24 January 2023 physics questions with solutions

Showing 1–10 of 49 questions

• MCQmediumNewtons law of motion and Frictionsimple pulley problem

  As per given figure, a weightless pulley P is attached on a double inclined frictionless surface. The tension in the string (massless) will be (if g = 10 m/s²)

  

  Options

  • Option A

    (4√3 + 1) N

  • Option B

    4(√3 + 1) N

  • Option C

    4(√3 - 1) N

  • Option D

    (4√3 - 1) N

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  JEE Mains24 January 2023Shift 1Morning Shift

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• NumericmediumProperties of solid and fluidviscosity and terminal velocity

  A Spherical ball of radius 1mm and density 10.5 g/cc is dropped in glycerine of coefficient of viscosity 9.8 poise and density 1.5 g/cc. Viscous force on the ball when it attains constant velocity is 3696 × 10⁻ˣ N. The value of x is (Given, g = 9.8 m/s² and π = 22/7)

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  JEE Mains24 January 2023Shift 2Evening Shift

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• NumericmediumMagnetic effect of currentmagnetic force between current carring wire

  A single turn current loop in the shape of a right angle triangle with sides 5 cm, 12 cm, 13 cm is carrying a current of 2A. The loop is in a uniform magnetic field of magnitude 0.75 T whose direction is parallel to the current in the 13 cm side of the loop. The magnitude of the magnetic force on the 5 cm side will be x/130 N. The value of x is ___________.

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  JEE Mains24 January 2023Shift 2Evening Shift

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• A/ReasyProperties of solid and fluidpropertes of solid stress ,strain and modulus of elasticity

  Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.

  Assertion

  Steel is used in the construction of buildings and bridges.

  Reason

  Steel is more elastic and its elastic limit is high.

  Options

  • Option A

    Both A and R are correct but R is NOT the correct explanation of A

  • Option B

    A is not correct but R is correct

  • Option C

    Both A and R are correct and R is the correct explanation of A

  • Option D

    A is correct but R is not correct

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  JEE Mains24 January 2023Shift 2Evening Shift

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• MCQeasyNewtons law of motion and FrictionPseudo force related problem

  Given below are two statements : Statement-I : An elevator can go up or down with uniform speed when its weight is balanced with the tension of its cable. Statement-II : Force exerted by the floor of an elevator on the foot of a person standing on it is more than his/her weight when the elevator goes down with increasing speed. In the light of the above statements, choose the correct answer from the options given below :

  Options

  • Option A

    Both statement I and statement II are false

  • Option B

    Statement I is true but Statement II is false

  • Option C

    Both Statement I and Statement II are true

  • Option D

    Statement I is false but Statement II is true

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  JEE Mains24 January 2023Shift 1Morning Shift

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• MCQeasyGravitationacceleration due to gravity and escape velocity

  Given below are two statements:

  Statement I: Acceleration due to earth's gravity decreases as you go 'up' or 'down' from earth's surface.

  Statement II: Acceleration due to earth's gravity is same at a height 'h' and depth 'd' from earth's surface, if h = d. In the light of above statements, choose the most appropriate answer form the options given below

  Options

  • Option A

    Statement I is incorrect but statement II is correct

  • Option B

    Both Statement I and Statement II are incorrect

  • Option C

    Statement I is correct but statement II is incorrect

  • Option D

    Both Statement I and II are correct

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  JEE Mains24 January 2023Shift 2Evening Shift

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• NumericeasyThermodyanmicsthermal expansion solid and liquid

  A hole is drilled in a metal sheet. At 27°C, the diameter of hole is 5 cm. When the sheet is heated to 177°C, the change in the diameter of hole is d × 10⁻³ cm. The value of d will be _______ if coefficient of linear expansion of the metal is 1.6 × 10⁻⁵/°C.

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  JEE Mains24 January 2023Shift 1Morning Shift

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• MCQeasyPhotoelectric effect and dual nature of matterquestion based on photoelectric effect

  From the photoelectric effect experiment, following observations are made. Identify which of these are correct
  A. The stopping potential depends only on the work function of the metal.
  B. The saturation current increases as the intensity of incident light increases.
  C. The maximum kinetic energy of a photo electron depends on the intensity of the incident light.
  D. Photoelectric effect can be explained using wave theory of light. Choose the correct answer from the options given below:

  Options

  • Option A

    B, C only

  • Option B

    A, C, D only

  • Option C

    B only

  • Option D

    A, B, D only

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  JEE Mains24 January 2023Shift 1Morning Shift

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• MCQmediumMagnetic effect of currentbiot savart law and magnetic field due to straight conductor ,arc and ring

  A circular loop of radius r is carrying current I A. The ratio of magnetic field at the centre of circular loop and at a distance r from the center of the loop on its axis is :

  Options

  • Option A

    1 : 3√2

  • Option B

    3√2 : 2

  • Option C

    2√2 : 1

  • Option D

    1 : √2

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  JEE Mains24 January 2023Shift 1Morning Shift

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• NumericmediumElectromagnetic Inductionself induction and L-R circuit

  Three identical resistors with resistance R = 12Ω and two identical inductors with self inductance L=5 mH are connected to an ideal battery with emf of 12 V as shown in figure. The current through the battery long after the switch has been closed will be________A.

  

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  JEE Mains24 January 2023Shift 2Evening Shift

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