Physics Test - ...

Which instrument is used for measuring the relative humidity of the atmosphere?

Dimensions of resistance in an electrical circuit, in terms of dimension of mass M, of length L, of time T and current I, would be

An inclined plane making an angle β with horizontal. A projectile projected from the bottom of the plane with a speed u at angle αα with horizontal, then its maximum range R_max is

The acceleration of an electron in the first orbit of the hydrogen atom (n=1) is :

A laser light of wavelength 660 nm is used to weld Retina detachment. If a laser pulse of width 60 ms and power 0.5 kW is used, the approximate number of photons in the pulse are (Take Planck's Constant, h=6.62×10⁻³⁴ J s

A signal of frequency 20 kHz and peak voltage of 5 Volt is used to modulate a carrier wave of frequency 1.2 MHz and peak voltage 25 Volts. Choose the correct statement.

Charges Q, 2Q and −Q are given to three concentric conducting spherical shells A, B and C respectively, as shown in the figure. The ratio of charges on the inner and outer surfaces of the shell C will be

A stationary source (see figure) emits sound waves of frequency f towards a stationary wall. If an observer moving with speed uu in a direction perpendicular to the wall measures a frequency f′=11/8f at the instant shown, then uu is related to the speed of sound V_s as

A coil, in the shape of an equilateral triangle of side l, is suspended between two pole pieces of a permanent magnet, such that the magnetic field B is in the plane of the coil. If due to current I in the triangle, a torque τ acts on it, the side l of the triangle is

Consider a collection of a large number of particles each moving with speed v. The direction of velocity is randomly distributed in the collection. Find the magnitude of the relative velocity between a pair of particles averaged over all the pairs in the collection.