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NEET JEE QUIZ Current Electricity – Theory based 100 MCQs Tests sep 4

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Current Electricity — 10 Theory MCQ Tests

Current Electricity

10 Theory-Based MCQ Tests × 10 Questions

Test 1 — Current & Drift

1. The rate of flow of electric charge through any cross-section of a conductor is called:

Correct answer: Electric current

2. What is the SI unit of electric current?

Correct answer: Ampere

3. The driving force in a working electrical circuit is:

Correct answer: Voltage difference

4. Drift velocity of electrons is caused by:

Correct answer: An applied electric field

5. In the absence of an electric field, the mean velocity of free electrons in a conductor is:

Correct answer: Zero

6. Which electron characteristic determines current in a conductor?

Correct answer: Drift velocity

7. The direction of conventional current is taken from:

Correct answer: Higher potential to lower potential

8. Why does an electric bulb glow almost immediately after a switch is closed?

Correct answer: An electric field is established throughout the circuit rapidly

9. In a steady current flowing through a conductor of non-uniform cross-section, which quantity remains constant?

Correct answer: Current

10. Current density is defined as:

Correct answer: Current per unit cross-sectional area

Test 2 — Resistance & Resistivity

1. Resistance of a uniform conductor is given by:

Correct answer: ρL/A

2. Resistivity is an intrinsic property that primarily depends on:

Correct answer: Material

3. If the length and radius of a wire are both doubled, its resistance becomes:

Correct answer: Half

4. The specific resistance (resistivity) of a wire is independent of:

Correct answer: Dimensions of the conductor

5. The reciprocal of resistance is called:

Correct answer: Conductance

6. The SI unit of conductance is:

Correct answer: Siemens

7. For metals, resistivity generally:

Correct answer: Increases with temperature

8. For semiconductors, resistivity generally:

Correct answer: Decreases with temperature

9. Which material has relatively weak temperature dependence of resistivity?

Correct answer: Nichrome

10. Constantan is suitable for standard resistance mainly because it has:

Correct answer: A negligible temperature coefficient of resistance

Test 3 — Ohm’s Law & Conductors

1. Ohm's law states that, at constant physical conditions:

Correct answer: V is proportional to I

2. For an ohmic conductor, the V-I graph is:

Correct answer: A straight line through the origin

3. Which is a non-ohmic device?

Correct answer: Diode

4. A metallic conductor may deviate from Ohm's law at high current because:

Correct answer: Its temperature rises and resistance changes

5. A carbon resistor is generally identified by:

Correct answer: Colour bands

6. Resistor colour coding is mainly used to determine its:

Correct answer: Resistance value

7. The third band in a common carbon-resistor colour code indicates:

Correct answer: Multiplier

8. The tolerance band in a resistor indicates:

Correct answer: Possible variation from the indicated resistance

9. The product of resistivity and conductivity is:

Correct answer: One

10. The relation between electric field E, current density J and resistivity ρ is:

Correct answer: E = Jρ

Test 4 — Cells, EMF & Internal Resistance

1. EMF of a cell can be defined as its:

Correct answer: Open-circuit voltage

2. The SI unit of EMF is:

Correct answer: Volt

3. The difference between a cell's EMF and terminal potential difference during discharge is called:

Correct answer: Lost volts

4. Internal resistance of a cell depends on factors including:

Correct answer: All of these

5. An ideal cell has internal resistance:

Correct answer: Zero

6. When external resistance is increased, terminal voltage of a discharging cell generally:

Correct answer: Increases toward EMF

7. Maximum power is delivered to an external resistance when:

Correct answer: R = r

8. A combination of cells is called a:

Correct answer: Battery

9. In a series connection of cells, the negative terminal of one cell is connected to the:

Correct answer: Positive terminal of the next

10. Cells are often grouped in parallel or mixed arrangements to obtain:

Correct answer: A desired current capability

Test 5 — Kirchhoff & Circuit Laws

1. Kirchhoff's first (junction) law is based on conservation of:

Correct answer: Charge

2. At a junction, the algebraic sum of currents is:

Correct answer: Zero

3. Kirchhoff's second (loop) law is based on conservation of:

Correct answer: Energy

4. Kirchhoff's second law is applied around a:

Correct answer: Closed loop

5. In a steady circuit, current entering a junction is equal to:

Correct answer: Current leaving

6. The equation ΣE = ΣIR is associated with:

Correct answer: Kirchhoff's second law

7. When traversing a loop, Kirchhoff's loop rule requires the algebraic sum of potential changes to be:

Correct answer: Zero

8. The current entering a junction is conventionally taken as:

Correct answer: Positive

9. The current leaving a junction is conventionally taken as:

Correct answer: Negative

10. Kirchhoff's laws are especially useful for:

Correct answer: Complicated electrical circuits

Test 6 — Wheatstone Bridge & Meter Bridge

