NEET UG PHYSICS Multiple Choice Questions (MCQs)
Multiple Choice Questions - Current Electricity (NEET UG)
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What is the relation between drift velocity (v_d), mobility (μ), and electric current (I)?
- a) I = nA μ v_d
- b) I = nA μ / v_d
- c) I = nA v_d μ
- d) I = nA v_d
Answer: a) I = nA μ v_d
-
Ohm's law states that the current through a conductor is directly proportional to:
- a) The temperature of the conductor
- b) The potential difference across the conductor
- c) The resistivity of the conductor
- d) The length of the conductor
Answer: b) The potential difference across the conductor
-
The resistance of a conductor is 10 ohms. If the temperature increases, the resistance becomes 15 ohms. This suggests the conductor is:
- a) A non-metallic conductor
- b) An ohmic conductor
- c) A metallic conductor
- d) A non-ohmic conductor
Answer: c) A metallic conductor
-
What is the potential difference across an ohmic conductor when 3 A current flows through it and the resistance is 2 ohms?
- a) 5 V
- b) 6 V
- c) 3 V
- d) 2 V
Answer: b) 6 V
-
Which of the following is true for an Ohmic conductor?
- a) It has a linear V-I characteristic.
- b) It has a non-linear V-I characteristic.
- c) The resistance changes with temperature.
- d) It behaves like a semiconductor.
Answer: a) It has a linear V-I characteristic.
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The electrical energy dissipated in a resistor is given by which of the following formulas?
- a) W = I2 R
- b) W = V2 R
- c) W = I R2
- d) W = V I
Answer: a) W = I2 R
-
The unit of electrical resistivity is:
- a) Ω
- b) Ω · m
- c) Ω/m
- d) Ω · m2
Answer: b) Ω · m
-
Which of the following combinations of resistors will result in a total resistance that is greater than any of the individual resistances?
- a) Series combination
- b) Parallel combination
- c) Both series and parallel combinations
- d) None of the above
Answer: a) Series combination
-
The equivalent resistance of two resistors, 6Ω and 3Ω, in parallel is:
- a) 9Ω
- b) 2Ω
- c) 1Ω
- d) 2.1Ω
Answer: b) 2Ω
-
What is the internal resistance of a cell if the emf is 12V and the terminal voltage is 10V when a current of 2A is drawn?
- a) 1 Ω
- b) 2 Ω
- c) 3 Ω
- d) 4 Ω
Answer: a) 1 Ω
-
If two cells, each with emf 6V and internal resistance 1Ω, are connected in series, what is the total emf and internal resistance?
- a) 6V, 1Ω
- b) 12V, 2Ω
- c) 6V, 2Ω
- d) 12V, 1Ω
Answer: b) 12V, 2Ω
-
Kirchhoff’s first law is based on the principle of conservation of:
- a) Energy
- b) Charge
- c) Power
- d) Potential
Answer: b) Charge
-
In a Wheatstone bridge, if the ratio of the resistances in one arm is 3:4 and the ratio in the other arm is 4:3, the bridge is:
- a) Balanced
- b) Unbalanced
- c) Open
- d) Shorted
Answer: a) Balanced
-
What is the main use of a metre bridge?
- a) To measure the resistance of an unknown resistor
- b) To measure the potential difference across a resistor
- c) To determine the emf of a cell
- d) To calculate the resistivity of a material
Answer: a) To measure the resistance of an unknown resistor
-
In a circuit with a 12V battery and a 6Ω resistor, the current flowing through the circuit is:
- a) 1 A
- b) 2 A
- c) 0.5 A
- d) 3 A
Answer: b) 2 A
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