Refer to CBSE Class 12 Physics Current Electricity MCQs provided below available for download in Pdf. The MCQ Questions for Class 12 Physics with answers are aligned as per the latest syllabus and exam pattern suggested by CBSE, NCERT and KVS. Multiple Choice Questions for Chapter 3 Current Electricity are an important part of exams for Class 12 Physics and if practiced properly can help you to improve your understanding and get higher marks. Refer to more Chapter-wise MCQs for CBSE Class 12 Physics and also download more latest study material for all subjects
MCQ for Class 12 Physics Chapter 3 Current Electricity
Class 12 Physics students should refer to the following multiple-choice questions with answers for Chapter 3 Current Electricity in Class 12.
Chapter 3 Current Electricity MCQ Questions Class 12 Physics with Answers
Question: The cold junction of a thermocouple is maintained at 10ºC. No thermo e.m.f. is developed when the hot junction is maintained at 530ºC. The neutral temperature is
(a) 260ºC
(b) 265ºC
(c) 270ºC
(d) 520ºC
Answer: C
Question: Consider a current carrying wire (current I) in the shape of a circle
(a) source of emf
(b) electric field produced by charges accumulated on the surface of wire
(c) the charges just behind a given segment of wire which push them just the right way by repulsion
(d) the charges ahead
Answer: B
Question: Two cells of emfs approximately 5 V and 10 V are to be accurately compared using a potentiometer of length 400 cm.
(a) The battery that runs the potentiometer should have voltage of 8V.
(b) The battery of potentiometer can have a voltage of 15 V and R adjusted so that the potential drop across the wire slightly exceeds 10 V.
(c) The first portion of 50 cm of wire itself should have a potential drop of 10 V.
(d) Potentiometer is usually used for comparing resistances and not voltages.
Answer: B
Question: Which of the following characteristics of electrons determines the current in a conductor?
(a) Drift velocity alone
(b) Thermal velocity alone
(c) Both drift velocity and thermal velocity
(d) Neither drift nor thermal velocity
Answer: A
Question: The cold junction of a thermocouple is maintained at 10ºC. No thermo e.m.f. is developed when the hot junction is maintained at 530ºC. The neutral temperature is
(a) 260ºC
(b) 265ºC
(c) 270ºC
(d) 520ºC
Answer: C
Question: In a large building, there are 15 bulbs of 40 W, 5 bulbs of 100 W, 5 fans of 80 W and 1 heater of 1 kW. The voltage of electric mains is 220 V. The minimum capacity of the main fuse of the building will be:
(a) 8 A
(b) 10 A
(c) 12 A
(d) 14 A
Answer: C
Question: Choose the correct option
Assertion : When current through a bulb decreases by 0.5%, the glow of bulb decreases by 1%.
Reason : Glow (Power) which is directly proportional to square of current
(a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(b) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
(c) If Assertion is correct but Reason is incorrect.
(d) If both the Assertion and Reason are incorrect.
Answer: A
Question: A constant voltage is applied between the two ends of a uniform metallic wire. Some heat is developed in it. The heat developed is doubled if
(a) both the length and the radius of the wire are halved.
(b) both the length and the radius of the wire are doubled.
(c) the radius of the wire is doubled.
(d) the length of the wire is doubled.
Answer: B
Question: A potentiometer wire is 100 cm long and a constant potential difference is maintained across it. Two cells are connected in series first to support one another and then in opposite direction. The balance points are obtained at 50 cm and 10 cm from the positive end of the wire in the two cases. The ratio of emf's is :
(a) 5 : 1
(b) 5 : 4
(c) 3 : 4
(d) 3 : 2
Answer: D
Question: Choose the correct option
Assertion : Bending a wire does not effect electrical resistance.
Reason : Resistance of wire is proportional ot resistivity of material.
(a) If both Assertion and Reason are correct and Reasonis the correct explanation of Assertion.
(b) If both Assertion and Reason are correct, but Reasonis not the correct explanation of Assertion.
(c) If Assertion is correct but Reason is incorrect.
(d) If both the Assertion and Reason are incorrect.
