List of top Physics Questions

Lenz?s law is consequence of the law of conservation of
0.2 moles of an ideal gas is taken round the cycle ABC as shown in the figure. The path B ? C is an adiabatic process, A ? B is an isochoric process and C ? A is an isobaric process. The temerature at A and B are TA = 300 K and TB = 500 K and pressure at A is 1 atm and volume at A is 4.9 L. The volume at C is (Given : $\gamma=\frac{Cp}{C_{V}}=\frac{5}{3}, R = 8.205 ? 10^{-2}$ L atm mol$^{-1}$ $K^{-1}, \left(\frac{3}{2}\right)^{^{2/5}} =0.81$
The given combination will work as:
A mass $m$ is attached to a thin wire and whirled in a vertical circle. The wire is most likely to break when:
The velocity of sound waves in a medium does not depend on
The total energy of an electron in an atom in an orbit is $-3.4\,eV$ . Its kinetic and potential energies arc, respectively:
The $Q$ factor for a damped oscillator is given by the
The frequency of an alternating current is 50 Hz. What is the minimum time taken by current to reach its peak value from rms value?
Most common isotope of hydrogen (Non radioactive):
Find force per unit length at P.
Energy of electron (in eV) in 2nd orbit of He ion ?
Calculate the mean % error in five observations : 80.0, 80.5, 81.0, 81.5, 82
A square conducting loop is placed near an infinitely long current carrying wire with one edge parallel to the wire as shown in the figure. If the current in the straight wire is suddently halved, which of the following statements will be true? "The loop will ....... "
A sphere and a cube of same material and same volume are heated upto same temperature and allowed to cool in the same surroundings. The ratio of the amounts of radiations emitted will be
A proton and an $\alpha$-particle are simultaneously projected in opposite directions into a region of uniform magnetic field of $2\, mT$ perpendicular to the direction of the field. After some time it is found that the velocity of proton has changed in direction by $90^{\circ}$. Then at this tune, the angle between the velocity vectors of proton and $\alpha$ - particle is
You are given an ammeter, a galvanometer and a voltmeter. From these, the device having maximum resistance is
The time period of oscillation of a magnet in a vibration magnetometer is 1.5 sec. The time period of oscillation of another magnet similar in size, shape and mass but having 1/4 magnetic moment than that of the 1st magnet oscillating at the same place will be
The relation between Shear modulus $ (G) $ , Young?? modulus $ (T) $ and Poissons ratio $ (v) $ is _______
The given transistor operates in saturation region then what should the be value of $V_{BB}: (R_{out} = 200 \Omega, R_{in} = 100 K\Omega, V_{CC} = 3 volt, V_{BE} = 0.7 volt, V_{CE} = 0, \beta; = 200)$
The equivalent capacitance between A and B is,
Taking the radius of the earth to be $6400 \,km$, by what percentage will the acceleration due to gravity at a height of $100\, km$ from the surface of the earth differ from that on the surface of the earth?
satellite revolve in radius R has a time period of revolution T. Find time period of a satellite if orbital radius is 9R?
One horse power (1 HP) is equal to
In toroid magnetic field on axis will be radius = 0.5 cm, current = 1.5A, turns = 250, permeability = 700.
For the system given below, find time period of oscillation?