Question

GaAs is

(a) Element semiconductor

(b) Alloy semiconductor

(c) Bad conductor

(d) Metallic semiconductor

Answer

(b) Alloy semiconductor

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 pure semiconductor behaves slightly as a conductor at

(a) Room temperature

(b) Low temperature

(c) High temperature

(d) Both (b) and (c)

If the velocity of a charged particle is made twice and that of magnetic field is made half then the radius of the circular path of the charged particle in the magnetic field will become :

The material of wire of potentiometer is

(a) Copper

(b) Steel

(c) Manganin

(d) Aluminium

When $10^{19}$ electrons are removed from a neutral metal plate, the electric charge on it is
The equation of a light wave is written as $\text{y}=\text{A}\ \sin(\kappa\text{x}-\omega\text{t}).$ Here, y represents:

Light of wavelength l = 5000 Å falls normally on a narrow slit. A screen placed at a distance of 1 m from the slit and perpendicular to the direction of light. The first minima of the diffraction pattern is situated at 5 mm from the centre of central maximum. The width of the slit is

(a) 0.1 mm

(b) 1.0 mm

(c) 0.5 mm

(d) 0.2 mm

The electric field near a conducting surface having a uniform surface charge density σ  is given by

(a)  and is parallel to the surface

(b)  and is parallel to the surface

(c)  and is normal to the surface

(d)  and is normal to the surface

A proton beam is going from north to south and an electron beam is going from south to north. Neglecting the earth's magnetic field, the electron beam will be deflected

In a certain charge distribution, all points having zero potential can be joined by a circle S. Points inside S have positive potential and points outside S have negative potential. A positive charge, which is free to move, is placed inside S

(a) It will remain in equilibrium

(b) It can move inside S, but it cannot cross S

(c) It must cross S at some time

(d) It may move, but will ultimately return to its starting point

A circular loop of area 1cm2, carrying a current of 10A, is placed in a magnetic field of 0.1T perpendicular to the plane of the loop. The torque on the loop due to the magnetic field is:
  1. Zero
  2. 104N-m
  3. 102N-m
  4. 1N-m