Electricity: MCQ Test (25 questions)

Question 1 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 2 of 25

Which one of the following non-metals is not a poor conductor of electricity?

ASulphur
BSelenium
Cbromine
DPhosphorus

Question 3 of 25

Which of the following is not a semiconductor?

AGermanium
BSilicon
CSelenium
DArsenic

Question 4 of 25

What is the resistance of an ideal voltmeter?

AZero
BLower
CUnlimited
DHigh

Question 5 of 25

Electricity resides in mercury lamp-

Amercury at low pressure
Bmercury at high pressure
CNeon and mercury
Dnone of these

Question 6 of 25

Faraday's constant-

Adepends on the amount of electrolyte
Bdepends on the electric current passed through the electrolyte
CDepends on the volume of the solvent in which the electrolyte is dissolved.
Dis a universal constant (e) None of the above More than one of the above

Question 7 of 25

The length of a wire is L meters, the wire is stretched to 21 meters; now the resistance of the wire will be-

Adouble the previous
Bfour times the previous
Ca quarter of the first
Dwill remain unchanged

Question 8 of 25

The instrument used to detect the presence of electric current in a circuit is-

Arefractometer
Bgalvanometer
Cviscometer
Ddiffractometer

Question 9 of 25

The cost of energy to operate an industrial refrigerator that uses 5 kW of power when it operates for 10 hours a day for 30 days is [given that the charge per kWh of energy is ₹4]

A₹ 600
B₹ 6,000
C₹ 1,200
D₹ 1,500

Question 10 of 25

Which instrument measures electrical resistance?

AAmmeter
Bpotentiometer
Cvoltameter
Dohm meter

Question 11 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 12 of 25

Which of the following is the unit of electric current?

AKelvin
Bmole
Ccandela
DAmpere

Question 13 of 25

When a short circuit condition occurs, the current in the circuit-

Abecomes zero
Bremains stable
Cgrows sufficiently
Dchanges randomly

Question 14 of 25

"The potential difference across the ends of a conductor is directly proportional to the current flowing through it." This law is-

ACoulomb's law
BFaraday's law
CJoule's law
DOhm's law

Question 15 of 25

The household appliance based on the heating effect of electric current is-

Aelectric heater
Belectric bulb
Ctube light
DAll of the above

Question 16 of 25

The filament of an electric bulb is made of which element?

ACopper
BIron
Clead
Dtungsten

Question 17 of 25

How much is 1 volt equal to?

A1 joule
B1 joule/coulomb
C1 newton coulomb
D1 joule/newton

Question 18 of 25

The electrical resistance of a conductor is independent of

Atemperature
Bpressure
Ccross-sectional area
Dlength

Question 19 of 25

The unit of resistance is-

AAmpere
BCoulomb
CHenry
DOm

Question 20 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 21 of 25

Metals are good conductors of electricity because-

Athey contain free electrons
Btheir atoms are lighter
Ctheir melting point is high
DAll of the above

Question 22 of 25

Which of the following are used as electrolytes in a dry match (battery)?

AAmmonium chloride and zinc chloride
Bsodium chloride and calcium chloride
CMagnesium Chloride and Zinc Chloride
DAmmonium chloride and calcium chloride

Question 23 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 24 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 25 of 25

Those substances which do not have free electrons in normal state, but free electrons can be obtained under special conditions like high temperature or by adding impurities, are called-

Agood conductor material
Binsulator material
Cdielectric material
Dsemiconductor material