# Question Bank Solutions for HSC Science (General) 12th Board Exam - Maharashtra State Board - Physics

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Obtain an expression for total kinetic energy of a rolling body in the form

1/2 (MV^2)[1+K^2/R^2]

[0.03] Angular Momentum
Chapter: [0.03] Angular Momentum
Concept: Definition of M.I., K.E. of Rotating Body

With the help of a neat labelled diagram, describe the Geiger- Marsden experiment

[0.18] Atoms, Molecules and Nuclei
Chapter: [0.18] Atoms, Molecules and Nuclei
Concept: Alpha-particle Scattering and Rutherford’S Nuclear Model of Atom

The photoelectric work function for a metal surface is 2.3 eV. If the light of wavelength 6800A is incident on the surface of metal, find threshold frequency and incident frequency. Will there be an emission of photoelectrons or not?

[Velocity of light c = 3 x 108 m/s,

Planck’s constant, h = 6.63 * 10-34 Js ]

[0.17] Electrons and Photons
Chapter: [0.17] Electrons and Photons
Concept: Photoelectric Effect - Hertz’S Observations

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.
[0.03] Angular Momentum
Chapter: [0.03] Angular Momentum
Concept: Definition of M.I., K.E. of Rotating Body

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

a. [L1M0T0]

b. [L2M1T0]

c. [L-1M1T-2]

d. [L3M-1T-2]

[0.02] Gravitation
Chapter: [0.02] Gravitation
Concept: Newton’s Law of Gravitation

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)

[0.02] Gravitation
Chapter: [0.02] Gravitation
Concept: Newton’s Law of Gravitation

Electric field intensity in free space at a distance ‘r’ outside the charged conducting sphere of radius ‘R’ in terms of surface charge density ‘ a ’ is............................

(a)sigma / in_0[R/r]^2

(b)in_0/sigma[R/r]^2

(c)R/r[sigma/in_0]^2

(d)R/sigma[r/in_0]^2

[0.12] Electromagnetic Induction
Chapter: [0.12] Electromagnetic Induction
Concept: Electromagnetic Induction

Electric field intensity in free space at a distance ‘r’ outside the charged conducting sphere of radius ‘R’ in terms of surface charge density ‘ a ’ is............................

(a)sigma / in_0[R/r]^2

(b)in_0/sigma[R/r]^2

(c)R/r[sigma/in_0]^2

(d)R/sigma[r/in_0]^2

[0.16] Electromagnetic Inductions
Chapter: [0.16] Electromagnetic Inductions
Concept: Electromagnetic Induction

Draw a block diagram of generalized communication system.

[0.2] Communication Systems
Chapter: [0.2] Communication Systems
Concept: Elements of a Communication System

The magnetic flux through a loop varies according to the relation Φ = 8t2 + 6t + C, where ‘C’ is constant, 'Φ' is in milliweber and 't' is in second. What is the magnitude of induced e.m.f. in the loop at t = 2 seconds.

[0.16] Electromagnetic Inductions
Chapter: [0.16] Electromagnetic Inductions
Concept: Electromagnetic Induction

The magnetic flux through a loop varies according to the relation Φ = 8t2 + 6t + C, where ‘C’ is constant, 'Φ' is in milliweber and 't' is in second. What is the magnitude of induced e.m.f. in the loop at t = 2 seconds.

[0.12] Electromagnetic Induction
Chapter: [0.12] Electromagnetic Induction
Concept: Electromagnetic Induction

A seconds pendulum is suspended in an elevator moving with constant speed in downward direction. The periodic time (T) of that pendulum is _______.

[0.04] Oscillations
Chapter: [0.04] Oscillations
Concept: Periodic and Oscillatory Motions

The periodic time of a linear harmonic oscillator is 2π second, with maximum displacement of 1 cm. If the particle starts from extreme position, find the displacement of the particle after π/3  seconds.

[0.04] Oscillations
Chapter: [0.04] Oscillations
Concept: Periodic and Oscillatory Motions

Show that all harmonics are present on a stretched string between two rigid supports.

[0.08] Stationary Waves
Chapter: [0.08] Stationary Waves
Concept: Study of Vibrations in a Finite Medium

The photoelectric current in a photoelectric cell can be reduced to zero by a stopping potential of 1.8 volt. Monochromatic light of wavelength 2200Å is incident on the cathode. Find the maximum kinetic energy of the photoelectrons in joules. [Charge on electron = 1.6 x 10-19 C]

[0.17] Electrons and Photons
Chapter: [0.17] Electrons and Photons
Concept: Photoelectric Effect - Hertz’S Observations

Ionosphere mainly consists of _______.

[0.2] Communication Systems
Chapter: [0.2] Communication Systems
Concept: Elements of a Communication System

Draw a neat labelled circuit diagram of experimental arrangement for study of photoelectric effect.

[0.17] Electrons and Photons
Chapter: [0.17] Electrons and Photons
Concept: Photoelectric Effect - Hertz’S Observations

A parallel beam of monochromatic light is incident on a glass slab at an angle of incidence 60o. Find the ratio of width of the beam in the glass to that in the air if refractive index of glass is 3/2.

[0.11] Interference and Diffraction
Chapter: [0.11] Interference and Diffraction
Concept: Interference of Light

A 36 cm long sonometer wire vibrates with frequency of 280 Hz in fundamental mode, when it is under tension of 24.5 N. Calculate linear density of the material of wire.

[0.12] Electrostatics
Chapter: [0.12] Electrostatics
Concept: Applications of Gauss’s Law

The co-efficient of reflection of an opaque body is 0.16. Its co-efficient of emission is ........................................

1. 0.94
2. 0.84
3. 0.74
4. 0.64
[0.11] Interference and Diffraction
Chapter: [0.11] Interference and Diffraction
Concept: Interference of Light
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