871. Bauxite is an ore of_________?
A. copper
B. zinc
C. aluminium
D. iron
872. Ruby is an oxide of__________?
A. silver
B. gold
C. platinum
D. aluminium oxide
873. First Atomic theory was proposed by?
A. John Dalton
B. E.Rutherford
C. De Broglie
D. D.I.Mendeleef
874. Air contains maximum amount of__________?
A. oxygen
B. nitrogen
C. hydrogen
D. carbon dioxide
875. The alcohol used in the preparation of dynamite is________?
A. ethyl alcohol
B. glycerol
C. glycol
D. methyl alcohol
876. The element used in lead pencils is__________?
A. Zinc
B. Lead
C. Carbon
D. Tin
877. Epsom salt is chemically known as_________?
A. Copper Sulfate
B. Magnesium Sulfate
C. Ferrous Sulfate
D. None of these
878. Calcium sulphate is known as__________?
A. Epsom salt
B. Gypsum salt
C. Blue vitriol
D. Potash alum
879. What is the SI unit of temperature?
A. Celsius
B. Fahrenheit
C. Kelvin
D. None of these
880. The ocean water moves
A. horizontally only
B. vertically only
C. horizontally and vertically
D. in all the directions