List of top Physics Questions

When an electron does transition from $n = 4$ to $n = 2$, then emitted line spectrum will be
The correct relation for $\alpha, \beta$ for a transistor
Figure shows currents in a part of an electric circuit, then current $I$ is
The ratio  \((W/Q)\) for a carnot–engine is \(\frac 16\), Now the temperature of sink is reduced by  \(62 \ ºC\), then this ratio becomes twice, therefore the initial temperature of the sink and source are respectively:
Who evaluated the mass of electron indirectly with help of charge:
The plates of a parallel plate capacitor of capacity 50 $ \mu F $ are charged to a potential of 100 volts and then separated from each other so that the distance between them is doubled. How much is the energy spent in doing so?
A mass is performing vertical circular motion (see figure). The average velocity of the particle is increased, then at which point the string will break :
n identical mercury droplets charged to the same potential $V$ coalesce to form a single bigger drop. The potential of new drop will be
Which of the following is a characteristic temperature for the thermocouple?
By photoelectric effect, Einstein proved
The value of quality factor is
The bob of simple pendulum having length l, is displaced from mean position to an angular position q with respect to vertical. If it is released, then velocity of bob at equilibrium position
A charge Q is situated at the corner of a cube, the electric flux passed through all the six faces of the cube is
A body of mass $3\,kg$ hits a wall at an angle of $60^{\circ}$ and returns at the same angle. The impact time was $0.2\, sec$. The force exerted on the wall
The half-life of a radioactive isotope is 3 h. If the initial mass of the isotope was 300 g, the mass which remained undecayed after 18 h would be
The potentiometer is best for measuring voltage,as:
Which species does not exhibits paramagnetism:
Two masses as shown in the figure are suspended from a massless pulley. The acceleration of the system when masses are left free is
A tall man of height 6 feet, want to see his full image. Then required minimum length of the mirror will be
Calculate the net resistance of the circuit between A and B :
The kinetic energy of a body becomes four times its initial value. The new linear momentum will be
A car starts with acceleration $2\,m s^{-2}$. A scooterist starts towards the car with a velocity of $20\,ms^{-1}$. If the scooterist was $96\,m$ behind the car at the start, the time in which he overtakes the car is
$10\,CC$ of hydrogen and oxygen each are kept in separate flasks. Then the correct statement is
In Young's double slit experiment the separation between the slits is halved and the distance between the slits and the screen is doubled. The fringe width will
Equation of progressive wave is given by $y=a \, \sin\,\pi(40t-x)$ where $a$ and $x$ are in metre and $t$ in second. The velocity of the wave is (m/s)