MCQ
In the valance band, the current is due to :
- AThe presence of electrons
- ✓The presence of holes
- CThe presence of both electrons and holes
- DNone of the above
✓
Answer
Correct option: B.
The presence of holes
In the valence band, current is only due to holes. In the conduction band, current is due to electrons.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
More "M.C.Q (1 Marks)" from Semiconductor Electronic: Material, Devices And Simple Circuits→Semiconductor Electronic: Material, Devices And Simple Circuits — all question types→Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→
Similar questions
All six capacitors shown are identical, Each can withstand maximum 200 volts between its terminals. The maximum voltage that can be safely applied between A and B is
A current carrying rectangular loop PQRS is made of uniform wire. The length $PR = QS =5\,cm$ and $PQ = RS =100\,cm$. If ammeter current reading changes from I to $2 I$, the ratio of magnetic forces per unit length on the wire $P Q$ due to wire RS in the two cases respectively $f_{ PQ }^{ I }: f_{ PQ }^{2 I }$ is :
→Angle of a prism is $30^{\circ}$ and its refractive index is $\sqrt{2}$ and one of the surface is silvered. At what angle of incidence, a ray should be incident on one surface so that after reflection from the silvered surface, it retraces its path
→An aeroplane, with its wings spread $10\, m ,$ is flying at a speed of $180 \,km / h$ in a horizontal direction. The total intensity of earth's field at that part is $2.5 \times 10^{-4}\, Wb / m ^{2}$ and the angle of dip is $60^{\circ}$. The emf induced between the tips of the plane wings will be ...... $mV$
→X-rays are not used for radar purpose because
A cylindrical conductor has uniform cross-section. Resistivity of its material increase linearly from left end to right end. If a constant current is flowing through it and at a section distance x from left end, magnitude of electric field intensity is E, which of the following graphs is correct
Which logic gate produces $\text{LOW}$ output when any of the inputs is $\text{HIGH}$?
→A thin uniform rod with negligible mass and length $l$ is attached to the floor by a frictionless hinge at point $P$ . A horizontal spring with force constant $k$ connects the other end to wall. The rod is in a uniform magnetic field $B$ directed into the plane of paper. What is extension in spring in equilibrium when a current $i$ is passed through the rod in direction shown. Assuming spring to be in natural length initially.
→In $X-$ ray experiment $K_{\alpha}$, $K_{\beta}$ denotes
→The self inductance of a straight conductor is