RBSE Class 12 Physics Model Paper 1 English Medium

RBSE Class 12 Physics Model Paper 1 English Medium are part of RBSE Class 12 Physics Board Model Papers. Here we have given RBSE Class 12 Physics Sample Paper 1 English Medium.

RBSE Class 12 Physics Sample Paper 1 English Medium

Time : 3 ¼ hours
Total: 56

General Instructions to the Examinees

1. Candidate must first his/her Roll No. on the question paper compulsorily.
2. All the questions are compulsory.
3. Write the answer to each question in the given answer-book only.
4. For questions having more than one part, the answer to those parts are to be written together in continuity.
5. If there is any error/difference/contradiction in Hindi & English version of the question
   paper, the question of Hindi version should be treated valid.

6. Question Nos	Marks per Questions
   1-13	1
   14-24	2
   25-27	3
   28-30	4

7. There are internal choices in Q. NOs. 21 and 27 to 30.
8. Use of calculator is not allowed in the examination.

Section – A

Question 1.
Write the name of physical quantity whose unit is J/C. State whether this quantity is a vector or scalar? [1]

Question 2.
Define Super Conductivity. [1]

Question 3.
Write the definition of figure of merit of Galvanometer. [1]

Question 4.
Draw hysteresis curve (B-H curve) for a ferromagnetic substance. [1]

Question 5.
Find the time taken by alternating current to attain zero from peak value. The frequency of alternating current is 50Hz. [1]

Question 6.
Write Malus law. [1]

Question 7.
What does mean by word function for metals? [1]

Question 8.
Fine the de-Broglie wave length related to an electron accelerated by 10⁴ volt. [1]

Question 9.
Write the name of any one dopped semiconductor used for making light emitting diode (LED). [1]

Question 10.
Draw the curve for intensity distribution in diffraction by single slit. [1]

Question 11.
What will be the value of neutron multiplication factor for controlled chain reactions? [1]

Question 12.
Draw a diagram of amplitude modulated wave. [1]

Question 13.
Write any two Maxwell’s equations. [1]

Section – B

Question 14.
Electric Potential on the surface of a charged spherical shell of radius 10cm is 50 volt. Find the value of electric potential at a distance of 20cm from the centre of spherical shell. [2]

Question 15.
The Resistance of a conductor is XΩ at 0°C temp. Find the temperature at which the resistance of conductor becomes 3XΩ. The temp. coefficient of resistance for counductor is 0.4 x 10^-2°C^-1 which is constant. [2]

Question 16.
Obtain necessary condition for balancing state of Wheat Stone Bridge by using Kirchhoff’s law. Draw necessary circuit diagram. [2]

Question 17.
Obtain an expression for magnetic field due to infinitely long straight current carrying conductor by using Amperes law. [2]

Question 18.
The resistance of a galvanometer is 99Ω. The necessary current for full scale deflection is 1mA. If a shunt of 1ΩA. If a shunt of 1Ω is conncected with galvanometer then find the value of maximum current which can be measured by this galvanometer. [2]

Question 19.
(a) Write definition of Curie temperature for ferromagnetic substances.
(b) Obtain an expression for magnetic moment of an orbital electron. [2]

Question 20.
The lenght of side of a square loop is 4m. This loop is placed in an uniform magnetic field of 2.5 T. Outside the loop, the magnetic field is zero and it is coming out side from magnetic field perpendicularly with velocity 2m/s. Find the value of induced emf in loop after one second. [2]

Question 21.
Find the ratio of maximum wavelength to minimum wavelenght for the lines of Balmer series in hydrogen spectrum.
OR
In a radioactive sample the numbers of active nuclei remains 6.25% of its initial value in 6hr. Find the half or radioactive sample. [2]

Question 22.
Derive Einstein’s Photoelectric equation. Explain photoelectric effect with help of this equation. [2]

Question 23.
(a) What are logic gates?
(b) Draw a circuit diagram for dual-input AND Gate by using two diodes. [2]

Question 24.
Establish a relation between maximum distance of broadcast and height of antenna in space wave propagation. [2]

Section – C

Question 25.
(a) What does mean by magnifying power of a Microscope?
(b) An object is placed at 20 cm from a convex lens. If 3 times magnified real image is formed by the lens find the focal length of lens. [3]

Question 26.
What does mean by mass defect? Establish relation between mass defect and nuclear binding energy. And hence write the expression for binding energy per nucleon. [3]

Question 27.
Draw circuit diagram for P-N junction to obtain reverse bias characteristic curves. Explain the phenomenon of reverse breakdown for a P-N junction in reverse bias state by following processes [3]

1. Avalanche breakdown
2. Zener breakdown.

OR
Draw circuit diagram for a NPN-transistor to obtain characteristic curves in common base configuration. Establish a relation between current amplification factors for a transistor in common base and common emitter configuration.

Section – D

Question 28.
Write the definition of electric field intensity. [4]
Obtain an expression for electric force and electric pressure on the surface of a charged conductor.
Draw the necessary diagram.
OR
What does mean by energy stored in a capacitor?
Prove that
“The ratio of change in potentials of conductors after connecting two charged conductors is inversely proportional to their capacitances”.
Draw a curve between electric field and distance for an uniformly charged non-conducting sphere.

Question 29.
Write one merit and one de-merit of a alternating current in comparision of direct current.  [4]
Obtain expression for followings in a pure inductive alternating current circuit

1. Instantaneous value of current
2. Reactance of circuit
3. Peak value of current. Draw curve for power in pure inductive circuit.

OR
What does meant by half powerpoint frequencies.
Obtain an expression for bandwidth in a LCR series circuit.
Show half power point frequencies in curve between alternating current and frequency.

Question 30.
Write any two necessary conditions for interference of light. [4]
Obtain an expression for fringe width in Young’s double slit experiment.
Draw curve for intensity distribution in Young’s double slit experiment.
OR
Write definitions of plane of vibration and plane of polarisation.
Explain the working process to obtain plane polarised light by Nicol Prism.
Draw necessary diagram.

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