28 January Evening Shift physics questions with solutions

Showing 1–10 of 25 questions

• MCQeasyCurrent electricitycircuit theory

  Which one of the following is not a measurable quantity ?

  Options

  • Option A

    Voltage difference

  • Option B

    Resistance

  • Option C

    Voltage

  • Option D

    Displacement current

  Check answerShow answer

  JEE Mains 202628 January Evening Shift

  Open question & full solution →
• MCQmediumElectromagnetic wavedisplacement current and properties of electromagnetic wave

  A plane electromagnetic wave is moving in free space with velocity c = 3 × 10⁸ m/s and its electric field is given as

  $\vec{E}$ = 54 sin(kz - ωt) ĵ V/m,

  where ĵ is the unit vector along y-axis. The magnetic field vector $\vec{B}$ of the wave is :

  Options

  • Option A

    -1.8 × 10⁻⁷ sin(kz - ωt) î T

  • Option B

    +1.4 × 10⁻⁷ sin(kz - ωt) k̂ T

  • Option C

    +1.4 × 10⁻⁷ sin(kz - ωt) î T

  • Option D

    +1.8 × 10⁻⁷ sin(kz - ωt) î T

  Check answerShow answer

  JEE Mains 202628 January Evening Shift

  Open question & full solution →
• MCQmediumElectrostaticselectric flux and gauss law

  Identify the correct statements :

  A. Electrostatic field lines form closed loops.

  B. The electric field lines point radially outward when charge is greater than zero.

  C. The Gauss-Law is valid only for inverse-square force.

  D. The workdone in moving a charged particle in a static electric field around a closed path is zero.

  E. The motion of a particle under Coulomb’s force must take place in a plane.

  Choose the correct answer from the options given below :

  Options

  • Option A

    A, B, D, E Only

  • Option B

    A, B, C, D Only

  • Option C

    B, C, D, E Only

  • Option D

    A, C, E Only

  Check answerShow answer

  JEE Mains 202628 January Evening Shift

  Open question & full solution →
• MCQmediumWave Motionsound wave and its general equation and velocity

  The speed of a longitudinal wave in a metallic bar is 400 m/s. If the density and Young's modulus of the bar material are increased by 0.5% and 1% respectively then the speed of the wave is changed approximately to _____ m/s.

  Options

  • Option A

    399

  • Option B

    398

  • Option C

    402

  • Option D

    401

  Check answerShow answer

  JEE Mains 202628 January Evening Shift

  Open question & full solution →
• MCQmediumCurrent electricitycircuit theory

  A Wheatstone bridge is initially at room temperature and all arms of the bridge have same value of resistances (R₁ = R₂ = R₃ = R₄). When R₃ resistance is heated to some temperature, its resistance value has gone up by 10%. The potential difference V(A) - V(B), after R₃ is heated, is _____ V.

  

  Options

  • Option A

    1.05

  • Option B

    0

  • Option C

    0.95

  • Option D

    2

  Check answerShow answer

  JEE Mains 202628 January Evening Shift

  Open question & full solution →
• MCQmediumRotational Motionangular momentum in pure rotation and its conservation

  When the position vector. $\vec{r}$ = xî + yĵ + zk̂ changes sign as -$\vec{r}$, which one of the following vector will not flip under sign change ?

  Options

  • Option A

    Linear momentum

  • Option B

    Velocity

  • Option C

    Acceleration

  • Option D

    Angular momentum

  Check answerShow answer

  JEE Mains 202628 January Evening Shift

  Open question & full solution →
• MCQeasyNuclear physicsNucles and its density radius and mass defect ,binding energy and its curve

  A nucleus has mass number α and radius $R_{\alpha}$. Another nucleus has mass number β and radius $R_{\beta}$. If β = 8α, then $\frac{R_{\alpha}}{R_{\beta}}$ is :

  Options

  • Option A

    2

  • Option B

    8

  • Option C

    1

  • Option D

    0.5

  Check answerShow answer

  JEE Mains 202628 January Evening Shift

  Open question & full solution →
• MCQmediumKinematics Part-1 (one dimension)Acceleration and Avg acceleration

  A particle starts moving from time t = 0 and its coordinate is given as

  x(t) = 4t³ - 3t.

  A. The particle returns to its original position (origin) 0.866 units later.

  B. The particle is 1 unit away from origin at its turning point.

  C. Acceleration of the particle is non-negative.

  D. The particle is 0.5 units away from origin at its turning point.

  E. Particle never turns back as acceleration is non-negative.

  Choose the correct answer from the options given below :

  Options

  • Option A

    A, C, D only

  • Option B

    A, B, C only

  • Option C

    C, E only

  • Option D

    A, C only

  Check answerShow answer

  JEE Mains 202628 January Evening Shift

  Open question & full solution →
• MCQeasysemiconductorapplication of diode and zener breakdown

  Two p-n junction diodes D₁ and D₂ are connected as shown in figure. A and B are input signals and C is the output. The given circuit will function as a ____.

  

  Options

  • Option A

    OR Gate

  • Option B

    NOR Gate

  • Option C

    NAND Gate

  • Option D

    AND Gate

  Check answerShow answer

  JEE Mains 202628 January Evening Shift

  Open question & full solution →
• MCQmediumGeometrical opticsprism and thin prism

  For a transparent prism, if the angle of minimum deviation is equal to its refracting angle, the refractive index n of the prism satisfies.

  Options

  • Option A

    √2 < n < 2√2

  • Option B

    1 < n < 2

  • Option C

    n ≥ 2

  • Option D

    √2 < n < 2

  Check answerShow answer

  JEE Mains 202628 January Evening Shift

  Open question & full solution →