23 January Morning Shift physics questions with solutions

Showing 1–10 of 24 questions

• NumericmediumElectromagnetic waveDisplacement Current, Maxwell's Equations and Properties of Electromagnetic Waves

  The equation of the electric field of an electromagnetic wave propagating through free space is given by :

  E = √377 sin(6.27 × 10³t - 2.09 × 10⁻⁵x) N/C

  The average power of the electromagnetic wave is (1/α) W/m². The value of α is _______

  (Take √(μ₀/ε₀) = 377 in SI units)

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• MCQmediumCenter of maas , Momentum and CollisionLinear Momentum & Its Conservation

  A small both A of mass m is attached to a massless rigid rod of length 1m pivoted at point P and kept at an angle of 60° with vertical as shown in figure. At distance of 1m below point P, an identical bob B is kept at rest on a smooth horizontal surface that extends to a circular track of radius R as shown in figure. If bob B just manages to complete the circular path of radius R upto a point Q after being hit elastically by bob A, then radius R is ______m.

  

  Options

  • Option A

    3/5

  • Option B

    1/5

  • Option C

    (2 + √3)/5

  • Option D

    (2 - √3)/5

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• MCQmediumElectrostaticElectric Flux & Gauss’s Law

  Two point charges 2q and q are placed at vertex A and centre of face CDEF of the cube as shown in figure. The electric flux passing through the cube is :

  

  Options

  • Option A

    3q/ε₀

  • Option B

    q/ε₀

  • Option C

    3q/(2ε₀)

  • Option D

    3q/(4ε₀)

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• MCQmediumWork , Power and EnergyConservation of Mechanical Energy

  Two blocks with masses 100g and 200g are attached to the ends of springs A and B as shown in figure. The energy stored in A is E. The energy stored in B, when spring constants $k_{A}$, $k_{B}$ of A and B, respectively satisfy the relation 4$k_{A}$= 3$k_{B}$, is :

  

  Options

  • Option A

    4E

  • Option B

    2E

  • Option C

    3E

  • Option D

    4E/3

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• MCQeasyGeometrical opticsDispersion, Dispersive Power & Prism Combinations

  A thin prism with angle 5° of refractive index 1.72 is combined with another prism of refractive index 1.9 to produce dispersion without deviation. The angle of second prism is ______.

  Options

  • Option A

    4.5°

  • Option B

    6°

  • Option C

    4°

  • Option D

    5°

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• MCQeasyProperties of solid and fluidElastic Properties of Solids: Stress, Strain and Elastic Moduli

  The strain-stress plot for materials A,B,C and D is shown in the figure. Which material has the largest Young's modulus ?

  

  Options

  • Option A

    C

  • Option B

    D

  • Option C

    A

  • Option D

    B

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• MCQmediumElectromagnetic waveDisplacement Current, Maxwell's Equations and Properties of Electromagnetic Waves

  Match List-I with List-II.

  List-I (Relation)

  A. ∮$\vec{E}$·$\vec{dl}$ = -d/dt ∫$\vec{B}$·$\vec{da}$

  B. ∮$\vec{B}$·$\vec{dl}$ = μ₀[I + ε₀ dΦ(E)/dt]

  C. ∮$\vec{E}$·$\vec{da}$ = (1/ε₀)∫ρ dv

  D. ∮$\vec{B}$·$\vec{dl}$= μ₀I

  List-II (Law)

  I. Ampere's circuital law. II. Faraday's laws of electromagnetic induction. III. Ampere-Maxwell law IV. Gauss's law of electrostatics

  Choose the correct answer from the options given below :

  Options

  • Option A

    A-II, B-III, C-I, D-IV

  • Option B

    A-II, B-III, C-IV, D-I

  • Option C

    A-I, B-IV, C-III, D-II

  • Option D

    A-IV, B-I, C-II, D-III

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• MCQeasyUnits, Dimensions, Measurements and ErrorsErrors in Measurement and Error Propagation

  Four persons measure the length of a rod as 20.00 cm, 19.75 cm, 17.01 cm and 18.25 cm. The relative error in the measurement of average length of the rod is :

  Options

  • Option A

    0.24

  • Option B

    0.18

  • Option C

    0.06

  • Option D

    0.08

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• MCQmediumPhotoelectric effect and dual natureDual Nature of Matter & de Broglie Wavelength

  The de Broglie wavelength of an oxygen molecule at 27°C is x × 10⁻¹² m. The value of x is (take Planck's constant = 6.63 × 10⁻³⁴ J.s, Boltzmann constant = 1.38 × 10⁻²³ J/K, mass of oxygen. Molecule = 5.31 × 10⁻²⁶ kg).

  Options

  • Option A

    26

  • Option B

    24

  • Option C

    30

  • Option D

    20

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• MCQeasyUnits, Dimensions, Measurements and ErrorsVernier Calipers and Screw Gauge: Measurement and Errors

  In a screw gauge, the zero of the circular scale lies 3 divisions above the horizontal pitch line when their metallic studs are brought in contact. Using this instrument thickness of a sheet is measured. If pitch scale reading is 1 mm and the circular scale reading is 51 then the correct thickness of the sheet is ______ mm.

  [Assume least count is 0.01 mm]

  Options

  • Option A

    1.50

  • Option B

    1.48

  • Option C

    1.54

  • Option D

    1.51

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