Everyday Science MCQs

Page No. 108

Detergents dissolved in water help in cleaning clothes by_________?


aIncreasing the temperature of water


bReacting chemically with dirt


cReducing the surface tension of water


dDissolving dirt



The cracking sound heard when dry hair is combed with a hard rubber comb is due to_________?


aThe hair barging against the charged comb


bSmall electric sparks


cThe rubbing of the comb with the hair


dNone of the above


View Answer Small electric sparks

In order to prevent the corrosion of iron pipes they are often coated with a layer of zinc. This process is termed as____________?


aElectroplating


bAnnealing


cGalvanization


dVulcanization


View Answer Galvanization

Scalding with steam is more severe than scalding by boiling water because_______?


aSteam can penetrate the skin


bSteam is at a higher temperature


cSteam contains more energy than boiling water


dSteam is at a higher pressure



Water is a highly effective coolant for a car engine because _________?


aWater is good conductor of heat


bWater has very high specific heat capacity


cWater boils at a comparatively high temperature


dEvaporation of water produces lot of cooling



A train goes past a railway station at a high speed. A young boy standing on the edge of the platform is likely to __________?


aRemain unaffected


bFall away from the train


cFall towards the train


dFall away from or towards the train depending upon the speed



Which one of the following sets of color combinations is added in color vision in TV’?


aRed, green and blue


bOrange, back and violet


cWhite. red and yellow


dYellow, green and blue


View Answer Red, green and blue

A Fahrenheit thermometer indicates a temperature of ‘ 14°F. its corresponding reading on the Celsius scale will be _________?


a– 2O°C


b– 10°C


c+ 10°C


d+ 20°C


View Answer – 10°C

Lead ball falls through water more slowly than through air because __________?


aThe value of ‘g’ is less in water


bDensity of air is less than that of water


cOf the viscous force in water


dOf The surface tension of water



The rear view mirror of a motor vehicle is ________?


aConcave


bPlane


cConvex


dBiconcave


View Answer Convex

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