BASIC ELECTRICAL PRACTICE - Practice Mode

1) Which law states that in closed electric circuit, the applied voltage is equal to the sum of the voltage drops?

Ohm's law Laws of resistance Kirchhoff's first law Kirchhoff's second law

Correct Answer: Kirchhoff's second law

Explanation:

Kirchhoff's Voltage Law or Kirchhoff's Second Law states that “in any closed loop network, the total voltage around the loop is equal to the sum of all the voltage drops within the same loop” which is also equal to zero.

2) Calculate the total power of the circuit of two lamps rated as 200W/240V are connected in series across 240V supply?

50 W 100 W 200 W 400 W

Correct Answer: 100 W

3) What is the change of resistance value of the conductor as its diameter is doubled?

Increases to two times Decreases to four times Decrease to half of the value No change in value of resistance

Correct Answer: Decreases to four times

4) Which material is having negative temperature co-efficient property?

Mica Eureka Copper Manganin

Correct Answer: Mica

Explanation:

Mica is the example for negative temperature coefficient substance. Mica has negative temperature coefficient of resistance. So, resistance will decrease with increase in temperature.

5) What electrical quantities are related in Ohm's law?

Current, resistance and power Current, voltage and resistivity Current, voltage and resistance Voltage, resistance and current density

Correct Answer: Current, voltage and resistance

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