Free physics question bank
31 January 2023 physics questions with solutions
Browse 31 January 2023 Physics questions with solutions. Useful for JEE, NEET, and school exam revision.
Showing 1–10 of 60 questions
- MCQmediumCircular Motion
A rod with circular cross-section area 2 cm² and length 40 cm is wound uniformly with 400 turns of an insulated wire. If a current of 0.4 A flows in the wire windings, the total magnetic flux produced inside windings is 4π × 10⁻⁶ Wb. The relative permeability of the rod is: [μ₀ = 4π × 10⁻⁷ N A⁻²]
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JEE Mains31 January 2023Shift 1Morning Shift
Open question & full solution → - MCQmediumCircular Motion
The pressure of a gas changes linearly with volume from A to B as shown in figure. If no heat is supplied to or extracted from the gas then change in the internal energy of the gas will be: Image
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JEE Mains31 January 2023Shift 1Morning Shift
Open question & full solution → - MatcheasyCircular Motion
Match List-I with List-II:
List 1
Microwaves
UV rays
Infra-red rays
X-rays
List 2
I. Physiotherapy
II. Treatment of cancer
III. LASIK eye surgery
IV. Aircraft navigation
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JEE Mains31 January 2023Shift 2Evening Shift
Open question & full solution → - MCQmediumCircular Motion
A hypothetical gas expands adiabatically such that its volume changes from 8 litres to 27 litres. If the ratio of final pressure to initial pressure is 16/81, then the ratio C(p)/C(v) will be:
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JEE Mains31 January 2023Shift 2Evening Shift
Open question & full solution → - NumericmediumCircular Motion
Two parallel plate capacitors C₁ and C₂ each of capacitance 10 μF are individually charged by a 100 V DC source. C₁ remains connected to source while a dielectric slab of dielectric constant 10 is inserted. C₂ is disconnected before inserting the same dielectric. Afterwards C₁ is also disconnected and the two capacitors are connected in parallel. The common potential is ______ V.
JEE Mains31 January 2023Shift 2Evening Shift
Open question & full solution → - MCQeasyCircular Motion
The effect of increase in temperature on the number of electrons in conduction band n(e) and resistance of a semiconductor will be as:
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JEE Mains31 January 2023Shift 1Morning Shift
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Given below are two statements: Statement I: In a typical transistor, all three regions emitter, base and collector have same doping level. Statement II: In a transistor, collector is the thickest and base is the thinnest segment. Choose the most appropriate answer:
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JEE Mains31 January 2023Shift 2Evening Shift
Open question & full solution → - MCQmediumCircular Motion
Under the same load, wire A having length 5.0 m and cross-section 2.5 × 10⁻⁵ m² stretches by the same amount as another wire B of length 6.0 m and cross-section 3.0 × 10⁻⁵ m². The ratio of Young's modulus of wire A to that of wire B is:
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JEE Mains31 January 2023Shift 2Evening Shift
Open question & full solution → - NumericmediumCircular Motion
An inductor of 0.5 mH, a capacitor of 20 μF and resistance of 20 Ω are connected in series with a 220 V AC source. If the current is in phase with the emf, the amplitude of current is √x A. The value of x is:
JEE Mains31 January 2023Shift 1Morning Shift
Open question & full solution → - MCQeasyCircular Motion
An alternating voltage source V = 260 sin(628t) is connected across a pure inductor of 5 mH. Inductive reactance in the circuit is:
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JEE Mains31 January 2023Shift 2Evening Shift
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