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

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

Concept: Definition of M.I., K.E. of Rotating Body

Appears in 1 question paper

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

Concept: Alpha-particle Scattering and Rutherford’S Nuclear Model of Atom

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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 10^{8} m/s,

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

Concept: Photoelectric Effect - Hertz’S Observations

Appears in 1 question paper

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

- distribution of mass only.
- angular speed only.
- distribution of mass and angular speed.
- angular acceleration only.

Concept: Definition of M.I., K.E. of Rotating Body

Appears in 1 question paper

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

a. [L^{1}M^{0}T^{0}]

b. [L^{2}M^{1}T^{0}]

c. [L^{-1}M^{1}T^{-2}]

d. [L^{3}M^{-1}T^{-2}]

Concept: Newton’s Law of Gravitation

Appears in 1 question paper

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`

Concept: Electromagnetic Induction

Appears in 1 question paper

Draw a block diagram of generalized communication system.

Concept: Elements of a Communication System

Appears in 3 question papers

The magnetic flux through a loop varies according to the relation Φ = 8t^{2} + 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.

Concept: Electromagnetic Induction

Appears in 1 question paper

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

(A) less than two seconds

(B) equal to two seconds

(C) greater than two seconds

(D) very much greater than two seconds

Concept: Periodic and Oscillatory Motions

Appears in 1 question paper

Draw a neat labelled diagram of conical pendulum. State the expression for its periodic time in terms of length.

Concept: Periodic and Oscillatory Motions

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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.

Concept: Periodic and Oscillatory Motions

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

Concept: Study of Vibrations in a Finite Medium

Appears in 1 question paper

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]

Concept: Photoelectric Effect - Hertz’S Observations

Appears in 1 question paper

Ionosphere mainly consists of _______.

(A) positive ions and electrons

(B) water vapour and smoke

(C) ozone layer

(D) dust particles

Concept: Photoelectric Effect - Hertz’S Observations

Appears in 1 question paper

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

Concept: Photoelectric Effect - Hertz’S Observations

Appears in 1 question paper

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

Concept: Interference of Light

Appears in 1 question paper

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.

Concept: Applications of Gauss’s Law

Appears in 1 question paper

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

- 0.94
- 0.84
- 0.74
- 0.64

Concept: Interference of Light

Appears in 1 question paper

Draw neat, labelled diagrams for the modes of vibration of a stretched string in second harmonic and third harmonic.

Concept: Study of Vibrations in a Finite Medium

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Explain the formation of energy band diagram in case of conductor and semiconductor.

Concept: Energy Bands in Solids

Appears in 1 question paper