Machines — Physics STD 10 — Question

What is the effect of pressure on the melting point of ice?

Light of a single colour is passed through a liquid having a piece of glass suspended in it. On changing the temperature of liquid, at a particular temperature, the glass piece is not seen.
Why is the light of a single colour used ?

Name the type of energy (kinetic energy K or potential energy U) possessed in the given cases:
An arrow shot out of a bow.

What physical quantity does the electron volt (eV) measure? How is it related to the S.I. unit of that quality?

Give reason for the following:
The efficiency of a movable pulley is always less than 100%.

Name the physical quantity that measures the degree of hotness.

State the unit of magnetic field in terms of the force experienced by a current carrying conductor placed in a magnetic field

Why do the molecules of a gas move about freely?

How is it possible to recognize a person by his voice without seeing him?

If a monochromatic beam of light undergoes minimum deviation through an equiangular prism, how does the beam pass through the prism, with respect to its base?