List of top Physics Questions asked in Haryana PMT

The root mean square velocity of the molecules in a sample of helium is $ \frac{5}{7} $ th that of the molecules in a simple of hydrogen. If the temperature of hydrogen sample is $ 0^{\circ} C $ then that of helium sample is about
An SHM is given by $y = 5 [\sin (3 \pi t) + \sqrt{3} \cos (3 \pi t)] $ What is the amplitude of the motion of $y$ in metre?
The fundamental frequency of a closed pipe is 220 Hz. If $\frac{1}{4}$ of the pipe is filled with water, the frequency of the first overtone of the pipe now is
A metal sphere cools at the rate of $ 3^{\circ} C/\min $ when its temperature is $ 50^{\circ} C $ . Its rate of cooling when its temperature is $ 40^{\circ} C $ and the temperature of surrounding is $ 25^{\circ} C $ is
The limbs of a U-tube are vertical and have internal diameters $0.5 \,cm$ and $1 \,cm$ respectively. If the tube contains water, what will be the difference in the surface level in the limbs? (Surface tension of water $= 72$ dyne/cm)
When the rate of emission of radiant heat from a body is less than the rate of absorption of radiant heat from surrounding then the temperature of body will
The distance between the sun and the earth be $r$, then the angular momentum of the earth around the sun is proportional to
A large number of liquid drops each of radius a coalesce to form a single spherical drop of radius $b$. The energy released in the process is converted into the kinetic energy of the big drop formed, the speed of the big drop is
A steel wire is $1 \,m$ long and has $ 1\, mm^2 $ area of cross-section. If it takes $200\, N$ to stretch thin wire by $1 \,mm$, how much force will be required to stretch a wire of same material and diameter from its normal length of $10\, m$ to a length of $10.02 \,m$?
For any two vectors A and B, if $A\cdot B =|A \times B |$ , the magnitude of C = A + B is equal to
A steel ball of mass $0.1 \,kg$ falls freely from a height of $10\, m$ and bounces to a height of $5.4 \,m$ from the ground. If the dissipated energy in this process is absorbed by the ball, the rise in its temperature is (specific heat of steel $=460\, J - kg { }^{-10} \,C^{-1}, g=10 \,m s^{-2}$)
A particle is projected with a velocity $v$ such that its range on the horizontal plane is twice the greatest height attained by it. The range of the projectile is (where $g$ is acceleration due to gravity)
A moving coil galvanometer is converted into an ammeter reading up to $0.03 \,A$ by connecting a shunt of resistance $4r$ across it. and into an ammeter reading up to $0.06 \,A$ when a shunt of resistance $r$ is connected across it. What is the maximum current which can be sent through this galvanometer if no shunt is used?
A pendulum has time period $T$ in air when it is made to oscillate in water, it acquired a time period $T =\sqrt{2} T$. The density of the pendulum bob is equal to (density of water $=1$ )
Two point charges $-q$ and $+q/2$ are situated at the origin and at the point $(a, 0, 0)$ respectively. The point along the $X$-axis where the electric field vanishes is
The radii of the inner and outer spheres of a condenser are $9\, cm$ and $10\, cm$ respectively. If the dielectric constant of the medium between the two spheres is $6$ and charge on the inner sphere is $18 \times 10^{-9}\, C$, then the potential of inner sphere will be, if the outer sphere is earthed
Air is filled at $60^{\circ} C$ in a vessel of open mouth. The vessel is heated to a temperature $T$ so that $1/4^\text{th}$ part of air escapes. Assuming the volume of the vessel remaining constant, the value of $T$ is
A hydrogen atom emits a photon corresponding to an electron transition from $n=5$ to $n=1$. The recoil speed of hydrogen atom is almost (mass of proton $\approx 1.6 \times 10^{-27} \,kg$ )
A bullet of mass $m$ moving with velocity $v$ strikes a suspended wooden block of mass $M$. If the block rises to a $S$ height the initial velocity of the block will be
A body falls freely from the top of a tower. It covers $36\%$ of the total height in the last second before striking the ground level. The height of the tower is
The fundamental frequency of a closed pipe is $220 \,Hz$. If $\frac{1}{4}$ of the pipe is filled with water, the frequency of the first overtone of the pipe now is
A battery is connected to a uniform resistance wire $AB$ and $B$ is earthed. Which one of the graphs below shows how the current density $J $ varies along $AB$?
A winding wire which is used to frame a solenoid can bear a maximum $10\, A$ current. If length of solenoid is $80\, cm$ and its cross-sectional radius is $3\, cm$ then required length of winding wire is $(B=0.2\, T)$
When two sinusoidal waves moving at right angle to each other superimpose, they produce
The reiation between electric field vector E, the displacement vector D and the polarization vector P for a dielectric placed in electric field E is given by