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21 January Evening Shift physics questions with solutions
Browse 21 January Evening Shift Physics questions with solutions. Useful for JEE, NEET, and school exam revision.
Showing 1–10 of 25 questions
- MCQeasyThermodynamics
The r.m.s speed of oxygen molecules at 47°C is equal to that of the hydrogen molecules kept at______°C. (Mass of oxygen molecule/mass of hydrogen molecule=32/2)
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JEE Mains 202621 January Evening Shift
Open question & full solution → - MCQeasyUnit dimension and error
Keeping the significant figures in view, the sum of the physical quantities 52.01m, 153.2 m and 0.123 m is :
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JEE Mains 202621 January Evening Shift
Open question & full solution → - NumericeasyProperties of solid and fluid
The terminal velocity of a metallic ball of radius 6 mm in a viscous fluid is 20 cm/s. The terminal velocity of another ball of same material and having radius 3 mm in the same fluid will be ________ cm/s.
JEE Mains 202621 January Evening Shift
Open question & full solution → - MCQmediumRotational Motion
The pulley shown in figure is made using a thin rim and two rods of length equal to diameter of the rim. The rim and each rod have a mass of M. Two blocks of mass of M and m are attached to two ends of a light string passing over the pulley, which is hinged to rotate freely in vertical plane about its centre. The magnitudes of the acceleration experienced by the blocks is____ (assume no slipping of string on pulley.)
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JEE Mains 202621 January Evening Shift
Open question & full solution → - MCQeasyCurrent electricity
A battery with EMF E and internal resistance r is connected across a resistance R. The power consumption in R will be maximum when :
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JEE Mains 202621 January Evening Shift
Open question & full solution → - MCQmediumAtomic Structure and X-rays
The energy of an electron in an orbit of the Bohr’s atom is -0.04E₀ eV where E₀ is the ground state energy. If L is the angular momentum of the electron in this orbit and h is the Planck’s constant, then 2πL/h is __________ :
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JEE Mains 202621 January Evening Shift
Open question & full solution → - MCQmediumGeometrical optics
As shown in the diagram, when the incident ray is parallel to base of the prism, the emergent ray grazes along the second surface.
If refractive index of the material of prism is √2, the angle θ of prism is.
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JEE Mains 202621 January Evening Shift
Open question & full solution → - MCQmediumCurrent electricity
Two known resistance of R Ω and 2R Ω and and one unknown resistance X Ω are connected in a circuit as shown in the figure. If the equivalent resistance between points A and B in the circuit is X Ω, then the value of X is ________ Ω.
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JEE Mains 202621 January Evening Shift
Open question & full solution → - NumericmediumPhotoelectric effect and dual nature of matter
A particle having electric charge 3 × 10⁻¹⁹ C and mass 6 × 10⁻²⁷ kg is accelerated by applying an electric potential of 1.21 V. Wavelength of the matter wave associated with the particle is α × 10⁻¹² m. The value of α is _________.
(Take Planck’s constant = 6.6 × 10⁻³⁴ J.s)
JEE Mains 202621 January Evening Shift
Open question & full solution → - NumericeasyThermodynamics
A diatomic gas (γ = 1.4) does 100 J of work when it is expanded isobarically. Then the heat given to the gas __________ J.
JEE Mains 202621 January Evening Shift
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