Monochromatic X-rays reflected from a calcite crystal (lattice constant ? = 3? ) give rise to first order Bragg reflection at 6.7?. The wavelength of these X-rays will be
A.0.07 A
B.0.7 A
C.7A
D.70 A
E.170 A
Category: Engineeeing Mcqs
White ice is
A.Sub-cooled water
B.Fast cooled water
C.Due to dissolved air, gases and impurities
D.Produced by blowing air during freezing
E.None of the above
When large quantities of bolts are to be purchased the quantity is usually specified in terms of
A.Number
B.Volume
C.Packets
D.Weight
E.None of the above
The ?H is constant in a chemical change and independent upon the path and time taken. This is known as
A.Hess law of constant heat summation
B.Lavoisier and Laplace law
C.Vant Hoffs law
D.Gibbs law
The electron volt is the unit of
A.energy
B.momentum
C.potential difference
D.charge
A law which is applicable only to ideal vapours and liquids, that equates the equilibrium partial pressures of a solution component in the coexisting phases, is known as
A.Henry’s law
B.Roult’s law
C.Joule’s law
D.Maxwell’s equation
E.Fick’s law
When sulphur dioxide is passed through a golution of hydrogen sulphide in water
A.sulphuric acid is formed in solution
B.sulphurous acid is formed in solution
C.sulphur is precipitated
D.no change is observed
In an at tomobile the power is transmitted from gear box to differential through
A.Kunckle join
B.Universal joint
C.Oldham’s coupling
D.Hooke’s joint
E.Bevel grars
The combustion process is usually accompanied by
A.rise in temperature and fall in pressure
B.rise in temperature and pressure
C.fall in temperature and pressure
D.fall in temperature and rise in pressure
A discrepancy is
A.The difference between a measurement and true value of the quantity measured
B.The difference between true value of the quantity and error
C.The difference between the measured value and actual value
D.The difference between the measured values of the same quantity
E.None of the above
