JEE Mains 2022 physics questions with solutions

Showing 1–10 of 33 questions

• MCQmediumAtomic Structure and X-rays

  In Bohr's atomic model of hydrogen, let K, P and E are the kinetic energy, potential energy and total energy of the electron respectively. Choose the correct option when the electron undergoes transitions to a higher level :

  Options

  • Option A

    All K, P and E increase

  • Option B

    K decreases, P and E increase

  • Option C

    P decreases, K and E increase

  • Option D

    K increases, P and E decrease

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• MCQmediumGeometrical opticslens and combination lens,silvered lens

  Two identical thin biconvex lenses of focal length 15 cm and refractive index 1.5 are in contact with each other. The space between the lenses is filled with a liquid of refractive index 1.25. The focal length of the combination is _________cm.

  Options

  • Option A

    11

  • Option B

    9

  • Option C

    10

  • Option D

    20

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

  Two identical cells each of emf 1.5 V are connected in parallel across a parallel combination of two resistors each of resistance 20Ω. A voltmeter connected in the circuit measures 1.2V. The internal resistance of each cell is

  Options

  • Option A

    2.5Ω

  • Option B

    4Ω

  • Option C

    5Ω

  • Option D

    10Ω

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• MCQmediumWork , Power and Energykinetic enegy and work engery theorem

  A particle experiences $\vec{F}$=(4x î+3y² ĵ) N in the xy-plane. If it moves from (1,2) to (2,3), the change in kinetic energy is:

  Options

  • Option A

    50.0 J

  • Option B

    12.5 J

  • Option C

    25.0 J

  • Option D

    0 J

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• MCQmediumPhotoelectric effect and dual nature of matter

  The light of two different frequencies whose photons have energies 3.8 eV and 1.4 eV respectively, illuminate a metallic surface whose work function is 0.6 eV successively. The ratio of maximum speeds of emitted electrons for the two frequencies respectively will be:

  Options

  • Option A

    1 : 1

  • Option B

    2 : 1

  • Option C

    4 : 1

  • Option D

    1 : 4

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• MCQmediumKinematics part-2 Projectile MotionMotion in 2-D and ground to ground projectile

  A projectile is projected with velocity of 25 m/s at an angle θ with the horizontal. After t seconds its inclination with horizontal becomes zero. If R represents horizontal range of the projectile, the value of θ will be [use g = 10 m/s²]

  Options

  • Option A

    ½ sin⁻¹(5t²/(4R))

  • Option B

    ½ sin⁻¹(4R²/(5t²))

  • Option C

    tan⁻¹(4t²/(5R))

  • Option D

    cot⁻¹(R/(20t²))

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• MCQeasyWave Motion

  Sound travels in a mixture of two moles of helium and n moles of hydrogen. If rms speed of gas molecules in the mixture is √2 times the speed of sound, then the value of n will be

  Options

  • Option A

    1

  • Option B

    2

  • Option C

    3

  • Option D

    4

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• MCQmediumCircular Motioncentripital force and centrifugal force

  A 100 g stone tied to a 2 m string is whirled in a horizontal circle. The string can withstand 80 N. If the maximum speed is (K/π) rev/min, find K.

  Options

  • Option A

    400

  • Option B

    300

  • Option C

    600

  • Option D

    800

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• MCQmediumProperties of solid and fluid

  The bulk modulus of a liquid is 3 ×10¹⁰ N m⁻². The pressure required to reduce the volume of liquid by 2% is :

  Options

  • Option A

    3 ×10⁸ N m⁻²

  • Option B

    9 ×10⁸ N m⁻²

  • Option C

    6 ×10⁸ N m⁻²

  • Option D

    12 ×10⁸ N m⁻²

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• NumericmediumWork , Power and Energyconservation of mechanical energy

  A 100 g ball is dropped from height h=10 cm onto a platform attached to a vertical spring. The ball sticks and the platform is depressed by h/2. Find the spring constant in N/m. (g=10 m/s²)

  

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