Everyday Science MCQs

Page No. 108

Detergents dissolved in water help in cleaning clothes by_________?


aIncreasing the temperature of water

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bReacting chemically with dirt

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cReducing the surface tension of water

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dDissolving dirt

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


aThe hair barging against the charged comb

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bSmall electric sparks

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cThe rubbing of the comb with the hair

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dNone of the above

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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

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bAnnealing

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cGalvanization

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dVulcanization

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View Answer Galvanization

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


aSteam can penetrate the skin

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bSteam is at a higher temperature

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cSteam contains more energy than boiling water

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dSteam is at a higher pressure

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


aWater is good conductor of heat

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bWater has very high specific heat capacity

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cWater boils at a comparatively high temperature

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dEvaporation of water produces lot of cooling

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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

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bFall away from the train

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cFall towards the train

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dFall away from or towards the train depending upon the speed

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


aRed, green and blue

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bOrange, back and violet

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cWhite. red and yellow

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dYellow, green and blue

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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

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b– 10°C

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c+ 10°C

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d+ 20°C

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View Answer – 10°C

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


aThe value of ‘g’ is less in water

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bDensity of air is less than that of water

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cOf the viscous force in water

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dOf The surface tension of water

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The rear view mirror of a motor vehicle is ________?


aConcave

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bPlane

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cConvex

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dBiconcave

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View Answer Convex

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