1st Feb Evening Shit 2023 physics questions with solutions

Showing 1–10 of 13 questions

• MCQmediumsemiconductorapplication of diode and zener breakdown

  Choose the correct statement about a Zener diode.

  Options

  • Option A

    It works as a voltage regulator in reverse bias and behaves like a simple p-n junction diode in forward bias.

  • Option B

    It works as a voltage regulator in both forward and reverse bias.

  • Option C

    It works as a voltage regulator only in forward bias.

  • Option D

    It works as a voltage regulator in forward bias and behaves like a simple p-n junction diode in reverse bias.

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• MCQmediumThermodynamicsthermodynmic process and work done

  For three low-density gases A, B and C, pressure versus temperature (°C) graphs at constant volume meet the temperature axis at point K. The temperature at K is:

  

  Options

  • Option A

    -273°C

  • Option B

    -100°C

  • Option C

    -373°C

  • Option D

    -40°C

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• MCQmediumSimple Harmonic Motionangular shm and its time period

  Choose the correct graph of T² versus L for a simple pendulum executing SHM. Image

  Options

  • Option A

    
  • Option B

    
  • Option C

    
  • Option D

    

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• IntegermediumNuclear physicsNucles and its density radius and mass defect ,binding energy and its curve

  Nucleus A has Z = 17 and equal numbers of protons and neutrons. Its binding energy per nucleon is 1.2 MeV. Nucleus B has Z = 12, total nucleons 26 and binding energy per nucleon 1.8 MeV. Find the difference between the total binding energy of B and A, in MeV.

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• IntegermediumRotational Motionmoment of inertia and kinetic energy in pure rotation

  The moment of inertia of a disc of mass M and radius R about any diameter is MR²/4. Its moment of inertia about an axis normal to the disc and passing through a point on its edge is (x/2)MR². Find x.

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• MCQmediumElectromagnetic wavedisplacement current and properties of electromagnetic wave

  The ratio of average electric energy density to total average energy density of an electromagnetic wave is:

  Options

  • Option A

    2

  • Option B

    1

  • Option C

    3

  • Option D

    1/2

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• MCQmediumProperties of solid and fluidpropertes of solid stress ,strain and modulus of elasticity

  A steel wire has length 6 m, cross-sectional area 3 mm² and Young's modulus 2 × 10¹¹ N m⁻². A 4 kg block is attached to its free end on a planet where g is one-fourth of Earth's value. Take gₑ = 10 m s⁻². The elongation is:

  Options

  • Option A

    1 cm

  • Option B

    1 mm

  • Option C

    0.1 mm

  • Option D

    0.1 cm

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• MCQmediumGeometrical opticsspherical mirror

  Two objects A and B are placed 15 cm and 25 cm from the pole of a concave mirror of radius of curvature 40 cm. The distance between their images is:

  Options

  • Option A

    40 cm

  • Option B

    60 cm

  • Option C

    160 cm

  • Option D

    100 cm

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• MCQmediumCenter of maas , Momentum and Collisionimpuse and question based on it

  Four force-time graphs (a), (b), (c) and (d) are shown. In which graph is the impulse maximum?

  

  Options

  • Option A

    Fig (c)

  • Option B

    Fig (b)

  • Option C

    Fig (a)

  • Option D

    Fig (d)

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• IntegermediumFluid Mechanicsequation of continuity and bornullie theorem

  A water tank has cross-sectional area 750 cm². Water leaves through a tap of area 500 mm² with speed 30 cm s⁻¹. At that instant, dh/dt = -x × 10⁻³ m s⁻¹. Find x.

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