16. Consider the following statements. 1. Photochromic lenses are lenses that darken on exposure to ultraviolet light. 2. Photochromic properties is due to embedded microcrystalline silver chloride in the glass.
Which of the statement (s) given above is/are correct?
Only 1
Only 2
Both 1 and 2
Neither 1 nor 2
17. The ripening of fruits can be accelerated by
Decreasing Oxygen concentration of the surroundings
Increasing ethylene concentration of the surroundings
Reducing water supply to plants
Spraying urea during fruit maturation
18. Which one of the ahead given groups of diseases spreads through mosquito bites among humans?
Malaria, filariasis, polio myelitis
Ancyclostomiasis, ringworm, dengue fever
Dengue fever, viral encephalitis, yellow fever
Filariasis, malaria, ascariasis
19. ‘Arihant’ is the name of
An infantry combat vehicle
A ballistic missile
An attack helicopter
A nuclear-powered submarine
20. Which of the following pairs is/are correctly matched in context of India’s nuclear energy program? 1. First stage: Natural uranium 2. Second stage: Plutonium 3. Third stage: Uranium-235
1 and 2
2 and 3
All of these