List of top Physics Questions

The Curie temperatures of Cobalt and iron are 1400K and 1000K respectively. At T = 1600K , the ratio of magnetic susceptibility of Cobalt to that of iron is

If a physical quantity ‘Q’ is defined in terms of moment of inertia ‘I’, force ‘F’, velocity ‘V’, work ‘W’ and length ‘L’ as \[ Q = \frac{IFV^2}{WL^3} \] then ‘Q’ is

A particle starts moving from rest under a constant acceleration, and covers a distance ‘X’ in ‘t’ seconds. The distance covered in next ‘t’ seconds is

A juggler throws balls vertically into the air such that he throws the next ball when the previous one is at its highest point. If he throws 3 balls each second, then the maximum height reached by each ball is
(Acceleration due to gravity \(g = 10~\text{ms}^{-2}\))

An object of mass 50 kg is in a lift moving up with an acceleration of 5 ms$^{-2}$. Then the apparent weight of the object and its direction is (Acceleration due to gravity = 10 ms$^{-2}$)

A solid sphere of mass \( M \) and radius \( R \) is free to rotate about an axis passing through its centre. A solid cylinder of mass \( \frac{M}{2} \) and radius \( R \) is free to rotate about its standard axis of symmetry. Initially both the sphere and the cylinder are at rest. If torques of equal magnitude are applied to the sphere and the cylinder, the ratio of the angular speeds acquired by the sphere and the cylinder after a given time is

A wire of length 0.1\(\pi\) m having linear density \( \frac{1}{\pi} \) kg m\(^{-1}\) is bent in the form of a ring. The moment of inertia of the ring about an axis passing through its centre and perpendicular to its plane is

A 200 kg steel bar sits horizontally on two supports as shown in the figure. The force on each support is (\( g = 9.8 \, \text{ms}^{-2} \))

The part of the stress-strain curve where the Hooke's Law is valid is

Two soap bubbles of radii \( r_1 \) and \( r_2 \) in vacuum coalesce isothermally to form a new bubble. The radius of the new soap bubble is

The temperature of the surface of Sun is 6000 K. The wavelength corresponding to the maximum energy is nearly (Wien's constant, \( b = 2.89 \times 10^{-3} \, \text{mK} \))

During an adiabatic process of a monatomic gas, the relation between absolute temperature (\( T \)) and pressure (\( P \)) is \( P \propto T^X \). The value of \( X \) is

A drilling machine of power \(1~\text{kW}\) is used for 5 minutes to drill a hole in a \(10~\text{kg}\) metal block. If 40% of the work done by the machine is wasted as heat, the rise in temperature of the metal block is nearly (specific heat capacity of the metal = \(420~\text{J\,kg}^{-1}\text{K}^{-1}\))

A gas is compressed from a volume of \(23~\text{m}^3\) to \(17~\text{m}^3\) at a constant pressure of \(50~\text{Nm}^{-2}\). If \(50~\text{J}\) of heat is added to the gas, then the change in its internal energy is

If the percentage increase in the pressure of a given mass of gas in a container at constant temperature is 100%, then its volume

If the speed of a wave doubles as it passes from shallow water into deeper water, its wavelength will be

Three charges \(+Q\), \(q\), \(+Q\) are placed respectively, at distances \(0\), \(\frac{d}{2}\), and \(d\) from the origin on the x-axis. If the net force experienced by \(+Q\) placed at \(x = 0\) is zero, then the value of \(q\) is

A conducting sphere of radius \(R\) carrying a charge \(Q\) lies concentrically inside an uncharged conducting shell of radius \(2R\). If they are joined by a metal wire, then the charge flowing to the shell and the amount of heat produced are respectively:

An uncharged parallel plate capacitor with dielectric constant \(K\) is connected to a similar air-cored capacitor which is charged to a potential \(V_0\). If the common potential is \(V\), then the value of \(K\) is

If \(n\), \(e\), \(\tau\), and \(m\) represent the concentration, the charge, the relaxation time, and the mass of an electron in a metal, then the resistance of a wire made of the metal of length \(l\) and cross-sectional area \(A\) is:

In a potentiometer experiment, the balancing length with a cell is \(240~\text{cm}\). On shunting the cell with \(2~\Omega\), the balancing length becomes \(120~\text{cm}\). The internal resistance of the cell is

To generate the high magnetic fields, the synchrotron uses

If the magnetic field is along the positive y-axis and the electron is moving along the positive x-axis, the direction of force on the electron is

A bar magnet of length \(0.1~\text{m}\) and magnetic moment of \(5~\text{Am}^2\) is placed in a uniform magnetic field of intensity \(0.4~\text{T}\), with its axis making an angle of \(60^\circ\) with the field. The torque on the magnet is

Changing magnetic fields can set up current loops in nearby metal bodies. They dissipate electrical energy as heat. Such currents are called