What causes boredom?
A. Friction from prevailing winds
B. Rising tide while meeting river currents
C. Spring tide and strong winds
D. Unequal heating of oceans
What relationship exists between the increase in medium temperature and the speed of light?
A. Increase
B. Decrease
C. First decrease then increase
D. Remain the constant
AIDS virus is due to_______?
A. Single-stranded DNA
B. Single-stranded RNA
C. Double-stranded DNA
D. Double-stranded RNA
Upon heating, which vitamin is destroyed?
A. E
B. B
C. C
D. K
Which motor vehicle exhaust pollutant causes ____ mental disease?
A. Lead
B. Carbon dioxide
C. Calcium peroxide
D. Sulphur dioxide
What is the percentage of pure gold in 18-carat gold?
A. 0.9
B. 0.5
C. 0.75
D. 0.85
What component is necessary for the conversion of solar energy to ?
A. Silicon
B. Ultra pure carbon
C. Tantalum
D. Beryllium
Which procedure is used to refine copper?
A. Oxidation
B. Roasting
C. Electrolysis
D. Zone refining
Which area of the eye contains the pigment that determines a person’s eye color?
A. Iris
B. Retina
C. Pupa
D. Cornea
Which of the following factors produces the hue of human skin?
A. Vitamin k
B. Insulin
C. DNA
D. Melanin