A star appears twinkling in the sky because of
(A) scattering of light by atmosphere
(B) reflection of light by atmosphere
(C) refraction of light by atmosphere
(D) diffraction of light by atmosphere
' Lockjaw ' is the last phase of which of the following diseases ?
(A) Diptheria
(B) Pneumonia
(C) Syphilis
(D) Tetanus
Housefly spreads
(A) Common cold
(B) Malaria
(C) Flu
(D) Typhoid
Which of the following is caused by the higher concentration of Nitrogen and Phosphorous?
(A) Eutrophication
(B) Hardness
(C) Alkalinity
(D) Acidity
The manufacture of iron from iron ore involves the process of
(A) oxidation
(B) reduction
(C) fractional distillation
(D) electrolysis
Chloroform can be used as
(A) Analgesic
(B) Anaesthetic
(C) Antimalarial
(D) Antibiotic
Bile is produced by the
(A) Liver
(B) Stomach
(C) Pancreas
(D) Duodenum
Which one of the following is a condition of delayed blood clotting?
(A) Haemorrhage
(B) Hematuria
(C) Haemophilia
(D) Anaemia
X - rays region lies between
(A) Ultraviolet and visible region
(B) Visible and infra - red region
(C) Gamma - rays and ultraviolet region
(D) Short radio waves and long radio waves
Which electromagnetic radiation is used for satellite communication?
(A) Ultraviolet
(B) Infrared
(C) Microwave
(D) Millimeter wave
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