24 January Morning Shift physics questions with solutions

Showing 1–10 of 25 questions

• MCQmediumCurrent electricityElectrical Instruments: Galvanometer, Ammeter, Voltmeter & Potentiometer

  Two resistors 2 Ω and 3 Ω are connected in the gaps of bridge as shown in figure. The null point is obtained with the contact of jockey at some point on wire XY. When an unknown resistor is connected in parallel with 3 Ω resistor, the null point is shifted by 22.5 cm toward Y. The resistance of unknown resistor is____Ω.

  

  Options

  • Option A

    3

  • Option B

    2

  • Option C

    4

  • Option D

    1

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• NumericmediumMagnetism and mattermagnet in magnetic field, torque, potential energy, oscillation and magnetic moment

  A short bar magnet placed with its axis at 30° with an external field of 800 Gauss, experiences a torque of 0.016 N·m. The work done in moving it from most stable to most unstable position is α × 10⁻³ J. The value of α is _______.

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• MCQmediumGravitationGravitation, Gravitational Field & Potential Energy

  Three masses 200 kg, 300 kg and 400 kg are placed at the vertices of an equilateral triangle with sides 20 m. They are rearranged on the vertices of a bigger triangle of side 25 m and with the same centre. The work done in this process _________ J.

  (Gravitational constant G = 6.7 × 10⁻¹¹ N·m²/kg²)

  Options

  • Option A

    9.86 × 10⁻⁶

  • Option B

    2.85 × 10⁻⁷

  • Option C

    1.74 × 10⁻⁷

  • Option D

    4.77 × 10⁻⁷

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• MCQmediumRotational Motionrotational constrain motion

  Two masses 400 g and 350 g are suspended from the ends of a light string passing over a heavy pulley of radius 2 cm. When released from rest the heavier mass is observed to fall 81 cm in 9 s. The rotational inertia of the pulley is _______ kg·m².

  (g = 9.8 m/s²)

  Options

  • Option A

    9.5 × 10⁻³

  • Option B

    4.75 × 10⁻³

  • Option C

    1.86 × 10⁻²

  • Option D

    8.3 × 10⁻³

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• MCQmediumSimple Harmonic Motiontime period of linear shm

  A cylindrical block of mass M and area of cross section A is floating in a liquid of density ρ and with its axis vertical. When depressed a little and released the block starts oscillating. The period of oscillation is________.

  Options

  • Option A

    2π√[M/(ρAg)]

  • Option B

    π√[2M/(ρAg)]

  • Option C

    π√[ρA/(Mg)]

  • Option D

    2π√[ρA/(Mg)]

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• IntegermediumNewtons law of motion and Frictiontwo and more than two block problem in friction

  In the given figure the blocks A, B and C weigh 4 kg, 6 kg and 8 kg respectively. The co-efficient of sliding friction between any two surfaces is 0.5. The force F⃗ required to slide the block C with constant speed is ________ N.

  (Use g = 10 m/s²)

  

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• MCQmediumUnit dimension and errorDimension and its application

  Match the List-I with List-II

  List-I
  A. Magnetic induction
  B. Magnetic flux
  C. Magnetic permeability
  D. Self inductance

  List-II I. MLT⁻²A⁻² II. ML²T⁻²A⁻² III. ML⁰T⁻²A⁻¹ IV. ML²T⁻²A⁻¹

  Choose the correct answer from the options given below:

  Options

  • Option A

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

  • Option B

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

  • Option C

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

  • Option D

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

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• MCQeasyGeometrical opticsoptical instruments

  In a microscope of tube length 10 cm two convex lenses are arranged with focal length of 2 cm and 5 cm. Total magnification obtained with this system for normal adjustment is 5ᵏ. The value of k is_____

  Options

  • Option A

    2

  • Option B

    5

  • Option C

    3.5

  • Option D

    4

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• IntegereasyProperties of solid and fluidviscosity and terminal velocity

  Sixty four rain drops of radius 1 mm each falling down with a terminal velocity of 10 cm/s coalesce to form a bigger drop. The terminal velocity of bigger drop is ______ cm/s.

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• MCQmediumElectrostaticelectric flux and gauss law

  The electrostatic potential in a charged spherical region of radius r varies as V = ar³ + b, where a and b are constants. The total charge in the sphere of unit radius is α × πaε₀. The value of α is _____.

  (permittivity of vacuum is ε₀)

  Options

  • Option A

    -12

  • Option B

    -6

  • Option C

    -9

  • Option D

    -8

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