29 January 2023 physics questions with solutions

Showing 1–10 of 58 questions

• MCQmediumUnit dimension and errorDimension and its application

  The equation of a circle is x² + y² = a², where a is the radius. If the equation is modified to change the origin other than (0,0), then find out the correct dimensions of A and B in the new equation: (x - At)² + (y - t/B)² = a². The dimensions of t are given as [T⁻¹].

  Options

  • Option A

    A = [L⁻¹T], B = [LT⁻¹]

  • Option B

    A = [LT], B = [L⁻¹T⁻¹]

  • Option C

    A = [L⁻¹T⁻¹], B = [LT⁻¹]

  • Option D

    A = [L⁻¹T⁻¹], B = [LT]

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  JEE Mains29 January 2023Shift 2Evening Shift

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• MCQmediumCircular Motionkinematics of circular motion

  An object moves at a constant speed along a circular path in a horizontal plane with centre at the origin. When the object is at x = +2 m, its velocity is -4ĵ m s⁻¹. The object’s velocity v and acceleration a at x = -2 m will be:

  Options

  • Option A

    v = 4î m s⁻¹, a = 8ĵ m s⁻²

  • Option B

    v = 4ĵ m s⁻¹, a = 8î m s⁻²

  • Option C

    v = -4ĵ m s⁻¹, a = 8î m s⁻²

  • Option D

    v = -4î m s⁻¹, a = -8ĵ m s⁻²

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• NumericmediumRotational Motionangular momentum in pure rotation and its conservation

  A particle of mass 100 g is projected at time t = 0 with a speed 20 m s⁻¹ at an angle 45° to the horizontal as given in the figure. The magnitude of the angular momentum of the particle about the starting point at time t = 2 s is found to be √K kg m² s⁻¹. The value of K is ________. [Take g = 10 m s⁻²]

  

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  JEE Mains29 January 2023Shift 2Evening Shift

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• MCQmediumElectromagnetic Inductionfaradays law and question based on it

  A square loop of area 25 cm² has a resistance of 10 Ω. The loop is placed in uniform magnetic field of magnitude 40.0 T. The plane of loop is perpendicular to the magnetic field. The work done in pulling the loop out of the magnetic field slowly and uniformly in 1.0 s will be:

  Options

  • Option A

    2.5 × 10⁻³ J

  • Option B

    1.0 × 10⁻³ J

  • Option C

    1.0 × 10⁻⁴ J

  • Option D

    5 × 10⁻³ J

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• NumericeasySimple Harmonic Motionkinetic and potential energy in shm

  A particle of mass 250 g executes a simple harmonic motion under a periodic force F = (-25x) N. The particle attains a maximum speed of 4 m/s during its oscillation. The amplitude of the motion is ______ cm.

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• MCQmediumThermodynamicskinetic therory of gaseous

  At 300 K, the rms speed of oxygen molecules is √[(α + 5)/α] times its average speed in the gas. Then, the value of α will be: [Use π = 22/7]

  Options

  • Option A

    32

  • Option B

    28

  • Option C

    24

  • Option D

    27

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• MCQeasyNewtons law of motion and Frictionfriction and single block problem

  A block of mass m slides down the plane inclined at angle 30° with an acceleration g/4. The value of coefficient of kinetic friction will be:

  Options

  • Option A

    (2√3 + 1)/2

  • Option B

    1/(2√3)

  • Option C

    √3/2

  • Option D

    (2√3 - 1)/2

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  JEE Mains29 January 2023Shift 1Morning Shift

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• NumericmediumWave Opticspolarisation

  As shown in figures, three identical polaroids P₁, P₂ and P₃ are placed one after another. The pass axis of P₂ and P₃ are inclined at angle of 60° and 90° with respect to axis of P₁. The source S has an intensity of 256 W m⁻². The intensity of light at point O is ____ W m⁻².

  

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• MCQeasyWork , Power and Energykinetic enegy and work engery theorem

  A stone is projected at angle 30° to the horizontal. The ratio of kinetic energy of the stone at point of projection to its kinetic energy at the highest point of flight will be:

  Options

  • Option A

    1 : 2

  • Option B

    1 : 4

  • Option C

    4 : 1

  • Option D

    4 : 3

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• NumericeasyWave Motionreflaction ,refraction of string wave and superposition of wave

  Two simple harmonic waves having equal amplitudes of 8 cm and equal frequency of 10 Hz are moving along the same direction. The resultant amplitude is also 8 cm. The phase difference between the individual waves is _____ degree.

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