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Question Paper - Physics 2014 - 2015-H.S.C-12th Board Exam Maharashtra State Board (MSBSHSE)

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Marks: 70
Q: 1 | Select and write the most appropriate answer from the given alternatives for each sub-question :[7]
Q: 1.1[1]

The period of a conical pendulum in terms of its length (l), semivertical angle (θ) and acceleration due to gravity (g) is:

(a)`1/(2pi)sqrt((l costheta)/g)`

(b)`1/(2pi)sqrt((l sintheta)/g)`

(c)`4pisqrt((lcostheta)/(4g))`

(d)`4pisqrt((l tantheta)/g)`

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Q: 1.2[1]

The kinetic energy of a rotating body depends upon................

  1. distribution of mass only.
  2. angular speed only.
  3. distribution of mass and angular speed.
  4. angular acceleration only.
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Q: 1.3[1]

If the metal bob of a simple pendulum is replaced by a wooden bob of the same size, then its time period will.....................

  1. increase
  2. remain same
  3. decrease
  4. first increase and then decrease.
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Q: 1.4[1]

The graph between applied force and change in the length of wire within elastic limit is a.......................

  1. straight line with positive slope.
  2. straight line with negative slope.
  3. curve with positive slope.
  4. curve with negative slope.
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Q: 1.5[1]

When longitudinal wave is incident at the boundary of denser medium, then............................

  1. compression reflects as a compression.
  2. compression reflects as a rarefaction.
  3. rarefaction reflects as a compression.
  4. longitudinal wave reflects as transverse wave.
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Q: 1.6[1]

The dimensions of universal gravitational constant are........................

a. [L1M0T0]

b. [L2M1T0]

c. [L-1M1T-2]

d. [L3M-1T-2]

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Q: 1.7[1]

Two copper spheres of radii 6 cm and 12 cm respectively are suspended in an evacuated enclosure. Each of them are at a temperature 15°C above the surroundings. The ratio of their rate of loss of heat is.................

  1. 2:1
  2. 1:4
  3. 1:8
  4. 8:1
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Q: 2 | Attempt any Six[12]
Q: 2.1[2]

In circular motion, assuming `bar v = bar w * bar r` , obtain an expression for the resultant acceleration of a particle in terms of tangential and radial component.

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Q: 2.2[2]

Explain why an astronaut in an orbiting satellite has a feeling of weightlessness.

Discuss the weightlessness experienced by an astronaut in an orbiting satellite.

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Q: 2.3[2]
Q: 2.3.1[1]

State the theorem of parallel axes about moment of inertia.

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Q: 2.3.2[1]

State the theorem of perpendicular axes about moment of inertia.

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Q: 2.4[2]

State Wein's displacement law

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Q: 2.4.1[1]

State Wein's displacement law

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Q: 2.4.2[1]

State the First law of thermodynamics.

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Q: 2.5[2]

A particle in S.H.M. has a period of 2 seconds and amplitude of 10 cm. Calculate the acceleration when it is at 4 cm from its positive extreme position.

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Q: 2.6[2]

The surface tension of water at 0°C is 75-5 dyne/cm. Calculate surface tension of water at 25°C.

(∝ for water = 2*7x1O-3/°C)

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Q: 2.7[2]

The spin dryer of a washing machine rotating at 15 r.p.s. slows down to 5 r.p.s. after making 50 revolutions. Find its angular acceleration.

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Q: 2.8[2]

Calculate the period of revolution of Jupiter around the Sun. The ratio of the radius of Jupiter’s orbit to that of the Earth’s orbit is 5.

(Period of revolution of the Earth is 1 year)

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Q: 3 | Attempt any Three[9]
Q: 3.1[3]

Derive an expression for excess pressure inside a drop of liquid.

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Q: 3.2[3]

Explain what is Doppler effect in sound and state its any ‘four’ applications.

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Q: 3.3[3]

Calculate the average molecular kinetic energy :

(a) per kilomole, (b) per kilogram, of oxygen at 27°C.

(R = 8320 J/k mole K, Avogadro's number = 6*03 x 1026 molecules/K mole)

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Q: 3.4[3]

A uniform steel rod of 5 mm2 cross section is heated from 0°C to 25°C. Calculate the force which must be exerted to prevent it from expanding. Also calculate strain.

(α for steel = 12 x 10-6/°C and γ for steel = 20 x 101ON/m2)

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Q: 4 | Attempt any One[7]
Q: 4.1[7]

What are forced vibrations and resonance? Show that only odd harmonics are present in an air column vibrating in a pipe closed at one end.

