List of top Physics Questions

In the nuclear reactors the moderators are used to :

In the formula $X = 3YZ^2$, $X$ and $Z$ have dimensions of capacitance and magnetic induction respectively. The dimensions of $Y$ in $MKSQ$ system are

In the following reaction, the energy released is $4 ^{1}_{1}H \to ^{4}_{2}He + 2e^{+} +$ Energy Given : Mass of $^{1}_{1}H = 1.007825 \,u$ Mass of $^{4}_{2}He = 4.002603\, u$ Mass of $e^{+} = 0.000548\, u$

In the figure a block of weight $60\,N$ is placed on a rough surface. The coefficient of friction between the block and the surface is $0.5$. The weight $W$ such that the block does not slip on the surface is

In the dead beat galvanometer, the coil is wound on a frame made of :

In the common emitter configuration of n-p-n transistor $10^{10}$ electrons enter the emitter in 1 $\mu s$ and 2% of the electrons are lost to the base, the current gain of the amplifier is

In the Bohr model of the hydrogen atom, the lowest orbit corresponds to

In the above graph, point B indicates

In stationary waves, nodes are the points where there is

In sky-wave propagation, skip-distance depends on :

In SI, the unit of latent heat is

In SI, unit of quantity of heat is

In single slit diffraction pattern

In Rutherford experments on $\alpha$ - ray scattering the number of particles scattered at $90^\circ$ be 28 per minute. Then the number of particles scattered per minute by the same foil but at 60$^\circ$ are

In positive logic, the logic state 1 corresponds to

In $p-n-p$ transistor circuit, the collector current is $10\, mA$. If $90\%$ of the holes reach the collector, the emitter and base currents respectively are

In mixture of ideal gases, the molecules have the same

In Geiger-Marsden scattering experiment, the trajectory traced by an $\alpha$ -particle depends on

In an organ pipe of length $L$ open at both ends, the fundamental mode has a frequency (where $v$ is a speed of sound in air)

In an inductor of self-inductance $L = 2\, mH$, current changes with time according to relation, $I=t^{2}e^{-t}$ At what time emf is zero?

In an LCR series a.c. circuit, the voltage across each of the components L, C and R is 50 V. The voltage across LC combination will be

In an oscillating L-C circuit the maximum charge on the capacitor is The charge on the capacitor when the energy is stored equally between the electric and magnetic field is :

In an experiment on the specific heat of a metal, a $0.20\,kg$ block of the metal at $150^\circ$C is dropped in a copper calorimeter (of water equivalent $0.025 kg$) containing $150\,cm^3$ of water at $27^\circ$C. The final temperature is $40^\circ$C. The specific heat of the metal is

In an experiment on a-particle scattering, $\alpha$-particles are directed towards a gold foil and detectors are placed in position $P,Q$ and $R$. What is the distribution of $\alpha$-particles as recorded at $P, Q$ and $R$?

In an experiment, the angles are required to be measured using an instrument. $29$ divisions of the main scale exactly coincide with the $30$ divisions of the vernier scale. If the smallest division of the main scale is half -a-degree $(0.5^?)$, then the least count of the instrument is