MCQ – Basic Electrical
1. The
ratio of voltage and electric current in a closed circuit
§ remains constant
§ varies
§ increases
§ falls
2. The
curve representing ohm’s law is
§ sine function
§ Linear
§ A parabola
§ a hyperbola
3. The
resistance of a conductor having length l area of cross section a and
resistivity ρ is given as:
§ ρa/l
§ ρl/a
§ ρla
§ l/ρa
4. The
resistance of wire varies inversely as
§ area of cross
section
§ length
§ resistivity
§ temperature
5.
Which of the following quantities are same in all parts of a series circuit?
§ voltage
§ power
§ current
§ resistance
6.Which
of the following statements is false in case of a series circuit?
§ the voltage drop across
each resister is same
§ the current flowing
through each resistor is the same
§ applied voltage is equal
to the sum of voltage drops across individual resistors
§ resistors are additive
7. A
resistance of 30 Ω is connected across 240v supply. If a resistance R Ω is
connected in parallel with 30Ω resistor across the same supply, the
current drawn becomes triple of original one. The unknown resistor R is
§ 15Ω
§ 10Ω
§ 5Ω
§ 30Ω
8.
Three resistors, each of R ohms, are connected to form a triangle. The
resistance between any two terminals will be:
§ 2/3 R
§ 3/2R
§ R
§ 3R
9.
Which of the following is not correct?
§ P=V/R^2
§ P=VI
§ I=√(P/R)
§ V=√PR
10. A
100W bulb is connected in series with a room heater. If now 100W bulb is
replaced by a 40w bulb, the heater output will :
§ increase
§ decrease
§ Remain the same
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