Define standard unit.

Light travels from a rarer medium to a denser medium. The angles of incidence and refraction are respectively 45^o and 30^o. Calculate the refractive index of the second medium with respect to the first medium.
Angle of incidence i = 45^o
Angle of refraction r = 30^o

How gaseous pressure arises?

Compare the charge and mass of protons and electrons.

Write the scientific terms used to represent the following:
a) Growing of roots towards the gravity.
b) Bending of roots towards the water.

Why coelenterates are called diploblastic animals?

Give reasons why salt is used as preservative in food.

What is the heat in joules required to raise the temperature of 25 grams of water from 0ºC to 100ºC? What is the heat in Calories?
(Specific heat of water = 4.18 J/gºC)

Define electric field.

Define magnetic flux density.

Name the components of xylem and phloem.

How is the small intestine designed to absorb digested food?

What is a cosmic year?

How many valence electrons are there in carbon?

What are called Anaesthetics? How are they classified?