MP Board 12th Physics Question Paper 2023 PDF

## MP Board 12th Physics Question Paper 2023 ### Instructions: * All questions are compulsory. Internal options are given in each question Nos. 5 to 19. * Each question from Question Nos. 1 to 4 carries 7 marks and each sub-question carries 1 mark. * Each question from Question Nos. 5 to 12 carries...

## MP Board 12th Physics Question Paper 2023 ### Instructions: * All questions are compulsory. Internal options are given in each question Nos. 5 to 19. * Each question from Question Nos. 1 to 4 carries 7 marks and each sub-question carries 1 mark. * Each question from Question Nos. 5 to 12 carries 2 marks and word limit for each answer is approx. 30 words. * Each question from Question Nos. 13 to 16 carries 3 marks and word limit for each answer is approx. 75 words. * Question No. 17 is given 4 marks and word limit for answer is approx. 120 words. * Each question from Question Nos. 18 to 19 carries 5 marks and word limit for each answer is approx. 150 words. * Draw neat and labelled diagrams wherever necessary. ### Questions: **1. Select and write the correct option from the options given in each question:** * **(a) S.I. unit of current density is -** * (i) Coluomb / meter * (ii) Ampere/meter² * (iii) Coluomb / meter² * (iv) Ampere/meter * **(b) The phase difference between flowing current and applied voltage in alternating circuit containing pure capacitor is -** * (i) 0 * (ii) 1 * (iii) π/2 * (iv) –π/2 * **(c) Bhabha Atomic Research Centre is situated in -** * (i) New Delhi * (ii) Mumbai * (iii) Kolkata * (iv) Bangalore * **(d) Forbidden energy gap for Germanium semi conductor is -** * (i) 1.1 eV * (ii) 1.9 eV * (iii) 0.72 eV * (iv) 0.75 eV * **(e) Which device is used as a rectifier?** * (i) Junction diode * (ii) Transformer * (iii) Zener diode * (iv) Photo diode * **(f) The focal length of eye piece in telescope ____ the focal length of the objective.** * (i) is less than * (ii) is more than * (iii) is equal * (iv) none of these * **(g) The mass of a Neutron is -** * (i) 1.67 × 10^-31 kg * (ii) 1.67 × 10^-27 kg * (iii) 1.67×10^-9 kg * (iv) 1.67 × 10^-23 kg **2. Fill in the blanks and write:** * (i) The ohmic resistance of an ideal inductance is ______. * (ii) The frequency of a Direct Current is ______. * (iii) Electromagnetic wave of highest frequency is ______. * (iv) The frequency of the light wave is order of ______ when it goes to rare medium to denser. * (v) The velocity of light ______ quantity. * (vi) Magnetic field is a ______. * (vii) The ______ of the galvanometer is reduced by the use of shunt. **3. Write True or False:** * (i) Infrared radiation is invented by scientist Retar. * (ii) In an intrinsic semiconductor the number of free electron is equal to the number of holes. * (iii) Voltmeter is more superior to potentiometer. * (iv) De-broglie waves are an electromagnetic wave. * (v) Atom is a positive particle. * (vi) The average power supplied to an inductor over one complete cycle is zero. * (vii) Working of microwave oven is based on Radio wave. **4. Write answer of each question in one sentence:** * (i) What is threshold frequency? * (ii) What is diffraction? * (iii) What is the unit of power of lens ? * (iv) What is direction of magnetic dipole moment of a Magnet? * (v) How Galvanometer is changed in a voltmeter ? * (vi) What is the affect of temperature on drift velocity? * (vii) Give relations between energy and frequency of a radiation. **5. What is Photoelectric effect ? Write Einstein photo electric equation.** **OR** **What is de-broglie matter wave. Write de-broglie wave relation.** **6. Write any two Postulate of Bohr's model.** **OR** **Who discovered the nucleus model of atom ? Draw its diagram.** **7. What is isotopes ? Write any two isotopes of hydrogen atom.** **OR** **What is Isobar? Give example.** **8. What is a fundamental charge ? Write its value.** **OR** **Where will an electron move in an electric field either high potential side or low potential side? and why?** **9. What is an electric cell? Give example.** **OR** **Write Ohm's law and also draw graph between voltage and current.** **10. Write Bio-savart expansion in vector form.** **OR** **Why there is no end point of magnetic field lines.** **11. A light bulb is rated at 200 W for a 220 V supply. Find the resistance of the bulb.** **OR** **A light bulb is related at 200 W for a 220 V supply. Find the rms current through the bulb.** **12. What is Conjugate focus?** **OR** **Write any two difference between refractive telescope and refractive reflective telescope.** **13. Compare the resistance of 100 watt and 400 watt of two bulbs if their voltage is same.** **OR** **What will be the resistance of a wire if their length change to half of their original length and cross sectional area change two times of original.** **14. The radii of curvatures of the focus of a double convex lens are 10 cm and 15 cm its focal length is 12 cm. What is the refractive index of glass. (refractive index of air = 1)** **OR** **A convex lens has 20 cm focal length in air. What is focal length in water? (Refractive index of air-water = 1.33, refractive index for air-glass = 1.5)** **15. Derive an expression for the Coulomb's law of electrostatic by Gauss law.** **OR** **What is Capacity of a conductor? Write the factor affecting the capacity of a conductor.** **16. Write any three differences between electromotive force and potential difference.** **OR** **Write any three differences between Resistance and Specific Resistance.** **17. Write the differences between, intrinsic semiconductor and extrinsic semi conductor.** **OR** **What is P-N junction diode? Describe its use as a full wave rectifier with diagram.** **18. Derive an expression for the refractive index of glass prism.** **OR** **Derive lens maker formula for thin lens.** **19. What is Self inductance ? Derive an expression for the self inductance of solenoid. Also write the factor affecting it.** **OR** **What is Transformer? Describe its principle and different types of energy losses in it.**