1. A Wheatstone bridge contains how many resistances?

Correct answer: Four

2. A Wheatstone bridge is balanced when the galvanometer shows:

Correct answer: Zero deflection

3. In a balanced Wheatstone bridge, the galvanometer connects points that are at:

Correct answer: The same potential

4. A Wheatstone bridge is most sensitive when the four resistances are:

Correct answer: Of the same order of magnitude

5. The practical form of a Wheatstone bridge using a uniform wire is the:

Correct answer: Meter bridge

6. For minimum percentage error in a meter bridge, the balance point should preferably be near:

Correct answer: 50 cm

7. A meter bridge uses a resistance wire of approximately:

Correct answer: 100 cm

8. If a metal wire in one gap is heated and its resistance increases, the meter-bridge balance point shifts:

Correct answer: In the direction corresponding to increased resistance

9. A Wheatstone bridge is used to determine an unknown:

Correct answer: Resistance

10. Interchanging the battery and galvanometer in a balanced Wheatstone bridge leaves the galvanometer deflection:

Correct answer: Zero

Test 7 — Potentiometer

1. A potentiometer works on the principle that potential difference across a uniform wire is proportional to its:

Correct answer: Length

2. For accurate potentiometer measurements, the wire should be:

Correct answer: Uniform

3. A potentiometer wire should have relatively high:

Correct answer: Resistance

4. The balance point is the position where the galvanometer shows:

Correct answer: Null deflection

5. A potentiometer can be used to compare:

Correct answer: EMFs of cells

6. A potentiometer can be used to determine the:

Correct answer: Internal resistance of a cell

7. Increasing the length of potentiometer wire while maintaining the same total potential difference makes the potential gradient:

Correct answer: Decrease

8. If the potential gradient decreases, the balance length for the same EMF generally:

Correct answer: Increases

9. The potential difference V across a uniform potentiometer wire can be written as:

Correct answer: V = kl

10. A major advantage of a potentiometer is that at balance it measures EMF without:

Correct answer: Drawing appreciable current from the cell

Test 8 — Heating Effect & Electrical Power

1. Joule's law of heating is:

Correct answer: Q = I²Rt

2. Heat produced in a resistor is directly proportional to the:

Correct answer: Square of current

3. Heat produced in a resistor is proportional to:

Correct answer: Resistance

4. Heat produced by current also depends directly on:

Correct answer: Time of current flow

5. Electrical appliances based on the heating effect can operate on:

Correct answer: Both AC and DC

6. The SI unit of electrical energy is:

Correct answer: Joule

7. The commercial unit of electrical energy is:

Correct answer: Kilowatt-hour

8. A 100 W bulb operating for 60 s consumes:

Correct answer: 6000 J

9. In a purely resistive circuit, electrical energy supplied by the source appears primarily as:

Correct answer: Heat

10. In an active device such as a motor, part of supplied electrical energy is converted into:

Correct answer: Useful mechanical work

Test 9 — Instruments & Electrical Measurements

1. An ideal ammeter should have:

Correct answer: Very small resistance

2. An ideal voltmeter should have:

Correct answer: Very large resistance

3. An ammeter is connected in:

Correct answer: Series

4. A voltmeter is connected:

Correct answer: In parallel across the element

5. A galvanometer is primarily used to detect:

Correct answer: Small currents

6. A potentiometer measures potential more accurately because at balance it operates under:

Correct answer: Null condition

7. The sensitivity of a galvanometer can be increased by increasing the:

Correct answer: Number of turns of the coil

8. A rheostat is essentially used as a:

Correct answer: Variable resistor

9. A wire-wound resistor is also commonly called a:

Correct answer: Rheostat

10. A thermistor is formed using materials such as:

Correct answer: Metal oxides

Test 10 — Mixed Theory Revision

1. Which statement correctly distinguishes electronic and conventional current?

Correct answer: Electronic current is due to electron motion; conventional current is taken opposite to electron motion

2. In a current-carrying conductor, the net charge is generally:

Correct answer: Zero

3. The current in a conductor of non-uniform cross-section remains:

Correct answer: Constant in steady state

4. The free-electron density in a conductor of variable cross-section is:

Correct answer: Independent of cross-section in the stated steady-current case

5. The relaxation time of electrons in a metal generally:

Correct answer: Decreases as temperature increases

6. When a metal conductor is heated, its resistance generally:

Correct answer: Increases

7. When semiconductor temperature increases, its conductivity generally:

Correct answer: Increases

8. The reciprocal of resistivity is:

Correct answer: Conductivity

9. The phenomenon in which resistivity of certain materials becomes zero below a critical temperature is:

Correct answer: Superconductivity

10. The main purpose of a fuse is to:

Correct answer: Protect a circuit by melting when excessive current flows
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