In night, when photosynthesis is stopped, plants__________.
A- take in Carbon Dioxide
B-take in Oxygen
C-give off Carbon Dioxide
D-give off Oxygen
In a very low temperature which from the following will freeze at last?
A. River water
B. Mineral water
C. Sea water
D. None of these
Deficiency of Vitamin-A results in __________.
A. Night blindness
B. rickets
C. hair fall
D. scurvy (more…)
During winter in cold countries, the __________ is mixed to melt the ice on the icy roads.
A. Water
B. Chlorine
C. Carbon dioxide
D. Salt
Analytical solutions to Quadratic equations were introduced by__________.
A. Al-Khawarzimi
B. Al-Haitham
C. IsasacNewton
D. Pythagoras (more…)
The 2018 Nobel Prize in Physiology or Medicine has been awarded jointly to James P. Allison and Tasuku Honjo for their discovery of which
cancer?
A. Immunotherapy
B. Radiation
C. Surgery
D. Chemotherapy (more…)
Who invented Logarithm
Tables?
A. John Adams
B. John William
C. John Napier
D. John Harrison (more…)
Which of the following natural elements has the highest melting point?
A. Tungsten
B. Iron
C. Copper
D. Silver
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