MCQ
 What is the full form of UHF?
  • A
    Under heavy frequency
  • B
    Ultra-high frequency
  • C
    Ultra heavy frequency
  • D
    Under high frequency

Answer

  1. Ultra-high frequency

Explanation:

UHF stands for Ultra high frequency. Cellular phones used radio waves to transmit voice communication in the Ultra high-frequency Band. The UHF band extends from 900 MHz to 5 x 109 Hz or 5000 MHz. Radio waves are produced by oscillating circuits having an inductor and capacitor.

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

A rectangular loop carrying a current i1​, is situated near a long straight wire carrying a steady current i2​. The wire is parallel to one of the sides of the loop and is in the plane of the loop as shown in the figure. Then the current loop will:

There is no hole current in conductors, because they have:
When a metal plate is introduced between the two plates of a charged capacitor and insulated from them, then which of following statement(s) is/ are correct?
  1. The metal plate divides the capacitor into two capacitors connected in parallel to each other.
  2. The metal plate divides the capacitors into two capacitors connected in series with each other.
  3. The metal plate is equivalent to a dielectric of zero dielectric constant.

A prism having an apex angle 4o and refraction index 1.5 is located in front of a vertical plane mirror as shown in figure. Through what total angle is the ray deviated after reflection from the mirror

(a) 176o

(b) 4o

(c) 178o

(d) 2o  

The potential at a distance R/2 from the centre of a conducting sphere of radius R will be

(a) 0 

(b)  

(c)  

(d)

Two satellites A and B move round the earth in the same orbit. The mass of B is twice the mass of A:
  1. Speeds of A and B are equal.
  2. The potential energy of earth +A is same as that of earth +B.
  3. The kinetic energy of A and B are equal.
  4. The total energy of earth +A is same as that of earth +B.
A particle of mass 'm' and charge 'q' enters in an uniform magnetic field B perpendicularly. The radius of its path will be :

The refractive index of flint glass for blue F line is 1.6333 and red C line is 1.6161. If the refractive index for yellow D line is 1.622, the dispersive power of the glass is

(a) 0.0276

(b) 0.276

(c) 2.76

(d) 0.106

A capacitor of capacitance C is charged to a potential V. The flux of the electric field through a closed surface enclosing the capacitor is:
  1. $\frac{\text{CV}}{\in_0}$
  2. $\frac{\text{2CV}}{\in_0}$
  3. $\frac{\text{CV}}{2\in_0}$
  4. $\text{Zero}.$

A conducting loop carrying a current I is placed in a uniform magnetic field pointing into the plane of the paper as shown. The loop will have a tendency to

(a) Contract

(b) Expand

(c) Move towards +ve x –axis

(d) Move towards –ve x-axis