CBSE 2014 Physics Question Paper for Class 12

About this paper

This is CBSE Class 12 Physics (Theory) question paper code 55/1/1, Series OSR/1, from the 2014 board examination. It carries 70 marks over three hours and has 30 compulsory questions, rising from one-mark very short answers to three five-mark long answers. One of the three-mark questions is a value-based question about a mobile transmission tower in a residential colony. There is no overall choice, but internal choices are given in one two-mark question, one three-mark question and all three five-mark questions. Calculators are not allowed; log tables may be used, and the physical constants are printed on the paper. This copy has the questions only, without answers.

Exam

CBSE Class 12

Subject

Physics

Year

2014

Paper code

55/1/1

Maximum marks

70

Time allowed

3 hours

Questions

30

Pages

16

Answers included

No, questions only

Paper pattern

• Questions 1–8

  8 marks

  Very short answer questions, one mark each

• Questions 9–18

  20 marks

  Short answer questions, two marks each; internal choice in one

• Questions 19–27

  27 marks

  Short answer questions, three marks each, including one value-based question; internal choice in one

• Questions 28–30

  15 marks

  Long answer questions, five marks each, each with an internal choice

Topics covered

• Electrostatics and capacitors
• Current electricity and potentiometer
• Magnetic effects of current and Ampère's law
• Magnetic materials
• Electromagnetic induction and AC
• Electromagnetic waves
• Ray optics and microscopes
• Interference and polarisation
• Dual nature of matter
• Atoms and radioactive decay
• Semiconductors, transistors and logic gates
• Communication systems

Questions from this paper

1. Define the mobility of charge carriers in a conductor and write its SI unit.
2. A 12.5 eV electron beam bombards gaseous hydrogen at room temperature. Up to which energy level are the atoms excited? Calculate the wavelengths of the first member of the Lyman and Balmer series.
3. A potentiometer wire 1 m long has a resistance of 10 Ω and is connected to a 6 V battery in series with a 5 Ω resistor. Find the emf of a primary cell that gives a balance point at 40 cm.
4. In what way can a mobile company's transmission tower in a residential colony be injurious to health, and what value did Sunita display by objecting to it?
5. Deduce the expression N = N₀e^(−λt) for the law of radioactive decay.
6. With a circuit diagram, describe how an n-p-n transistor in CE configuration amplifies a small sinusoidal input voltage.