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Which of the following radiations has the least wavelength
1.  $\gamma -rays$
2.  $\beta -rays$
3.  $\alpha -rays$
4.  X-rays 

Which of the following are not electromagnetic waves
1.  Cosmic rays
2.  Gamma rays
3.  $\gamma$-rays
4.  X-rays 

The electromagnetic waves travel with a velocity
1.  Equal to velocity of sound
2.  Equal to velocity of light
3.  Less than velocity of light
4.  None of these 

Electromagnetic radiation of highest frequency is 
1.  Infrared radiations
2.  Visible radiation
3.  Radio waves
4.  $\gamma$-rays
 

If $\overrightarrow{E}$ and $\overrightarrow{B}$ are the electric and magnetic field vectors of e.m. waves then the direction of propagation of e.m wave is along the direction of
1.  $\overrightarrow{E}$
2.  $\overrightarrow{B}$
3.  $\overrightarrow{E}$ x $\overrightarrow{B}$
3.  None of these 

Heat radiations propagate with the speed of
1.  $\mathrm{\alpha }-\mathrm{rays}$
2.  $\beta -\mathrm{rays}$
3.  Light waves
4.  Sound waves 

If a source is transmitting an electromagnetic wave of frequency $8.2 \times {10}^6 Hz$, then the wavelength of the electromagnetic waves transmitted from the source will be 
1.  36.6 m
2.  40. 5 m
3.  42.3 m
4.  50.9 m

In an electromagnetic wave, the electric and magnetizing fields are 100$V m^{-1}$ and 0.265 $A{m}^{-1}$. The maximum energy flow is
1.  $26.5 W/m^2$
2.  $36.5 W/m^2$
3.  $46.5 W/m^2$
4.  $765 W/m^2$

Maxwell's equation describes the fundamental laws of:

Which of the following rays has a minimum frequency
1.  U.V. rays
2.  X-rays
3.  Microwaves
4.  Infrared rays
 

The energy of E.M. wave is due to their 
1.  Wavelength
2.  Frequency
3.  The electric and magnetic field
4.  None of these 

An electromagnetic wave travels along the z-axis. Which of the following pairs of space and time-varying fields would generate such a wave
1.  $E_x, B_y$
2.  $E_y, B_x$
3.  $E_z, B_x$
4.  $E_y, B_z$

Speed c of E.M. waves through a vacuum is given by
1.  $c = \sqrt{{\mu }_0{\epsilon }_0}$
2.  $c = \frac{1}{\sqrt{{\mu }_0{\epsilon }_0}}$
3.  $c = \sqrt{\frac{{\mu }_0}{{\epsilon }_0}}$
4.  $c = \sqrt{\frac{{\epsilon }_0}{{\mu }_0}}$

A plane electromagnetic wave is an incident on a material surface. If the wave delivers momentum p and energy E, then 
1.  p = 0, E = 0
2.  p $\ne$ 0, E $\ne$ 0
3.  p $\ne$ 0, E = 0
4.  p = 0, E $\ne$ 0

In a plane E.M. wave, the electric field oscillates sinusoidal at a frequency of 2.0$\times$ 10${}^{10}$
Hz  and amlitude 48Vm${}^{-1}$ The wavelength of the wave is 
1. 24$\times$ 10${}^{10}$ m
2. 1.5$\times$ 10${}^{-2}$ m
3. 4.16$\times$ 10${}^8$ m 
4. 3$\times$ 10${}^8$ m

The displacement current was first postulated by:
1.  Ampere
2.  Maxwell
3.  Hertz
4.  Marconi

Which of the following pairs of space and time-varying E and B fields would generate a plane electromagnetic wave travelling in the Z - direction
1.  $E_x, B_y$
2.  $E_y, B_x$
3.  $E_x, B_z$
4.  $E_z, B_x$

Microwaves are used for?
1.  television
2.  radio transmission
3.  radar system
4.  all the above 

Greenhouse effect keeps the earth surface
1.  cold in night
2.  dusty and cold
3.  warm in night
4.  moist in night 

A capacitor has two circular plates each of radius R. held at a small separation such
that the capacitor is being charged by a battery What is the displacement current thorough a loop of radius $\frac{3}{4}$ R, held paralled to the plates inside the capacitor
symmaetrically. When current supplied by battery is 'i'
1. i 
2. $\frac{3i}{4}$
3. $\frac{9i}{16}$
4. $\frac{7 i}{16}$