List of top Physics Questions

For a plane convex lens \((µ = 1.5)\) has radius of curvature 10 cm. It is silvered on its plane surface. Find focal length after silvering:

The frequency order of for \(γ-rays\ (b), X–rays\ (a), UV–rays\ (c)\):

If the gravitational force of earth suddenly disappears, then which of the following is correct?

For the given reaction, the particle X is: 6C11→5B11+β++X

Among the following find the wrong Statement
A body is moved along a straight line by a machine delivering constant power. The distance moved by the body in time t is proportional to:
A bubble in glass slab $ (\mu = 1.5) $ when viewed from one side appears at 5 cm and 2 cm from other side, then thickness of slab is
For a planet having mass equal to mass of the earth but radius is one fourth of radius of the earth. Then escape velocity for this planet will be
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
A charge Q is situated at the corner of a cube, the electric flux passed through all the six faces of the cube is
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 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: