The type of glass used in making lenses and prisms is
A. Jena glass
B. Soft glass
C. Pyrex glass
D. Flint glass
Answer: Option D
A. Jena glass
B. Soft glass
C. Pyrex glass
D. Flint glass
Answer: Option D
The tree which sends down roots from its branches to the soil is known as:
A. Oak
B. Pine
C. Banyan
D. Palm
Brass gets discoloured in air because of the presence of which of the following gases in air?
A. Oxygen
B. Hydrogen Sulphide
C. Carbon dioxide
D. Nitrogen
Which of the following is a non metal that remains liquid at room temperature?
A. Phosphorous
B. Bromine
C. Chlorine
D. Helium
Optical glass