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

Assertion :   An electron is not deflected on passing through certain region of space. This observation confirms that there is no magnetic field in that region.

Reason     : The deflection of electron depends on angle between velocity of electron and direction of magnetic field.

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c) If assertion is true but reason is false.

(d) If assertion is false but reason is true.

A 100 V voltmeter of internal resistance 20 kQ in series with a high resistance R is connected to a 110 V line. The voltmeter reads 5 V, the value of R is

(a) 210 kΩ

(b) 315 kΩ

(c) 420 kΩ

(d) 440 kΩ

Figure shows the position of a particle moving on the X-axis as a function of time.

  1. The particle has come to rest 6 times.
  2. The maximum speed is at t = 6s.
  3. The velocity remains positive for t = 0 to t = 6s.
  4. The average velocity for the total period shown is negative.

Lateral displacement of the emergent ray of light increases with:

Three capacitors of capacitance 3 μF , 10 μF and 15 μF  are connected in series to a voltage source of 100V. The charge on 15 μF is

(a) 50 μC

(b) 100 μC

(c) 200 μC

(d) 280 μC

Immiscible transparent liquids A, B, C, D and E are placed in a rectangular container of glass with the liquids making layers according to their densities. The refractive index of the liquids are shown in the adjoining diagram. The container is illuminated from the side and a small piece of glass having refractive index 1.61 is gently dropped into the liquid layer. The glass piece as it descends downwards will not be visible in

(a) Liquid A and B only

(b) Liquid C only

(c) Liquid D and E only

(d) Liquid A, B, D and E

If instantaneous magnetic flux in a coil is $BA \cos \omega t$, then magnitude of induced emf in the coil is :

If a lens is cut into two pieces perpendicular to the principal axis and only one part is used, the intensity of the image

(a) Remains same

(b)  times

(c) 2 times

(d) Infinite

The angle of dip at a place is 40.6o and the intensity of the vertical component of the earth's magnetic field V = 6  Tesla. The total intensity of the earth's magnetic field (I) at this place is

(a) 7 Tesla

(b) 6 Tesla

(c) 5  Tesla

(d) 9.2  Tesla