Download App

Semiconductor Electronic: Material, Devices And Simple Circuits — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsSemiconductor Electronic: Material, Devices And Simple Circuits1 Mark
MCQ
In intrinsic semiconductors:
  • A
    n > p
  • B
    p > n
  • C
    n = p
  • D
    n = 0
✓

Answer

  1. n = p

Explanation:

Intrinsic semiconductors are pure ones. Hence there is no question of impurity. Valence band is the range of energy of electrons which are in the valence shell of the atoms of a substance. Conduction band is the range of energy of electrons which are free and available for conduction.

At room temperature, some electrons of intrinsic semiconductors get excited and reach the conduction band. During this process, the electrons leave empty spaces in the valence shell. These empty spaces are known as holes in a semiconductor. Number of free electrons (n) is equal to the number of holes (p).

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

Explore more

More "M.C.Q [1M]" from Semiconductor Electronic: Material, Devices And Simple Circuits→Semiconductor Electronic: Material, Devices And Simple Circuits — all question types→Physics STD 12 Science question papers→Bihar Board STD 12 Science question papers→Bihar Board question paper generator→

Similar questions

A proton of energy 200 MeV enters the magnetic field of 5 T. If direction of field is from south to north and motion is upward, the force acting on it will be

(a) Zero  

(b) 1.6  

(c) 3.2  

(d) 1.6  
→

Hydrogen (H), deuterium (D), singly ionized helium ( and doubly ionized lithium (Li) all have one electron around the nucleus. Consider n =2 to n = 1 transition. The wavelengths of emitted radiations are  and   respectively. Then approximately

(a)  

(b) 4

(c)  

(d)    
→

If an electron enters a magnetic field with its velocity pointing in the same direction as the magnetic field, then

(a) The electron will turn to its right

(b) The electron will turn to its left

(c) The velocity of the electron will increase

(d) The velocity of the electron will remain unchanged
→

A thin lens is made with a material having refractive index $\mu=1.5.$ Both the sides are convex. It is dipped in water $(\mu=1.33).$ It will behave like:

→

An electric dipole is placed in an electric field generated by a point charge

(a) The net electric force on the dipole must be zero

(b) The net electric force on the dipole may be zero

(c) The torque on the dipole due to the field must be zero

(d) The torque on the dipole due to the field may be zero
→
Capacity of any condenser does not depend upon :
→
The net resistance of a voltmeter should be large to ensure that:
  1. It  does not get overheated.
  2. It does not draw excessive current.
  3. It can measure large potential differences.
  4. It does not appreciably change the potential difference to be measured.
→

Before the saturation state of a diode at the plate voltages of 400 V and 200 V respectively the currents are i1 and i2 respectively. The ratio i1/i2 will be

(a)  

 (b) 2 

 (c) 2  

 (d) 1/2
→
The acceleration of the moon just before it strikes the earth in the previous question is:
  1. 10ms-2
  2. 0.0027ms-2
  3. 6.4ms-2
  4. 5.0ms-2
→
Ideal $P - N$ junction can be used :
→