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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
- MCQmediumProperties of solid and fluid
A spherical body of radius r and density σ falls freely through a viscous liquid having density ρ and viscosity η and attains a terminal velocity v₀. Estimated maximum error in the quantity η is :
(Ignore errors associated with σ, ρ and g, gravitational acceleration)
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JEE Mains 202621 January Evening Shift
Open question & full solution → - MCQmediumElectrostatic
Consider two identical metallic spheres of radius R each having charge Q and mass m. Their centers have an initial separation of 4R. Both the spheres are given an initial speed of u towards each other. The minimum value of u, so that they can just touch each other is :
(Take k = 1/(4πε₀) and assume kQ² > Gm² where G is the Gravitational constant)
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JEE Mains 202621 January Evening Shift
Open question & full solution → - MCQmediumProperties of solid and fluid
Surface tension of two liquids (having same densities), T₁ and T₂, are measured using capillary rise method utilizing two tubes with inner radii of r₁ and r₂ where r₁ > r₂. The measured liquid heights in these tubes are h₁ and h₂ respectively. [Ignore the weight of the liquid about the lowest point of miniscus]. The heights h₁ and h₂ and surface tensions T₁ and T₂ satisfy the relation :
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JEE Mains 202621 January Evening Shift
Open question & full solution → - NumericmediumPhotoelectric effect and dual nature
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 → - MCQmediumCurrent electricity
The total length of potentiometer wire AB is 50 cm in the arrangement as shown in figure. If P is the point where the galvanometer shows zero reading then the length AP is ………. cm.
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JEE Mains 202621 January Evening Shift
Open question & full solution → - 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 → - MCQmediumElectromagnetic Induction
A capacitor C is first charged fully with potential difference of V₀ and disconnected from the battery. The charged capacitor is connected across an inductor having inductance L. In t s 25% of the initial energy in the capacitor is transferred to the inductor. The value of t is_______s.
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JEE Mains 202621 January Evening Shift
Open question & full solution → - MCQmediumMagnetic effect of current
An infinitely long straight wire carrying current I is bent in a planer shape as shown in the diagram. The radius of the circular part is r. The magnetic field at the centre O of the circular loop is :
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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
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
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