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
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
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
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
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 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
Materials for rain-proof coats and tents owe their water proof properties to________?
A. Surface tension
B. Viscosity
C. Specific gravity
D. Elasticity
A satellite moving round the earth with a uniform speed has____________?
A. An accelerated motion
B. No acceleration at all
C. Uniform acceleration
D. Uneven acceleration
For being able to see three-dimensional pictures we have to use_________?
A. A binocular
B. A camera
C. An epidiascope
D. A stereoscopeWater has maximum density at____________?
A. 0°C
B. 4°C
C. 4° K
D. 4.8°C