24 January 2023 physics questions with solutions

Showing 1–10 of 49 questions

• NumericeasyCurrent electricityElectric Current, Drift Velocity & Resistance

  If a copper wire is stretched to increase its length by 20%. The percentage increase in resistance of the wire is __________ %.

  Your answer

  Check answerShow answer

  JEE Mains24 January 2023Shift 2Evening Shift

  Open question & full solution →
• MCQmediumCircular MotionCentripetal & Centrifugal Forces

  A body of mass 200g is tied to a spring of spring constant 12.5 N/m, while the other end of spring is fixed at point O. If the body moves about O in a circular path on a smooth horizontal surface with constant angular speed 5 rad/s, then the ratio of extension in the spring to its natural length will be :

  Options

  • Option A

    1:2

  • Option B

    1:1

  • Option C

    2:3

  • Option D

    2:5

  Check answerShow answer

  JEE Mains24 January 2023Shift 2Evening Shift

  Open question & full solution →
• A/ReasyGravitationAcceleration Due to Gravity & Escape Velocity

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

  Assertion

  A pendulum clock when taken to Mount Everest becomes fast.

  Reason

  The value of g (acceleration due to gravity) is less at Mount Everest than its value on the surface of earth.

  Options

  • Option A

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

  • Option B

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

  • Option C

    A is not correct but R is correct

  • Option D

    A is correct but R is not correct

  Check answerShow answer

  JEE Mains24 January 2023Shift 2Evening Shift

  Open question & full solution →
• MCQeasyNewtons law of motion and FrictionPseudo Force & Non-Inertial Frames

  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

  Check answerShow answer

  JEE Mains24 January 2023Shift 1Morning Shift

  Open question & full solution →
• NumericeasySimple Harmonic MotionTime Period of Linear Simple Harmonic Motion

  A mass m attached to free end of a spring executes SHM with a period of 1s. If the mass is increased by 3 kg the period of oscillation increases by one second, the value of mass m is ________ kg.

  Your answer

  Check answerShow answer

  JEE Mains24 January 2023Shift 2Evening Shift

  Open question & full solution →
• MCQmediumCurrent electricityElectrical Instruments: Galvanometer, Ammeter, Voltmeter & Potentiometer

  A cell of emf 90 V is connected across series combination of two resistors each of 100Ω resistance. A voltmeter of resistance 400Ω is used to measure the potential difference across each resistor. The reading of the voltmeter will be :

  Options

  • Option A

    40 V

  • Option B

    45 V

  • Option C

    80 V

  • Option D

    90 V

  Check answerShow answer

  JEE Mains24 January 2023Shift 2Evening Shift

  Open question & full solution →
• MCQeasyKinematics part-2 Projectile MotionMotion in 2-D and ground to ground projectile

  The maximum vertical height to which a man can throw a ball is 136 m. The maximum horizontal distance upto which he can throw the same ball is

  Options

  • Option A

    192 m

  • Option B

    136 m

  • Option C

    272 m

  • Option D

    68 m

  Check answerShow answer

  JEE Mains24 January 2023Shift 1Morning Shift

  Open question & full solution →
• A/ReasysemiconductorDiode Applications & Zener Breakdown

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

  Assertion

  Photodiodes are preferably operated in reverse bias condition for light intensity measurement.

  Reason

  The current in the forward bias is more than the current in the reverse bias for a p – n junction diode.

  Options

  • Option A

    A is false but R is true

  • Option B

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

  • Option C

    A is true but R is false

  • Option D

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

  Check answerShow answer

  JEE Mains24 January 2023Shift 1Morning Shift

  Open question & full solution →
• NumericmediumGeometrical opticsLenses, Lens Combinations & Silvered Lenses

  As shown in the figure, a combination of a thin plano concave lens and a thin plano convex lens is used to image an object placed at infinity. The radius of curvature of both the lenses is 30 cm and refraction index of the material for both the lenses is 1.75. Both the lenses are placed at distance of 40 cm from each other. Due to the combination, the image of the object is formed at distance x = _______ cm, from concave lens.

  

  Your answer

  Check answerShow answer

  JEE Mains24 January 2023Shift 1Morning Shift

  Open question & full solution →
• NumericmediumMagnetic effect of currentMagnetic Force on Current carrying conductor

  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 ___________.

  Your answer

  Check answerShow answer

  JEE Mains24 January 2023Shift 2Evening Shift

  Open question & full solution →