General Science Class 9 MCQS

An alloy is the homogeneous mixture of :

1. Two solid
2. Two liquid
3. Two gases
4. Solid and liquid

A saturated solution of KCl on heating becomes :

1. Unsaturated
2. Supersaturated
3. Diluted
4. All of these

If we dissolve sand into the water, then the mixture is said to be :

1. Solution
2. Suspension
3. Colloids
4. Concentrated solution

Solubility is usually expressed in grams of the solute dissolved in ________ gram of a solvent.

1. 10 grams
2. 100 grams
3. 500 grams
4. 1000 grams

Example of heterogeneous mixture is :

1. Sugar and water
2. Sand and water
3. Salt and water
4. Ink and water

2 moles of sodium chloride (NaCl) is equal to?

1. 123 grams
2. 135 grams
3. 158 grams
4. 117 grams

10% (w/w) sugar solution mean that 10 grams of solute dissolved in?

1. 90g of water
2. 95g of water
3. 100g of water
4. 105g of water

An example of true solution is :

1. Solution of starch
2. Solution of soap
3. Ink in water
4. Tooth paste

Which solution contain more water?

1. 1.0M
2. 0.75M
3. 0.5M
4. 0.25M

When a saturated solution is diluted, it change into :

1. Saturated solution
2. Unsaturated solution
3. Concentrated solution
4. Supersaturated solution