MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which one of the following is a cause of acid rains? |
| A. | Ozone |
| B. | Ammonia |
| C. | Sulphur dioxide |
| D. | Carbon monoxide |
| Answer» D. Carbon monoxide | |
| 2. |
Why is potassium permanganate used for purifying drinking water? |
| A. | It kills germs |
| B. | It dissolves the impurities |
| C. | It is a reducing agent |
| D. | It is an oxidizing agent |
| Answer» E. | |
| 3. |
Which one among the following chemicals is used as washing soda? |
| A. | Calcium carbonate |
| B. | Calcium bicarbonate |
| C. | Sodium carbonate |
| D. | Sodium bicarbonate |
| Answer» D. Sodium bicarbonate | |
| 4. |
When pure water boils vigorously, the bubbles that rise to the surface are composed primarily of |
| A. | air |
| B. | hydrogen |
| C. | hydrogen and oxygen |
| D. | water vapour |
| Answer» B. hydrogen | |
| 5. |
Which one of the following gases is placed second in respect of abundance in the Earth's atmosphere? |
| A. | Oxygen |
| B. | Hydrogen |
| C. | Nitrogen |
| D. | Carbon dioxide |
| Answer» B. Hydrogen | |