(25) Eugenics is the study of:
a. Altering human beings by changing their genetic components
b. People of European region
c. Different races of mankind
d. Genetic of plants
e. None of these
(26) The position of earth in its orbit, when it is at its greatest distance from the sun causing northern summer is called:
a. Aphelion
b. Perihelion
c. Perigee
d. Apogee
e. None of these
(27) Diamond is a very expensive ornament. It is composed of a single element:
a. Carbon
b. Gold
c. Silver
d. Platinum
e. None of these
(28) Which of the following layers make radio transmission possible?
a. Troposphere
b. Ionosphere
c. Mesosphere
d. Stratosphere
e. None of these