Which of the following types of glass can cut of ultraviolet rays ?

The correct answer is D, Crookes glass. It contains cerium oxide, which strongly absorbs ultraviolet radiation, so it is used in goggles for glassblowers, welders and workers near furnaces, and in lamp covers where UV must be filtered out.

• Soda glass (A): This is ordinary window and bottle glass. It is not formulated to block UV, and it transmits a good part of the UV-A band.
• Pyrex glass (B): This is borosilicate glass. Its key property is low thermal expansion, which makes it resistant to thermal shock in laboratory glassware. UV filtering is not its purpose.
• Jena glass (C): This is a heat-resistant borosilicate-type glass from Schott of Germany, used in laboratory and optical applications for thermal stability. It is not the UV-absorbing glass.

The core concept is that glass composition decides its optical behaviour. Additives such as cerium oxide change which wavelengths pass through. This links to the Science and Technology and Environment sections, since UV exposure and ozone depletion are linked topics, and to material science questions at Mains.

Trap: candidates pick Pyrex or Jena because they are the 'special' glasses they remember from labs. Remember that the question asks about optical property, not thermal resistance.