11. Ice floats on water because of:
a) Temperature
b) Density
c) Pressure
d) None of these
12. Who invented the steam engine?
a) James Watt
b) Faraday
c) Bessel
d) All of these
13. Air is a/an_______________.
a) Element
b) Compound
c) Mixture
d) Electrolyte
14. White light passing through the prism splits into _____________
a) 4
b) 5
c) 6
d) 7
15. Water percentage in plasma is?
a) 60%
b) 70%
c) 80%
d) 90%
16. What is the primary source of energy for the Earth?
a) Wind
b) Sun
c) Geothermal
d) Nuclear
17. An alloy consisting of mainly Tin and Lead is called:
a) Solder
b) Bronze
c) Chrome
d) None of these
18. "Tooth decay" due to the deficiency of
a) Iodine
b) Fluorine
c) Calcium
d) None of these
19. Which thing is invented by Pascal?
a) Caculator and adding machine
b) Railway engine
c) Wheel
d) Bulb
20. The study of the Earth's atmosphere is called?
a) Geology
b) Metaorology
c) Hydrology
d) Ecology
