11 April 2023 physics questions with solutions

Showing 1–10 of 58 questions

• MCQeasyCenter of maas , Momentum and Collisionmomentum and conservation of momentum

  An average force of 125 N is needed to hold a machine gun stationary while it fires 10 g bullets at 250 m s⁻¹. The number of bullets fired per second is:

  Options

  • Option A

    25

  • Option B

    5

  • Option C

    100

  • Option D

    50

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  JEE Mains11 April 2023Shift 1Morning Shift

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• MCQeasyCircular Motion

  An electron moves with constant velocity along the axis of a current-carrying straight solenoid. Which statements are correct? B: no magnetic force; C: it continues along the axis; other statements claim axial force/acceleration or parabolic motion.

  Options

  • Option A

    A and D only

  • Option B

    B, C and D only

  • Option C

    B and E only

  • Option D

    B and C only

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  JEE Mains11 April 2023Shift 2Evening Shift

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• MCQeasyGravitationlaw of gravitation ,gravitational field intensity ,gravitational potential and potential energy

  If V is the gravitational potential at the surface of a uniform solid sphere, the potential at its centre is:

  Options

  • Option A

    4V/3

  • Option B

    V

  • Option C

    3V/2

  • Option D

    V/2

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• IntegereasyCurrent electricityelectric instruments

  Two identical cells of emf 1.5 V each are connected in series across a 10 Ω resistor. An ideal voltmeter across the 10 Ω resistor reads 1.5 V. Find the internal resistance of each cell in Ω.

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• IntegermediumAtomic Structure and X-raysatomic structure and bohr atomic model

  Monochromatic light incident on ground-state hydrogen is absorbed and the atoms subsequently emit six different wavelengths. If the incident frequency is x × 10¹⁵ Hz and h = 4.25 × 10⁻¹⁵ eV s, find x.

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• MCQmediumCircular Motion

  The logic performed by the circuit shown is equivalent to: Image

  Options

  • Option A

    NAND

  • Option B

    NOR

  • Option C

    AND

  • Option D

    OR

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• MCQeasyKinematics part-2 Projectile MotionGround to ground projectile

  A projectile is projected at 30° with speed 40 m s⁻¹. Its velocity magnitude at t = 2 s is: (g = 10 m s⁻²)

  Options

  • Option A

    Zero

  • Option B

    20√3 m s⁻¹

  • Option C

    40√3 m s⁻¹

  • Option D

    20 m s⁻¹

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• MCQeasyCurrent electricitycombination of cells and maximum power theorem

  Two identical heater filaments are connected first in parallel and then in series. At the same applied voltage, the ratio of heat produced in the same time, parallel : series, is:

  Options

  • Option A

    1 : 2

  • Option B

    4 : 1

  • Option C

    1 : 4

  • Option D

    2 : 1

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• MCQeasyNuclear physicsradioactivity and law of decay

  Radioactive elements A and B initially have the same number of atoms. The half-life of A equals the mean life of B. If $\lambda_{A}$ and $\lambda_{B}$ are their decay constants, the correct relation is:

  Options

  • Option A

    $\lambda_{A}$= 2 $\lambda_{B}$

  • Option B

    $\lambda_{A}=\lambda_{B}$

  • Option C

    $\lambda_{A}=\lambda_{B}$ /ln2

  • Option D

    $\lambda_{A}=\lambda_{B}$ ln2

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• IntegereasyElectromagnetic Inductionmotional emf and induced emf in rotating rod

  A metallic cube of side 15 cm moves along +y at 2 m s⁻¹ in a uniform magnetic field 0.5 T along +z. The equilibrium potential difference between the higher- and lower-potential faces is ______ mV.

  

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