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30 January 2023 physics questions with solutions
Browse 30 January 2023 Physics questions with solutions. Useful for JEE, NEET, and school exam revision.
Showing 1–10 of 60 questions
- MCQeasyCircular Motion
The height of liquid column raised in a capillary tube of certain radius when dipped in liquid A vertically is 5 cm. If the tube is dipped in a similar manner in another liquid B of surface tension and density double the values of liquid A, the height of liquid column raised in liquid B would be:
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JEE Mains30 January 2023Shift 1Morning Shift
Open question & full solution → - NumericmediumCircular Motion
A thin uniform rod of length 2 m, cross-sectional area A and density d is rotated about an axis passing through its centre and perpendicular to its length with angular velocity ω. If ω = √(αE/Ad), where E is its rotational kinetic energy, then the value of α is ______.
JEE Mains30 January 2023Shift 1Morning Shift
Open question & full solution → - NumericmediumCircular Motion
A stone tied to 180 cm long string at its end is making 28 revolutions in a horizontal circle every minute. The magnitude of acceleration of stone is 1936/x m s⁻². The value of x is ______. [Take π = 22/7]
JEE Mains30 January 2023Shift 2Evening Shift
Open question & full solution → - NumericmediumCircular Motion
A capacitor of capacitance 900 μF is charged by a 100 V battery. The capacitor is disconnected from the battery and connected to another uncharged identical capacitor with corresponding plates joined. The loss of energy in this process is measured as x × 10⁻² J. The value of x is ____.
JEE Mains30 January 2023Shift 1Morning Shift
Open question & full solution → - NumericmediumCircular Motion
In Young’s double slit experiment, two slits S₁ and S₂ are d distance apart and the separation from slits to screen is D. If two transparent slabs of equal thickness 0.1 mm but refractive indices 1.51 and 1.55 are introduced in the paths from S₁ and S₂ respectively, with λ = 4000 Å, the central bright fringe spot will shift by ______ number of fringes. Image
JEE Mains30 January 2023Shift 1Morning Shift
Open question & full solution → - MatcheasyCircular Motion
Match List I with List II:
List 1
Attenuation
Transducer
Demodulation
Repeater
List 2
I. Combination of a receiver and transmitter
II. Process of retrieval of information from the carrier wave at receiver
III. Converts one form of energy into another
IV. Loss of strength of a signal while propagating through a medium
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JEE Mains30 January 2023Shift 2Evening Shift
Open question & full solution → - MCQmediumCircular Motion
A massless square loop, of wire of resistance 10 Ω, supporting a mass of 1 g, hangs vertically with one of its sides in a uniform magnetic field of 10³ G directed outwards in the shaded region. A dc voltage V is applied to the loop. For what value of V will the magnetic force exactly balance the weight of the supporting mass? [Side of loop = 10 cm, g = 10 m s⁻²] Image
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JEE Mains30 January 2023Shift 1Morning Shift
Open question & full solution → - NumericmediumCircular Motion
As shown in figure, a cuboid lies in a region with electric field E = 2x²î - 4yĵ + 6k̂ N C⁻¹. The magnitude of charge within the cuboid is nε₀ C. The value of n is ______. [Dimensions of cuboid = 1 × 2 × 3 m³] Image
JEE Mains30 January 2023Shift 2Evening Shift
Open question & full solution → - NumericmediumCircular Motion
In an AC generator, a rectangular coil of 100 turns each having area 14 × 10⁻² m² is rotated at 360 rev min⁻¹ about an axis perpendicular to a uniform magnetic field of magnitude 3.0 T. The maximum value of the emf produced will be ______ V. [Take π = 22/7]
JEE Mains30 January 2023Shift 2Evening Shift
Open question & full solution → - MCQmediumCircular Motion
As per the given figure, a small ball P slides down the quadrant of a circle and hits the other ball Q of equal mass which is initially at rest. Neglecting the effect of friction and assume the collision to be elastic, the velocity of ball Q after collision will be: [g = 10 m s⁻²] Image
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JEE Mains30 January 2023Shift 1Morning Shift
Open question & full solution →