List of top Physics Questions

The radius of germanium (Ge) nuclide is measured to be twice the radius of $_{4}^{9}Be.$ The number of nucieons in Ge are
A laser beam is coherent because it contains
A cosmonaut is orbiting earth in a spacecraft at an altitude h = 630 km with a speed of 8 k$ms^{ - 1}$. If the radius of the earth is 6400 km, the acceleration of the cosmonaut is
When a triode valve is used as an amplifier the phase difference between input and output voltages is
A car runs at a constant speed on a circular track of radius 100 m, taking 62.8 s for every circular lap. The average velocity and average speed for each circular lap respectively is
How should people wearing spectacles work with a microscope?
A 5 A fuse wire can withstand a maximum power of 1 W in circuit. The resistance of the fuse wire is
When a body is in resonance following physical quantity gradually increases?
Find equivalent capacitance between $A$ and $B$
Two bodies of different masses are dropped from a tower, assuming that air resistance is proportional to the mass of body. Which of the following is correct?
A man will weigh more when
Path of cathode rays entering uniform magnetic field normal to the field
The energy of an electron in an excited hydrogen atom is $ -3.4\,eV $ . Its angular momentum is
A count rate metre shows a count of $240/\min$ from a given radioactive source later the metre shows a count rate of $30/\min$. The half-life of the source is
The difference between the apparent frequency of a source of sound as perceived by the observer during its approach and recession is $2\%$ of the frequency of the source. If the speed of sound in air is $ 300\,ms^{-1}$ , the velocity of the source is
A short linear object of length $b$ lies along the axis of a concave mirror of focal length $f$ at a distance $u$ from the pole of the mirror, what is the size of image?
A body of mass $m$ moving with velocity $v$ makes a head-on collision with another body of mass $2\, m$ which is initially at rest. The loss of kinetic energy of the colliding body (mass $m$ ) is
A cane filled with water is revolved in a vertical circle of radius $4\, m$ and the water does not fall down. What must be the maximum period of revolution?
When a wire is stretched and its radius becomes $\frac {r}{2}$. then its resistance will be
A copper wire of length $1\, m$ and radius $1\, mm$ is joined in series with an iron wire of length $2\, m$ and radius $3\, mm$ and a current is passed through the wires. The ratio of the current density in the copper and iron wires is
A block of mass $m$ is connected to another block of mass $M$ by a spring (massless) of spring constant $k$. The blocks are kept on a smooth horizontal plane. Initially the blocks are at rest and the spring is unstretched. Then a constant force $F$ starts acting on the block of mass $M$ to pull it. Find the force on the block of mass $m$
A long straight wire of radius $'a'$ caries a steady current $i$. The current across its cross section. The ratio of the magnetic field at $\frac{a}{2}$ and $2a$ is
An ideal coil of $10H$ is connected in series with a resistance of $5\, \Omega$ and a battery of $5V. 2$ second after the connection is made the current flowing in amperes in the circuit is
For inelastic collision between two spherical rigid bodies
A point source emits sound equally in all directions in a non-absorbing medium. Two points $P$ and $Q$ are at distances of $2\, m$ and $3\, m$ respectively from the source. The ratio of the intensities of the waves at $P$ and $Q$ is