CBSE Class 12 Physics Sample Paper Set 2 — Free PDF
Advanced physics sample paper covering electromagnetism, optics, modern physics, and nuclear physics. Solve comprehensive numerical and theoretical problem
TL;DR: Advanced physics sample paper covering electromagnetism, optics, modern physics, and nuclear physics. Solve comprehensive numerical and theoretical pr…
Written & reviewed by the Syllab.in Academic Team (CBSE/NCERT subject experts) · Updated
Advanced physics sample paper covering electromagnetism, optics, modern physics, and nuclear physics. Solve comprehensive numerical and theoretical problems with detailed explanations. This is a shortened practice set: 27 questions worth 68 marks, following the 70-mark CBSE paper pattern. Use it for timed practice, not as a full-length mock.
Board: CBSE · Class: Class 12 · Subject: Physics · Total: 68 marks · Time: 3 hours
Section A - Multiple Choice Questions — 8 marks
Attempt all questions. Each question carries 1 mark.
Q1. The SI unit of magnetic flux density is? (1 mark)
Answer: Tesla (T)
Q2. Which material is used as dielectric in capacitors? (1 mark)
Answer: Glass, Mica, Paper, Ceramic
Q3. The photoelectric effect was explained by? (1 mark)
Answer: Albert Einstein
Q4. What is the wavelength range of visible light? (1 mark)
Answer: 400-700 nm
Q5. The nucleus was discovered by? (1 mark)
Answer: Ernest Rutherford
Q6. Which of the following is a vector quantity? (1 mark)
Answer: Force
Q7. The SI unit of capacitance is? (1 mark)
Answer: Farad (F)
Q8. What is the rest mass of electron? (1 mark)
Answer: 9.1 x 10^-31 kg
Section B - Short Answer Questions — 27 marks
Attempt all questions. Each question carries 2 or 3 marks.
Q1. Define magnetic field and write its SI unit. (2 marks)
Answer: Region around magnet where magnetic force acts, SI unit is Tesla (T)
Q2. State Faradays law of electromagnetic induction. (2 marks)
Answer: EMF = -N(d-flux/dt), Induced EMF equals negative rate of change of magnetic flux
Q3. Explain the working principle of a transformer. (3 marks)
Answer: Two coils on common core, Changing current in primary creates changing magnetic field, Induces EMF in secondary
Q4. Write the equation for electromagnetic wave and identify its components. (2 marks)
Answer: E = E0 sin(kx - omega*t), Components: Electric field and Magnetic field perpendicular to each other
Q5. What is the photoelectric effect? Explain why frequency has threshold value. (3 marks)
Answer: Electrons ejected from metal by light, Threshold frequency required to provide work function energy
Q6. Define critical angle and total internal reflection. (2 marks)
Answer: Critical angle: incident angle for which refracted angle = 90 degrees, Total internal reflection occurs beyond this angle
Q7. Explain single slit diffraction pattern. (2 marks)
Answer: Single slit acts as source of secondary wavelets, Creating central maximum and side bands with decreasing intensity
Q8. What is the de Broglie wavelength? Write its expression. (2 marks)
Answer: wavelength = h/p where h is Planck's constant, p is momentum
Q9. Define binding energy and write its expression using Einstein's mass-energy relation. (3 marks)
Answer: BE = (mass defect) * c^2, Energy required to separate nucleus into constituent nucleons
Q10. Explain the process of nuclear fission with example. (2 marks)
Answer: Heavy nucleus splits into lighter fragments releasing energy, Example: U-235 splitting
Q11. What is half-life of a radioactive substance? (2 marks)
Answer: Time required for half of original atoms to decay
Q12. Draw ray diagram for image formation by convex lens with object at focal point. (2 marks)
Answer: Image at infinity, Real, Inverted
Section C - Long Answer Questions — 33 marks
Attempt all questions. Each question carries 4 or 5 marks.
Q1. Derive Ohms law from Drifts of electrons. Explain conductivity and resistivity. (5 marks)
Answer: Drift velocity of electrons under electric field, V = IR where I = neAv, Resistivity measures material property
Q2. Explain construction and working of moving coil galvanometer. How can it be converted to ammeter? (5 marks)
Answer: Coil rotates in magnetic field, Deflection proportional to current, Add shunt resistance in parallel for ammeter
Q3. Derive lens maker's formula and explain refraction at two surfaces. (5 marks)
Answer: 1/f = (n-1)(1/R1 - 1/R2), Light refracts at both curved surfaces, Combined effect determines focal length
Q4. Explain double slit interference pattern. Derive expression for fringe width. (5 marks)
Answer: Two coherent sources create interference, Fringe width beta = lambda*D/d, Bright fringes at path difference n*lambda
Q5. State and derive Bohr's postulates for hydrogen atom. Calculate radius of first orbit. (5 marks)
Answer: Quantization of angular momentum, Energy levels, Ground state radius = 0.53 Angstrom
Q6. Explain radioactive decay process with decay equation. Discuss alpha and beta decay. (4 marks)
Answer: N = N0 * e^(-lambda*t), Alpha: Helium nucleus emitted, Beta: Electron or positron emitted
Q7. Derive Einstein's mass-energy relation E = mc^2 and explain its significance. (4 marks)
Answer: Energy-mass equivalence, Shows mass can be converted to energy, Basis of nuclear reactions
FAQs
What is the exam pattern for Class 12 Physics?
70 marks with 3 hours duration, covering MCQ, short answer, and long answer questions on both theoretical and numerical problems.
Which topics are most important?
Electromagnetism, Optics, Modern Physics, Nuclear Physics are crucial for board exams and competitive exams.
How to solve numerical problems efficiently?
Understand underlying concepts, Identify relevant formulas, Substitute values carefully, Check units and significant figures.
All sample papers → · Previous-year questions → · Chapter-wise MCQs →