List of top Physics Questions

Find the resistance required to be connected to a galvanometer of resistance \(100 \, \Omega\) with a full scale deflection of 1mA into a voltmeter of range 1V.
The ratio of the angular speed of the minute hand to the second hand of a watch is?
Brewster's angle should lie between?
\( M^0 L T^{-1} \) is the dimension of ___________?
What is the maximum wavelength to excite a hydrogen atom?
How can we decrease the effective capacitance of a parallel plate capacitor?
Relation between the drift velocity and an electric field is ----?
The fundamental frequency of a string of length \( l \) is \( n \). The string is cut into 3 parts \( l_1, l_2, \) and \( l_3 \), each having fundamental frequency \( n_1, n_2, n_3 \). Then, what is the relationship between \( n_1, n_2, n_3 \)?
A body of mass 0.8kg moves with velocity \( v = 2x^2 + 2 \, \text{m/s} \). What is the work done during its motion from \( x = 0 \) to \( x = 2 \, \text{m} \)?
A solid sphere, hollow sphere, and solid cylinder start sliding from an inclined plane without rolling. Then the ratio of time taken by them to reach the ground is?
A liquid of density \( d \) is moving down in a vessel of height \( h \) with an acceleration \( a<g \). Then the pressure at the bottom is?
Tension of a rope when a man of mass \( m \) climbs up or down with an acceleration \( a<g \)?
De Broglie wavelength of a quantum photon having energy \( E \)?
A body of mass 0.8kg moves with velocity \( v = 2x^2 + 2 \, \text{m/s} \). What is the work done during its motion from \( x = 0 \) to \( x = 2 \, \text{m} \)?
If the half-life of \( D \) is 1500 years and \( B \) is 2000 years, what is the mean lifetime?
If the frequency of the cyclotron is doubled, then the radius becomes?
Relations between the speed of X-ray, gamma-ray, and UV rays when they travel in a vacuum.
A graph shows the velocity of an object as a function of time. Describe the motion of the object in detail, including its acceleration and displacement, at different points in time. What does the area under the curve represent?
Explain the difference between work and energy. Give an example where work is done on an object, but its kinetic energy does not change.

Consider the following statements: 
(i) Sound pressure changes with distance from the source 
(ii) Sound power is a property of the source 
(iii) Sound intensity is sound power per unit volume 
Choose the correct option from the following:
 

An electron with mass \( m \) and charge \( q \) is in the spin up state \[ \begin{pmatrix} 1 \\ 0 \end{pmatrix} \] at time \( t = 0 \). A constant magnetic field is applied along the \( y \)-axis, \( \mathbf{B} = B_0 \hat{j} \), where \( B_0 \) is a constant. The Hamiltonian of the system is \[ H = -\hbar \omega \sigma_y, \quad \text{where} \quad \omega = \frac{q B_0}{2m} < 0 \quad \text{and} \quad \sigma_y = \begin{pmatrix} 0 & -i \\ i & 0 \end{pmatrix}. \]
The minimum time after which the electron will be in the spin down state along the \( x \)-axis, i.e., \[ \frac{1}{\sqrt{2}} \begin{pmatrix} 1 \\ -1 \end{pmatrix}, \] is:
Which of the following statements is/are correct regarding across-track scanning sensor of an airborne optical imaging system?

Global Navigation Satellite System can be used for positioning and timing. The average geometric dilution of precision (GDOP) at a location is 1.0 and positional dilution of precision (PDOP) is 0.8. With the precision of the measurements being 300 m, the achieved precision of timing is __________ ns (Answer in integer). Consider the speed of light is \( 3 \times 10^8 \, {m/s} \)

The relativistic effect in Global Navigation Satellite System satellites has two parts, of which the first part is the time dilation due to the shift in the fundamental frequency of the satellite clock. The second part is due to the satellite’s semi-major axis and __________