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Physics Question Paper 2023 - MP Board 12th

• Exam: Higher Secondary Examination (Main) 2023
• Subject: Physics
• Total Questions: 19
• Total Pages: 8
• Time: 3 Hours
• Maximum Marks: 70
• Instructions:
  • All questions are compulsory.
  • Internal options are provided for questions 5 to 19.
• Marking Scheme:
  • Questions 1 to 4: 7 marks each, sub-questions carry 1 mark
  • Questions 5 to 12: 2 marks each, word limit ≈ 30 words
  • Questions 13 to 16: 3 marks each, word limit ≈ 75 words
  • Question 17: 4 marks, word limit ≈ 120 words
  • Questions 18 to 19: 5 marks each, word limit ≈ 150 words
  • Draw neat and labeled diagrams wherever necessary.

Multiple Choice Questions (MCQs)

• Unit of current density: Ampere/meter²
• Phase difference in AC circuit with capacitor: π/2
• Location of Bhabha Atomic Research Centre: Mumbai
• Forbidden energy gap for Germanium: 0.72 eV
• Rectifier device: Junction diode
• Focal length of eye piece in Telescope: Less than the objective
• Mass of a Neutron: 1.67 × 10^-27 kg

Fill in the Blanks

• Ohmic resistance of an ideal inductor: Zero
• Frequency of Direct Current: Zero
• Highest frequency electromagnetic wave: Gamma rays
• Frequency of light: Decreases when going to denser medium
• Magnetic field: Vector quantity
• Reduced Galvanometer resistance: Shunt

True or False

• Infrared radiation invented by Retar: True
• Free electrons = holes in intrinsic semiconductor: True
• Voltmeter better than potentiometer: False
• De-Broglie waves are electromagnetic: False
• Atom is positive particle: False
• Average power to an inductor is zero: True
• Microwave oven works on radio waves: True

Short Answer Questions

• Threshold frequency: Minimum frequency required for photoelectric emission
• Diffraction: Bending of light waves around obstacles
• Unit of power of lens: Dioptre
• Magnetic dipole moment direction: Same direction as current by right hand rule.
• Changing galvanometer to voltmeter: Use a high resistance in series with galvanometer
• Temperature effect on drift velocity: Increases with temperature
• Relation between energy and frequency of radiation: E = hf (where E is energy, h is Planck's constant, and f is frequency)

Photoelectric Effect

• Definition: Emission of electrons when light falls on a material.
• Einstein's photoelectric equation:
  e V₀ = hf - φ (where e is the electron charge, V₀ is the stopping potential, h is Planck's constant, f is the frequency and φ is the work function of the metal.)

De Broglie Matter Waves

• Definition: Waves associated with matter particles

Bohr Model

• Postulates (Two Examples): Electrons orbit the nucleus in discrete energy levels and angular momentum is quantized. These postulates explain the hydrogen spectrum.

Isotopes and Isobars

• Isotopes: Atoms of the same element with different numbers of neutrons.
• Isobars: Atoms of different elements with the same mass number.

Other Questions

• The questions cover a wide range of topics in physics.
• The various questions discuss different areas of physics that are tested by the board.