Soap and detergents remove the dirt from clothes due to__________?
A. Osmosis
B. Capillary action
C. Lowering of interfacial tension
D. Diffusion
Which of the following is a component of soap?
A. Sodium sulphate
B. Sodium stearate
C. Sodium chloride
D. Sodium nitrate
If steel is heated to a temperature well below red heat and is then cooled slowly, the process is called_________?
A. Annealing
B. Quenching
C. Tempering
D. Nitriding
Which of the following type of Coal, has maximum carbon content?
A. Peat
B. Lignite
C. Anthracite
D. Bituminious
Oil rises up to wick in a lamp because_____________?
A. Oil is very light
B. Oil is volatile
C. Diffusion of oil through the wick
D. Capillary action phenomenon
The scientific study of fingerprints is called _________ ?
A. Dactylography
B. Dactylology
C. Dactyliology
D. Dialectology