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NEET UG Current Electricity — practice questions

93 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.

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Electric current is defined as the rate of flow of:The SI unit of electric current is the:Ohm's law (for a conductor at constant temperature) states that V is proportional to:The SI unit of resistance is the:Resistance R of a uniform wire of length l, area A, resistivity ρ is:If a wire of resistance R is stretched to twice its length (volume conserved), its new resistance becomes:Conductors with metallic bonding have resistivity that, with rising temperature, typically:For semiconductors, the temperature coefficient of resistance is generally:Drift velocity v_d of free electrons in a conductor relates to current density J as (n = number density, e = eResistors of values R₁ and R₂ connected in series give equivalent resistance:Resistors of values R₁ and R₂ in parallel give equivalent resistance:Two 6 Ω resistors in parallel give an equivalent resistance of:Kirchhoff's junction (current) rule is a statement of:Kirchhoff's loop (voltage) rule is a statement of:The EMF of a cell is the potential difference across its terminals when the current drawn is:For a battery of EMF ε and internal resistance r supplying current I, terminal voltage V equals:Power dissipated in a resistor R carrying current I is:Heat produced in a resistor follows Joule's heating law H equals:In a Wheatstone bridge at balance, the relation between resistances is:A galvanometer is converted into an ammeter by connecting a small resistance:A galvanometer is converted into a voltmeter by connecting a large resistance:An ideal ammeter has resistance:An ideal voltmeter has resistance:For three identical resistors R combined in parallel, the equivalent resistance is:A 100 W, 220 V bulb has resistance (when operating):Resistivity has SI unit:Conductivity σ is related to resistivity ρ by:The drift velocity of electrons in a conductor under an electric field E is proportional to:In a series combination of resistors, the same quantity that is shared by all resistors is the:The resistance of the filament of a lamp increases with the increase in temperature. A lamp rated $100\mathrm{In the circuit shown in figure reading of voltmeter is $V_{1}$ when only $S_{1}$ is closed, reading of voltmetIn the given circuit, it is observed that the current $I$ is independent of the value of the resistance $R_{6}Find out the value of current through $2\,\Omega$ resistance for the given circuit ![](https://qallery.app/diConsider four circuits shown in the figure below. In which circuit power dissipated is greatest (Neglect the iA resistor carries a current of 2 A when a potential difference of 10 V is applied across it. Its resistance iThe SI unit of current density is:For a uniform wire of resistance R = ρl/A, the resistivity ρ depends on:When an electric field E is applied along a metallic conductor, the conduction electrons acquire a drift velocThe power dissipated in a resistor of resistance R carrying a steady current I is:The emf of a cell is equal to the potential difference across its terminals when:Three resistors of 2 Ω, 3 Ω and 5 Ω are connected in series. The equivalent resistance is:Two 6 Ω resistors are connected in parallel. Their equivalent resistance is:A cell of emf 2 V and internal resistance 0.1 Ω is connected across a 3.9 Ω resistor. The current in the circuA cell of emf 2 V and internal resistance 0.1 Ω drives a current of 0.5 A. Its terminal potential difference iIn a metallic wire of fixed n and area A, if the current is doubled, the electron drift speed:A wire is stretched to twice its original length while keeping its volume constant. Its new resistance is:Two bulbs rated 100 W and 60 W are designed for the same supply voltage. Compared with the 60 W bulb, the 100 A platinum resistance thermometer reads 5.00 Ω at 0°C and 5.23 Ω at 100°C. When its resistance is 5.795 Ω, theThe heat produced in a 5 Ω resistor carrying a steady current of 2 A for 10 s is:Estimate the drift speed of electrons in a copper wire carrying 1.5 A with cross-section 1.0×10⁻⁷ m² and n = 8A nichrome heating element has resistance 75.3 Ω at 27°C. On a 230 V supply it settles to a steady current of Two cells, each of emf 1.5 V and internal resistance 0.5 Ω, are connected in series across a 2 Ω resistor. TheTwo identical cells, each of emf 1.5 V and internal resistance 0.5 Ω, are connected in parallel across a 1 Ω rThe maximum current that can be drawn from a cell of emf 1.5 V and internal resistance 0.3 Ω is:Power loss in transmission cables of resistance Rc delivering power P at voltage V is P²Rc/V². To minimise thiAt a junction, currents of 3 A and 5 A flow in, and 2 A flows out through one branch. By Kirchhoff's junction A Wheatstone bridge is balanced with arms P = 10 Ω, Q = 20 Ω and R = 15 Ω. The unknown resistance S is:A 3 Ω resistor is connected in series with a parallel combination of a 6 Ω and a 3 Ω resistor. The equivalent When the temperature of a metallic conductor rises, its resistivity increases mainly because:A bulb of resistance $240$ $\Omega$ is connected across $120$ V. Current through it is:A copper wire of length $L$ and area $A$ has resistance $R$. If length is doubled and area halved, the new resTwo resistors $3\ \Omega$ and $6\ \Omega$ are connected in parallel. The equivalent resistance is:A cell of EMF $1.5$ V and internal resistance $0.5\ \Omega$ delivers $1$ A to a bulb. Terminal voltage is:Ohm's law gives the relation between V, I, R as:Resistance R of a wire depends on its length L, area A, and resistivity ρ as:Resistivity of a typical metallic conductor as temperature increases:Two resistors R₁ and R₂ in SERIES have equivalent resistance:Two resistors R₁ and R₂ in PARALLEL have equivalent resistance:The drift velocity v_d of conduction electrons is related to current density J (n = number density, e = electrAn ideal ammeter has resistance:A galvanometer of resistance G can be converted into a voltmeter of range V by connecting in series a high resA cell of emf ε and internal resistance r is connected to an external resistance R. The current is:Power dissipated in a resistor R carrying current I is:Two 100-W bulbs are connected in series across 220 V. The total power consumed is:Kirchhoff's junction rule (KCL) is a consequence of:In a Wheatstone bridge, balance condition is:Drift speed of electrons in a copper wire of cross-section A carrying current I is approximately:EMF of a cell is defined as:If a conductor of length l and cross-sectional area A has resistivity ρ, halving the length AND halving the arThe drift velocity of electrons in a copper wire carrying steady current is of the order ofFor a metallic conductor obeying Ohm law, if temperature increasesThree resistors 6 Ω, 6 Ω and 6 Ω are connected between the same two points, with two in parallel and the thirdA copper wire and an aluminium wire have the same length and same cross-sectional area. If ρ_Cu = 1.7 × 10⁻⁸ ΩA cell of emf ε and internal resistance r is connected to an external resistance R. The maximum power delivereIn a Wheatstone bridge, arms have resistances P, Q, R, S in cyclic order with a galvanometer between the P-Q aA potentiometer of length L is used to compare emfs. If the balance lengths for cells of emf ε₁ and ε₂ are l₁ Two cells of emf ε and internal resistance r each are connected in parallel. The equivalent emf and internal rKirchhoff current law at a junction is a statement ofA wire has a resistance R. It is stretched uniformly so that its length becomes 2L. The new resistance isThe relation between current density j, drift velocity v_d, number density n and charge e for a metallic conduA galvanometer of resistance G shows full-scale deflection at current I_g. To convert it into an ammeter readiA galvanometer of resistance G is converted into a voltmeter reading full-scale voltage V byFor a battery of emf ε and internal resistance r driving current I through external resistance R, the terminal