The type of glass used in making prisms and lenses is:
- (A) Soft glass
- (B) Flint glass
- (C) Jena glass
- (D) Pyrex glass
- (B) Flint glass
The “Photosynthesis process” is actually a/an:
- (A) Exothermic process
- (B) Neutral process
- (C) Thermostatic process
- (D) Endothermic process
- (D) Endothermic process
Cooking oil can be converted into vegetable ghee by the process of:
- (A) Crystallization
- (B) Oxidation
- (C) Hydrogenation
- (D) Distillation
- (C) Hydrogenation
Old written material, which cannot be read easily, can be read by:
- (A) Cosmic rays
- (B) Ultraviolet rays
- (C) Infrared rays
- (D) Ultrasonic rays
- (C) Infrared rays
Which of the following is used as a filter in rubber tyres?
- (A) Coke
- (B) Coal
- (C) Carbon black
- (D) Graphite
- (C) Carbon black
If copper, aluminum, iron and lead are left in open air, which one will rust?
- (A) Lead
- (B) Aluminum
- (C) Iron
- (D) Copper
- (D) Copper
The gas which is responsible for the rise in mean temperature of the world is:
- (A) Nitrogen
- (B) Carbon dioxide
- (C) Hydrogen
- (D) Sodium oxide
- (B) Carbon dioxide
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