Physics Test-1...

Light of wavelength \(600 {~nm}\) is incident normally on a slit of width \(0.2 {~mm}\). The angular width of central maxima in the diffraction pattern is:

Calculate the displacement current between square plates in which electric field changes at the rate of \(5 \times 10^{12} {Vm}^{-1} {~s}^{-1}\). Side of plates is \(2.0 {~cm}\).

Two similar rectangular coils \(\mathrm{A}\) and \(\mathrm{B}\) are placed in the uniform magnetic field of intensity \(\mathrm{B}\). The ratio of the number of turns and the current in the coil \(\mathrm{A}\) to coil \(\mathrm{B}\) is \(1: 2\) and \(2: 1\) respectively, if the orientation of both the coils in the magnetic field is same then the ratio of the torque experienced by the coil \(\mathrm{A}\) to coil \(\mathrm{B}\) will be:

A stone is thrown upward with a speed of u, find maximum height it can get with this speed. (given g is the gravitational acceleration)

\(5.5 \times 10^{-4}\) magnetic flux lines are passing through a coil of resistance \(10\) ohm and number of turns \(1000\) . If the number of flux lines reduces to \(5 \times 10^{-5}\) in \(0.1~ \mathrm{sec}\), find the current induced in the coil

Electromagnetic waves are produced by:

A rod of length \(l\) and radius \(\mathrm{r}\) is joined to a rod of length \(\frac l2\) and radius \(\frac r2\) of same material. The free end of small rod is fixed to a rigid base and the free end of larger rod is given a twist of \(\theta\), the twist angle at the joint will be:

Mayank is doing an experiment in a lab he suspended \(5~\mathrm{Kg}\) mass by string making angles \(60^{\circ}\) and \(30^{\circ}\) with horizontal as shown in the figure. Find the tension \(T_{1}\) and \(T_{2}\). (Take \(g=10 \mathrm{~m} / \mathrm{s}^{2}\))

A simple pendulum is at rest. After sometime \(v\) velocity is given to the bob of the pendulum. So the potential energy at the highest point will be? (\(m\) is mass of bob, \(h\) is maximum height):

The output of half wave rectifier is:

A screw gauge has the least count of 0.01 mm and there are 50 divisions in its circular scale. The pitch of the screw gauge is:

What is the shortest wavelength present in the Paschen series of spectral lines?

When photons of wavelength λ1 are incident on an isolated sphere, the corresponding stopping potential is found to be V. When photons of wavelength λ2 are used, the corresponding stopping potential was thrice that of the above value. If light of wavelength λ3 is used then find the stopping potential for this case.

A body is executing simple harmonic motion. When its displacements from the mean position are \(4 \mathrm{~cm}\) and \(5 \mathrm{~cm}\), then it has velocities of \(10 \mathrm{~cm} / \mathrm{second}\) and \(8 \mathrm{~cm} / \mathrm{second}\) respectively. The time period of this simple harmonic motion is: