The dimension of \(\frac { 1 }{ { \mu }_{ 0 }{ \varepsilon }_{ 0 } } \) is _____.

(a)

[LT^-1]

(b)

[L²T^-2]

(c)

[L^-1T]

(d)

[L^-2T²]

Which of the following electromagnetic radiations is used for viewing objects through fog 

(a)

microwave

(b)

gamma rays

(c)

X- rays

(d)

infrared

If the magnetic monopole exists, then which of the Maxwell’s equation to be modified?

(a)

\(\oint { \vec { E } .d\vec { A } } =\frac { { Q }_{ enclosed } }{ { \in }_{ 0 } } \)

(b)

\(\oint { \vec { B } .d\vec { A } } \) = 0

(c)

\(\oint { \vec { B } .d\vec { l } } ={ \mu }_{ 0 }{ i }_{ c}+{ \mu }_{ 0 }{ \in }_{ 0 }\frac { d }{ dt } \oint_s { \vec { E } .d\vec { A } } \)

(d)

\(\oint { \vec { E } .d\vec { l } } =-\frac { d }{ dt } { \Phi }_{ B }\)

Which of the following is an electromagnetic wave?

(a)

α - rays

(b)

β - rays

(c)

\(\gamma\) - rays

(d)

all of them

If E = E_o sin[10⁶ x -ωt] be the electric field of a plane electromagnetic wave, the value of ω is_____.

(a)

0.3 x 10⁻¹⁴ rad s⁻¹

(b)

3 x 10⁻¹⁴ rad s⁻¹

(c)

0.3 x 10¹⁴ rad s⁻¹

(d)

3 x 10¹⁴ rad s^-1

The electric and magnetic fields of an electromagnetic wave are _____.

(a)

in phase and perpendicular to each other

(b)

out of phase and not perpendicular to each other

(c)

in phase and not perpendicular to each other

(d)

out of phase and perpendicular to each other

Who produced the electromagnetic waves first?

(a)

J.C.Bose

(b)

Marconi

(c)

Maxwell

(d)

Hertz

Electromagnetic waves are produced by _____________.

(a)

static charge

(b)

moving charge

(c)

an accelerating charge

(d)

chargeless particles

Which of the following E.M waves has the longest wavelength?

(a)

Radio waves

(b)

IR

(c)

X-rays

(d)

visible

The EM waves do not transport _______________.

(a)

energy

(b)

charge

(c)

momentum

(d)

information

If the velocity of light in a medium is 2.25 x 10⁸ ms^-1 then the refractive index of the medium will be _______________.

(a)

1.5

(b)

0.5

(c)

1.33

(d)

1.73

Dimensions of \(\frac { 1 }{ { \mu }_{ 0 }{ \varepsilon }_{ 0 } } \) is _____________.

(a)

\(\frac { { L }^{ 2 } }{ { T }^{ 2 } } \)

(b)

\(\frac { { T }^{ 2 } }{ { L }^{ 2 } } \)

(c)

\(\frac { T }{ L } \)

(d)

\(\frac { L }{ T } \)

The wavelength of electromagnetic wave produced by Hertz experiment was _____________.

(a)

6mm

(b)

60m

(c)

6000 mm

(d)

60 cm

If V_g, V_x, V_m are speeds of gamma rays, X rays and microwaves respectively in vacuum, then ______________.

(a)

V_g x m

(b)

V_g > V_k > V_m

(c)

V_g > V_x < V_m

(d)

V_g= V_x= V_m

Television waves range from ______________.

(a)

54 MHz to 89 MHz

(b)

54 MHz to 890 MHz

(c)

54 MHz to 89 MHz

(d)

54 MHz to 80 MHz

Which of the following can be used to take photograph over long distance of ____________.

(a)

White light

(b)

U- V radiation

(c)

I-R radiation

(d)

Microwaves

Which one of the following groups of electromagnetic waves is in order of increasing frequency?

(a)

Microwaves U-V rays, X-rays

(b)

Radio waves, visible light and 1-R rays

(c)

gamma rays U-V rays radio waves

(d)

gamma rays, U-V rays radio waves

The spectra used for making dyes is _____________.

(a)

line spectra

(b)

continuous absorption spectra

(c)

fraunhofer spectra

(d)

band absorption spectra

The central core of the sun is called _______________.

(a)

chromosphere

(b)

stratosphere

(c)

photosphere

(d)

thermo sphere

The sun's outer layer is called _______.

(a)

chromosphere

(b)

exosphere

(c)

Photosphere

(d)

stratosphere