41. Which of the following gas is used in the cigarette lighter?

A. Butane

B. Redon

C. Propane

D. Methane

Click for Answer/Explanation

Correct Answer is D

42. Which one among the following can produce light by a chemical change?

A. Electric Bulb

B. Moon

C. Sun

D. Lightning and thunder

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Correct Answer is D

43. The colors of the firecrackers are extracted from the elements of the salt of –

A. Zn and S

B. Cr and Ni

C. Sr and Ba

D. K and Hg

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Correct Answer is C

44. Cobalt-60 is commonly used in radiation therapy because it emits –

A. Alpha rays

B. ß Rays

C. ? Rays

D. X – Rays

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Correct Answer is C

Read More ? Basic Terms in Thermodynamics

45. Which one of the following polymeric materials are used for making bulletproof jackets?

A. Kevlar

B. Nylon 6,6

C. Dacron

D. Rayon

Click for Answer/Explanation

Correct Answer is A

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