A stretched wire emits a fundamental note of frequency 256 Hz. Keeping the stretching force constant and reducing the length of wire by 10 cm, the frequency becomes 320 Hz. Calculate the original length ofw'ire.

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Q: 4.2[7]

Obtain an expression for potential energy of a particle performing simple harmonic motion. Hence evaluate the potential energy

  1. at mean position and
  2. at extreme position.
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Q: 5[7]
Q: 5.1[1]
Q: 5.2[1]

Instrument which can measure terminal potential difference as well as electro motive force (e.m. f.) is................................

  1. Wheatstone’s meter bridge
  2. Voltmeter
  3. Potentiometer
  4. Galvanometer
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Q: 5.3[1]

If the frequency of incident light falling on a photosensitive material is doubled, then the kinetic energy of the emitted photoelectron will‘be........................................

  1. same as its initial value
  2. two times its initial value
  3. more than two times its initial value
  4. less than two times its initial value
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Q: 5.4[1]

Linear momentum of an electron in Bohr orbit of H-atom (principal quantum number n) is proportional to..................................

  1. 1/n2
  2. 1/n
  3. n
  4. n2
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Q: 5.5[1]

In a semiconductor, acceptor impurity is.................................

  1. antimony
  2. indium
  3. phosphorous
  4. arsenic
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Q: 5.6[1]

The power radiated by linear antenna of length T is proportional to........................

(λ= wavelength)

  1. `lambda/ l`
  2. `[lambda/l]^2`
  3. `l/lambda`
  4. `[l/lambda]^2`
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Q: 5.7[1]

The numerical aperture of objective of a microscope is 0.12. The limit of resolution, when light of wavelength 6000A is used to view an object is.......................

  1. 0.25 * 10-7m
  2. 2.5 * 10-7m
  3. 25 * 10-7m
  4. 250 * 10-7m

 

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Q: 6 | Attempt any Six[12]
Q: 6.1[2]

What is a polaroid? State its 'two' uses.

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Q: 6.2[2]

Draw a neat and labelled diagram of suspended coil type moving coil galvanometer.

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Q: 6.3[2]

Define : (1) Magnetization and (2) Magnetic intensity.

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Q: 6.4[2]

Draw a block diagram of generalized communication system.

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Q: 6.5[2]

A solenoid 3.142m long and 5.0 cm in diameter has two layers of windings of 500 turns each and carries a current of 5A. Calculate the magnetic induction at its centre along the axis.

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Q: 6.6[2]

A circular coil of 300 turns and average area 5 * 10-3m2 carries a current of 15A. Calculate the magnitude of magnetic moment associated with the coil.

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Q: 6.7[2]
Q: 6.8[2]

An electron is orbiting in 5th Bohr orbit. Calculate ionisation energy for this atom, if the ground state energy is -13.6 eV.

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Q: 7 | Attempt any Three[9]
Q: 7.1[3]

Obtain an expression for the radius of Bohr orbit for H-atom.

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Q: 7.2[3]

What are α and β parameters for a transistor? Obtain a relation between them.

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Q: 7.3[3]

Two metal spheres having charge densities 5μC/m2 and -2μC/m2 with radii 2mm and  1mm respectively are kept in a hypothetical closed surface. Calculate total normal electric induction over the closed surface.

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Q: 7.4[3]

The threshold wavelength of silver is 3800Å. Calculate the maximum kinetic energy in eV of photoelectrons emitted, when ultraviolet light of wavelength 2600Å falls on it.

(Planck’s constant, h =6.63 x 1O-34J.s.,

Velocity of light in air, c = 3 x 108 m / s)

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Q: 8 | Attempt any One[7]
Q: 8.1[7]

Obtain an expression for e.m.f. induced in a coil rotating with uniform angular velocity in a uniform magnetic field. Show graphically the variation of e.m.f. with time (t).

Resistance of a potentiometer wire is 0.1Ω/cm. A cell of e.m.f 1.5V is balanced at 300 cm on this potentiometer wire. Calculate the current and balancing length for another cell of e.m.f. 1.4V on the same potentiometer wire.

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Q: 8.2[7]

Describe biprism experiment to calculate the wavelength of a monochormatic light. Draw the necessary ray diagram.

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If the critical angle of a medium is sin-1[3/5], find the polarising angle.

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