Joining of thin foils is preferred to be done by _____________________?
A. Gamma rays
B. X-rays
C. Microwaves
D. Gas welding
CHEMICAL ENGINEERING
About _________________ ton of coke is required in a cupola to produce one ton of casting ?
About _________________ ton of coke is required in a cupola to produce one ton of casting ?
A. 0.03
B. 0.3
C. 0.8
D. 1.5
Satellites burn off during re-entry to earth’s atmosphere, because of the ____________________?
Satellites burn off during re-entry to earth’s atmosphere, because of the ____________________?
A. Combustion with air
B. Gravitational pull by earth
C. Friction with earth’s atmosphere
D. Loss in weight of the satellite
Filler material used in welding should have _________________ as compared to the parent metal to be welded ?
Filler material used in welding should have _________________ as compared to the parent metal to be welded ?
A. Lower melting temperature
B. Same melting temperature
C. Same composition
D. Both ‘B’ & ‘C’
The only suitable method for hardening the low carbon steel is case hardening. Which of the following is a case hardening process ?
The only suitable method for hardening the low carbon steel is case hardening. Which of the following is a case hardening process ?
A. Cyaniding
B. Sherardizing
C. Spheroidising
D. None of these
With increase in temperature, the electrical conductivity of semiconductors_____________________?
With increase in temperature, the electrical conductivity of semiconductors_____________________?
A. Increases
B. Decreases
C. Remain constant
D. Either A. or B. depends on the type of semi-conductor
Referring to the periodic table of elements, it is found that with increasing atomic number. The atomic size in the same___________________?
Referring to the periodic table of elements, it is found that with increasing atomic number. The atomic size in the same___________________?
A. Period increases
B. Period decreases
C. Group increases
D. Both ‘B’ & ‘C’
The temperature at which the magnetic property of iron disappears (i.e., it becomes nonmagnetic) and its electrical conductivity & specific heat also changes, is called the ‘Curie point’, which is ________________ °C ?
The temperature at which the magnetic property of iron disappears (i.e., it becomes nonmagnetic) and its electrical conductivity & specific heat also changes, is called the ‘Curie point’, which is ________________ °C ?
A. 768
B. 908
C. 1400
D. 1539