Questions

Junagadh

A pure solid and a pure liquid are definitely a single phase because they are so united, or homogeneous. This leads to a homogeneous mixture also being a single phase.

Hence, the option that cannot be considered a single phase is A. a heterogeneous mixture.

A nanosecond (ns) is an SI unit of time equal to one thousand-millionth of a second or one billionth of a second.

• That is, 1/1,000,000,000 of a second, or 10^−9 seconds.

Air or gas can build up in the pleural space and when this happens, it's called a pneumothorax.

Hence the given statement is TRUE.

'M' is used as a unit of molarity and stands for mole per litre i.e, number of moles of solute per liter of solution.

Compound word means when two or more words join together to make a single word that gives a new meaning.

Here in the options, Self-evident is the compound word.

The International Day of Happiness (known as Happiness Day) is celebrated throughout the world on the 20th of March. The International Day of Happiness was founded on June 28, 2012, by the United Nations General Assembly when all 193 member states unanimously adopted UN resolution 66/281.

It was celebrated for the first time in 2013.

We know that, solids have definite shapes and definite volumes, whereas liquids have definite volumes but indefinite shapes and coming to gases it has indefinite volumes and indefinite shapes.

Hence, only in solids, the forces of attraction limit the motion of particles.