Question
In the valance band, the current is due to:
✓
Answer
- 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→Rajasthan Board STD 12 Science question papers→Rajasthan Board question paper generator→
Similar questions
Consider the situation of the previous problem. The force on the central charge due to the shell is:
- Towards left.
- Towards right.
- Upward.
- Zero.
Electrical energy is transmitted over large distances at high alternating voltages. Which of the following statements is $($are$)$ correct?
→A 4 μF condenser is connected in parallel to another condenser of 8 μF. Both the condensers are then connected in series with a 12 μF condenser and charged to 20 volts. The charge on the plate of 4 μF condenser is(a) 3.3 μC(b) 40 μC(c) 80 μC(d) 240 μC
Two source $S_1$ and $S_2$ of intensity $I_1$ and $I_2$ are placed in front of a screen $[$Fig. (a)$]$. The patteren of intensity distribution seen in the central portion is given by Fig. $(b)$.
In this case which of the following statements are true.
→In this case which of the following statements are true.
An ammeter, suspected to give inaccurate reading, is connected in series with a silver voltameter. The ammeter indicates $0.54 A .$ A steady current passed for one hour deposits $2.0124 \ gm$ of silver. If the $\text{E.C.E.}$ of silver is $1.118 \times 10^{-3} \mathrm{gmC}^{-1},$ then the error in ammeter reading is
→Which of the following sets cannot enter into the list of fundamental quantities in any system of units?
- Length, mass and velocity.
- Length, time and velocity.
- Mass, time and velocity.
- Length, time and mass.
A boy stands straight infront of a mirror at a distance of $30 \ cm$ away from it. He sees his erect image whose height is $\frac{1}{5} {th}$ of his real height. The mirror he is using is
→'Mirage' is a phenomenon due to(a) Reflection of light(b) Refraction of light(c) Total internal reflection of light(d) Diffraction of light
Two rails of a railway track insulated from each other and the ground are connected to a milli voltmeter. What is the reading of voltmeter, when a train travels with a speed of $180 \ km/hr$ along the track. Given that the vertical component of earth's magnetic field is $0.2 \times 10^{-4}$ weber $/ m ^2$ and the rails are separated by $1$ metre
→The focal length of a concave mirror is 10 cm. On placing an object at 10 cm in front of the mirror, its image will be formed: