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

The electric potential at a point on the axis of an electric dipole depends on the distance r of the point from the dipole as

(a)  

(b)

(c) ∝ r

(d)

The unit of magnetic flux is

(a)  

(b) Weber

(c) Henry  

(d) Ampere/m

The Boolean expression for NOR gate, is :
At the surface of a charged conductor electrostatic field must be _____ to the surface at every point.

The direction of current in an iron-copper thermocouple is

(a) From copper to iron at the hot junction

(b) From iron to copper at the hot junction

(c) From copper to iron at cold junction

(d) No current will flow

In the grid circuit of a triode a signal E = 2  is applied. If m = 14 and rp =10 kW then root mean square current flowing through   will be

(a) 1.27 mA

(b) 10 mA

(c) 1.5 mA

(d) 12.4 mA

A situation may be described by using different sets of coordinate axes having different orientations. Which of the following do not depend on the orientation of the axes?
  1. The value of a scalar.
  2. Component of a vector.
  3. A vector.
  4. The magnitude of a vector.
A parallel-plate capacitor has plates of unequal area. The larger plate is connected to the positive terminal of the battery and the smaller plate to its negative terminal. Let Q+ and Q- be the charges appearing on the positive and negative plates respectively:
  1. Q+ > Q-
  2. Q= Q-
  3. Q+ < Q-
  4. The information is not sufficient to decide the relation between Q+ and Q-.

In Young's double slit experiment, the distance between sources is 1 mm and distance between the screen and source is 1 m. If the fringe width on the screen is 0.06 cm, then λ =    

(a) 6000 Å

(b) 4000 Å

(c) 1200 Å

(d) 2400 Å

If an object is positively charged, theoretically the mass of the object ______?