21 January Evening Shift physics questions with solutions

Showing 1–10 of 25 questions

• MCQeasyWave OpticsYoung's Double Slit Experiment

  Given below are two statements:

  Statement I : In a Young’s double slit experiment, the angular separation of fringes will increase as the screen is moved away from the plane of the slits

  Statement II : In a Young’s double slit experiment, the angular separation of fringes will increase when monochromatic source is replaced by another monochromatic source of higher wavelength

  In the light of the above statements, choose the correct answer from the options given below:

  Options

  • Option A

    Both Statement I and Statement II are true

  • Option B

    Both Statement I and Statement II are false

  • Option C

    Statement I is false but Statement II is true

  • Option D

    Statement I is true but Statement II is false

  Check answerShow answer

  JEE Mains 202621 January Evening Shift

  Open question & full solution →
• MCQeasyUnit dimension and errorsignificant number

  Keeping the significant figures in view, the sum of the physical quantities 52.01m, 153.2 m and 0.123 m is :

  Options

  • Option A

    205 m

  • Option B

    205.333 m

  • Option C

    205.33 m

  • Option D

    205.3 m

  Check answerShow answer

  JEE Mains 202621 January Evening Shift

  Open question & full solution →
• MCQmediumElectromagnetic InductionMutual induction and L-C oscillations,transformer

  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.

  Options

  • Option A

    π√(LC)/3

  • Option B

    π√(LC)/6

  • Option C

    π√(LC)/2

  • Option D

    π√(LC/2)

  Check answerShow answer

  JEE Mains 202621 January Evening Shift

  Open question & full solution →
• MCQmediumRotational Motionrotational constrain 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.)

  

  Options

  • Option A

    (M - m)g/[(13/6)M + m]

  • Option B

    (M - m)g/(M + m)

  • Option C

    (M - m)g/[(8/3)M + m]

  • Option D

    (M - m)g/(2M + m)

  Check answerShow answer

  JEE Mains 202621 January Evening Shift

  Open question & full solution →
• MCQmediumProperties of solid and fluidviscosity and terminal velocity

  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)

  Options

  • Option A

    2Δr/r - Δv₀/v₀

  • Option B

    2Δr/r + Δv₀/v₀

  • Option C

    2[Δr/r + Δv₀/v₀]

  • Option D

    2[Δr/r - Δv₀/v₀]

  Check answerShow answer

  JEE Mains 202621 January Evening Shift

  Open question & full solution →
• NumericeasyProperties of solid and fluidviscosity and terminal velocity

  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.

  Your answer

  Check answerShow answer

  JEE Mains 202621 January Evening Shift

  Open question & full solution →
• MCQeasyWork , Power and Energyquestion based on work

  A body of mass 2 kg is moving along x-direction such that its displacement as function of time is given by x(t) = αt² + βt + γm, where α = 1 m/s², β = 1 m/s and γ = 1m. The work done on the body during the time interval t = 2 s to t = 3 s, is ________ J.

  Options

  • Option A

    49

  • Option B

    42

  • Option C

    24

  • Option D

    12

  Check answerShow answer

  JEE Mains 202621 January Evening Shift

  Open question & full solution →
• NumericeasyThermodyanmicsfirst law of thermodynamics

  A diatomic gas (γ = 1.4) does 100 J of work when it is expanded isobarically. Then the heat given to the gas __________ J.

  Your answer

  Check answerShow answer

  JEE Mains 202621 January Evening Shift

  Open question & full solution →
• NumericmediumElectromagnetic wavedisplacement current and properties of electromagnetic wave

  An electromagnetic wave of frequency 100 MHz propagates through a medium of conductivity, σ = 10 mho/m. The ratio of maximum conducting current density to maximum displacement current density is _________.

  [Take 1/(4πε₀) = 9 × 10⁹ Nm²/C²]

  Your answer

  Check answerShow answer

  JEE Mains 202621 January Evening Shift

  Open question & full solution →
• NumericmediumPhotoelectric effect and dual nature of matterdebroglie duel nature of light

  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)

  Your answer

  Check answerShow answer

  JEE Mains 202621 January Evening Shift

  Open question & full solution →