1. Piped Natural Gas (PNG) is used for (d)
(a) Mining
(b) Welding
(c) Anaesthesia
(d) Cooking
2. Heavy water is so called because it contains (a)
(a) Heavy isotope of hydrogen
(b) Heavy isotope of oxygen
(c) Mole number of hydrogen atoms
(d) Mole number of oxygen atoms
3. Glass is soluble in (d)
(a) H₂SO₄
(b) HCIO₄
(c) HNO₃
(d) HF
4. Who was the father of Biology? (a)
(a) Aristotle
(b) Antoine Lavoisier
(c) Eratosthenes
(d) none of these
5. Nitrogen is an essential constituent of all: (b)
(a) Fats
(b) Proteins
(c) Vitamins
(d) Carbohydrates