List of top Physics Questions asked in Punjab PMET

Given two vectors $\vec{ A }=-\hat{ i }+2 \hat{ j }-3 \hat{ k }$ and $\vec{ B }=4 \hat{ i }-2 \hat{ j }+6 \hat{ k }$. The angle made by $(\vec{ A }+\vec{ B })$ with $x$-axis is
In Ramsden eye-piece the focal length of each lens is $F$ . The distance of the image formed by the objective lens from the eye lens is
A body is thrown vertically up with certain initial velocity. The potential and kinetic energies of the body are equal at a point $P$ in its path. If the same body is thrown with double the velocity upwards, the ratio of potential and kinetic energies of the body when it crosses the same point, is
The source is at some distance from an obstacle. Distance between obstacle and the point of observation is $b$ and wavelength of light is $\lambda$. Then the average distance of nth Fresnel zone will be at a distance from the point of observation
Curie-Weiss law is obeyed by iron
To make the frequency double of a spring oscillator, we have to
Consider a parallel plate capacitor of $10\,\mu F$ (micro-farad) with air filled in the gap between the plates. Now one-half of the space between the plates is filled with a dielectric of dielectric constant $4$, as shown in the figure. The capacity of the capacitor changes to
Two parallel plates have equal and opposite charge. When the space between them is evacuated, the electric field between the plates is $ 2 \times 10^5 \, Vm^{ - 1}$. When the space is filled with dielectric thel electric field becomes $1 \times 10^5 Vm^{ -1}$ . The dielectric constant of dielectric material is
The maximum intensity of fringes in Youngs experiment is $I$. If one of the slit is closed then the intensity at that place becomes $I_{0}$ . Which of the following relation is true?
The dimensions of $\frac{e^{2}}{4 \pi \varepsilon_{0} h c'}$, where $e, \varepsilon_{0}, h$ and $c$ and $c$ are electronic charge, electric permittivity Planck's constant and velocity of light in vacuum respectively
A tuning fork of frequency $340\,Hz $ is vibrated just above the tube of $120\,cm $ height. Water is poured slowly in the tube. What is the minimum height of water necessary for the resonance? (speed of sound in air $ =340\,m/s $ )
A stone is dropped from a height $h$ simultaneously, another stone is thrown up from the ground which reaches a height $4h$ . The two stones cross each other after time
A simple telescope consisting of an objective of focal length $60\, cm$ and a single eye lens of focal length $5\, cm$ is focussed on a distant object in such a way that parallel rays comes out from the eye lens. If the object subtends an angle $2^{\circ}$ at the objective, the angular width of the image is
A coin is dropped in a lift. It takes time $t_1$ to reach the floor when lift is stationary. It takes time $t_2$ when lift is moving up with constant acceleration. Then
The energy of an electron in an excited hydrogen atom is $ -3.4\,eV $ . Its angular momentum is
The difference between the apparent frequency of a source of sound as perceived by the observer during its approach and recession is $2\%$ of the frequency of the source. If the speed of sound in air is $ 300\,ms^{-1}$ , the velocity of the source is
A short linear object of length $b$ lies along the axis of a concave mirror of focal length $f$ at a distance $u$ from the pole of the mirror, what is the size of image?
A count rate metre shows a count of $240/\min$ from a given radioactive source later the metre shows a count rate of $30/\min$. The half-life of the source is
A copper wire of length $1\, m$ and radius $1\, mm$ is joined in series with an iron wire of length $2\, m$ and radius $3\, mm$ and a current is passed through the wires. The ratio of the current density in the copper and iron wires is
A cane filled with water is revolved in a vertical circle of radius $4\, m$ and the water does not fall down. What must be the maximum period of revolution?
A body of mass $m$ moving with velocity $v$ makes a head-on collision with another body of mass $2\, m$ which is initially at rest. The loss of kinetic energy of the colliding body (mass $m$ ) is
When a wire is stretched and its radius becomes $\frac {r}{2}$. then its resistance will be
Two identical induction coils each of inductance $L$ joined in series are placed very close to each other such that the winding direction of one is exactly opposite to that of the other, what is net inductance?
A beaker is completely filled with water at $4^{\circ} C$. It will overflow if
An ice block contains a glass ball. When the ice melts within the water containing vessel, the level of water: