46.

The hardest form of carbon is
A. coke B. graphite
C. diamond D. charcoal
Answer and Explanation
Answer:C
Explanation: No answer description available for this question.
47.

The most important ore of aluminium is
A. bauxite B. magnetite
C. haematite D. monazite
Answer and Explanation
Answer:A
Explanation: No answer description available for this question.
48.

The hottest part of the gas flame is known as
A. luminous zone B. dark zone
C. blue zone D. non-luminous zone
Answer and Explanation
Answer:D
Explanation: No answer description available for this question.
49.

The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is
A. carbon B. hydrogen
C. oxygen D. nitrogen
Answer and Explanation
Answer:C
Explanation: No answer description available for this question.
50.

The half life period of an isotope is 2 hours. After 6 hours what fraction of the initial quantity of the isotope will be left behind?
A. 1/6 B. 1/3
C. 1/8 D. 1/4
Answer and Explanation
Answer:C
Explanation: No answer description available for this question.