Four letter-clusters have been given, out of which three

Who laid the foundations of Quantum Theory?

A dielectric is pulled out of a charged capacitor (battery disconnected). The potential difference:

Water flows through a horizontal pipe at a constant volumetric rate. At a location where the cross sectional area decreases, the velocity of the fluid:

An object initially at rest explodes into several fragments. If no external forces act during the explosion, the center of mass of the fragments will:

The threshold wavelength for a photoelectric surface is 540 nm. Will a light of energy 2.5 eV cause photoemission?

Which of the following statements is true for a conductor in an electric field?

If mass is doubled and velocity is tripled, how will kinetic energy change?  

When an electric current flows, electrons move from:

Two spherical conductors of radii 2 cm and 8 cm are connected. The ratio of charges on them at equilibrium is:

A Zener diode differs from a regular diode in that: