List of top Physics Questions

The direction of Lorentz force can be found by:
One solid sphere $A$ and another hollow sphere $B$ are of same mass and same outer radii. Their moment of inertia about their diameters are respectively $I_A$ and $I_B$ such that Where $d_A$ and $d_B$ are their densities
On a planet a freely falling body takes $2\,\sec$ when it is dropped from a height of $8\,m$ , the time period of simple pendulum of length $1\,m$ on that planet is:
The force constants of two springs are $ k_{1} $ and $ k_{2} $ respectively. Both are stretched till their potential energies are equal. The forces $ f_{1} $ and $ f_{2} $ applied on them are in the ratio
A body of mass $M$ is kept on a rough horizontal surface [friction coefficient $=u$). A person is trying to pull the body by applying a horizontal force $F$ but the body is not moving then
A bullet of mass $m$ moving with velocity $v$ strikes a block of mass $M$ at rest and gets embedded into it. The kinetic energy of the composite block will be
A body of mass $10 \,kg$ is moving with a constant velocity of $10 \,m/s$. When a constant force acts for $4 s$ on it, it moves with a velocity $2 \,m/s$ in the opposite direction. The acceleration produced in it is
A body of mass $0.5 \,kg$ is projected under gravity with a speed of $98 \,m/s$ at an angle of $ 60^{\circ} $ with the horizontal. The change in momentum (in magnitude) of the body is
In the case of horse pulling a cart, the force that causes the horse to move forward is the force that :
In a uniform magnetic field of induction B a wire in the form of semicircle of radius r rotates about the diameter of the circle with angular frequency $?$. The axis of rotation is perpendicular to the field. If the total resistance of the circuit is R the mean power generated per period of rotation is
In a triode valve, grid is used to control the plate current, because:
If on heating liquid through $80^{\circ} C$, the mass expelled is $(1/100)\,th$ of mass still remaining, the coefficient of apparent expansion of liquid is :
If in a diode valve, the plate potential becomes double, then plate current will be:
Bernoulli's principle is based on the law of conservation of
At what depth below the surface of the earth, acceleration due to gravity $g$ will be half its value $1600\,km $ above the surface of the earth?
The driver in a vehicle moving with a constant speed on a straight road is in a non-inertial frame of reference. A reference frame in which Newton?? laws of motion are applicable is non-inertial.
Smaller drops of liquid resist deforming forces better than the larger drops. Excess pressure inside a drop is directly proportional to its surface area.
In $He-Ne$ laser, population inversion takes place between energy levels of neon atoms. Helium atoms have a meta - stable energy level.
An organ pipe closed at one end has fundamental frequency of $1500\, Hz$. The maximum number of overtones generated by this pipe which a normal person can hear is
A wire fixed at the upper end stretches by length by applying a force $F$. The work done in stretching is
A truck travelling due north at $20 \,ms$ turns west and travels with same speed. What is the change in velocity?
The radius of gyration of a hollow spherical shell is $2.5\, J$. If its frequency of rotation is made 10 times, then new kinetic energy will be:
The magnetic field $ \vec{B} $ in a circular coil does not depend on:
A satellite of mass $m$ revolves around the earth of radius $R$ at a height $x$ from its surface. If $g$ is the acceleration due to gravity on the surface of the earth, the orbital speed of the satellite is
The variation of induced emf (e) with time (t) in a coil if a short bar magnet is moved along its axis with a constant velocity is best represented as