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171) Which of the following sets of color combinations is added in color vision in TV?
(a) Red, green, and blue
(b) Orange, black, and violet
(c) White, red, and yellow
(d) Yellow, green, and blue
172) A train goes past a railway station at high speed. A young boy standing on the edge of the platform is likely to ________.
(a) Remain unaffected
(b) Fall away from the train
(c) Fall towards the train
(d) Fall away from or towards the train depending upon the speed
173) Water is a highly effective coolant for a car engine because ________.
(a) Water is a good conductor of heat
(b) Water has very high specific heat capacity
(c) Water boils at a comparatively high temperature
(d) Evaporation of water produces a lot of cooling
174) Scalding with steam is more severe than scalding by boiling water because ________.
(a) Steam can penetrate the skin
(b) Steam is at a higher temperature
(c) Steam contains more energy than boiling water
(d) Steam is at a higher pressure
175) To prevent the corrosion of iron pipes, they are often coated with a layer of zinc. This process is termed as ________.
(a) Electroplating
(b) Annealing
(c) Galvanisation
(d) Vulcanisation
176) The cracking sound heard when dry hair is combed with a hard rubber comb is due to ________.
(a) The hair baring against the charged comb
(b) Small electric sparks
(c) The rubbing of the comb with the hair
(d) None of the above
177) Detergents dissolved in water help in cleaning clothes by ________.
(a) Increasing the temperature of water
(b) Reacting chemically with dirt
(c) Reducing the surface tension of water
(d) Dissolving dirt
178) The absorption of ink by blotting paper involves ________.
(a) Viscosity of ink
(b) Capillary action phenomenon
(c) Diffusion of ink through the blotting
(d) Siphon action
179) Materials for rain-proof coats and tents owe their water-proof properties to ________.
(a) Surface tension
(b) Viscosity
(c) Specific gravity
(d) Elasticity
180) A satellite moving around the earth with a uniform speed has ________.
(a) An accelerated motion
(b) No acceleration at all
(c) Uniform acceleration
(d) Uneven acceleration
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