28 January Morning Shift physics questions with solutions

Showing 1–10 of 25 questions

• NumericeasySimple Harmonic Motionkinetic and potential energy in shm

  The displacement of a particle, executing simple harmonic motion with time period T, is expressed as x(t) = A sin ωt, where A is the amplitude. The maximum value of potential energy of this oscillator is found at t = T/(2β). The value of β is ________.

  Your answer

  Check answerShow answer

  JEE Mains 202628 January Morning Shift

  Open question & full solution →
• IntegermediumGeometrical opticslens and combination lens,silvered lens

  A convex lens of refractive index 1.5 and focal length f = 18 cm is immersed in water. The difference in focal lengths of the given lens when it is in water and in air is α × f. The value of α is ________.

  (refractive index of water = 4/3)

  Your answer

  Check answerShow answer

  JEE Mains 202628 January Morning Shift

  Open question & full solution →
• MCQeasyThermodynamicsheat and principle of calorimeter

  Which of the following best represents the temperature versus heat supplied graph for water, in the range of -20°C to 120°C ?

  Options

  • Option A

    
  • Option B

    
  • Option C

    
  • Option D

    

  Check answerShow answer

  JEE Mains 202628 January Morning Shift

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

  Three long straight wires carrying current are arranged mutually parallel as shown in the figure. The force experienced by 15 cm length of wire Q is _____.

  (μ₀ = 4π × 10⁻⁷ T·m/A)

  

  Options

  • Option A

    6 × 10⁻⁷ N towards P

  • Option B

    6 × 10⁻⁶ N towards R

  • Option C

    6 × 10⁻⁷ N towards R

  • Option D

    6 × 10⁻⁶ N towards P

  Check answerShow answer

  JEE Mains 202628 January Morning Shift

  Open question & full solution →
• MCQmediumCurrent electricityCells, Maximum Power & Heating Effect

  For the two cells having same EMF E and internal resistance r, the current passing through the external resistor 6 Ω is same when both the cells are connected either in parallel or in series. The value of internal resistance r is _______ Ω.

  Options

  • Option A

    3

  • Option B

    4

  • Option C

    9

  • Option D

    6

  Check answerShow answer

  JEE Mains 202628 January Morning Shift

  Open question & full solution →
• MCQmediumGeometrical opticslens and combination lens,silvered lens

  The magnitudes of power of a biconvex lens (refractive index 1.5) and that of a plano-concave lens (refractive index = 1.7) are same. If the curvature of plano-concave lens exactly matches with the curvature of back surface of the biconvex lens, then ratio of radius of curvature of front and back surface of the biconvex lens is ______.

  Options

  • Option A

    5 : 2

  • Option B

    5 : 12

  • Option C

    12 : 5

  • Option D

    2 : 5

  Check answerShow answer

  JEE Mains 202628 January Morning Shift

  Open question & full solution →
• MCQmediumThermodynamicsheat and principle of calorimeter

  10 kg of ice at -10°C is added to 100 kg of water to lower its temperature from 25°C. Consider no heat exchange to surroundings. The decrement to the temperature of water is ________ °C.

  (specific heat of ice = 2100 J/kg·°C, specific heat of water = 4200 J/kg·°C, latent heat of fusion of ice = 3.36 × 10⁵ J/kg)

  Options

  • Option A

    10

  • Option B

    15

  • Option C

    6.67

  • Option D

    11.6

  Check answerShow answer

  JEE Mains 202628 January Morning Shift

  Open question & full solution →
• MCQmediumUnit dimension and errorvernier callipers and screw gauge

  When both jaws of vernier callipers touch each other, zero mark of the vernier scale is right to zero mark of main scale, 4th mark on vernier scale coincides with certain mark on the main scale. While measuring the length of a cylinder, observer observes 15 divisions on main scale and 5th division of vernier scale coincides with a min scale division. Measured length of cylinder is ______ mm. (Least count of Vernier calliper = 0.1 mm)

  Options

  • Option A

    15.4

  • Option B

    15.1

  • Option C

    15.5

  • Option D

    15.9

  Check answerShow answer

  JEE Mains 202628 January Morning Shift

  Open question & full solution →
• MCQmediumRotational Motionquestion based on pure rotation about fixed axis

  Two circular discs of radius each 10 cm are joined at their centres by a rod of length 30 cm and mass 600 gm as shown in figure. If the mass of each disc is 600 gm and applied torque between two discs is 43 × 10⁵ dyne cm, the angular acceleration of the discs about the given axis AB is ______ rad/s².

  

  Options

  • Option A

    22

  • Option B

    11

  • Option C

    100

  • Option D

    27

  Check answerShow answer

  JEE Mains 202628 January Morning Shift

  Open question & full solution →
• MCQeasyNewtons law of motion and Frictionfriction and single block problem

  A block of mass 5 kg is moving on an inclined plane which makes an angle of 30° with the horizontal. Friction coefficient between the block and inclined plane surface is √3/2. The force to be applied on the block so that the block will move down without acceleration is ______ N.

  Options

  • Option A

    25

  • Option B

    12.5

  • Option C

    7.5

  • Option D

    15

  Check answerShow answer

  JEE Mains 202628 January Morning Shift

  Open question & full solution →