wave is:

A \(2.0\times10^8\;\mathrm{m\,s^{-1}}\) B \(4.5\times10^7\;\mathrm{m\,s^{-1}}\) C \(3.5\times10^7\;\mathrm{m\,s^{-1}}\) D \(2.5\times10^8\;\mathrm{m\,s^{-1}}\)

Select one option. Answers are shown after the test.

Question 5 of 5

CBSE Past Year 2026

The ratio of amplitude of electric field to the amplitude of the magnetic field associated with an electromagnetic wave propagating in glass (n = 1·5) is :

A 3 × \(10^{8}\) m\(s^{−1}\) B 2 × \(10^{8}\) m\(s^{−1}\) C 3·3 × \(10^{−9}\) m\(s^{−1}\) D 5 × \(10^{−9}\) m\(s^{−1}\)

Select one option. Answers are shown after the test.

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