Q1. Which one among the following lasers is used in cancer treatment ?
(A) He -Ne laser
(B) Ruby laser
(C) CO2 laser
(D) semiconductor laser
Q2. Who gave the first evidence of Big-bang theory ?
(A) Edwin Hubble
(B) Stephanie Hawking
(C) S Chandrasekhar
(D) Albert Einstein
Q3. Which one among the following salts causes hardness to the water ?
(A) calcium bicarbonate
(B) calcium carbonate
(C) sodium sulphate
(D) potassium chloride
Q4. Which one among the following processes is not part of a chemical weathering ?
(A) Hydration
(B) Exfoliating
(C) Oxidation
(D) Solutions
Q5. The first geological time scale was developed by
(A) Giovani Arduina
(B) William Smith
(C) R malthus
(D) George Cuvier