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:
2. What is the SI unit of electric current?
3. The driving force in a working electrical circuit is:
4. Drift velocity of electrons is caused by:
5. In the absence of an electric field, the mean velocity of free electrons in a conductor is:
6. Which electron characteristic determines current in a conductor?
7. The direction of conventional current is taken from:
8. Why does an electric bulb glow almost immediately after a switch is closed?
9. In a steady current flowing through a conductor of non-uniform cross-section, which quantity remains constant?
10. Current density is defined as:
Test 2 — Resistance & Resistivity
1. Resistance of a uniform conductor is given by:
2. Resistivity is an intrinsic property that primarily depends on:
3. If the length and radius of a wire are both doubled, its resistance becomes:
4. The specific resistance (resistivity) of a wire is independent of:
5. The reciprocal of resistance is called:
6. The SI unit of conductance is:
7. For metals, resistivity generally:
8. For semiconductors, resistivity generally:
9. Which material has relatively weak temperature dependence of resistivity?
10. Constantan is suitable for standard resistance mainly because it has:
Test 3 — Ohm’s Law & Conductors
1. Ohm's law states that, at constant physical conditions:
2. For an ohmic conductor, the V-I graph is:
3. Which is a non-ohmic device?
4. A metallic conductor may deviate from Ohm's law at high current because:
5. A carbon resistor is generally identified by:
6. Resistor colour coding is mainly used to determine its:
7. The third band in a common carbon-resistor colour code indicates:
8. The tolerance band in a resistor indicates:
9. The product of resistivity and conductivity is:
10. The relation between electric field E, current density J and resistivity ρ is:
Test 4 — Cells, EMF & Internal Resistance
1. EMF of a cell can be defined as its:
2. The SI unit of EMF is:
3. The difference between a cell's EMF and terminal potential difference during discharge is called:
4. Internal resistance of a cell depends on factors including:
5. An ideal cell has internal resistance:
6. When external resistance is increased, terminal voltage of a discharging cell generally:
7. Maximum power is delivered to an external resistance when:
8. A combination of cells is called a:
9. In a series connection of cells, the negative terminal of one cell is connected to the:
10. Cells are often grouped in parallel or mixed arrangements to obtain:
Test 5 — Kirchhoff & Circuit Laws
1. Kirchhoff's first (junction) law is based on conservation of:
2. At a junction, the algebraic sum of currents is:
3. Kirchhoff's second (loop) law is based on conservation of:
4. Kirchhoff's second law is applied around a:
5. In a steady circuit, current entering a junction is equal to:
6. The equation ΣE = ΣIR is associated with:
7. When traversing a loop, Kirchhoff's loop rule requires the algebraic sum of potential changes to be:
8. The current entering a junction is conventionally taken as:
9. The current leaving a junction is conventionally taken as:
10. Kirchhoff's laws are especially useful for:
Test 6 — Wheatstone Bridge & Meter Bridge
1. A Wheatstone bridge contains how many resistances?
2. A Wheatstone bridge is balanced when the galvanometer shows:
3. In a balanced Wheatstone bridge, the galvanometer connects points that are at:
4. A Wheatstone bridge is most sensitive when the four resistances are:
5. The practical form of a Wheatstone bridge using a uniform wire is the:
6. For minimum percentage error in a meter bridge, the balance point should preferably be near:
7. A meter bridge uses a resistance wire of approximately:
8. If a metal wire in one gap is heated and its resistance increases, the meter-bridge balance point shifts:
9. A Wheatstone bridge is used to determine an unknown:
10. Interchanging the battery and galvanometer in a balanced Wheatstone bridge leaves the galvanometer deflection:
Test 7 — Potentiometer
1. A potentiometer works on the principle that potential difference across a uniform wire is proportional to its:
2. For accurate potentiometer measurements, the wire should be:
3. A potentiometer wire should have relatively high:
4. The balance point is the position where the galvanometer shows:
5. A potentiometer can be used to compare:
6. A potentiometer can be used to determine the:
7. Increasing the length of potentiometer wire while maintaining the same total potential difference makes the potential gradient:
8. If the potential gradient decreases, the balance length for the same EMF generally:
9. The potential difference V across a uniform potentiometer wire can be written as:
10. A major advantage of a potentiometer is that at balance it measures EMF without:
Test 8 — Heating Effect & Electrical Power
1. Joule's law of heating is:
2. Heat produced in a resistor is directly proportional to the:
3. Heat produced in a resistor is proportional to:
4. Heat produced by current also depends directly on:
5. Electrical appliances based on the heating effect can operate on:
6. The SI unit of electrical energy is:
7. The commercial unit of electrical energy is:
8. A 100 W bulb operating for 60 s consumes:
9. In a purely resistive circuit, electrical energy supplied by the source appears primarily as:
10. In an active device such as a motor, part of supplied electrical energy is converted into:
Test 9 — Instruments & Electrical Measurements
1. An ideal ammeter should have:
2. An ideal voltmeter should have:
3. An ammeter is connected in:
4. A voltmeter is connected:
5. A galvanometer is primarily used to detect:
6. A potentiometer measures potential more accurately because at balance it operates under:
7. The sensitivity of a galvanometer can be increased by increasing the:
8. A rheostat is essentially used as a:
9. A wire-wound resistor is also commonly called a:
10. A thermistor is formed using materials such as:
Test 10 — Mixed Theory Revision
1. Which statement correctly distinguishes electronic and conventional current?
2. In a current-carrying conductor, the net charge is generally:
3. The current in a conductor of non-uniform cross-section remains:
4. The free-electron density in a conductor of variable cross-section is:
5. The relaxation time of electrons in a metal generally:
6. When a metal conductor is heated, its resistance generally:
7. When semiconductor temperature increases, its conductivity generally:
8. The reciprocal of resistivity is:
9. The phenomenon in which resistivity of certain materials becomes zero below a critical temperature is:
10. The main purpose of a fuse is to:
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