List of top Physics Questions

Two pendulums begin to swing simultaneously. If the ratio of the frequency of oscillations of the two is $ 7:8, $ then the ratio of lengths of the two pendulums will be
Select the right option in the following
Mass defect in a fusion reaction is 0.36%. Energy liberated when 1 gm of material undergoes fusion in kWh is
The insulation property of air breakdown is $3 \times 10^6 V/m$. Maximum charge in coulomb that can be given to a sphere of radius 10 cm is approximately
A heating coil takes 6 min to boil certain amount of milk. Another heating coil takes 3 min to boil same amount of milk. Supply voltage is same. When the coils are connected in parallel, time taken to boil same amount of milk is
A particle is projected with a velocity so that height attained becomes equal to the radius of the earth. Then the velocity is
A step up transformer has turns ratio $10 : 1$. A source of emf 2 volts is fed to the primary. Secondary voltage developed is
Magnetic moment of deuteron is
Curie temperature is the temperature above which
A number of capacitors labelled as $8 \, \mu F, 250 \, V$ are given. Minimum number of capacitors needed to get an arrangement equivalent to $10 \, \mu F, 1000 \, V$ is
An electron projected in a perpendicular uniform magnetic field of $3 \times 10^{-3} T, $ moves in a circle of radius 4 mm. The linear momentum of electron $(in \, kg-ms^{-1}) $ is
An ideal gas heat engine operates in Carnot cycle between 227°C and 127°C. It absorbs 6 x 104 cal of heat at higher temperature. Amount of heat converted to work is:
In any fission process the ratio $\frac{mass \, of \, fission \, products}{mass \, of \, parent \, nucleus} is$
Two batteries, one of emf 18 volts and internal resistance $2\, \Omega$ and the other of emf 12 volts and internal resistance $1\, \Omega$ are connected as shown. The voltmeter V will record a reading of
Which of the following circular rods,(given radius r and length l)each made of the same material and whose ends are maintained at the same temperature will conduct most heat?
When a wire of uniform cross-section a, length l and resistance R is bent into a complete circle, resistance between any two of diametrically opposite points will be
A coil in the shape of an equilateral triangle of side l is suspended between the pole pieces of a permanent magnet such that $\vec{B}$ is in plane of the coil. If due to a current i in the triangle a torque $ \tau $ acts on it, the side l of the triangle is
A force $F$ acting on an object varies with distance $x$ as shown in the figure. The force is in $N$ and $x$ in $m$. The work done by the force in moving the obiect from $x=0$ to $x = 6 \,m$ is
In any fission process the ratio (mass of fission products/mass of parent nucleus) is :
In a p-n junction photo cell, the value of the photo-electromotive force produced by monochromatic light is proportional to
A particle describes a horizontal circle in a conical funnel whose inner surface is smooth with speed of $ 0.5\,m/s $ . What is the height of the plane of circle from vertex of the funnel?
$ 2\,g $ of water condenses when passed through $ 40\,g $ of water initially at $ 25^{\circ}C $ . The- condensation of steam raises the temperature of water to $ 54.3^{\circ}C $ . What is the latent heat of steam?
The spectral energy distribution of a star is maximum at twice temperature as that of sun. The total energy radiated by star is
If $M$ is the mass of the earth and $R$ its radius, the ratio of the gravitational acceleration and the gravitational constant is :
From the adjacent figure, the correct observation is