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

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(C) CO2 laser

Q2. Who gave the first evidence of Big-bang theory ?

(A) Edwin Hubble
(B) Stephanie Hawking
(C) S Chandrasekhar
(D) Albert Einstein

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(A) Edwin Hubble

Q3. Which one among the following salts causes hardness to the water ?

(A) calcium bicarbonate
(B) calcium carbonate
(C) sodium sulphate
(D) potassium chloride

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(A) calcium bicarbonate

Q4. Which one among the following processes is not part of a chemical weathering ?

(A) Hydration
(B) Exfoliating
(C) Oxidation
(D) Solutions

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(B) Exfoliating

Q5. The first geological time scale was developed by

(A) Giovani Arduina
(B) William Smith
(C) R malthus
(D) George Cuvier

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(A) Giovani Arduina