Electricity One Mark Online Test

Electricity One Mark Online Test (10th Standard Science)

Pick how many questions you want and set a time limit, then start. You'll get your score at the end with the correct answer and an explanation for every question. Free, in Tamil and English — 19 questions available.

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Which of the following is correct?

A.Rate of change of charge is electrical power. B.Rate of change of charge is current. C.Rate of change of energy is current. D.Rate of change of current is charge.

SI unit of resistance is

A.mho B.joule C.ohm D.ohm meter

In a simple circuit, why does the bulb glow when you close the switch?

A.The switch produces electricity. B.Closing the switch completes the circuit. C.Closing the switch breaks the circuit. D.The bulb is getting charged.

Kilowatt hour is the unit of

A.resistivity B.conductivity C.electrical energy D.electrical power

If a current of 0.75 A flows through a conductor for 10 minutes, what is the total charge that passes through any cross-section of the conductor?

A.7.5 C B.450 C C.75 C D.0.075 C

In an active electric circuit, what is the relationship between the conventional direction of electric current and the actual direction of electron flow?

A.Conventional current flows in the same direction as the electron flow. B.Conventional current flows in the direction opposite to the electron flow. C.Conventional current is perpendicular to the electron flow. D.There is no relationship between their directions.

How much work is done in moving a charge of 4 C across two points in a circuit having a potential difference of 12 V?

A.3 J B.0.33 J C.48 J D.16 J

According to Ohm's law, the steady current flowing through a conductor is directly proportional to the potential difference across its ends under which of the following physical conditions?

A.When temperature varies continuously B.At constant temperature C.When temperature is kept at zero degrees Celsius D.Independent of temperature changes

Which of the following statements is true regarding electrical resistivity of materials at constant temperature?

A.It is higher for copper than for glass. B.It is a constant for a given material and its SI unit is ohm metre. C.It increases as the length of the wire increases. D.Its SI unit is ohm per metre.

Q10

Three resistors of resistances 5 \(\Omega\), 15 \(\Omega\), and 20 \(\Omega\) are connected end-to-end in a series combination. What is the effective resistance of this system?

A.Less than 5 \(\Omega\) B.Exactly 15 \(\Omega\) C.40 \(\Omega\) D.3.75 \(\Omega\)

Q11

When resistors are connected in a parallel combination across a potential source, which electrical quantity remains the same across each resistor?

A.Electric current B.Potential difference C.Electrical power D.Both current and potential difference

Q12

If the effective resistance of three identical resistors in series is S and their effective resistance in parallel is P, what is the ratio of S to P?

A.3 B.1/9 C.9 D.1/3

Q13

Why is an alloy of nickel and chromium (Nichrome) commonly used as the heating element in electrical appliances like electric irons and heaters?

A.It has low resistivity and low melting point. B.It has high resistivity and is not easily oxidized at high temperatures. C.It is a superconductor at room temperature. D.It is extremely cheap and melts easily.

Q14

Which of the following correctly describes the properties required for a fuse wire and a bulb filament respectively?

A.Fuse wire: high melting point; Filament: low melting point B.Fuse wire: high resistance and high melting point; Filament: low resistance and low melting point C.Fuse wire: low melting point; Filament: high melting point D.Both must have identical melting points and resistances

Q15

An electric motor has a power rating of 2.5 horsepower (hp). What is its equivalent power rating in watts?

A.1865 W B.746 W C.1492 W D.2500 W

Q16

How many Joules of energy are equivalent to 1 kilowatt hour (kWh) of electrical energy consumed?

A.\(3.6 x 10^3 J\) B.\(3.6 x 10^5 J\) C.\(3.6 x 10^6 J\) D.\(1.0 x 10^3 J\)

Q17

In domestic electric circuits in India, what is the color of the insulation for the live wire and what is the potential of the alternating current supplied?

A.Red insulation and 220 V potential B.Black insulation and 110 V potential C.Green insulation and 220 V potential D.Red insulation and 110 V potential

Q18

What is the primary role of the earth wire, which has green insulation, in domestic electrical circuits?

A.To carry current to run low-power appliances like fans. B.To serve as a protective conductor that safe-guards users from electric shocks. C.To regulate the frequency of the alternating current. D.To increase the effective resistance of the circuit during overloading.

Q19

Which of the following conditions occurs when a live wire comes directly in contact with a neutral wire, leading to a very small effective resistance and a large flow of current?

A.Overloading B.Earthing C.Short circuiting D.Electromagnetic induction

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About this Electricity test

This free online practice test covers Electricity from the 10th Standard Science (Samacheer Kalvi) syllabus. Choose the number of questions and an optional time limit, then answer and submit — everything is checked in your browser, with the correct answers and a worked explanation shown at the end. For the full solutions to every question in this set, see the solved MCQs page.

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