Electromagnetic Waves Test

Result

Electromagnetic Waves Test - 1

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Score
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Question 1/9
1 / -0

A flash light is covered with a filter that transmits red light. The electric field of the emerging beam is represented by a sinusoidal plane wave The average intensity of the beam will be

Correct

Wrong

Skipped
A
0.86 W / m²

Correct

Wrong

Skipped
B
1.72 W / m²

Correct

Wrong

Skipped
C
3.44 W / m²

Correct

Wrong

Skipped
D
6.88 W / m²

Solutions
Question 2/9
1 / -0

What should be the height of transmitting antenna if the T.V. telecast is to cover a radius of 128 Km

Correct

Wrong

Skipped
A
1560 m

Correct

Wrong

Skipped
B
1280 m

Correct

Wrong

Skipped
C
1050 m

Correct

Wrong

Skipped
D
79 m

Solutions
Question 3/9
1 / -0

A T.V. tower has a height of 100 m. How much population is covered by T.V. broadcast, if the average population density around the tower is 1000 / km²

Correct

Wrong

Skipped
A
39.5 × 10⁵

Correct

Wrong

Skipped
B
19.5 × 10⁶

Correct

Wrong

Skipped
C
29.5 × 10⁷

Correct

Wrong

Skipped
D
9 × 10⁴

Solutions
Question 4/9
1 / -0

An electromagnetic radiation has an energy 14.4 KeV. To which region of electromagnetic spectrum does it belong

Correct

Wrong

Skipped
A
Infra red region

Correct

Wrong

Skipped
B
Visible region

Correct

Wrong

Skipped
C
X-rays region

Correct

Wrong

Skipped
D
γ -ray region

Solutions
Question 5/9
1 / -0

In the above problem, the maximum value of magnetic field will be

Correct

Wrong

Skipped
A
2.09 × 10^-5 T

Correct

Wrong

Skipped
B
2.09 × 10^-6 T

Correct

Wrong

Skipped
C
2.09 × 10^-7 T

Correct

Wrong

Skipped
D
2.09 × 10^-8 T

Solutions
Question 6/9
1 / -0

A plane electromagnetic wave of wave intensity 6 W / m² strikes a small mirror area 40 cm², held perpendicular to the approaching wave. The momentum transferred by the wave to the mirror each second will be

Correct

Wrong

Skipped
A
6.4 × 10^-7 kg - m / s²

Correct

Wrong

Skipped
B
4.8 × 10^-8 kg - m / s²

Correct

Wrong

Skipped
C
3.2 × 10^-9 kg - m / s²

Correct

Wrong

Skipped
D
1.6 × 10^-10 kg - m / s²

Solutions
Question 7/9
1 / -0

The charge on a parallel plate capacitor is varying as . The plates are very large and close together. Neglecting the edge effects, the displacement current through the capacitor is

Correct

Wrong

Skipped
A

Correct

Wrong

Skipped
B

Correct

Wrong

Skipped
C

Correct

Wrong

Skipped
D

Solutions
Question 8/9
1 / -0

A point source of electromagnetic radiation has an average power output of 800W. The maximum value of electric field at a distance 3.5 m form the source will be

Correct

Wrong

Skipped
A
56.7 V/m

Correct

Wrong

Skipped
B
62.6 V/m

Correct

Wrong

Skipped
C
39.3 V/m

Correct

Wrong

Skipped
D
47.5 V/m

Solutions
Question 9/9
1 / -0

The value of magnetic field between plates of capacitor, at distance of 1m from centre where electric field varies by 10¹⁰ V/ m/ s will be

Correct

Wrong

Skipped
A
5.56 T

Correct

Wrong

Skipped
B
5.56 μT

Correct

Wrong

Skipped
C
5.56mT

Correct

Wrong

Skipped
D
5.56nT

Solutions

Question 1/9

0.86 W / m2

1.72 W / m2

3.44 W / m2

6.88 W / m2

Question 2/9

1560 m

1280 m

1050 m

79 m

Question 3/9

39.5 × 105

19.5 × 106

29.5 × 107

9 × 104

Question 4/9

Infra red region

Visible region

X-rays region

γ -ray region

Question 5/9

2.09 × 10-5 T

2.09 × 10-6 T

2.09 × 10-7 T

2.09 × 10-8 T

Question 6/9

6.4 × 10-7 kg - m / s2

4.8 × 10-8 kg - m / s2

3.2 × 10-9 kg - m / s2

1.6 × 10-10 kg - m / s2

Question 7/9

Question 8/9

56.7 V/m

62.6 V/m

39.3 V/m

47.5 V/m

Question 9/9

5.56 T

5.56 μT

5.56mT

5.56nT

0.86 W / m²

1.72 W / m²

3.44 W / m²

6.88 W / m²

39.5 × 10⁵

19.5 × 10⁶

29.5 × 10⁷

9 × 10⁴

2.09 × 10^-5 T

2.09 × 10^-6 T

2.09 × 10^-7 T

2.09 × 10^-8 T

6.4 × 10^-7 kg - m / s²

4.8 × 10^-8 kg - m / s²

3.2 × 10^-9 kg - m / s²

1.6 × 10^-10 kg - m / s²