Pig iron is obtained from iron ore, in a blast furnace by the process of
A.oxidation
B.reduction
C.carbonation
D.desulphurisation
Author: BILAL KHATTAK
A certain first-order reaction is half completed in 23 minutes. The rate constant for the reaction must be
A.0.030 s-1
B.0.030 min-1
C.0.030 hr-1
D.0.10 min-1
Setscrews are
A.Small screws
B.Headless screws
C.Used to prevent relative motion between parts
D.Self hreading
E.Used on sheet metals only
Investment casting finds application in all of the following EXCEPT:
A.Milling cutters
B.Gold ornaments
C.Jet engine nozzles
D.Buckets for superchargers
Punnet devised a geometrical method for determining genetic combinations during crosses and know the possible expressions which is called:
A.Back-cross method
B.Test-cross method
C.Checker-board method
D.None of these
Froude number is useful in calculations for
A.Water hammer
B.Flow through pipes
C.Hydraulic jump
D.Surface tension force
E.Compressible flow problems
The half-life period of a radioactive element depends on
A.pressure
B.temperature
C.amount of element present
D.none of these
For ocean sounding where the depth of water is too much and where continuous and accurate record of the depth of water below a boat or ship is to be made, the instrument generally used is known as
A.Sound meter
B.dB meter
C.Sound box
D.Fathometer
E.Tellurometer
Which of these is time taken respectively in contraction and relaxation of atria in man?
A.0.1 second and 0.7 second
B.0.3 second and 0.5 second
C.0.2 second and 0.6 second
D.0.4 second and 0.4 second
Steel cannot be hardened unless it is heated
A.Above the lowest critical point
B.Above the middle critical point
C.Above the highest critical point
D.Between the first and second critical point
E.Between the second and third critical point
