General Science Page-7

61) Total internal reflection occurs when light travels from:
(A) A rarer medium to a denser medium
(B) A denser medium to a rarer medium
(C) A rarer medium to a denser medium and the angle of incidence is less than the critical angle
(D) A rarer medium to a denser medium and the angle of incidence is greater than the critical angle

62) A chair is tilted about two of its legs and the left it would return to its original position if:
(A) Its centre of gravity falls outside the base
(B) Its centre of gravity falls within the base
(C) It is tilted through an angle of 60'
(D) It will never regain its original position

63) Heat from the sun is received by the earth through:
(A) Conduction
(B) Convection
(C) Radiation
(D) None of the above

64) The picture tube of a black and white T.V set has only one electron 'gun' that produces the picture on its screen. The number of electron 'gun' a colour picture tube has a:
(A) Three
(B) Four
(C) Six
(D) Five

65) Which one of the following elements is extensively used in electronics?
(A) Zirconium
(B) Silicon
(C) Selenium
(D) Sodium


66) Which one of the following mixture of gases is required in gas welding?
(A) Oxygen and ethylene
(B) Oxygen and hydrogen
(C) Acetylene and oxygen
(D) Acetylene and hydrogen

67) The largest cell in the human body is:
(A) Nerve cell
(B) Muscle cell
(C) Liver cell
(D) Kidney cell

68) Dead red blood corpuscles are stored in:
(A) Liver
(B) Kidney
(C) Spleen
(D) Heart

69) A thermostat is:
(A) An instrument by which the accuracy of thermometers determined
(B) A modern type of thermoflask which work on the principle of equipartition of heat energy
(C) A device used to maintain a constant temperature of a water bath or an oven
(D) A device which varies the temperature of a bath

70) The time interval between two beats of a normal human heart is:
(A) 0.5 second
(B) 1 second
(C) 2 seconds
(D) 3 seconds



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