MCQ
Holes are created when:
  • A
    Electric discharge causes damage to semicondcutors.
  • B
    There are too many electrons.
  • C
    A co-valent bond is broken due to thermal energy, the removal of one electron leaves a vacancy.
  • D
    None of these

Answer

  1. A co-valent bond is broken due to thermal energy, the removal of one electron leaves a vacancy.

Explanation:

Holes are created when a co-valent bond is broken due to thermal energy. The removal of one electron leaves a vacancy known as a hole.

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

The work function of metal is 1 eV. Light of wavelength 3000 Å is incident on this metal surface. The velocity of emitted photo-electrons will be

(a) 10 m/sec

(b) 1  m/sec

(c)  m/sec

(d)  m/sec

If a 0.1 % increase in length due to stretching, the percentage increase in its resistance will be

(a) 0.2 %

(b) 2 %

(c) 1 %

(d) 0.1 %

A magnet is made to oscillate with a particular frequency, passing through a coil as shown in figure. The time variation of the magnitude of e.m.f. generated across the coil during one cycle is

(a)

(b)

(c)

(d)

Electric conduction takes place in a discharge tube due to the movement of:
  1. Positive ions.
  2. Negative ions.
  3. Electrons.
  4. Protons.
Which of the following statements related to static electricity is not true?

The basic magnetization curve for a ferromagnetic material is shown in figure. Then, the value of relative permeability is highest for the point

(a) P

(b) Q

(c) R

(d) S

In the depletion region of a diode:
The AC voltage across a resistance can be measured using:
  1. A potentiometer.
  2. A hot-wire voltmeter.
  3. A moving-coil galvanometer.
  4. A moving-magnet galvanometer.

A conducting circular loop of radius r carries a constant current i. It is placed in a uniform magnetic field , such that   is perpendicular to the plane of the loop. The magnetic force acting on the loop is

(a) ir 

(b) 2πri 

(c) Zero

(d) πri 

The earth's magnetic field at a certain place has a horizontal component 0.3 Gauss and the total strength 0.5 Gauss. The angle of dip is

(a)  

(b)

(c)

(d)