Physics Test - ...

A ball of mass \(m_{1}\) is moving with velocity \(3 v\). It collides head on elastically with a stationary ball of mass \(m_{2}\). The velocity of both the balls become \(v\) after collision. Then the value of the ratio \(\frac{m_{2}}{m_{1}}\) is

A transparent plastic bag filled with air forms a concave lens. Now, if this bag is completely immersed in water, then it behaves as

A lead bullet of 10g travelling at300 ms^-1strikes against a block of wood comes to rest. Assuming 50% of heat is absorbed by the bullet, the increase in its temperature (Specific heat of lead = 150jkg^-1k^-1)

A particle of mass M at rest decays into two masses m₁ and m₂ with non-zero velocities. The ratio of de-Broglie wavelengths of the particles $\frac{{\lambda }_{\mathrm{1/}}}{{\lambda }_2}$ is

A sample of HCl gas is placed in an electric field of 3 × 10⁴ NC^-1. The dipole moment of each HCl molecule is 6 × 10^-30 cm. The maximum torque that can act on a molecule is

A particle$$A has a charge and particle$$B has charge 4 with each of them having the mass m. When they are allowed to fall from rest through same potential difference, the ratio of their speeds  will be

If in Young's double slit experiment, d = 0.1 mm, D = 20 cm, and $\mathrm{\lambda }=5460\mathrm{ }\mathrm{Å}$, then angular position of first dark fringe will be

The adiabatic modulus of elasticity of gas is 2.1 × 10⁵ N m^-2. What will be its isothermal modulus of elasticity? (C_p/C_v=1.4)

A square coil ACDE with its plane vertical is released from rest in a horizontal uniform magnetic field  of length 2L. The acceleration of the coil is

The reverse voltage at which the current increases enormously, in a p-n junction, is called