1.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

2. 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’

3. 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

4. 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

5. Joining of thin foils is preferred to be done by _____________________?

A. Gamma rays
B. X-rays
C. Microwaves
D. Gas welding

6. Laser welding is widely employed in the __________________ industries ?

A. Electronic
B. Structural
C. Process
D. Heavy

7. Which of the following test is used for distinguishing among dry oils, semi-drying oils and non drying oils ?

A. Elaiden test
B. Reichert-Meissl value test
C. Hunter value test
D. Iodine value test

8. 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

9. 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’

10. 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

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