Maharashtra HSC Class 12 Physics February 2024 question paper
Maximum marks 70 · Time 3 hours
Try each question first, then open its model answer. Where the paper offers a choice, both questions are shown with OR between them.
Section A
1 mark each
- Q.1 (i)1 markThe moment of inertia (MI) of a disc of radius R and mass M about its central axis is _____.
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- Q.1 (ii)1 markThe dimensional formula of surface tension is _____.
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- Q.1 (iii)1 markPhase difference between a node and an adjacent antinode in a stationary wave is _____.
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- Q.1 (iv)1 markThe work done in bringing a unit positive charge from infinity to a given point against the direction of electric field is known as _____.
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- Q.1 (v)1 markTo convert a moving coil galvanometer into an ammeter we need to connect a _____.
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- Q.1 (vi)1 markIf the frequency of incident light falling on a photosensitive material is doubled, then kinetic energy of the emitted photoelectron will be _____.
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- Q.1 (vii)1 markIn a cyclic process, if internal energy, W = work done, Q = Heat supplied then
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- Q.1 (viii)1 markThe current in a coil changes from 50A to 10A in 0.1 second. The self inductance of the coil is 20H. The induced e.m.f. in the coil is _____.
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- Q.1 (ix)1 markThe velocity of bob of a second's pendulum when it is 6 cm from its mean position and amplitude of 10 cm, is _____.
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- Q.1 (x)1 markIn biprism experiment, the distance of bright band from the central bright band is 1.2 cm. Without changing the experimental set-up, the distance of bright band from the central bright band will be _____.
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- Answer the following questions :Q.2 (i)1 markDefine centripetal force.
- Q.2 (ii)1 markWhy a detergent powder is mixed with water to wash clothes?
- Q.2 (iii)1 markWhat is the resistance of an ideal voltmeter?
- Q.2 (iv)1 markWrite the formula for torque acting on rotating current carrying coil in terms of magnetic dipole moment, in vector form.
- Q.2 (v)1 markWhat is binding energy of a hydrogen atom?
- Q.2 (vi)1 markWhat is surroundings in thermodynamics?
- Q.2 (vii)1 markIn a photoelectric experiment, the stopping potential is 1.5V. What is the maximum kinetic energy of a photoelectron?
- Q.2 (viii)1 markTwo capacitors of capacities and respectively are connected in series. Calculate the resultant capacity of the combination.
Section B
2 marks each · attempt any 8
- Q.32 marksExplain the change in internal energy of a thermodynamic system (the gas) by heating it.
- Q.42 marksExplain the construction of a spherical wavefront by using Huygens' principle.
- Q.52 marksDefine magnetization. State its SI unit and dimensions.
- Q.62 marksObtain the differential equation of linear simple harmonic motion.
- Q.72 marksA galvanometer has a resistance of and its full scale deflection current is 20 microampere . What resistance should be added to it to have a range 0-10 volt?
- Q.82 marksExplain Biot-Savart law.
- Q.92 marksWhat is a Light Emitting Diode? Draw its circuit symbol.
- Q.102 marksAn aircraft of wing span of 60 m flies horizontally in earth's magnetic field of T at a speed of 500 m/s. Calculate the e.m.f. induced between the tips of wings of aircraft.
- Q.112 marksDerive an expression for maximum speed of a vehicle moving along a horizontal circular track.
- Q.122 marksA horizontal force of 0.5N is required to move a metal plate of area with a velocity of , when it rests on thick layer of glycerin. Find the coefficient of viscosity of glycerin.
- Q.132 marksTwo tuning forks having frequencies 320 Hz and 340 Hz are sounded together to produce sound waves. The velocity of sound in air is 340 m/s. Find the difference in wavelength of these waves.
- Q.142 marksCalculate the change in angular momentum of electron when it jumps from third orbit to first orbit in hydrogen atom.
Section C
3 marks each · attempt any 8
- Q.153 marksA circular coil of wire is made up of 200 turns, each of radius 10 cm. If a current of 0.5A passes through it, what will be the magnetic field at the centre of the coil?
- Q.163 marksDefine photoelectric effect and explain the experimental set-up of photoelectric effect.
- Q.173 marksDefine the current gain and for a transistor. Obtain the relation between them.
- Q.183 marksDefine surface energy of the liquid. Obtain the relation between the surface energy and surface tension.
- Q.193 marksWhat is an isothermal process? Obtain an expression for work done by a gas in an isothermal process.
- Q.203 marksDerive an expression for equation of stationary wave on a stretched string. Show that the distance between two successive nodes or antinodes is .
- Q.213 marksDerive an expression for the impedance of an LCR circuit connected to an AC power supply. Draw phasor diagram.
- Q.223 marksCalculate the wavelength of the first two lines in Balmer series of hydrogen atom.
- Q.233 marksA current carrying toroid winding is internally filled with lithium having susceptibility . What is the percentage increase in the magnetic field in the presence of lithium over that without it?
- Q.243 marksThe radius of a circular track is 200 m. Find the angle of banking of the track, if the maximum speed at which a car can be driven safely along it is 25 m/sec.
- Q.253 marksProve the Mayer's relation :
- Q.263 marksAn alternating voltage is given by . Find (i) peak value of e.m.f. (ii) frequency of e.m.f. (iii) instantaneous value of e.m.f. at time t = 10 ms.
Section D
4 marks each · attempt any 3
- Q.274 marksWhat is a transformer? Explain construction and working of a transformer. Derive the equation for a transformer.
- Q.284 marksUsing the geometry of the double slit experiment, derive the expression for fringe width of interference bands.
- Q.29 (i)4 marksDistinguish between an ammeter and a voltmeter. (Two points each).
- Q.29 (ii)The displacement of a particle performing simple harmonic motion is rd of its amplitude. What fraction of total energy will be its kinetic energy?
- Q.304 marksDraw a neat labelled diagram of Ferry's perfectly black body. Compare the rms speed of hydrogen molecules at 227°C with rms speed of oxygen molecule at 127°C. Given that molecular masses of hydrogen and oxygen are 2 and 32 respectively.
- Q.314 marksDerive an expression for energy stored in a charged capacitor. A spherical metal ball of radius 15 cm carries a charge of . Calculate the electric field at a distance of 20 cm from the center of the sphere.