SESSION ENDING EXAMINATION
TIME 3 HRS
- All questions are compulsary
- There are 30 questions in total. Questions 1 to 8 carry 1 mark each. Questions 9 to 18 carry 2 marks each. Questions 19 to 27 carry 3 marks each and questions 28 to 30 carry 5 marks each.
- Use of calculators is not permitted.
******Choices are avoided as this is a question paper meant for practice ***********
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- State the Principle of a potentiometer. (The students say that potential drop is proportional to length but the constant quantities are not mentioned)
- How can we increase the sensitivity of a potentiometer?
- Define figure of merit of a galvanometer.
- Which has more resistance – a galvanometer or a milliammeter?
- How does an LED emit light?
- What is the difference between an ordinary diode and an LED?
- Define principal axis of a convex lens?
- What happens to the focal length of a concave mirror if it is immersed in water?
- What are the factors affecting the internal resistance of a cell?
- What are the difference between primary and secondary cell?
- Why can’t we use a dry cell for starting a car?
- What happens to the resistivity of a wire when it is doublefolded?
- How does the resistance of a wire depend on its dimensions?
- Why are the resistances used in a resistance box is like 1,2,2,5,10,20,20,50,100,200,
- Why constantan or manganin wires are used for making the resistance coils in resistance box?
- What is a standard resistance?
- What are the characteristics of a standard resistance?
- What are the precautions to be observed while doing electricity experiments in general?
- What is a galvanometer?
- What is the resistance of an ideal ammeter?
- Why is ammeter always connected in series and voltmeter always connected in parallel?
- How can we convert a galvanometer into an ammeter or a voltmeter?
- What is shunt?
- What is AVO meter?
- What is the effect of temperature on the resistance of a conductor?
- Why does the resistance of a conductor increases with temperature, whereas that of a semiconductor decreases with temperature.
- What is conductance?
- What are non ohmic devices? give an example.
- What are superconductors?
- Define emf
- Why emf is said to be a misnomer?
- What happens if the battery used in the primary circuit of a potentiometer has less emf compared to the emf of the cell used in the secondary circuit?
- If you find that the galvanometer reading is shaky, what error can you expect?
- What do you mean by figure of merit of a galvanometer?
- Why a moving coil galvanometer is called so?
- What is the principle of a galvanometer?
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