Electromagnetic Waves  MCQs

MCQs of Electromagnetic Waves

Showing 101 to 110 out of 112 Questions
7 8 9 10 11 12
101.
The components E→ and B→ of electromagnetic waves near the spark gap are called _____ components in Hertz's experiment.
(a) inductive
(b) radiated
(c) electric
(d) magnetic
Answer:

Option (a)

102.
Here are the physical quantities associated with electromagnetic waves. Find one of them having zero average value over one period.
(a) Electric field
(b) Electric energy
(c) Magnetic energy
(d) Electric energy density
Answer:

Option (a)

103.
Give the dimensional formula of permeability of vacuum.
(a) M 1 L-1 T -2 A -2
(b) M 1 L1 T -2 A -2
(c) M 1 L2 T -2 A -2
(d) M 1 L1 T -1 A -1
Answer:

Option (b)

104.
Velocity of electromagnetic waves in a medium is _____ .
(a) v = 1μ0ε0
(b) v = 1μrεr
(c) v = 1μrε0
(d) v = 1μ0ε0μrεr
Answer:

Option (d)

105.
The intensity of electromagnetic waves and energy density is I and ρ respectively. What would be the velocity of the waves ?
(a) c = I ρ
(b) c =Iρ
(c) c =ρI
(d) c =I ρ
Answer:

Option (b)

106.
Jagdish chandra Bose generated electromagnetic waves having wavelength in the range of _____ .
(a) 25 mm to 50 mm
(b) 5 mm to 50 mm
(c) 25 mm to 75 mm
(d) 5 mm to 25 mm
Answer:

Option (d)

107.
Give the name of the scientist who transmitted electromagnetic waves to several miles.
(a) Hertz
(b) Maxwell
(c) Marconi
(d) Jagdish chandra Bose
Answer:

Option (c)

108.
Which of the following is not a property of light ?
(a) It requires a material medium for propogation.
(b) It can travel through vacuum.
(c) It involves transportation of energy.
(d) None of the above
Answer:

Option (a)

109.
Water molecules are found generally in the _____ Layer of the atmosphere.
(a) upper most
(b) lower most
(c) middle
(d) every
Answer:

Option (b)

110.
Wavelengths of some electromagnetic waves are given below. Arrange them in decreasing order.

Short radio waves - λ1, Micro waves - λ2, Ultraviolet waves - λ3

(a) λ1, λ3, λ2
(b) λ1, λ2, λ3
(c) λ3, λ2, λ1
(d) λ2, λ1, λ3
Answer:

Option (b)

Showing 101 to 110 out of 112 Questions
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