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
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
The cracking sound heard when dry hair is combed with a hard rubber comb is due to_________
(A) The hair barging against the charged comb
(B) Small electric sparks
(C) The rubbing of the comb with the hair
(D) None of the above
In order 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) Galvanization
(D) Vulcanization
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
Water is a highly effective coolant for a car engine because _________
(A) Water is 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 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 __________
(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
Which one of the following sets of color combinations is added in color vision in TV
(A) Red, green and blue
(B) Orange, back and violet
(C) White. red and yellow
(D) Yellow, 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
Lead ball falls through water more slowly than through air because __________
(A) The value of âgâ is less in water
(B) Density of air is less than that of water
(C) Of the viscous force in water
(D) Of The surface tension of water