Question
Choose the correct statement(a) When we heat a semiconductor its resistance increases (b) When we heat a semiconductor its resistance decreases (c) When we cool a semiconductor to 0 K then it becomes super conductor(d) Resistance of a semiconductor is independent of temperature
 
 
 
 

Answer

(b) When we heat a semiconductor its resistance decrease

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 magnetic field of earth is due to(a) Motion and distribution of some material in and outside the earth(b) Interaction of cosmic rays with the current of earth(c) A magnetic dipole buried at the centre of the earth(d) Induction effect of the sun
 
 
 
 
Rest mass energy of an electron is 0.51 MeV. If this electron is moving with a velocity 0.8 c (where c is velocity of light in vacuum), then kinetic energy of the electron should be.(a) 0.28 MeV(b) 0.34 MeV(c) 0.39 MeV(d) 0.46 MeV
       
The rest mass of the photon is (a) 0(b) ∞(c) Between 0 and ∞(d) Equal to that of an electron
   
   
A convex lens of focal length 84 cm is in contact with a concave lens of focal length 12 cm. The power of combination (in diopters) is(a) 25/24 (b) 25/18(c) – 50/7(d) + 50/7
       
If the current is doubled, the deflection is also doubled in:
Which one of the following statements is true(a) An object situated at the principle focus of a concave lens will have its image formed at infinity(b) Concave mirror can give diminished virtual image(c) Given a point source of light, a convex mirror can produce a parallel beam of light(d) The virtual image formed in a plane mirror can be photographed
 
 
 
 
A 60 watt bulb operates on 220V supply. The current flowing through the bulb is(a) 11/3 amp(b) 3/11 amp(c) 3 amp     (d) 6 amp
       
The peak voltage in a 220V AC source is:
  1. 220V.
  2. About 160V.
  3. About 310V.
  4. 440V.
The drift current in a p-n junction is from the:
Which of the following logic gate is an universal gate(a) OR(b) NOT(c) AND(d) NOR