23 January Morning Shift physics questions with solutions

Showing 1–10 of 24 questions

• NumericmediumElectromagnetic wavedisplacement current and properties of electromagnetic wave

  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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• MCQmediumThermodynamicsheat and principle of calorimeter

  In a perfectly inelastic collision, two spheres made of the same material with masses 15 kg and 25 kg, moving in opposite directions with speeds of 10 m/s and 30 m/s, respectively, strike each other and stick together. The rise in temperature (in °C), if all the heat produced during the collision is retained by these spheres, is :

  (specific heat of sphere material 31 cal/kg. °C and 1 cal = 4.2 J)

  Options

  • Option A

    1.75

  • Option B

    1.44

  • Option C

    1.15

  • Option D

    1.95

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• NumericmediumElectromagnetic Inductionmotional emf and induced emf in rotating rod

  A simple pendulum made of mass 10 g and a metallic wire of length 10 cm is suspended vertically in a uniform magnetic field of 2 T. The magnetic field direction is perpendicular to the plane of oscillations of the pendulum. If the pendulum is released from an angle of 60° with vertical, then maximum induced EMF between the point of suspension and point of oscillation is ________ mV. (Take g = 10 m/s²)

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• MCQmediumRotational Motionangular momentum in pure rotation and its conservation

  Two small balls with masses m and 2m are attached to both ends of a rigid rod of length d and negligible mass. If angular momentum of this system is L about an axis (A) passing through its centre of mass and perpendicular to the rod then angular velocity of the system about A is :

  Options

  • Option A

    3L/(2md²)

  • Option B

    2L/md²

  • Option C

    4L/(3md²)

  • Option D

    2L/(5md²)

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• NumericeasyWave Opticsyoung's dubble slit experiments

  In two separate Young’s double-slit experimental set-ups, two monochromatic light sources of different wavelengths are used to get fringes of equal width. The ratios of the slit separations and that of the wavelengths of light used are 2 : 1 and 1 : 2 respectively. The corresponding ratio of the distances between the slits and the respective screens (D₁ / D₂) is ________.

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• MCQeasyProperties of solid and fluidpropertes of solid stress ,strain and modulus of elasticity

  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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• MCQmediumAtomic Structure and X-raysatomic structre and bohr atomic model

  In hydrogen atom spectrum, (R → Rydberg's constant)

  A. the maximum wavelength of the radiation of Lyman series is 4/(3R)

  B. the Balmer series lies in the visible region of the spectrum

  C. the minimum wavelength of the radiation of Paschen series is 9/R

  D. the minimum wavelength of Lyman series is 5/(4R)

  Choose the correct answer from the options given below :

  Options

  • Option A

    B, D Only

  • Option B

    A, B and C Only

  • Option C

    A, B and D Only

  • Option D

    A, B Only

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• MCQmediumWork , Power and EnergySpring Energy and Conservation of 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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• NumericeasyAC Circuitsseries combination of ac circuit and L-C-R circuit

  Using a variable-frequency a.c. voltage source, the maximum current measured in the given LCR circuit is 50 mA for V=5sin(100t). The values of L and R are shown in the figure. The capacitance of the capacitor (C) used is ________ μF.

  

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• MCQeasyWork , Power and Energykinetic enegy and work engery theorem

  An object is projected with kinetic energy K from a point A at an angle 60° with the horizontal. The ratio of the difference in kinetic energies points B and C to that at point A (see figure), in the absence of air friction is :

  

  Options

  • Option A

    1 : 2

  • Option B

    2 : 3

  • Option C

    1 : 4

  • Option D

    3 : 4

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