List of top Physics Questions asked in Haryana PMT

Two radioactive substances $A$ and $B$ have decay constants 5 $\lambda$, and $\lambda$ respectively. At $t\, =\, 0$, they have the same number of nuclei. The ratio of number of nuclei of $A$ to those of $B$ will be $(1/e^2)$ after a time
The objectives with large apertures are used in telescopes for
If both the mass and radius of earth decrease by $1\%$, the value of (I) acceleration due to gravity would increase by $1\%$ (II) acceleration due to gravity would decrease by $1\%$ (III) escape velocity from earth's surface would decrease by $1 \%$ (IV) the gravitational potential energy of a body on earth's surface will remain unchanged
The angular speed of a body changes from $\omega_1$ to $ \omega_2$ without applying a torque, but due to change in moment of inertia. The ratio of radii of gyration in the two cases is
A small body of mass $m$ slides without friction from the top of a hemisphere of radius $r$. At what height will the body be detached from the centre of the hemisphere?
A faulty thermometer has its fixed point marked as $5^{\circ}$ and $95^{\circ}$. The temperature of a body as measured by the faulty thermometer is $59^{\circ}$. The correct temperature of the body on Celsius scale is
How long will a passenger sitting at the window of a train travelling at a speed of 54 km$h^{-1}$ see a train,passing by in the opposite direction with a speed of 36 km$h^{-1}$ , if the length of the second train is 150 m?
If a, b, c and d are mass, length, time and current respectively, then $b^2 \, a/ c^3$ d has the dimensions of
The dimension of light year is :
If for a particle executing SHM, the equation of SHM is given as y= a cos $\omega$t Then which of the following graph represents the variation in its potential energy?
A stone tied to one end of spring $80\,cm$ long is whirled in a horizontal circle with a constant speed. If stone makes $25 $ revolutions in $14 \sec$, the magnitude of acceleration of stone is :
Which isotope is likely to be most stable?
The formation of ice is started in a lake with water at $0^{\circ} C$. When the atmospheric temperature is $-10^{\circ} C$. If time taken for $1 \,cm$ of ice to be formed is $7$ hours, the time taken for the thickness of ice to increase from $1 \,cm$ to $2 \,cm$ is :
Two forces of $12\,N $ and $8\,N$ act upon a body. The resultant force on the body has a maximum value of :
In the case of horse pulling a cart, the force that causes the horse to move forward is the force that :
A truck travelling due north at $20 \,ms$ turns west and travels with same speed. What is the change in velocity?
A fire screen produces sensation of cooling as :
If the pressure of a gas contained in a vessel is increased by $0.4\%$ when heated through $1^{\circ}C$, the initial temperature had been :
For a given angle of projection, if the time of flight of a projectile is doubled, the horizontal range will increase to :
A concave mirror of focal length $15 \,cm$ forms an image having twice the linear dimension of the object. The position of the object when die image is virtual will be :
The velocity of bullet is reduced from $200\, m / s$ to $100 \,m / s$ while travelling through a wooden block of thickness of $10 \,cm$. The retardation assuming to be uniform, will be :
A fireman wants to slide down a rope. The breaking load for the rope is $\frac{3}{4}$th of the weight of the man. With what acceleration should the fireman slide down? (Acceleration due to gravity is g)
A body of mass $1\, kg$ is rotating in a vertical circle of radius $1\, m$. What will be the difference in kinetic energy at the top and at the bottom of the circle? $\left(\right.$ take $\left.g=10\, m / s ^{2}\right)$
An object is thrown along a direction making an angle $45^{\circ}$ with the horizontal direction. The horizontal range of the object is equal to :
A circular ring of mass $ m $ and radius $ r $ is rolling on a smooth horizontal surface with speed $ u $ . Its kinetic energy is :