The half-life period of a radioactive isotope is 24 days. It would be 75% decomposed in
A.12 days
B.24 days
C.36 days
D.40 days
Category: Chemical Engineering Mcqs
A floating body displaces a volume of liquid equal to
A.its own weight
B.its submerged weight
C.its own volume
D.its submerged volume.
A proton is identical with
A.ionised hydrogen molecule
B.the nucleus of hydrogen atom
C.the nucleus of deuterium
D.an ?-ray particle
Poise (P) is the unit of dynamic viscosity and one Poise is equal to
A.1 N.s/m2
B.1 lb/ft.hr
C.1 g/cm.s
D.1 kg/m.s.
GASOHOL is a mixture of petrol and
A.water
B.ethyl alcohol
C.kerosine
D.high speed diesel oil
The binary diffusivity in gases varies
A.directly as the pressure
B.inversely as the pressure
C.inversely as the square root of pressure
D.directly as the square root of pressure
The percentage of carbon is the least in
A.white cast iron
B.grey cast iron
C.wrought iron
D.stainless steel
Vapour pressure thermometers work on the principle of
A.increase of vapour pressure with decrease in temperature
B.increase of vapour pressure with increase in temperature
C.volumetric expansion of vapour with increase in temperature
D.increase in electric resistance with increase in temperature
Which one of the following statements about a chemical equation is true?
A.Mass is conserved
B.Mass as well as atoms are conserved
C.Atoms are conserved
D.Ions are conserved
The refractive index of naththas varies
A.inversely with both wave length and temperature
B.directly with both wave length and temperature
C.inversely with wave length and directly with temperature
D.directly with wave length and inversely with temperature
