Chapter 13 - Current and Electricity - 4

Chapter 13 - Current and Electricity - 4

1. The unit of temperature co-efficient is:

a) Volt
b) Ohm
c) C^-1
d) Ampere

2. Internal resistance is the resistance offered by:

a) The conductor
b) The circuit
c) The resistor
d) Source of EMF

3. The algebic sum of potential changes for a closed loop is zero:

a) Joule’s Law
b) Fleming’s rule
c) Kirchhoff’s first rule
d) Kirchhoff’s 2nd rule

4. If a source of EMF is traversed from negative to positive terminal the potential change is:

a) Negative
b) Positive and Negative Both
c) Positive
d) No change

5. Measure of the opposition to the flow of free electrons is known as:

a) Capacitance
b) Current
c) Resistance
d) Conductance

6. Resistance ‘R’ of a wire of length “L” is given by the relation:

a) R=ρL/A
b) R=L/A
c) R=L/ρA
d) R=ρL/A

7. An ideal voltmeter would have an:

a) Infinite resistance
b) Resistance equal to the circuit
c) Double the resistance of circuit
d) Very law resistance

8. The process of coating a thin layer of some expensive metal on an article of some cheap metal is:

a) Electroplating
b) Ionization
c) Electrolysis
d) Conduction

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