MCQ
Microwaves are electromagnetic waves with frequency in the range of:
  • A
    Micro hertz
  • B
    Giga hertz
  • C
    Mega hertz
  • D
    Hertz

Answer

  1. Giga hertz

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Nuclear fusion reactions cannot be harnessed for productive applications because:

When light rays are incident on a prism at an angle of 45°, the minimum deviation is obtained. If refractive index of the material of prism is , then the angle of prism will be

(a) 30°

(b) 40°

(c) 50°

(d) 60°

Among the two interfering monochromatic sources A and B; A is ahead of B in phase by 66°. If the observation be taken from point P, such that PB – PA = l/4. Then the phase difference between the waves from A and B reaching P is

(a) 156°

(b) 140°

(c) 136°

(d) 126°

In the absence of other conductors, the surface charge density

(a) Is proportional to the charge on the conductor and its surface area

(b) Inversely proportional to the charge and directly proportional to the surface area

(c) Directly proportional to the charge and inversely proportional to the surface area

(d) Inversely proportional to the charge and the surface area

If each resistance in the figure is of 9 W then reading of ammeter is        

(a) 5 A

(b) 8 A

(c) 2 A

(d) 9 A

A rod of legth l rotates with a uniform angular velocity $\omega$ about its perpendicular bisector. A uniform magnetic field B exists parallel to the axis of rotation. The potential difference between the two ends of the rod is:
  1. $\text{zero}$
  2. $\frac{1}{2}\text{Bl}\omega^2$
  3. $\text{Bl}\omega ^2$
  4. $2\text{B}\text{l}\omega^2$ 

Vibration magnetometer before use, should be set

(a) In magnetic meridian

(b) In geographical meridian

(c) Perpendicular to magnetic meridian

(d) In any position

Current is flowing in two parallel good conducting wires in the same direction. They will

In Thomson spectrograph experiment, four positive ions P,Q,R and S are situated on Y-X curve a shown in the figure

(a) The specific charge of R and S are same

(b) The masses of P and S are same

(c) The specific charges of Q and R are same

(d) The velocities of R and S are same

A 2 MeV proton is moving perpendicular to a uniform magnetic field of 2.5 tesla. The force on the proton is

(a) 2.5

(b) 7.6   

(c) 2.5   

(d) 7.6