List of top Geophysics Questions

For a rolling solid sphere on an incline of $30^\circ$, what is its acceleration $a$ in terms of gravity $g$?
What is the quality factor ($Q$) of an LCR circuit defined in terms of resonant frequency and bandwidth?
In a P-N junction diode, which terminal is connected to the P-side during forward biasing?
How does the orbital period of a satellite change as its distance from the Earth's center increases?
What is the relation between the polarizing angle and the refractive index in Brewster’s Law?
Which thermodynamic process must occur "infinitesimally slowly" to remain reversible?
According to Wien's displacement law, how is the surface temperature of a star related to its maximum intensity wavelength?
For a series LCR circuit, what is the formula for the phase angle between current and emf?
What is the Compton shift for a photon backscattered at 180 degrees?
Calculate the efficiency of a Carnot engine operating between the steam point (373 K) and ice point (273 K).
Which Maxwell's equation represents Gauss's Law in Magnetostatics?
What is the shape of the air film formed in the Newton's ring experiment?
X- rays of wavelength 15 pm are scattered from a target. The wavelength of the X-rays scattered through 60° is (Given compton wavelength = 2.426 pm)
In Photo- electric effect
(A) There is no time interval (very small ~ 10⁻⁹s) between incidence of light and emissions of photo electrons.
(B) Higher the frequency of light, more is the kinetic energy of photo electrons emitted.
(C) A bright light yields more photo-electrons than dim light.
(D) Blue light emits slower electrons than red light.
Choose the correct answer from the options given below:
The condition for bright ring in the Newton's Ring arrangement is (where 't' is thickness of film, m is order and \(\lambda\) is wavelength):
The Rayleigh Jean's Law,
(A) agrees well with experimental results at low frequencies.
(B) agrees well with experimental results at longer. wavelengths.
(C) shows ultra-violet catastrophe at higher frequencies.
(D) agrees well with experimental results at higher frequencies.
Choose the correct answer from the options given below:
The energy radiated per minute from the filament of an incandescent lamp at 2000 K, surface area \( 4 \times 10^{-5} \) m² and relative emittance is 0.85, will be (Given Stefan's constant \( \sigma = 5.7 \times 10^{-8} \) Jm⁻²s⁻¹K⁻⁴)
Match List-I with List-II

\[ \begin{array}{|l|l|} \hline \textbf{List-I} & \textbf{List-II} \\ \hline (A) \; \text{Circular Fringes} & (I) \; \text{Nicol prism} \\ (B) \; \text{Straight parallel and equidistant interference pattern} & (II) \; \text{Newton's Ring experiment} \\ (C) \; \text{Polarizer} & (III) \; \text{Interference in wedge-shaped film} \\ (D) \; \text{E-ray and O-ray travel with same speed} & (IV) \; \text{Optic axis} \\ \hline \end{array} \]
Choose the correct answer from the options given below:
Which of following is true in a LCR circuit?
(A) In purely inductive circuit (R = 0), Quality factor is infinite.
(B) Resistance 'R' is alone responsible for damping of oscillations.
(C) Discharge of capacitor is not oscillatory in character.
(D) Q-factor is measure of sharpness of resonance in case of a driven oscillator.
Choose the correct answer from the options given below:
Which of the following is not a characteristic of a laser light?
In order to produce LASER, the correct sequence of processes given below will be
(A) Pumping
(B) Population inversion
(C) Stimulated emission
(D) Light Amplification
Choose the correct answer from the options given below:
Which of following is correct form of first TdS equation ?
Sunlight is reflected from a material. The reflected light is 100% polarized at a certain instant. Assuming refractive index of material equal to 1.732, the angle between the sun and the horizon at that instant is
At a temperature of 47°C the thermal voltage is (Given value of Boltzmann's constant = 1.38 x10\(^{-23}\) joule/°K):
A wave of frequency 500 Hz is travelling with a velocity 1000 m/s. How far are two points situated in wave whose displacement differ in phase by \( \frac{\pi}{3} \)?