List of top Physics Questions

The net magnetic flux through any closed surface is:

The minimum wavelength of X-rays produced by an electron accelerated through a potential difference of V volts is proportional to:

The errors in the measurement which arise due to unpredictable fluctuations in temperature and voltage supply are:

If \(∮_s\overrightarrow{E}.\overrightarrow{dS}=0\) over a surface, then:

Three resistors having resistances r₁, r₂ and r₃ are connected as shown in the given circuit. The ratio \(\frac{i_3}{i_1}\) of currents in terms of resistances used in the circuit is

Magnetic field \(|B|\) at a point \(P\) in the following network is:

Brief exposure to the sound of minimum can damage ear drums of humans.

The graph showing correct variation of photo current with intensity of incident light:

Match LIST I with LIST II

LIST I Device		LIST II  Purpose
A	Microphone	I	Used in vehicles to measure distance
B	Audiometer	II	For measuring the force and velocity of wind
C	Odometer	III	Converts sound waves to electrical vibrations
D	Anemometer	IV	Measures intensity of sound

Choose the most appropriate answer from the options given below:

Match List I with List II

List I	List II
(A) Rn22286 → Po21884	(III) α particle
(B) Bi21483 → Po21484	(I) β− particle
(C) Th23490 → U23492	(I) β− particle
(D) Na2211 → Na2210	(II) β+ particle

In a metallic conductor, under the effect of applied electric field, the free electrons of the conductor 

A source of sound is moving towards a stationary observer with $\left(\frac{1}{10}\right)^{\text{th}}$ the speed of sound. The ratio of apparent to real frequency is

Equation of simple harmonic progressive wave is given by $y=\frac{1}{\sqrt{a}}\sin(\omega t)\pm \frac{1}{\sqrt{b}}\cos(\omega t)$. Then the resultant amplitude of the wave is ($\cos 90^{\circ}=0$):

The power factor of an R-L circuit is $\frac{1}{\sqrt{2}}$. If the frequency of AC is doubled the power factor will now be

In an AC circuit, the current is $i=5 \sin(100t - \frac{\pi}{2})$ A and voltage is $e=200 \sin(100t)$ volt. Power consumption in the circuit is ($\cos 90^{\circ}=0$)

A solid sphere rolls without slipping on an inclined plane at an angle $\theta$. The ratio of total kinetic energy to its rotational kinetic energy is

Two discs of same mass and same thickness (t) are made from two different materials of densities $d_{1}$ and $d_{2}$ respectively. The ratio of the moment of inertia $I_{1}$ to $I_{2}$ of two discs about an axis passing through the centre and perpendicular to the plane of disc is

A seconds pendulum is placed in a space laboratory orbiting round the earth at a height '3R' from the earth's surface. The time period of the pendulum will be (R = radius of earth)

When a string of length 'l' is divided into three segments of length $l_{1}$, $l_{2}$ and $l_{3}$, the fundamental frequencies of three segments are $n_{1}$, $n_{2}$ and $n_{3}$ respectively. The original fundamental frequency 'n' of the string is

A closed organ pipe of length $L_{1}$ and an open organ pipe contain diatomic gases of densities $\rho_{1}$ and $\rho_{2}$ respectively. The compressibilities of the gases are same in both pipes, which are vibrating in their first overtone with same frequency. The length of the open organ pipe is (Neglect end correction)

A solid metallic sphere has a charge +3Q. Concentric with this sphere is a conducting spherical shell having charge -Q. The radius of the sphere is 'A' and that of the spherical shell is 'B' ($B>A$). The electric field at a distance 'R' ($A<R<B$) from the centre is ($\epsilon_{0} =$ permittivity of vacuum)

According to kinetic theory of gases, which one of the following statements is wrong?

In a thermodynamic process, there is no exchange of heat between the system and surroundings. Then the thermodynamic process is