Electricity: MCQ Test (25 questions)

Question 1 of 25

An electrical fuse wire must have which of the following property sets for general applications?

AThick wire, high melting point alloy, short length
BThick wire, low melting point alloy, greater length
CShort elongation, low melting point alloy, thin wire
DLonger length, lower melting point alloy, thinner wire

Question 2 of 25

A fuse wire is identified by which of these characteristics?

ALowest resistivity and high melting point
BHigh resistivity and high melting point
Chigh resistivity and low melting point
DLowest resistivity and lowest melting point

Question 3 of 25

By what is alternating current converted into direct current?

AFilter
BRectifier
CMotor
DTransformers

Question 4 of 25

The device that converts alternating current into direct current is called-

AInverters
BRectifier
Ctransformer
Dtransmitter

Question 5 of 25

The filament of an electric bulb glows when current flows through it, but the wires carrying current to the filament do not glow. This is because:

AMore current flows through the filament than through the wire
BThe resistance of the filament is less than that of the wire
CThe resistance of the filament is higher than that of the wire
DOnly tungsten metal glows when electric current is passed through it.

Question 6 of 25

When an ebonite rod is rubbed against the skin of a cat, the ebonite rod-

Abecomes negatively charged
BIt becomes positively charged.
Cremains indifferent
Dfirst negatively charged then positively charged

Question 7 of 25

What is the coating of zinc on iron called?

Agalvanization
Belectroplating
CIonization
DNone of these

Question 8 of 25

"If there is no change in the physical state of a conductor, such as temperature, then the potential difference applied across the conductor is directly proportional to the current flowing through it." This law is---

ACoulomb's law
BOhm's law
CFaraday's law
DKirchhoff's law

Question 9 of 25

Transformers are used in-

ATo convert AC to DC
BTo convert DC to AC
CTo oxidize DC voltage
DTo oxidize or reduce AC voltage

Question 10 of 25

Electric current does not flow between two connected charged objects if they are-

Aon the same charge
Bat the same capacity
Cat the same resistance
Dat the same potential

Question 11 of 25

The force between two electric charges is related to-

AAmpere's law
BCoulomb's law:
CFaraday's law
DOhm's law

Question 12 of 25

If a resistive wire is made longer, then its resistance-

Aincreases
Bdecreases
Cremains constant
DAll of these

Question 13 of 25

A conductor has a resistance of 440 ohms. How much current will flow through it if it is connected to a 110 volt source?

A0.5A
B0.25A
C4A
D1.25A

Question 14 of 25

The device for converting electrical energy into mechanical energy is-

ADynamo
Btransformer
Celectric motor
DInductor

Question 15 of 25

The SI unit of specific resistance is-

AOm
Bohm-meter
Cohm/meter
Dohm/meter2

Question 16 of 25

100 W electric bulb is used for 10 hours a day. How many units of energy will be used in 30 days?

A1
B10
C30
D300

Question 17 of 25

It is measured by the work done in moving a unit positive charge from one point to another in an electric circuit, the distance between those points-

Ato resistance
Bto the potential difference
Cto the stream
Dthe strength of the electric current

Question 18 of 25

The algebraic sum of the currents meeting at a point in a circuit is-

Ainfinite
BZero
Cbetween zero and infinity
Dnone of the above

Question 19 of 25

In a three pin electrical plume the longest pin should be connected to-

Afrom the base end
BSanjeev from the beginning
Cfrom an indifferent head
Dfrom any end

Question 20 of 25

The value of one kilowatt hour (kWh) is-

A36×10 6J
B3.6×103J
C100 J
D10 J

Question 21 of 25

The safety fuse wire used in domestic electrical appliances is made of the metal whose-

Aresistance is low
Bhave a lower melting point
Cthe specific density is low
Dconductivity is low

Question 22 of 25

What is the source of electrical energy in an artificial satellite?

AThermopile
BSolar Cell
Csmall nuclear reactor
DDynamo

Question 23 of 25

The electrolyte used in a car battery is—

Ahydrochloric acid
Bsulfuric acid
Cnitric acid
Ddistilled water

Question 24 of 25

If a 100 watt electric bulb burns for 10 hours, then the electricity cost at the rate of ₹5 per unit will be-

A₹ 5
B₹ 10
C₹ 25
D₹ 50

Question 25 of 25

The electricity consumption bill is based on the measurement of 1. Wattage 2. Voltage 3. Ohm 4. Ampere Choose the correct answer from the codes given below:

Aonly 1
B1 and 2
C2 and 3
D1 and 4