NextMockપરીક્ષાઓ શોધો, દા.ત. SSC CGL, UPPSC, Lekhpal
State PCS PYQPrelims 2021

UPPCS · પ્રશ્ન 126

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

  1. Soda glass
  2. Pyrex glass
  3. Jena glass
  4. Crookes glass
જવાબ બતાવો અને સમજૂતી

જવાબ: (D) Crookes glass

સમજૂતી

Crookes glass contains cerium oxide, which absorbs UV; it is used in sunglasses.