List of top Physics Questions

A charged particle moves through a magnetic field in a direction perpendicular to it. Then the
Light year is used to measure
"Parsec" is the unit of
Two bodies, $A$ (of mass $1\, kg$) and $B$ (of mass $3 \,kg$) are dropped from heights of $16\, m$ and $25 \,m$, respectively. The ratio of the time taken by them to reach the ground is:-
Two balls are dropped to the ground from different heights. One ball is dropped $ 2\, s $ after the other but they both strike the ground at the same time. If the first ball takes $ 5\, s $ to reach the ground, then the difference in initial heights is $ (g=10m{{s}^{-2}}) $
Total internal reflection takes place
A transistor is operated in common emitter configuration at constant collector voltage $ {{V}_{C}}=1.5\,V $ such that a change in the base current from 100 $ \mu A $ to 150 $ \mu A $ produces a change in the collector current from 5 mA to 10 mA. The current gain ( $ \beta $ ) is
The total energy of an electron in the first excited state of hydrogen is about $- 3.4 \,eV$. Its kinetic energy in this state is
The surface temperature of the Sun which has maximum energy emission at $500 \,nm$ is $6000 \,K$. The temperature of a star which has maximum energy emission at $400\, nm$ will be
The resistance of an ammeter is $ 13 \Omega$ and its scale is graduated for a current upto $100$ amps. After an additional shunt has been connected to this ammeter it becomes possible to measure currents upto $750$ amperes by this meter. The value of shunt-resistance is
Select the true statement from the following. Nuclear force is
One end of a thermally insulated rod is kept at a temperature $T_1$ and the other at $T_2$. The rod is composed of two sections of lengths $\ell_{1}$ and $\ell_{2}$ and thermal conductivities $k_1$ and $k_2$ respectively. The temperature at the interface of the two sections is
Magnetic field produced due to a current carrying conductor is independent of
In a semiconductor electron concentration is $7 \times 10^{13} \,cm ^{-3}$ and hole concentration is $5 \times 10^{12} \,cm ^{-3}$. Then the semiconductor is
Sound waves cannot travel in vacuum but light can travel in vacuum. Sound waves are longitudinal waves and they cannot be polarised but electromagnetic waves are transverse and they can be polarised.
A boat is rocked by waves of velocity $25 \,m/s$ having crests $100\, m$ apart. They reach the boat once every
A planet having average surface temperature $ T_{0} $ at an average distance $d$ from the sun. Assuming that the planet receives radiant energy from the sun only and it loses radiant energy only from the surface and neglecting all other atmospheric effects we conclude
Two satellites are moving in the same circular orbit around the earth. They must have the same
Energy required to accelerate a car from $10 \,m / s$ to $20\, m / s$ compared with that required to accelerate it frem $0$ to $10 \,m / s$ is
In the reaction ${ }_{1}^{2} H +{ }_{1}^{3} H \longrightarrow{ }_{2}^{4} He +{ }_{0}^{1} n$, if the binding energies of ${ }_{1}^{2} H ,{ }_{1}^{3} H$ and ${ }_{2}^{4} He$ are respectively $a, b$ and $c$ (in $MeV$, then the energy (in $MeV$ ) released in this reaction is
In the options given below, let E denote the rest mass energy of a nucleus and n a neutron. The correct option is
Which of the following is not an application of eddy currents ?
Which of the following transitions in hydrogen atoms emit photons of highest frequency?
Zener diode acts as a/an
What is the dimensions of impedance ?