Everyday Science MCQs

Page No. 92

All of the following substances are crystalline except_____________?


aIce


bDiamond


cSucrose


dPlastic


View Answer Plastic

Some substances are good conductor of electricity in both the solid and liquid states. These substances are generally______________?


aionic substances


bmetallic substances


cmolecular solids


dcovalent network solids


View Answer metallic substances

Which of the following is a substance?


aSea water


bBrass


cGraphite


dSand


View Answer Graphite

An atom is_____________?


asmallest indivisible particle in an element


bsmallest particle of an element which can undergo a chemical reaction


cbuilding block of an element


dalways smaller than molecule



All of the following statements are incorrect except:


aPrecision and accuracy should go side by side in a scientific work


bScientific work must be precise, accuracy is not essential


cScientific work must be acurate, accuracy is not essential


dCalculations must be made before any experiment



The average speed of a moving object during a given interval of time is always:


athe magnitude of its average velocity over the interval


bthe distance covered during the time interval divided by the time interval


cone-half its speed at the end of the interval


dits acceleration multiplied by the time interval



The SI base unit for mass is_____________?


aGram


bPound


cKilogram


dOunce


View Answer Kilogram

Which of the following is closest to a yard in length?


a0.01m


b0.1m


c1m


d10m


View Answer 1m

Water is a universal solvent for what reactions?


aChemical


bBiochemical


cPhysical


dNuclear


View Answer Biochemical

During a total solar eclipse the rate of Photosynthesis___________?


aIncrease


bDecrease


cRemain Constant


dNone of these


View Answer Decrease

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