581. The chemical name of quartz is:
A) Silicon dioxide (SiO2)
B) Stannous oxide
C) Aluminum oxide
D) None of these
582. Which of the following is not considered a source of vitamin C?
A) Milk
B) Orange
C) Kiwi
D) None of the above
583. Who discovered nitrogen gas?
A) Isaac Newton
B) Daniel Rutherford
C) Michael Phillips
D) None of the above
584. For reading purposes, we use which kind of lens?
A) Large convex lens with a short focal length
B) Large concave lens with a short focal length
C) Short concave lens with a long focal length
D) None of the above
585. The remains of plants and animals buried ages ago are called?
(A) Oil
(B) Mixture
C) Fossils
D) Waste material
586. Vitamin which affects someone’s ability that he cannot see in dim light is?
A) A
B) B
C) C
D) E
587. Rickets in children is due to the lack of?
A) Vitamin B
B) Vitamin C
(C) Vitamin D
(D) Vitamin E
588. Lack of vitamin E causes which of the following diseases?
(A) Rickets
(B) Delay in Blood clotting
(C) Bones breaking easily
D) Muscular and nervous disorder
589. Delay in blood clotting occurs due to the lack of which of the following vitamins?
A) Vitamin K
B) Vitamin E
C) Vitamin C
D) Vitamin D
590. Blood clotting factor in a human body is produced by the:
(A) Hemoglobin
(B) white blood cells
(C) Platelets
(D) Cyloples
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