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.Management Sciences
Category: Stoichiometry
The number of water molecules present in a drop of water weighing 0.018 gm is 6.023 × __________?
A. 1026
B. 1023
C. 1020
D. 1019
Refractory bricks with lower permeability is produced by using _________________?
A. Higher firing temperature
B. Higher moulding pressure
C. Finer grog size
D. All A., B. and C.
Atoms of the same element, but of different masses are called__________________?
A. Isobars
B. Isotones
C. Isotopes
D. None of these
Isotopes are atoms having the same _____________________?
A. Mass number
B. Number of neutrons
C. Atomic mass
D. None of these
The vapor pressure of water at 100°C is__________________?
A. 100 N/m2
B. 76 cms of Hg
C. 13.6 cms of Hg
D. 760 mm wc
Which of the following is not a unit of pressure ?
A. Torr
B. Newton/m2
C. Parsec
D. Ata, bar or Pascal
The maximum adiabatic flame temperature of fuels in air is ____________ the maximum flame temperature in pure oxygen?
A. Lower than
B. Higher than
C. Same as
D. Not related to
Unrestrained expansion of an ideal gas does not result in its cooling due to the reason that the gas molecules ____________________?
A. Do not lose energy on collision
B. Are above the inversion temperature
C. Do not exert attractive force on each other
D. Do work equal to loss in kinetic energy
An insulating refractory brick should have high porosity and low thermal conductivity. Which of the following is not used for inducing porosity in the insulating refractory bricks during its manufacture ?
A. Cork
B. Saw dust
C. Sand
D. Chemically prepared foam
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