Download App

Electronics — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsElectronics1 Mark
Question

Assertion :  Electron has higher mobility than hole in a semiconductor.

Reason     : Mass of electron is less than the mass of hole.

(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 the assertion and reason both are false.

✓

Answer

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

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 Electronics→Electronics — all question types→Physics STD 12 Science question papers→Bihar Board STD 12 Science question papers→Bihar Board question paper generator→

Similar questions

A particle moves in a region having a uniform magnetic field and a parallel, uniform electric field. At some instant, the velocity of the particle is perpendicular to the field direction. The path of the particle will be:
  1. A straight line.
  2. A circle.
  3. A helix with uniform pitch.
  4. A helix with nonuniform pitch.
→

A potential difference of 2V is applied between the opposite faces of a Ge crystal plate of area 1 cm2 and thickness 0.5 mm. If the concentration of electrons in Ge is 2 × 1019/m3 and mobilities of electrons and holes are 0.36   and 0.14   respectively, then the current flowing through the plate will be

(a) 0.25 A

(b) 0.45 A

(c) 0.56 A 

(d) 0.64 A
→
Alternating current cannot be measured by de ammeter because:
→
Binding energy per nucleon for C12 is 7.68 MeV and for C13 is 7.74MeV. The energy required to remove a neutron from C13 is:
→

A plane convex lens is made of refractive index 1.6. The radius of curvature of the curved surface is 60 cm. The focal length of the lens is

(a) 50 cm

(b) 100 cm

(c) 200 cm

(d) 400 cm
→

Four capacitors of each of capacity 3μF are connected as shown in the adjoining figure. The ratio of equivalent capacitance between A  and B  and between A  and C  will be

(a) 4 : 3

(b) 3 : 4

(c) 2 : 3

(d) 3 : 2
→
When the light source is moving away, the Doppler effect for light is known as:
→
The radius of the nucleus is smaller than the radius of the atom, approximately :
→

Assertion :   A compass needle when placed on the magnetic north pole of the earth rotates in vertical direction.

Reason     : The earth has only horizontal component of its magnetic field at the north poles.

(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 the assertion and reason both are false.

→

The V-i graph for a conductor makes an angle θ with V-axis. Here V denotes the voltage and i denotes current. The resistance of conductor is given by

(a) sin θ

(b) cos θ

(c) tan θ 

(d) cot θ
→