Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.
Advertisement

 Multiple Choice QuestionsMultiple Choice Questions

Advertisement
1.

During the propagation of electromagnetic waves in a medium:

  • Electric energy density is equal to the magnetic energy density.

  • Both electric and magnetic energy densities are zero.

  • Electric energy density is double of the magnetic energy density.

  • Electric energy density is double of the magnetic energy density.

187 Views

2.

An electromagnetic wave in vaccum has the electric and magnetic fields straight E with rightwards arrow on top and straight B with rightwards arrow on topwhich are always perpendicular to each other. the direction of polarisation is given by straight x with rightwards arrow on top and that of wave propagation by straight k with rightwards arrow on top then

  • straight X with rightwards arrow on top vertical line vertical line straight B with rightwards arrow on top space and space straight X with rightwards arrow on top vertical line vertical line straight B with rightwards arrow on top space straight x space straight E with rightwards arrow on top
  • straight X with rightwards arrow on top vertical line vertical line straight E with rightwards arrow on top space and straight k with rightwards arrow on top vertical line vertical line space straight E with rightwards arrow on top straight x straight B with rightwards arrow on top
  • straight X with rightwards arrow on top vertical line vertical line straight B with rightwards arrow on top space and space straight k with rightwards arrow on top vertical line vertical line straight E with rightwards arrow on top space straight x straight B with rightwards arrow on top
  • straight X with rightwards arrow on top vertical line vertical line straight B with rightwards arrow on top space and space straight k with rightwards arrow on top vertical line vertical line straight E with rightwards arrow on top space straight x straight B with rightwards arrow on top
203 Views

3.

The threshold frequency for a metallic surface corresponds to an energy of 6.2 eV, and the stopping potential for a radiation incident on this surface 5 V. The incident radiation lies in

  • X-ray region

  • ultra-violet region

  • infra-red region

  • infra-red region

457 Views

4.

The direction of propagation of electromagnetic wave is along

  • Electric field vector, E

  • Magnetic field vector, B

  • E . B

  • E × B


Advertisement
5.

Assume that a radio station is about 200 km away at your location and the station operates 972 kHz. How long does it take for an electromagnetic signal to travel from the station to you and how many wave crests does it send out per second ?

  • 666 µs and 9.72 × 105 crests per second

  • 666 µs and 972 × 105 crests per second

  • 555 µs and 97.2 × 107 crests per second

  • 555 µs and 0.972 × 105 crests per second


6.

The electric field portion of an electromagnetic wave is given by (all variables in SI units) E = 10-4 sin(6 x 105 t − 0.01 x). The frequency (f) and the speed (v) of electromagnetic wave are

  • f = 30/π kHz and v = 1.5 × 107 m/s

  • f = 90/π kHz and v = 6.0 × 107 m/s

  • f = 300/π kHz and v = 6.0 × 107 m/s

  • f = 600/π kHz and v = 7.5 × 107 m/s


7.

γ-rays are detected by

  • point contact diodes

  • thermopiles

  • ionization chamber

  • photocells


8.

If the directions of electric and magnetic field vectors of a plane electromagnetic wave are along positive y- direction and positive z-direction respectively, then the direction of propagation of the wave is along

  • positive z-direction

  • negative z-direction

  • negative y-direction

  • positive x-direction


Advertisement
9.

The amplitudes E0 and B0 of electric and the magnetic component of an electromagnetic wave respectively are related to the velocity c in vacuum as

  • E0B0 = 1c

  • E0 = cB0

  • B0 = cE0

  • E0 = cB0


10.

Identify the mismatched pair.

  • Microwaves  —  Aircraft navigation

  • Radio waves  —  Cellular phone

  • γ rays   —  Klystron

  • Ultraviolet rays   —  LASIK


Advertisement