Board Jharkhand Academic Council [JAC] Class Intermediate  XIIth / 12th Download Model Question Paper Year 2021 Subject Science Official Website https://jac.jharkhand.gov.in/jac/

## Science Model Questions

Physics:
Fill in the blanks :
1. ……….. is the least value of electric charge available in free state.
2. Electric current is a ………….. quantity.
3. Unit of intensity of magnetic field is …………….
4. Self induction is also known as Inertia of ………………..
5. Energy required to extract one nucleon from the nucleus is ……..
6. At ………….temperature an intrinsic semiconductor behave like a perfect insulator.

1. Define electric dipole moment. Give its unit.
2. Write two factors on which the mutual inductance of a pair of coils depends.
3. A proton and electron have got same de-broglie wave length. Explain which has greater total energy?
4. Define mass defect and nuclear binding energy.
5. What is a rectifier? On what principle does it work?
6. Give the symbol and truth table for NAND gate and NOR gate.
7. Write the function of a)
(i) Transducer and
(ii) Repeater in a communication system

1. State coulomb’s law in electrostatics in vector form. Also write the limitations of coulomb’s law.
2. State Lenz’ law and show that it is in accordance with the law of conservation of energy.
3. Mention two applications of Microwaves, X-rays and ultraviolet radiations.
4. What is polarization of light? State and explain Brewster’s law.
5. What are the essential elements of communication system? Explain briefly with block diagram.

1. State the principle of working of a meter bridge. Draw the circuit diagram for finding an unknown resistance using a meter bridge.
Derive an expression for magnetic field at a point on the axis of a current carrying circular loop.
(OR)
Explain the combination of identical resistors
(i) in series and
(ii) in Parallel.
(b) (i) What is Biot- Savart Law?
(ii) A circular coil of wire consisting of 100 turns, each of radius 4.0cm, carries a current of 0.20A. What is the magnitude of magnetic field at the centre of the coil?

2. (i) Draw a labeled diagram to show the formation of image of an object in a compound microscope.
(ii) Derive an expression for its magnifying power.
(iii) What is the nature of the image formed.
(OR)
(i) Define wave front and secondary wavelets.
(ii) Distinguish between spherical and plane wave front.
(iii) Establish the laws of refraction of light on the basis of wave theory of light.

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