A ray of light falls normally on a rectangular glass slab. Draw a ray diagram showing the path of the ray till it emerges out of the slab.

Name the gas that is produced in - Action of dilute hydrochloric acid on sodium sulphide

What impact does the waste accumulation have on the Quality of water around us

How does uniform circular motion differ from uniform linear motion?

Name the tree: The stilt roots are underwater during high tide.

There is plenty of rain in India during the rainy season, yet we need irrigation. Give two reasons to support this statement.

Briefly explain the following term: Power of accommodation

How is the frequency of a stretched string related to:

1.  its length?
2. its tension?

What do you understand by the following statements:

1. The heat capacity of the body is 60 JK^-1.
2. The specific heat capacity of lead is 130 Jkg^-1K^-1.

The metal which does not react with water or dilute H₂SO₄ but reacts with concentrated H₂SO₄ is ____ . (Al / Cu / Zn / Fe)

With reference to the Rise of Dictatorships and the Second World War, answer the following: Explain any three consequences of World War II.

Arrange α, β and γ rays in ascending order with respect to their

1. Penetrating power.
2. Ionising power.
3. Biological effect

State the characteristics required of a good thermion emitter

The number of moles in 11gm of nitrogen gas is  is ______. (0.39, 0.49, 0.29) [atomic mass of N=14]

Action of concentrated sulphuric acid on Sulphur.

The type of reactions alkenes undergo.

Identify the term/substance.