Physics — Important Questions
Chapter-wise important questions for TS Intermediate 2nd Year Physics — organised by VSAQ, SAQ, and LAQ as per the TGBIE exam pattern. Paper: 60 marks · 3 hours.
VSAQ(2 marks each)
Answer in 2–3 lines. Attempt all 10.
- 1.[Ray Optics]What is the relation between focal length and radius of curvature of a spherical mirror?
- 2.[Ray Optics]Define critical angle. A light ray passes from glass (n = 1.5) to air. Find the critical angle.
- 3.[Wave Optics]What is meant by coherent sources? Why is ordinary light not used in Young's experiment?
- 4.[Electrostatics]State Gauss's law. Write its mathematical form.
- 5.[Electrostatics]What is an equipotential surface? Why is no work done moving a charge along it?
- 6.[Current Electricity]State Kirchhoff's junction rule and loop rule.
- 7.[Moving Charges]What is the force on a current-carrying conductor placed parallel to a magnetic field?
- 8.[EMI]State Lenz's law. How does it follow from the law of conservation of energy?
- 9.[Dual Nature]Define work function. What is its SI unit?
- 10.[Atoms]Write the postulates of Bohr's atomic model.
SAQ(4 marks each)
Answer in 5–7 lines. Diagrams must be drawn in pencil. Choose 6 from 8.
- 1.[Ray Optics]Derive the mirror formula 1/f = 1/v + 1/u for a concave mirror.
- 2.[Ray Optics]Explain how a compound microscope forms a magnified image. Write the formula for magnification.
- 3.[Current Electricity]Describe the Wheatstone bridge principle. Derive the balance condition P/Q = R/S.
- 4.[Current Electricity]Explain the working of a potentiometer. How is it used to compare EMFs of two cells?
- 5.[Moving Charges]Derive an expression for the force on a current-carrying conductor in a uniform magnetic field. Hence define 1 Tesla.
- 6.[EMI & AC]Derive the expression for the impedance of a series LCR circuit. What is the condition for resonance?
- 7.[Dual Nature]State Einstein's photoelectric equation. Explain how it accounts for all the experimental observations.
- 8.[Atoms]Derive expressions for the radius and energy of the nth Bohr orbit in a hydrogen atom.
LAQ(8 marks each)
Full answer with derivation and diagram required. Choose 2 from 4.
- 1.[Ray Optics]Derive the lens maker's equation. If two thin lenses of focal lengths f₁ and f₂ are in contact, show that the equivalent focal length is 1/f = 1/f₁ + 1/f₂.
- 2.[Electrostatics]Derive the expression for the electric field and potential due to an electric dipole (a) on the axial line and (b) on the equatorial line.
- 3.[Moving Charges]State Biot-Savart law. Derive the magnetic field at the centre of a circular coil carrying current and at a point on the axial line.
- 4.[Nuclei / Modern Physics]State Radioactive decay law. Derive N = N₀e^(−λt). Define half-life and mean life and find their values in terms of λ.