NEET UG 2025: Here are 25 questions from the Current Electricity section of Physics. This is part of a series of sets curated by the edufever team for NEET aspirants. Solving this will be very helpful for students.
These questions are structured to challenge conceptual clarity and application in Electric Current for NEET preparation.
Join NEET News 2025 Here are 25 challenging objective-type questions on Current Electricity for NEET UG 2025:
1. A wire of length L and resistance R is stretched uniformly so that its length doubles. The new resistance becomes:
(a) R
(b) 2R
(c) 4R
(d) R/2
2. When a resistance wire is heated, its resistivity increases due to:
(a) Increase in length
(b) Increase in electron density
(c) Decrease in electron relaxation time
(d) Increase in electron charge
3. The drift velocity of electrons in a metallic conductor depends on:
(a) Temperature of the conductor
(b) Potential difference applied
(c) Length of the conductor
(d) All of the above
4. Kirchhoff’s laws are applicable when electric circuits are analyzed based on:
(a) Conservation of mass
(b) Conservation of charge and energy
(c) Conservation of momentum
(d) Conservation of power
5. Two wires of identical dimensions, one copper and one nichrome, are connected in series. Which will dissipate more heat?
(a) Copper wire
(b) Nichrome wire
(c) Equal heat in both
(d) Depends on the voltage
6. Which device maintains a constant potential difference across a circuit?
(a) Ammeter
(b) Voltmeter
(c) Battery
(d) Rheostat
7. A potentiometer wire is 10 m long with a resistance of 10 Ω. It is connected in series with a 2 V battery. The potential gradient along the wire is:
(a) 0.02 V/m
(b) 0.2 V/m
(c) 2 V/m
(d) 20 V/m
8. The sensitivity of a potentiometer can be increased by:
(a) Decreasing potential difference
(b) Increasing potential difference
(c) Decreasing length of the wire
(d) Increasing current in the wire
9. A 100 W bulb rated at 200 V is operated at 100 V. Its power output will be approximately:
(a) 100 W
(b) 50 W
(c) 25 W
(d) 10 W
10. The internal resistance of a cell is minimum when:
(a) Current drawn is minimum
(b) Electrolyte temperature is maximum
(c) Electrodes are farther apart
(d) Electrolyte concentration is reduced
11. If the temperature coefficient of resistance of a conductor is negative, then with increasing temperature:
(a) Resistance remains same
(b) Resistance decreases
(c) Resistance increases
(d) Becomes infinite
12. An electric bulb connected to 220 V draws 0.5 A current. The resistance of the bulb filament is:
(a) 110 Ω
(b) 220 Ω
(c) 440 Ω
(d) 55 Ω
13. Wheatstone bridge is most sensitive when all four resistances are:
(a) Very high
(b) Very low
(c) Equal or nearly equal
(d) Unbalanced significantly
14. Two identical resistors are connected first in parallel and then in series. The ratio of power consumed in parallel and series combination for the same applied voltage is:
(a) 1:2
(b) 2:1
(c) 1:4
(d) 4:1
15. The resistivity of a semiconductor with rise in temperature:
(a) Increases exponentially
(b) Decreases exponentially
(c) Remains constant
(d) Increases linearly
16. An ammeter should ideally have:
(a) High resistance and low shunt
(b) Low resistance and high shunt
(c) High resistance and high shunt
(d) Low resistance and low shunt
17. The drift velocity of electrons in a conductor depends upon:
(a) Electron mass and temperature
(b) Electric field and electron density
(c) Resistance and electron mass
(d) Electron density and resistance
18. Two wires of resistances 2 Ω and 3 Ω are connected in parallel. Their equivalent resistance is:
(a) 6 Ω
(b) 5 Ω
(c) 1.2 Ω
(d) 0.6 Ω
19. The drift velocity of electrons in copper is very small, yet current is established instantly. This is because:
(a) Electrons move at nearly the speed of light
(b) Electric field propagates instantly through the conductor
(c) Potential difference travels very fast
(d) Electrons move collectively at high speed
20. The internal resistance of a cell depends upon:
(a) Nature of electrolyte
(b) Distance between electrodes
(c) Area of electrodes dipped
(d) All of these
21. Two wires of resistances R and 2R are connected in parallel. If the combination has a power dissipation of P, the power dissipated by resistor R alone is:
(a) 2P/3
(b) P/2
(c) P
(d) P/3
22. A potentiometer measures potential difference more accurately than a voltmeter because:
(a) It does not draw current
(b) It draws infinite current
(c) It measures resistance directly
(d) It uses magnetic fields
23. Two identical cells, each of emf E and internal resistance r are connected in parallel. Their effective emf and internal resistance are:
(a) E, r/2
(b) 2E, r/2
(c) E, 2r
(d) 2E, 2r
24. The temperature coefficient of resistance for metals is generally:
(a) Negative and large
(b) Negative and small
(c) Positive and large
(d) Positive and small
25. Which of the following materials has the lowest resistivity at room temperature?
(a) Copper
(b) Silver
(c) Aluminium
(d) Iron
Answer Key:
1.(c), 2.(c), 3.(d), 4.(b), 5.(b), 6.(c), 7.(b), 8.(a), 9.(c), 10.(b), 11.(b), 12.(c), 13.(c), 14.(d), 15.(b), 16.(d), 17.(b), 18.(c), 19.(b), 20.(d), 21.(a), 22.(a), 23.(a), 24.(d), 25.(b)
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These questions are aimed at thoroughly testing conceptual depth, analytical thinking, and numerical proficiency in Current Electricity for NEET UG 2025 aspirants.
