Vitamin D deficiency causes __________.
A. night blindness
B. rickets
C. Scurvy
D. None of these
The refrigerator contains which gas ___________?
A. Methane
B. Carbon dioxide
C. Nitrogen
D. Tetrafluoroethene
CNG is an abbreviation of?
A. Conducted Natural Gas
B. Conduced Natural Gas
C. Converted Natural Gas
D. Compressed Natural Gas
Earth is nearer to which planet?
A. Mars
B. Mercury
C. Venus
D. Moon
1 light year = ?
A. 9.5×1012 km
B. 9.5×109 km
C. 9.5×106 km
D. 9.5×1018 km
Which substance is necessary for teeth formation?
A. Fluorine
B. Copper
C. Iodine
D. Iron
Which one is “laughing gas”?
A. Nitrous Oxide
B. Sulfur Dioxide
C. Carbon Dioxide
D. Sodium Oxide
Earth’s 50% percent composition is water and _________?
A. Silicon
B. Carbon Dioxide
C. Oxygen
D. Clay
Bronze is an alloy of?
A. copper, silver
B. copper, tin
C. copper, nickel
D. copper, zinc
A light year is a unit. Which category does it belong to?
A. Length
B. Energy
C. Time
D. Mass