List of top Physics Questions asked in JKCET

A rectangular coil, of sides $2 \,cm$ and $3\, cm$ respectively, has $10$ turns in it. It carries a current of $1 \,A$, and is placed in a uniform magnetic field of $0.2 \,T$ in such a manner that its plane makes an angle $60^{\circ}$ with the field direction. The torque on the loop is
What is the order of the reverse saturation current before break down in a Zener diode?
The molecules in an ideal gas at $27^{\circ} C$ have a certain mean velocity. At what approximate temperature, will the mean velocity be doubled?
A uniform rod of length $L$ and mass $M$ is held vertical, with its bottom end pivoted to the floor. The rod falls under gravity, freely turning about the pivot. If acceleration due to gravity is $g$, what is the instantaneous angular speed of the rod when it makes an angle $60^{\circ}$ with the vertical?
What are the dimensions of electrical conductivity?
Which of the following optical phenomena is involved in the propagation of light in an optical fibre?
Which of the following is false for interference of light?
The power of a convex lens is $2 $ dioptre. Its power is to be reduced to $1.5$ dioptre, by putting another lens in combination with it. Which of the following lenses will serve the purpose?
Which of the following is a true statement?
In a single-slit diffraction experiment, the width of the slit is reduced by half. Which of the following needs to be done if the width of the central maxima has to remain the same?
In television transmission what type of modulation is used ?
A bar magnet is placed upright on a floor (so that the axis of the magnet is vertical). A copper ring is held above the magnet, with its plane horizontal and released. The copper ring falls in such a manner that its axis always coincides with that of the magnet. What will be the acceleration with which the ring will fall? Acceleration due to gravity is $ 10\,m/s^{2} $ .
Which of the following is true for the minimum angular separation of two stars, $\Delta \theta_{\min }$ can be resolved by a telescope? In the following aperture is the diameter of the objective
Which of the following laws of thermodynamics forms the basis for the definition of temperature?
Which of the following is the correct arrangement of the electromagnetic spectrum in the increasing order of frequency ?
Spherical wave fronts, emanating from a point source, strike a plane reflecting surface. What will happen to these wave fronts, immediately after reflection ?
The de-Broglie wavelength of a particle is
A short solenoid of radius $a$, number of turns per unit length $n_{1}$ and length $L$ is kept coaxially inside a very long solenoid of radius $b$, number of turns per unit length $n_{2}$. What is the mutual inductance of the system?
Which of the two (i) compressing a gas isothermally until its volume is reduced by half (ii) compressing the same gas adiabatically until its volume is reduced by half, will require more work to be done?
A certain vector in the $x y$ plane has an $x$-component of $12\, m$ and a $y$-component of $8\, m$. It is then rotated in the $x-y$ plane so that its $x$-component is halved. Then ifs new $y$-component is approximately
Which of the following is the correct Kirchhoff's loop rule?
An electron and a proton, both having the same kinetic energy, enter a region of uniform magnetic field, in a plane perpendicular to the field. If their masses are denoted by $m_{e}$ and $m_{p}$ respectively, then the ratio of the radii (electron to proton) of their circular orbits is
What is the resonance frequency of a driven $LCR$ oscillator?
A cheetah, weighing $150 \,kg$, chases a deer, weighing $30 \, kg$, in a straight path. The speed of the cheetah is $20 \,m / s$ and that of the deer is $25 m / s$. The approximate speed of the centre of mass of the pair is
Consider a copper wire of length $L$, cross-sectional area $A$. It has $n$ number of free electrons per unit volume. Which of the following is the correct expression of drift velocity of the electrons when the wire carries a steady current $I$?