Chapter 13 - Current and Electricity - 3

Chapter 13 - Current and Electricity - 3

1. 1 Ampere =

a) 1 C/S
b) 1 S/C
c) 1 C/S²
d) 1 C/S^-1

2. The current through a metallic conductor is due to the motion of:

a) Positron
b) Free electrons
c) Neutrons
d) Protons

3. The device which converts heat into electrical energy is:

a) cell
b) Thermo-couples
c) Solar cell
d) Battery

4. The unit of Resistance is:

a) Coulomb
b) Ohm
c) Volt
d) Ampere

5. The unit of resistivity is :

a) Volt
b) Ohm-meter
c) Ohm
d) Kilo-Ohm

6. According to colour code the numerical value of blue colour is:

a) 8
b) 9
c) 7
d) 6

7. The equation for calculating the power dissipated in a resistor is:

a) P=IV
b) P=I²R
c) P= V²R
d) All of these.

8. The resistance of a wire increases with increase in:

a) Surface area
b) Both surface area and diameter
c) Length
d) Diameter

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