A dielectric is introduced in a charged and isolated parallel plate capacitor, which of the following remains unchanged?

Which of the following law states that "good absorbers of heat are good emitters"?

Doping of intrinsic semiconductor is done

A rock of mass 1000 g is exhaust gases at a rate pf 4 kg/s with a velocity 3000 m/s. The thrust developed on the rocket is

The plano-convex lens of focal length 20 cm and 30 cm are placed together to from a double convex lens. The final focal length will be

Angular momentum is consered

An object is placed at a distance 20 cm from the pole of a convex mirror f focal length 20 cm The image is produced at

susceptibility of ferromagnetic substance is

At what pint of a projectile motion acceleration and velocity are perpendicular to each other?

Energy gas between valence band and conduction band of a semiconductor is: