By which process copper is refined ____________?

A. Roasting
B. Oxidation
C. Zone refining
D. Electrolysis

Magnalium is an alloy of_____________?

A. Magnesium and lead
B. Aluminium and zinc
C. Aluminium and magnesium
D. Aluminium and mercury

Which of the following metal occurs in free state ______________?

A. Lead
B. Iron
C. Mercury
D. Copper

The vitamin which is generally excreted by humans in urine is__________?

A. Vitamin a
B. Vitamin b
C. Vitamin b12
D. Vitamin c

The Virus of AIDS affects the growth of_____________?

A. Hemoglobin
B. Rbcs in blood
C. T cells in blood
D. Grey cells in blood

The total energy of revolving electron in an atom_____________

A. Will always be positive
B. Can never be positive
C. Can have any value above zero
D. Cannot be negative

Muscle fatigue is caused by the accumulation of___________?

A. Uric acid
B. Lactic acid
C. Oxalacetic acid
D. Fyruvie acid

An element that does not occur in nature but can be produced artificially is__________?

A. Plutonium
B. Uranium
C. Radium
D. Thorium

What is the element required for solar energy conversion ______?

A. Ultra pure carbon
B. Silicon
C. Beryllium
D. Tantalum

The ratio of pure gold in 18 carat gold is _______________?

A. 0.5
B. 0.9
C. 0.8.5
D. 0.75