RBSE Class 12 Physics Model Paper 2 English Medium are part of RBSE Class 12 Physics Board Model Papers. Here we have given RBSE Class 12 Physics Sample Paper 2 English Medium.

Board |
RBSE |

Textbook |
SIERT, Rajasthan |

Class |
Class 12 |

Subject |
Physics |

Paper Set |
Model Paper 2 |

Category |
RBSE Model Papers |

## RBSE Class 12 Physics Sample Paper 2 English Medium

**Time : 3 ¼ hours**

**Total: 56 **

**General Instructions to the Examinees**

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

paper, the question of Hindi version should be treated valid. -
**Question Nos****Marks per Questions**1-13 1 14-24 2 25-27 3 28-30 4 - There are internal choices in Q. NOs. 21 and 27 to 30.
- Use of calculator is not allowed in the examination.

**Section – A**

Question 1.

Define electric dipole moment. **[1]**

Question 2.

A wire of resistivity 2 is strectched to double its length. What will be the new resistivity now? **[1]**

Question 3.

Write dimensional formula of magnetic field. **[1]**

Question 4.

Write resistance of an ideal voltmeter and an ideal ammeter. **[1]**

Question 5.

Write two properties of magnetic lines of force. **[1]**

Question 6.

A coil having 1000 no. of turns and area 0.02m² is placed perpendicular to magnetic field 5 x 10^{-3}T. Calculate flux passing through this coil. **[1]**

Question 7.

Write working principle of optical fibre. **[1]**

Question 8.

Define stopping potential in photoelectric effect. **[1]**

Question 9.

Calculate De-Broglie wavelength of an electron accelerated through a potential difference of 10 kv. **[1]**

Question 10.

Draw symbolic diagram of a nuclear fission chain reaction. **[1]**

Question 11.

Draw symbolic diagram of a NOR gate having three inputs. **[1]**

Question 12.

The maximum value of electric field of E vector of sinusoidal electromagnetic waves at perticular instant is 300 V/m. Find the maximum value of magnetic field vector at that particular instant. **[1]**

Question 13.

Draw block diagram of a receiver for receiving amplitude modulated waves. **[1]**

**Section – B**

Question 14.

Two equal point charges of 10 μc are kept at two vertices of an equilateral triangle having side 10 cm. Calculate magnitude of electric field intensity at third vertices of triangle. **[2]**

Question 15.

A cell having emf 2 volt is balanced at length 500 cm of potentiometer wire if cell is connected to a shunt of 4Ω resistor then balancing length reduced by 100 cm findout internal resistance of cell. **[2]**

Question 16.

Two cells having emf E_{1}, E_{2} and internal resistance r_{1}, r_{2} respectively are connected in parallel combination. Find out equivalent emf of this combination. **[2]**

Question 17.

If 2 amp. current flows in primary coil reduced to zero in 5 mili sec. then 20 mili volt emf produces in secondary coil. Determine mutual inductance of these coils. **[2]**

Question 18.

The horizontal component of earth magnetism and dip angle at a place are 0.5 x 10-4 T and 60°. Determine the total magnetic field of earth magnetism at that place. **[2]**

Question 19.

Establish a relation between radius of curvature and focal length for a spherical mirror. **[2]**

Question 20.

The Radius of curvature of two surfaces of a convex lens are 10 cm and 20 cm respectively. The refrective index of glass is 1.5 then determine focal length of the lens. **[2]**

Question 21.

Difine binding energy per neucleon and draw graph of its with mass number. **[2]**

**OR**

Write the Rutherford-Soddi law of radio active decay and draw decay curve.

Question 22.

Write object of Davission and Germer’s experiment. Draw a labelled diagram of its practical arrangement. **[2]**

Question 23.

Explain the action of junction layer at the time of formation of p-n junction. Explain effect on depletion of layer when junction is reverse based. **[2]**

Question 24.

Write frequency range of career waves using in space wave propagation. Establish relation between covering range and height of transmitting antena. **[2]**

**Section – C**

Question 25.

Write second postulate of Bohr’s model for hydrogen atom prove that the radius of n^{th }orbit is directly proportional to the square of orbit number n. **[3]**

Question 26.

Draw the circuit diagram of practical arrangement to study the characteristics of PNP transitor in common emitter configration. Sketch typical output characteristics curves and explain the calculation of current gain from these curves. **[3]**

Question 27.

State Bio-Savart law. Using this law find an expression for the magnetic field at a point on the axis of a current carrying circular coil. **[3]**

**OR**

State Ampere’s ciruital law Using this law derive an expression for the magnetic field along the axis of a toroid.

**Section – D**

Question 28.

State Gauss’s law in electrostatics. Derive an expression for electric field intensity due to uniformly charged non conducting sphere. When point is situated **[4]**

- out side
- inside the sphere. Draw necessary diagram.

**OR**

Write principle of a capacitor. Derive an expression for capacitance of a parallel plate capacitor, partially filled with dielectric. Draw necessary diagram.

Question 29.

State Lenz’s law for electromagnetic induction. Derive an expression for induced emf in rectangular coil moving perpendicular to non uniform magnetic field with uniform velocity. Draw the necessary diagram. **[4]**

**OR**

Define impedance. A series L-C-R circuit is connected to an AC source V = V^{ }_{0} sin w.t.

Derive an expression for impedance using phasor diagram.

Question 30.

What is meant by interferrence of light? Derive an expression of fringe width in Young’s double slit experiment. Draw necessary diagram. **[4]**

**OR**

What is meant by diffraction? Differentiate between diffraction of light and sound waves. Draw the intensity distribution curve in frounhofer diffraction due to single slit. Explain to maximum intensity in this diffraction.

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