Question

The production of e.m.f. by maintaining a difference of temperature between the two junctions of two different metals is known as

(a) Joule effect

(b) Seebeck effect

(c) Peltier effect

(d) Thomson effect

Answer

(b) Seebeck effect

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 current passes through a resistor. Let K1 and K2 represent the average kinetic energy of the conduction electrons and the metal ions, respectively:
The speed at which the current travels in a conductor, is nearly.
Displacement current is.

The condition for a uniform spherical mass m of radius r to be a black hole is [G = gravitational constant and g = acceleration due to gravity]

(a)  

(b)

(c)

(d)

The rms speed of oxygen molecules in a gas is v. If the temperature is doubled and the oxygen molecules dissociate into oxygen atoms, the rms speed will become:
  1. $\text{v}$
  2. $\text{v}\sqrt{2}$
  3. $2\text{v}$
  4. $4\text{v}$

The chemical equivalent of copper and zinc are 32 and 108 respectively. When copper and silver voltameter are connected in series and electric current is passed through for sometimes, 1.6 g of copper is deposited. Then, the mass of silver deposited will be

(a) 3.5 g  

(b) 2.8 g

(c) 5.4 g  

(d) None of these

Photocell is based on :
Water is flowing through a long horizontal tube. Let PA and PB be the pressures at two points A and B of the tube.
  1. PA must be equal to PB.
  2. PA must be greater than PB.
  3. PA must be smaller than PB.
  4. PA = PB only if the cross- sectional area at A and B are equal.

Amplification factor of a triode is 10. When the plate potential is 200 volt and grid potential is – 4 volt, then the plate current of 4mA is observed. If plate potential is changed to 160 volt and grid potential is kept at – 7 volt, then the plate current will be

(a) 1.69 mA

(b) 3.95 mA

(c) 2.87 mA

(d) 7.02 mA

Magnetic effect of current was discovered by

(a) Faraday

(b) Oersted

(c) Ampere

(d) Bohr