Answer: A
(b) 6.25 x 10–18 coulomb
(d) infinite
(b) pulsating current
(d) alternating current
(b) Drift velocity
(d) Free-electron density
(b) conductivity
(d) resistance
(b) E : J k
(d) k : J E
(b) R : r/n
(d) R → ∞, r →0
(b) R < r
(d) R : r/2
(b) energy
(d) angular momentum
Question: A potentiometer is an accurate and versatile device to make electrical measurements of E.M.F. because the method involves
(a) Potential gradients
(b) A condition of no current flow through the galvanometer
(c) A combination of cells, galvanometer and resistances
(d) Cells
Answer: B
Question: Choose the correct option
Assertion : Kirchoff¢s junction rule follows fromconservation of charge.
Reason : Kirchoff¢s loop rule follows from conservation of momentum
(a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(b) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
(c) If Assertion is correct but Reason is incorrect.
(d) If both the Assertion and Reason are incorrect.
Answer: C
Question: Which of the following statements is false ?
(a) A rheostat can be used as a potential divider
(b) Kirchhoff's second law represents energy conservation
(c) Wheatstone bridge is the most sensitive when all the four resistances are of the same order of magnitude
(d) In a balanced wheatstone bridge if the cell and the galvanometer are exchanged, the null point is disturbed.
Answer: D
Question: Choose the correct option
Assertion : A current flows in a conductor only when there is an electric field within the conductor.
Reason : The drift velocity of electron in presence of electric field decreases.
(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion.
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct.
Answer: C
Question: Ten identical cells connected in series are needed to heat a wire of length one meter and radius ‘r’ by 10ºC in time ‘t’. How many cells will be required to heat the wire of length two meter of the same radius by the same temperature in time ‘t’?
(a) 10
(b) 20
(c) 30
(d) 40
Answer: B
Question: An electric heating element in vacuum is surrounded by a cavity at constant temperature of 227ºC; it consumes 60W of power to maintain a temperature of 727ºC. What is the power consumed by the element to maintain a temperature of 1227º C?
(a) 101 W
(b) 304 W
(c) 90 W
(d) 320 W
Answer: D
Question: An electrical cable of copper has just one wire of radius 9 mm. Its resistance is 5 ohm. This single copper wire of the cable is replaced by 6 different well insulated copper wires each of radius 3 mm. The total resistance of the cable will now be equal to
(a) 7.5 ohm
(b) 45 ohm
(c) 90 ohm
(d) 270 ohm
Answer: A
Question: A hank of uninsulated wire consisting of seven and a half turns is stretched between two nails hammered into a board to which the ends of the wire are fixed. The resistance of the circuit between the nails is determined with the help of electrical measuring instruments. Determine the proportion in which the resistance will change if the wire is unwound so that the ends remain to be fixed to the nails.
(a) 225
(b) 15
(c) 240
(d) 250
Answer: A
Question: To get maximum current in a resistance of 3 ohms, one can use n rows of m cells (connected in series) connected in parallel. If the total number of cells is 24 and the internal resistance of a cell is 0.5 ohms then
(a) m : 12, n : 2
(b) m : 8, n : 3
(c) m : 2, n : 12
(d) m : 6, n : 4
Answer: A
Question: An Aluminium (Al) rod with area of cross-section 4 × 10–6 m2 has a current of 5 ampere. Flowing through it. Find the drift velocity of electron in the rod. Density of Al : 2.7 × 103 kg/m3 and Atomic wt. : 27. Assume that each Al atom provides one electron
(a) 8.6 × 10–4 m/s
(b) 1.29 × 10–4 m/s
(c) 2.8 × 10–2 m/s
(d) 3.8 × 10–3 m/s
Answer: B
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MCQs for Chapter 3 Current Electricity Physics Class 12
Expert teachers of studiestoday have referred to NCERT book for Class 12 Physics to develop the Physics Class 12 MCQs. If you download MCQs with answers for the above chapter you will get higher and better marks in Class 12 test and exams in the current year as you will be able to have stronger understanding of all concepts. Daily Multiple Choice Questions practice of Physics will help students to have stronger understanding of all concepts and also make them expert on all critical topics. After solving the questions given in the MCQs which have been developed as per latest books also refer to the NCERT solutions for Class 12 Physics. We have also provided lot of MCQ questions for Class 12 Physics so that you can solve questions relating to all topics given in each chapter. After solving these you should also refer to Class 12 Physics MCQ Test for the same chapter.
You can download the CBSE MCQs for Class 12 Physics Chapter 3 Current Electricity for latest session from StudiesToday.com
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