Electrical basics MCQ Objective Questions

1. The flow of electric current in a conductor is due to the flow of:
a) Electrons
b) Protons
c) Electrons and ions
d) Charged particles

A

2. The minimum requirement for causing flow of current are:
a) A voltage source, a resistor and a switch
b) A voltage source and a conductor
c) A power source an bulb
d) A voltage source, a conductor, an ammeter and switch

B

3. Current velocity through the copper conductor is:
a) Nearly 3X10⁹m/sec
b) Of the order of few micro m/s
c) Independent of the current strength
d) The same as propagation   velocity of electrical energy

A

4. Which of the following current is considered dangerous to the human body:
a) 1 mA
b) 25 mA
c) 50 mA
d) 0.5 mA

C

5. Ampere-second is the unit of:
a) emf
b) Charge
c) Power
d) Energy

B

6. Resistance of human body is about:
a) 10 ohms
b) 100 ohms
c) 1000 ohms
d) 10,000 ohms

C

7. The resistance of the wire varies inversely as:
a) Area of cross section
b) Length
c) Resistivity
d) Temperature

A

8. Voltage is a form of:
a) Potential energy
b) Kinetic energy
c) Can be both Potential and Kinetic energy
d) None of the above

A

9. The ratio of voltage and electrical current in a closed circuit:
a) Remains constant
b) Varies
c) Increases
d) Falls

A

10. The curve representing Ohms law is a:
a) Sine function
b) Linear
c) Parabola
d) Hyperbola

B