28 January Morning Shift physics questions with solutions

Showing 1–10 of 25 questions

• MCQmediumNewtons law of motion and Frictionnewton second law and problem based on it

  A particle of mass m falls from rest through a resistive medium having resistive force, F = -kv, where v is the velocity of the particle and k is a constant. Which of the following graphs represents velocity (v) versus time (t) ?

  Options

  • Option A

    
  • Option B

    
  • Option C

    
  • Option D

    

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• MCQmediumUnit dimension and errorvernier callipers and screw gauge

  When both jaws of vernier callipers touch each other, zero mark of the vernier scale is right to zero mark of main scale, 4th mark on vernier scale coincides with certain mark on the main scale. While measuring the length of a cylinder, observer observes 15 divisions on main scale and 5th division of vernier scale coincides with a min scale division. Measured length of cylinder is ______ mm. (Least count of Vernier calliper = 0.1 mm)

  Options

  • Option A

    15.4

  • Option B

    15.1

  • Option C

    15.5

  • Option D

    15.9

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• MCQeasyElectrostaticspotential energy and electric potential

  Two point charges of 1 nC and 2 nC are placed at the two corners of equilateral triangle of side 3 cm. The work done in bringing a charge of 3 nC from infinity to the third corner of the triangle is ______ μJ.

  1/(4πε₀) = 9 × 10⁹ N·m²/C²

  Options

  • Option A

    2.7

  • Option B

    5.4

  • Option C

    3.3

  • Option D

    27

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• MCQmediumMagnetic effect of currentmagnetic force between current carring wire

  Three long straight wires carrying current are arranged mutually parallel as shown in the figure. The force experienced by 15 cm length of wire Q is _____.

  (μ₀ = 4π × 10⁻⁷ T·m/A)

  

  Options

  • Option A

    6 × 10⁻⁷ N towards P

  • Option B

    6 × 10⁻⁶ N towards R

  • Option C

    6 × 10⁻⁷ N towards R

  • Option D

    6 × 10⁻⁶ N towards P

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• MCQeasyGeometrical opticslaw of refraction and total internal reflection

  The electric field of an electromagnetic wave travelling through a medium is given by

  $\vec{E}$(x,t) = 25 sin(2.0 × 10¹⁵t - 10⁷x) n̂

  then the refractive index of the medium is ______.

  (All given measurements are in SI units)

  Options

  • Option A

    1.2

  • Option B

    2

  • Option C

    1.5

  • Option D

    1.7

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

  Two wires A and B made of different materials of length 6.0 cm and 5.4 cm, respectively and area of cross sections 3.0 × 10⁻⁵ m² and 4.5 × 10⁻⁵ m², respectively are stretched by the same magnitude under a given load. The ratio of the Young's modulus of A to that of B is x : 3. The value of x is ______.

  Options

  • Option A

    1

  • Option B

    4

  • Option C

    2

  • Option D

    5

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• MCQmediumRotational Motionquestion based on pure rotation about fixed axis

  Two circular discs of radius each 10 cm are joined at their centres by a rod of length 30 cm and mass 600 gm as shown in figure. If the mass of each disc is 600 gm and applied torque between two discs is 43 × 10⁵ dyne cm, the angular acceleration of the discs about the given axis AB is ______ rad/s².

  

  Options

  • Option A

    22

  • Option B

    11

  • Option C

    100

  • Option D

    27

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• MCQmediumThermodyanmicsthermodynmic process and work done

  In the following p-V diagram the equation of state along the curved path is given by (V - 2)² = 4ap where a is a constant. The total work done in the closed path is

  

  Options

  • Option A

    -1/a

  • Option B

    +1/(3a)

  • Option C

    1/(2a)

  • Option D

    -1/(3a)

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• MCQmediumCurrent electricityelectric instruments

  In the potentiometer, when the cell in the secondary circuit is shunted with 4 Ω resistance, the balance is obtained at the length 120 cm of wire. Now when the same cell is shunted with 12 Ω resistance, the balance is shifted to a length of 180 cm. The internal resistance of cell is ___ Ω.

  Options

  • Option A

    3

  • Option B

    4

  • Option C

    12

  • Option D

    6

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• MCQeasyAc Cirucuitsavg value and rms value of ac

  The electric current in the circuit is given as i = i₀(t/T). The r.m.s current for the period t = 0 to t = T is ________.

  Options

  • Option A

    i₀/√2

  • Option B

    i₀

  • Option C

    i₀/√6

  • Option D

    i₀/√3

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