41. Which of the following is the lightest substance?
A. Uranium
B. Hydrogen
C. Oxygen
D. Nitrogen

42. For glavinizing of iron which of the following metals is used ?
A. Aluminimum
B. Copper
C. Zinc
D. Lead

43. Crude Oil is heated in the furnace up to _________?
A. 300°C
B. 350°C
C. 400°C
D. 450°C

44. Inflammation of liver is caused by____________?
A. Cholera
B. Hepatitis
C. Typhoid
D. Jaundice

45. Speed of sound in air is _______km/h?
A. 1347
B. 243
C. 1235
D. 1495

46. What is the percentage of water present in our brain?
A. 85%
B. 95%
C. 97%
D. 73%

47. Identify the blackest fish in the oceans?
A. Black Seafish
B. Black Dragon fish
C. Black Sea Horse
D. Black Gillfish

48. Sensory neurons carry message towards ?
A. Muscle
B. Muscles and Glands
C. Sense and Organs
D. Brain and Spinal Cord

49. The apart of neuron which receives message are__________?
A. Cell Bodies
B. Axons
C. Nuclei
D. Dendrites

50. Accumulation of salts in kidneys results in_________?
A. Diabetes
B. Hypertension
C. Cancer
D. Kidney Stone

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