Tissues — Science STD 9 — Question

A positively charged ion is called :

The dyes present in fountain pen ink can be separated by the technique of:

1. Fractional distillation.
2. Infrared photography.
3. Crystallization.
4. Chromatography.

A car is accelerated on a levelled road and acquires a velocity 4 times of its initial velocity. During this process, the potential energy of the car:

While doing onion peeling experiment, what is the most common problem faced in it?

The growing two or more crops at a time in a field is called as:

Match column I with the column II.

	Column I		Column II
A.	Solution	I.	Chalk in water
B.	Colloid	II.	Tincture of iodine
C.	Suspension	III.	Starch in water
D.	Homogeneous	IV.	A mixture of chalk and sand
E.	Heterogeneous	V.	Air

Mast cells occur in ______________?

Which of the following process/ processes release heat?

1. Condensation.
2. Vaporization.
3. Freezing.
4. Melting.

1. Only (i)
2. Only (iv)
3. (i) and (iii)
4. (ii) and (iv)

A person pushing a wall hard is liable to fall back. Which law is related for this?

The correct increasing order of the boiling points of liquid oxygen, liquid argon and liquid nitrogen present in liquid air is:

1. Nitrogen, oxygen, argon.
2. Nitrogen, argon, oxygen.
3. Argon, oxygen, nitrogen.
4. Oxygen, argon, nitrogen.