Question

A pure semiconductor behaves slightly as a conductor at

(a) Room temperature

(b) Low temperature

(c) High temperature

(d) Both (b) and (c)

Answer

(a) Room temperature

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

In an electric heater 4 amp current passes for 1 minute at potential difference of 250 volt, the power of heater and energy consumed will be respectively

(a) 1 kW, 60 kJ

(b) 0.5 kW, 30 kJ

(c) 10 kW, 600 kJ

(d) None of these

A parallel-plate capacitor is connected to a battery. A metal sheet of negligible thickness is placed between the plates. The sheet remains parallel to the plates of the capacitor:
  1. The battery will supply more charge.
  2. The capacitance will increase.
  3. The potential difference between the plates will increase.
  4. Equal and opposite charges will appear on the two faces of the metal plate.

If   and   are the electric and magnetic field vectors of E.M. waves then the direction of propagation of E.M. wave is along the direction of

(a)  

(b)  

(c)  

(d) None of these

On increasing the temperature, width of forbidden gap __________ .

A PN- junction has a thickness of the order of

(a) 1 cm

(b) 1 mm

(c)  

(d)   

An ellipsometer is an instrument for.

One metallic sphere A is given positive charge whereas another identical metallic sphere B of exactly same mass as of  A is given equal amount of negative charge. Then

(a) Mass of  A and mass of  B still remain equal

(b) Mass of  A increases

(c) Mass of  B decreases

(d) Mass of  B increases

The magnetic moment of atomic neon is

(a) Zero  

(b) μB/2

(c) μB

(d) 3μB/2

The mass of a neutron is:

In the given circuit, with steady current, the potential drop across the capacitor must be

(a) V

(b) V / 2

(c) V / 3  

(d) 2V / 3