Matter in Our Surroundings — Science STD 9 — Question

You are given the following substances with their boiling and melting points.

Substance	Boiling Point (ºC)	Melting Point (ºC)
A	-183	-219
B	445	119
C	78	-15

Point out the physical states of A, B and C at room temperature (30°C).

In ammonia, nitrogen and hydrogen always combine in 14 : 3 ratio by mass.This is in agreement with:

One of the following is a solid foam. This one is:

1. Butter.
2. Bread.
3. Shaving cream.
4. Ruby.

The National Dairy Development Board (NDDB) designed and implemented the world’s largest dairy development programme, called “Operation Flood”, which came out to be the reason behind White Revolution in India. Can you name the man who is known as the Father of White Revolution?

Collenchyma mainly forms:

Which of the following physical quantities is different from others?

Which of the following substance cannot be broken down by a chemical method?

One millionth of a metre is:

________ is the characteristic of a musical sound by a which a loud sound can be distinguished from a faint sound even though both have the same pitch:

Sex organs are unicellular and non-jacketed in:

1. Algae.
2. Bryophytes.
3. Pteridophytes.
4. Gymnosperms.