List of top Geophysics Questions asked in Common University Entrance Test

Match List I with List II:

List I	List II
A. Fraunhofer Diffraction	I. Interaction of the light waves from two different wave fronts.
B. Fresnel Diffraction	II. The distance between the source and the screen are effectively at infinite distance.
C. Interference of Light	III. It’s a phenomenon in which the wave vibrations are restricted to a particular direction in a plane.
D. Polarization of Light	IV. The source and screen or both are at finite distances from the aperture or obstacle.

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For Fresnel half period zones:
(A) The amplitude of disturbance is directly proportional to the area of the zone.
(B) The radii of half period zones are directly proportional to the square root of the natural number.
(C) The area of each zone is directly proportional to the wavelength of the light.
(D) The radii of half period zones are directly proportional to the square root of the wavelength of the light.
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In order to introduce a phase difference of $\pi/2$ in a Quarter wave plate, the thickness of the crystal should have a value of... (Given: wavelength = $5893 \times 10^{-10} \, \text{m}$, refractive index for O-ray is $1.65836$ and refractive index for E-ray is $1.48641$)

In the case of a rolling solid sphere on an inclined plane making an angle of $30^\circ$ with the horizontal plane, the acceleration of the sphere rolling down the plane is (where acceleration due to gravity is $9.8 \, \text{m/s}^2$):

The inter-molecular distance between two atoms of a hydrogen molecule is $0.77 \, \text{\AA}$, and the mass of a proton is $1.67 \times 10^{-27} \, \text{Kg}$. The moment of inertia of a molecule is:

A Fraunhofer diffraction pattern is produced by a circular aperture of radius $0.05 \, \text{cm}$ at the focal plane of a convex lens of focal length $20 \, \text{cm}$. If the wavelength $\lambda = 5 \times 10^{-5} \, \text{cm}$, the radius of the first dark ring is:

In a Fraunhofer N-slit diffraction experiment, a grating has $5000$ lines/cm, and monochromatic light of wavelength $5 \times 10^{-5}$ cm is used. What is the highest order spectrum that may be observed?

In an LCR circuit, the current and emf differ in phase by $\Phi$. The value of $\Phi$ is:

If the resonance frequency of an acoustic system is 300Hz and the half-power frequencies are 150Hz and 450Hz, the quality factor is:

Brewster's law can be expressed as:

Which statements are correct for a P–N junction diode?
(A) For forward bias, P-side is connected to the positive terminal and N-side to the negative terminal of the battery.
(B) For forward bias, P-side is connected to the negative terminal and N-side to the positive terminal.
(C) For reverse bias, P-side is connected to the negative terminal and N-side to the positive terminal.
(D) For reverse bias, P-side is connected to the positive terminal and N-side to the negative terminal.
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Clausius-Clapeyron’s latent heat equation is represented as:

X-ray of wavelength 10.0 pm are scattered from a target in a Compton exper iment. If the X-rays are scattered through \(45\degree\), the scattered wavelength is

Which of the following statements are correct for the Second Law of Thermodynamics?
(A) It is impossible to derive a continuous supply of energy from a body by cooling it below the temperature of its surroundings.
(B) It is possible to derive a continuous supply of energy from a body by cooling it below the temperature of its surroundings.
(C) It is impossible for a self-acting machine, unaided by any external agency, to convey heat from a body at lower temperature to another body at higher temperature.
(D) It is possible for a self-acting machine, unaided by any external agency, to convey heat from a body at lower temperature to another body at higher temperature.
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10g of water at \(100\degree C \)is converted into steam at the same temperature. If the latent heat of steam is 540cal/g, the change in entropy is

Higher-energy photons are scattered from electrons initially at rest. Assume the photons are backscattered ($\theta = 180^\circ$) and their energies are much higher than the electron's rest mass energy. The wavelength shift will be \[ \frac{h}{m_e c} = 2.43 \times 10^{-12} \, \text{m}: \]

Match List I with List II:

List I	List II
(A) (∂S/∂P)T	(I) (∂P/∂T)V
(B) (∂T/∂V)S	(II) (∂V/∂S)P
(C) (∂T/∂P)S	(III) -(∂V/∂T)P
(D) (∂S/∂V)T	(IV) -(∂P/∂S)V

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Which of the following is true for a reversible process

If the radiation emitted by a star has a maximum intensity at a wavelength of 446 nm, its surface temperature is approximately:

Which of the following statements are true for Compton effect?
(A) The wavelength of the scattered X-rays is larger than that of the incident X-rays.
(B) The change in wavelength depends on the intensity of the incident X-rays.
(C) The change in wavelength depends on the scattering angle.
(D) The wavelength of the scattered X-rays is smaller than that of the incident X-rays
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Match List I with List II:

List I	List II
(A) The linear momentum of the system remains constant	(IV) The net external force acting on a system of particles is zero
(B) The angular momentum of the system remains constant	(III) The external torque acting on a system of particles is zero
(C) Inertial frame	(I) The frames relative to which an unaccelerated body appears unaccelerated
(D) Non-inertial frame	(II) The frames relative to which an unaccelerated body appears accelerated

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Match List I with List II:

LIST I	LIST II
A. Maxwell's First Equation	I. Modified Ampere's Law
B. Maxwell's Second Equation	II. Faraday's Laws of Electromagnetic Induction
C. Maxwell's Third Equation	III. Gauss Law in Electrostatics
D. Maxwell's Fourth Equation	IV. Gauss Law in Magnetostatics

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The efficiency of Carnot’s engine working between the steam point and the ice point is:

The shape of air film formed between the plano-convex lens and the glass slab in Newton’s ring experiment is