MCQ
Which of the following statements is false?
  • A
    The resistance of which semiconductor decreases with increase in temperature?
  • B
    The displacement of the hole in the electric field is in the opposite direction to the displacement of the electron.
  • The resistance of a conductor decreases as temperature increases.
  • D
    All types of semiconductors are uncharged.

Answer

Correct option: C.
The resistance of a conductor decreases as temperature increases.
(c) - The resistance of a conductor decreases as temperature increases.

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

When light travels from glass to air, the incident angle is  and the refracted angle is . The true relation is

(a)  

(b)  

(c)  

(d) Not predictable

The equation $\text{y}=\text{A}\sin^2(\text{kx}-\omega\text{t})$ represents a wave motion with:
  1. Amplitude A, frequency $\frac{\omega}{2\pi}$
  2. Amplitude $\frac{\text{A}}{2},$ frequency $\frac{\omega}{\pi}$
  3. Amplitude 2A, frequency $\frac{\omega}{4\pi}$
  4. Does not represent a wave motion.

A spherical conductor of radius 2m is charged to a potential of 120 V. It is now placed inside another hollow spherical conductor of radius 6m. Calculate the potential to which the bigger sphere would be raised

(a) 20 V

(b) 60 V

(c) 80 V

(d) 40 V

In the arrangement shown in figure, the ends P and Q of an inextensible string move downwards with uniform speed u. Pulleys A and B are fixed. The mass M moves upwards with a speed:

  1. $2\text{u}\cos\theta$

  2. $\frac{\text{u}}{\cos\theta}$

  3. $\frac{\text{2u}}{\cos\theta}$

  4. $\text{u}\cos\theta$

Figure, shows some of the electric field lines corresponding to an electric field. The figure suggests that,

  1. EA > E8 > Ee
  2. EA = EB = Ee
  3. EA = Ec > EB
  4. EA = Ec < EB.

The angle of minimum deviation measured with a prism is 30° and the angle of prism is 60°. The refractive index of prism material is

(a)

(b) 2

(c) 3/2     

(d) 4/3

In comparing e.m.f.s of 2 cells with the help of potentiometer, at the balance point, the current flowing through the wire is taken from:
The current in a coil of 0.4mH coil increases by 250mA in 0.1 seconds. The induced emf will be:-
A capacitor is a system of two conductors separated by _____.

The two ends of a uniform conductor are joined to a cell of e.m.f. E and some internal resistance. Starting from the midpoint P of the conductor, we move in the direction of current and return to P. The potential V at every point on the path is plotted against the distance covered (x). Which of the following graphs best represents the resulting curve

(a)

(b)

(c)

(d)