Free Test Ohm’s law – NEET

Q1: Which of the following represents Ohm’s law?

A. V = IR B. I = VR C. R = VI D. P = IV

Q2: What is the SI unit of resistance?

A. Ohm B. Volt C. Ampere D. Watt

Q3: If voltage increases across a resistor, the current will?

A. Increase B. Decrease C. Become zero D. Remain constant

Q4: What does the slope of V-I graph represent?

A. Resistance B. Power C. Current D. Voltage

Q5: Which of these materials does not obey Ohm’s law?

A. Semiconductor diode B. Copper wire C. Silver wire D. Nichrome wire

Q6: A wire has a resistance of 5Ω and a current of 2A flows through it. Voltage across it is:

A. 10V B. 2.5V C. 0.4V D. 7V

Q7: The resistance of a conductor depends on:

A. Length and area of cross-section B. Color C. Mass only D. Density only

Q8: Which instrument is used to measure resistance?

A. Ohmmeter B. Voltmeter C. Ammeter D. Galvanometer

Q9: Which factor does not affect resistance of a wire?

A. Voltage applied B. Length of wire C. Material of wire D. Cross-sectional area

Q10: Which is the correct relation between current and resistance (constant voltage)?

A. I ∝ 1/R B. I ∝ R C. I ∝ V² D. I ∝ √R

Q11: A wire obeys Ohm’s law. If current is halved, power dissipated is?

A. Reduced to one-fourth B. Doubled C. Remains same D. Increased four times

Q12: At constant current, if resistance increases, voltage must?

A. Increase B. Decrease C. Remain same D. Be zero

Q13: Which of the following is a correct combination for Ohm’s law?

A. Current ∝ Voltage B. Current ∝ Resistance C. Voltage ∝ 1/Current D. Resistance ∝ Current

Q14: What does the term "ohmic" mean?

A. Obeys Ohm’s law B. Does not obey Ohm’s law C. Has no resistance D. Conducts only at high voltages

Q15: A device with constant resistance is connected to a variable power supply. As voltage increases, current?

A. Increases linearly B. Remains same C. Decreases D. Drops to zero

Q16: Current through a resistor is zero if:

A. Voltage is zero B. Resistance is zero C. Both are zero D. Current never becomes zero

Q17: Unit of conductance is:

A. Siemens B. Ohm C. Volt D. Ampere

Q18: If length of wire is doubled, and cross-section is halved, resistance becomes:

A. 4 times B. 2 times C. Same D. Half

Q19: Power dissipated in a resistor using Ohm’s law is given by:

A. P = V²/R B. P = IR² C. P = V/I D. P = I/V

Q20: What causes resistance in a wire?

A. Collision of electrons with atoms B. Smooth flow of electrons C. Zero temperature D. Uniform motion

Quiz for Ohm’s law