13 Questions

Questions and Answers

- 1.Joule’s law of heating is (1) (2) (3) (4)
- A.
(3)

- B.
(1)

- C.
(2)

- D.
(4)

- 2.Nichrome wire is used as the heating element because it has
- A.
High specific resistance

- B.
Low melting point

- C.
Low specific resistance

- D.
High conductivity

- 3.Peltier coefficient at a junction of a thermocouple depends on
- A.
The temperature of the junction

- B.
The charge that passes through the thermocouple

- C.
The time for which current flows

- D.
The current in the thermocouple

- 4.In a thermocouple, the temperature of the cold junction is , the neutral temperature is . The temperature of inversion is
- A.
(1)

- B.
(2)

- C.
(3)

- D.
(4)

- 5.Which of the following equations represents Biot-savart law? (1) (2) (3) (4)
- A.
(4)

- B.
(3)

- C.
(1)

- D.
(2)

- 6.
- A.
(4)

- B.
(2)

- C.
(3)

- D.
(1)

- 7.In a tangent galvanometer, for a constant current, the deflection is . The plane of the coil is rotated through . Now, for the same current, the deflection will be
- A.
(4)

- B.
(2)

- C.
(1)

- D.
(3)

- 8.The period of revolution of a charged particle inside a cyclotron does not depend on
- A.
The velocity of the particle

- B.
The magnetic induction

- C.
The charge of the particle

- D.
The mass of the particle

- 9.The torque on a rectangular coil placed in a uniform magnetic field is large, when
- A.
the number of turns is large

- B.
The number of turns is less

- C.
The plane of the coil is perpendicular to the field

- D.
The area of the coil is small

- 10.Phosphor – bronze wire is used for suspension in a moving coil galvanometer, because it has
- A.
Small couple per unit twist

- B.
High conductivity

- C.
Large couple per unit twist

- D.
High resistivity

- 11.Of the following devices, which has small resistance?
- A.
Ammeter of range 0–10 A

- B.
Ammeter of range 0 – 1A

- C.
Voltmeter

- D.
Moving coil galvanometer

- 12.
- A.
Ra is less than both G and S

- B.
S is less than Ra but greater than G.

- C.
S is less than both G and Ra

- D.
G is less than S

- 13.An ideal voltmeter has
- A.
infinite resistance

- B.
Zero resistance

- C.
Finite resistance less than G but greater than Zero

- D.
Resistance greater than G but less than infinity