MCQ
Conductivity of semiconductors due to increase in temperature :
  • A
    remains unchanged
  • decreases
  • C
    increases
  • D
    first decreases and then increases

Answer

Correct option: B.
decreases
(b) - decreases

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 plane mirror produces an image that is:

The speed of light depends:
  1. On elasticity of the medium only.
  2. On inertia of the medium only.
  3. On elasticity as well as inertia.
  4. Neither on elasticity nor on inertia.

When ultraviolet rays are incident on metal plate, then photoelectric effect does not occurs. It occurs by the incidence of

(a) X-rays  

(b) Radio wave

(c) Infrared rays

(d) Green house effect

Distance between two slits $S_1$ and $S_2$ in Young's double slit experiment is 1 mm . What should be the width of each slit so that the $10^{\text {th }}$ maximum of the double slit is obtained at the central maximum of the slit?

A combination of two thin lenses of the same material with focal lengths  and , arranged on a common axis minimizes chromatic aberration, if the distance between them is

(a)  

(b)

(c) ( 

(d)  

The essential distinction between X-rays and  γ - rays is that

(a) γ-  rays have smaller wavelength than X-rays

(b) γ - rays emanate from nucleus while X-rays emanate from outer part of the atom

(c) γ- rays have greater ionizing power than X-rays

(d) γ- rays are more penetrating than X-rays

An electron is accelerated through a p.d. of 45.5 volt. The velocity acquired by it is (in ms-1)

(a) 4  

(b) 4  

(c)     

(d) Zero

Unit of magnetic permeability is

(a) Amp/metre

(b) Amp/ 

(c) Henry

(d) Henry/metre

Two capacitors of capacitances 3 μF  and 6 μF  are charged to a potential of 12 V each. They are now connected to each other, with the positive plate of each joined to the negative plate of the other. The potential difference across each will be

(a) 6 volt

(b) 4 volt

(c) 3 volt 

(d) Zero

Which of the following are best suited to make the core of a transformer?