Physics Test - ...

A beam of light AO is incident on a glass slab $\left(\mu =1.54\right)$ in a direction as shown in figure. The reflected ray OB is passed through a Nicol prism. On viewing through a Nicole prism, we find on rotating the prism that: [tan 57^o= 1.54]

Distance in free space at which intensity of 5 eV neutron beam reduces to half will be nearly : (Take half life of neutron = 12.8 min)

Current I is flowing in an equilateral triangular loop of side length L as shown in figure. The magnetic field produced at the centroid of the loop is

The reading of ideal ammeter in the circuit is

A body of mass 25 kg is at rest on a horizontal surface. Minimum horizontal force required to just start motion is 73.5 N and a force of 49 N is needed to keep the body moving with a constant velocity. What is the coefficient of static friction?

The age of the wood if only \(\frac{1}{16}\)part of original\(\mathrm{C}^{14}\)is present in its piece is (\(T_{1 / 2}\)of \(\mathrm{C}^{14}\)is 5580 years)

Two particles of masses \(m_{1}\) and \(m_{2}\) have equal kinetic energies. The ratio of their momenta is

A voltage of peak value \(283 \mathrm{V}\) and varying frequency is applied to a series LCR combination in which \(\mathrm{R}=3 \Omega, L=25 \mathrm{mH}\) and \(\mathrm{C}=400 \mu \mathrm{F}\). The frequency \(f\) (in \(\mathrm{Hz}\) )of the source at which maximum power is dissipated in the above, is

A wave has velocity \(u\) in medium \(P\) and velocity \(2 u\) in medium \(Q\). If the wave is refracted from medium \(P\) to medium \(Q\) at an angle of incidence \(b\) then the angle of refraction will be