Physics Paper 1 Predictions

• Predicted Physics Paper 1 Instructions: All questions are compulsory, use graph paper if necessary, draw neat diagrams, show all steps for numerical problems and internal choices are provided.

Multiple Choice Questions

• For a material with a threshold frequency of 5 × 10¹⁴ Hz, incident light of frequency 6 × 10¹⁴ Hz will cause electron emission with energy 1.24 eV.
• A full-wave bridge rectifier requires 4 diodes.
• In an elastic collision, both momentum and kinetic energy are conserved.
• The electric field at a point on the axial line of a dipole varies with distance as r².
• In a semiconductor, increasing temperature has no effect on resistivity.
• For a parallel plate capacitor with halved distance and a dielectric constant k = 5, the capacitance becomes 10 times.
• The energy stored in a capacitor is given by 1/2 CV².
• A charged particle moving perpendicular to a magnetic field follows a circular path.
• The minimum deviation for a prism occurs when light passes symmetrically.
• The potential gradient in a conductor is defined as IR.

Short Answer Questions

• Reverse bias in a diode can be a question
• Define the dielectric constant.
• Write the relation between n, v, u, and R for a lens.
• What is the principle of a transformer?
• State Ohm's law.

Section B

• Define potential gradient and derive its SI unit.
• Explain nuclear binding energy with a graph.
• Draw the energy band diagram for a conductor, semiconductor, and insulator.
• Two charges, +500 µC and -300 µC, are placed 80 cm apart, determine the electric field at the midpoint.
• Illustrate the difference between interference and diffraction with diagrams.

Section C

• Derive the expression for the axial electric potential of an electric dipole.
• Obtain the formula for the minimum deviation of a prism: dm = (n - 1) A
• Draw a graph showing the variation of resistance with temperature for a semiconductor.
• Convert a galvanometer into a voltmeter with a diagram and proper explanation.

Circuit Analysis

• Calculate the equivalent resistance of the entire circuit given resistor values.
• Determine the current flowing through each resistor in the circuit.
• Find the potential difference across each resistor with given values.

Electron in Magnetic Field

• An electron with mass 9.11 × 10⁻³¹ kg and charge -1.6 × 10⁻¹⁹ C moving in a 0.5 T magnetic field perpendicular to its velocity involves deriving the expression for the radius of the circular path
• Plot a graph of radius vs magnetic field strength.
• Explain how the graph would change if the particle's speed doubled.

Diffraction Grating

• A light wave is incident on a plane diffraction grating with 5000 lines per cm. The wavelength of the light is 600 nm.
• Derive the grating equation.
• Calculate the angle of the first-order diffraction maximum.
• Sketch the intensity pattern for the diffraction maxima.