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Supersonic jet causes pollution by thinning of:
Most of the high-level supersonic aircraft produce harmful pollutants in the stratosphere. This leads to the thinning of the O₃ (ozone) layer.
Which type of reaction produces the most harmful radiation?
Which type of glass is used for making glass reinforced plastic?
Glycol is added to aviation gasoline because it:
Now-a-days yellow lamps are frequently used as street lights. Which of the following gases is used in these lamps?
Lens is made up of:
Flint glass is optical glass that has relatively high refractive index and low Abbe number (high dispersion).
Which of the following is responsible for the extra strength of pyrex glass?
The temperature of oxyacetylene flame is around:
The Refrigerant ‘FREON’ is:
Difluoro Dlchloro Methane is used as a refrigerant gas in refrigerators and air conditioners.
A balloon filled with helium rises in air because:
Cooking oil is converted into vegetable ghee by the process of:
Which of the toxic heavy metals is found in modern tannery industries?
Which of the following contains high content of lead?
Stainless steel is an alloy of:
Raw materials used for the manufacture of glass are:
Which of the following is used in welding broken pieces of iron rails and machine parts?
The BOD values of water indicate the:
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.
The product used for manufacturing of Industrial alcohol is:
The metals commonly used for electroplating are:
Which of the following in automobile exhaust can cause cancer?
Cement is usually a mixture of:
Electric bulbs are filled with: