Wave Optics Test

Result

Wave Optics Test - 47

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Weekly Quiz Competition

Question 1
4 / -1

Maxwell in his famous equation of electromagnetism introduced the concept of

A
a.c. current

B
d.c. current

C
Displacement current

D
Impedance
Question 2
4 / -1

A signal emitted by an antenna from a certain point can be received at another point of the surface in the form of

A
Sky wave

B
Ground wave

C
Sea wave

D
Both (a) and (b)
Question 3
4 / -1

Approximate height of ozone layer above the ground is

A
60 to 70 km

B
59 km to 80 km

C
70 km to 100 km

D
100 km to 200 km
Question 4
4 / -1

The electromagnetic waves do not transport

A
Energy

B
Charge

C
Momentum

D
Information
Question 5
4 / -1

An electromagnetic wave, going through vacuum is described by E = E₀ sin (kx – ωt); Which of the following is independent of wavelength?

A
k

B
ω

C
k/ω

D
kω

Solution
Question 6
4 / -1

An electromagnetic wave, going through vacuum is described by E = E₀ sin (kx – ωt); B = B₀ sin(kx – ωt). Which of the following equations is true?

A
E₀k = B₀ω

B
E₀ω = B₀k

C
E₀ B₀ = ωk

D
None of these

Solution
Question 7
4 / -1

A plane electromagnetic wave travels in free space along x–axis. At a particular point in space, the electric field along y-axis is 9.3 Vm^–1. The magnetic induction (B) along z-axis is

A
3.1 × 10^–8 T

B
3 × 10^–8 T

C
3 × 10^–6 T

D
9.3 × 10^–6 T

Solution
Question 8
4 / -1

A radio receiver antenna that is 2 m long is oriented along the direction of the electromagnetic wave and receives a signal of intensity 5 × 10^–16 W/m². The maximum instantaneous potential difference across the two ends of the antenna is

A
1.23 µV

B
1.23 mV

C
1.23 V

D
12.3 mV

Solution
Question 9
4 / -1

A point source of electromagnetic radiation has an average power output of 1500 W. The maximum value of electric field at a distance of 3m from this source in Vm^–1 is

A
500

B
100

C

D
Question 10
4 / -1

An electromagnetic wave of frequency v = 3.0 MHz passes from vacuum into a dielectric medium with relative permittivity ε_r = 4.0. Then

A
Wavelength is doubled and the frequency remains unchanged

B
Wavelength is doubled and frequency becomes half

C
Wavelength is halved and frequency remains unchanged

D
Wavelength and frequency both remain unchanged

Solution