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- Question 1 of 22
1. Question
Supersonic jet causes pollution by thinning of:
Hint
Most of the high-level supersonic aircraft produce harmful pollutants in the stratosphere. This leads to the thinning of the O₃ (ozone) layer.
- Question 2 of 22
2. Question
Which type of reaction produces the most harmful radiation?
- Question 3 of 22
3. Question
Which type of glass is used for making glass reinforced plastic?
- Question 4 of 22
4. Question
Glycol is added to aviation gasoline because it:
- Question 5 of 22
5. Question
Now-a-days yellow lamps are frequently used as street lights. Which of the following gases is used in these lamps?
- Question 6 of 22
6. Question
Lens is made up of:
Hint
Flint glass is optical glass that has relatively high refractive index and low Abbe number (high dispersion).
- Question 7 of 22
7. Question
Which of the following is responsible for the extra strength of pyrex glass?
- Question 8 of 22
8. Question
The temperature of oxyacetylene flame is around:
- Question 9 of 22
9. Question
The Refrigerant ‘FREON’ is:
Hint
Difluoro Dlchloro Methane is used as a refrigerant gas in refrigerators and air conditioners.
- Question 10 of 22
10. Question
A balloon filled with helium rises in air because:
- Question 11 of 22
11. Question
Cooking oil is converted into vegetable ghee by the process of:
- Question 12 of 22
12. Question
Which of the toxic heavy metals is found in modern tannery industries?
- Question 13 of 22
13. Question
Which of the following contains high content of lead?
- Question 14 of 22
14. Question
Stainless steel is an alloy of:
- Question 15 of 22
15. Question
Raw materials used for the manufacture of glass are:
- Question 16 of 22
16. Question
Which of the following is used in welding broken pieces of iron rails and machine parts?
- Question 17 of 22
17. Question
The BOD values of water indicate the:
Hint
Biological oxygen demand (BOD) generally represents how much oxygen is needed to break down organic matter in water. Clean water has BOD which is less than 5 ppm.
- Question 18 of 22
18. Question
The product used for manufacturing of Industrial alcohol is:
- Question 19 of 22
19. Question
The metals commonly used for electroplating are:
- Question 20 of 22
20. Question
Which of the following in automobile exhaust can cause cancer?
- Question 21 of 22
21. Question
Cement is usually a mixture of:
- Question 22 of 22
22. Question
Electric bulbs are filled with: