10th Class Chemistry Chapter 7 TestWATER

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. Which two elements are specifically known to increase the risk of certain cancers?

   1. Lead and Mercury

   2. Arsenic and Cadmium

   3. Chromium and Copper

   4. Nitrogen and Phosphorus

2. Effective management of which resources is required to face future challenges in Pakistan?

   1. Forest resources

   2. Mineral resources

   3. Water resources

   4. Land resources

3. Adding too much quantity of micro-nutrients can be dangerous because they are:

   1. Beneficial

   2. Poisonous

   3. Insoluble

   4. Gaseous

4. If a water sample boils exactly at  at STP, it indicates that the water is:

   1. Impure

   2. Pure

   3. Acidic

   4. Hard

5. Which process is used to remove suspended particles of smaller size that remain after sedimentation?

   1. Chlorination

   2. Aeration

   3. Filtration

   4. Distillation

6. Water must be ......... before humans can use it:

   1. Colored

   2. Sterilized

   3. Heated

   4. Acidified

7. The pH of distilled water is:

   1. 6.5

   2. 7.0

   3. 7.5

   4. 8.5

8. Which of the following is a benefit of biofertilizers?

   1. Improve soil health and structure

   2. Increase biodiversity

   3. Prevent soil degradation

   4. All of these

9. Identifying the presence of water has an important application in determining the:

   1. Temperature of substances

   2. Purity of substances

   3. Weight of substances

   4. Volume of substances

10. Which of the following agricultural practices is mentioned as a reason for water scarcity in Pakistan?

    1. Drip irrigation

    2. Sprinkler irrigation

    3. Flood irrigation

    4. Hydroponics