Physics Test - ...

Match the type of wave with its wavelength:

An air-cored solenoid with length \(30 \mathrm{~cm}\), area of cross-section \(25 \mathrm{~cm}^{2}\) and number of turns \(500\), carries a current of \(2.5 \mathring{A}\). The current is suddenly switched off in a brief time of \(10^{-3} \mathrm{~s}\). How much is the average back emf induced across the ends of the open switch in the circuit? Ignore the variation in the magnetic field near the ends of the solenoid.

A point on \(P - V\) diagram shows:

Minimum wavelength of X-ray is \(0.1 \mathring{A}\) then applied accelerating voltage on the tube is:

If one mole of Carbon contains \(x\) atoms, then the number of atoms in \(12\) g of Magnesium is:

A car of mass 1 tonne is moving with a speed of 30 m/s. It suddenly applies the brakes and stops after moving a certain distance d. The frictional force between the tyres and road is\(F = k \sqrt{ x }\) where x is the distance covered. If k = 1000, the distance d covered by the car before stopping is:

The transmission of high frequencies in a coaxial cable is determined by:

Two charges, one of \(+5 \mu C\) and another of \(-5 \mu C\) are kept \(1 \) mm apart. Calculate the dipole moment.

Displacement of a particle executing simple harmonic motion is represented by \(\mathrm{Y}=\) \(0.08 \sin \left(3 \pi \mathrm{t}+\frac{\pi}{4}\right)\) metre. Then calculate:

(a) Time period.

(b) Initial phase

(c) Displacement from mean position at \(\mathrm{t}=\frac{7}{36}\) sec.