Monohar Pandey Solutions for Exercise 6: Exercise 6

Consider the following statements

1. Au, Ag, Cu, Zn, Sb, Bi, H₂O and air are examples of diamagnetic

2. Na, AI, Mn, CaCl₂ and oxygen are examples of paramagnetic.

3. Fe, Co, Ni and Fe₃O₄ are examples of ferromagnetic.

Which of the statement(s) given above is/are correct?

The Current (I) Voltage (V) plot of a certain electronic device is given above.The device is:

The electric current passing through a metallic wire produces heat because of

Two charges of 40 $\mu$C and -20 $\mu$C are kept some distance apart. Now, they are touched and kept at the same distance apart. The ratio of the initial and the final forces between them is

Consider the following statements

1. A thermoelectric refrigerator works on Peltier effect.

2. The electrolyte in the dry cell is ammonium chloride.

3. The electrolyte in a car battery is sulphuric acid.

4. When a metal is heated, its resistance increases.

Which of the statements given above are correct?

Consider the following statements

1. Constantan wire is used in making standard resistance because its temperature co-efficient of resistance is negligible.

2. Thermocouple thermometer is based on Peltier effect.

3. Potentiometer measures potential more accurately because it measures potential in the open circuit.

4. In an electrolysis, the amount of mass deposited or liberated at an electrode is directly proportional to amount of charge.

Which of the statements given above are correct?

Which of the adjoining graph represent ohmic resistance?

Consider the following statements

1. In a charged capacitor, the energy is stored in the electric field between the plates.

2. The dielectric constant of metals is infinite.

3. The field intensity on the surface of a charged conductor is directed normally to the surface.

4. Kirchhoff's voltage law is based on the law of conservation of energy.

Which of the statements given above are correct?