Physics Test - ...

Calculate the value of peak reverse voltage (P.I.V.) if the full-wave rectifier has an alternating voltage of 300 V.

What focal length should the reading spectacles have for a person for whom the least distance of distinct vision is 50 cm?

In Young’s double-slit experiment if the distance between two slits is halved and distance between the slits and the screen is doubled, then what will be the effect on fringe width?

A lens has a focal length of 10 cm. Where the object should be placed if the image is to be 40 cm in the positive direction from the lens?

An object is to be seen through a simple microscope of power 10 D. Where should the object be placed to reduce maximum angular magnification? The least distance for distinct vision is 25 cm.

If the separation between the two slits is decreased in Young’s double-slit experiment keeping the screen position fixed, what will happen to the width of the fringe?

What is the rms value of output current if the peak value of output current is given as 0.092 A?

Find the magnification of the lens if the focal length of the lens is 10 cm and the size of the image is -30 cm.

Radioactive material decays by simultaneous emission of two particles with respective half-lives 1620 and 810 years. The time, in years, after which one-fourth of the material remains?

Why is there a sudden increase in current in Zener diode?