741. The chemical name of “Acid” (Tezaab) is___________?
A. Sulfuric acid
B. Sodium chloride
C. Citric Acid
D. None of these

742. Which human hormone is called love hormone?
A. Oxytocin
B. Melatonin
C. Adrenalin
D. Renin

743. How many layers does the earth have?
A. 1
B. 2
C. 3
D. 4

744. Earth is divided into following three layers?
a. Crust, Mountains, Oceans
b. Crust, Mantle, Trenches
c. Trenches, Mountains, Core
d. Crust, Mantel, Core

745. Which of the following cannot be stored in glass bottle?
A. Aqua regia
D. HBr

746. What are the three basic units of measurement for the metric system?
A. Metre, litre and gramme
B. Centimetre, kilograms and metric
C. Kilogram, mass and energy
D. Kelvin, cd and mole

747. Which are the only two elements on the periodic table that are liquid at room temperature?
A. Mercury and Bromine
B. Carbon and helium
C. Nitrogen and Hydrogen
D. Oxygen and Neon

748. Who invented the first battery?
A. Alessandro volta
B. Tim Berner
C. Rob Stothard
D. Georges Leclanche

749. Lunar eclipse occurs on__________?
A. New Moon
B. Full Moon
C. Half Moon
D. Quarter Moon

750. Tooth decay is caused by?
A. Salt
B. Sugar
C. Calcium
D. Formalin

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