Refraction of Light at Plane Surfaces — Physics STD 10 — Question

critical angle is the angle of ________ In denser medium for which the angle of ________ in rarer medium is ________

A physical balance works on the principle of ___________ [energy/motion/moments]

Fill in the following blank using suitable word:
SI unit of heat is .........

Convex lens produces a ________ [virtual, inverted / real, inverted] image.

One ___________ [joule/erg of work is said to be done when a force of one ___________ [newton/ dyne] displaces a body through a distance of one metre in its own direction.

Nm is the unit of ________ .

Mechanical advantage of single movable pulley is ________ [one/two/three].

Mechanical advantage = ___________ × velocity ratio

Total internal reflection occurs only when a ray of light passes from a ___________ [rarer/denser] medium to a ___________ [rarer/denser] medium.

Fill in the following blank using suitable word:
Evaporation causes ..........