28 January Morning Shift physics questions with solutions

Showing 1–10 of 25 questions

• MCQmediumThermodynamicsHeat, Specific Heat Capacity, Latent Heat and Calorimetry

  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

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• MCQmediumProperties of solid and fluidElastic Properties of Solids: Stress, Strain and Elastic Moduli

  Two wires A and B made of different materials of length 6.0 cm and 5.4 cm, respectively and area of cross sections 3.0 × 10⁻⁵ m² and 4.5 × 10⁻⁵ m², respectively are stretched by the same magnitude under a given load. The ratio of the Young's modulus of A to that of B is x : 3. The value of x is ______.

  Options

  • Option A

    1

  • Option B

    4

  • Option C

    2

  • Option D

    5

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• MCQmediumNuclear physicsNuclear Properties, Mass Defect & Binding Energy

  An atom ⁸₃X is bombarded by shower of fundamental particles and in 10 s this atom absorbed 10 electrons, 10 protons and 9 neutrons. The percentage growth in the surface area of the nucleons is recorded by :

  Options

  • Option A

    250%

  • Option B

    150%

  • Option C

    225%

  • Option D

    900%

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• IntegermediumRotational MotionMoment of Inertia & Rotational Kinetic Energy

  A solid sphere of radius 10 cm is rotating about an axis which is at a distance 15 cm from its centre. The radius of gyration about this axis is √n cm. The value of n is ________.

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• 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

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• 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

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• MCQmediumUnits, Dimensions, Measurements and ErrorsVernier Calipers and Screw Gauge: Measurement and Errors

  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

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• MCQmediumRotational MotionPure Rotation About a 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

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• MCQmediumsemiconductorP–N Junction Diode & Forward–Reverse Bias

  Assuming in forward bias condition there is a voltage drop of 0.7 V across a silicon diode, the current through diode D₁ in the circuit is ______ mA. (Assume all diodes in the given circuit are identical)

  

  Options

  • Option A

    20.15

  • Option B

    11.7

  • Option C

    17.6

  • Option D

    18.8

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• NumericmediumCurrent electricityEquivalent Resistance & Networks

  The equivalent resistance between the points A and B in the following circuit is x/5 Ω. The value of x is ________.

  

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