Q. 1 Dielectric constant for vacuum is___.
A. 100
B. 1
C. zero
D. infinite
Ans.: B
Q. 2 Which of the following insulating material used in spark plugs?
A. Mica
B. Polysterene
C. Porcelain
D. rubber
Ans.: C
Q. 3 The materials commonly used in thermocouple is __.
A. Silver-copper
B. Copper- constantan
C. iron-steel
D. all of the above
Ans.: B
Q. 4 Thermocouple work on which of the following effects?
A. Seeback effect
B. Joule law
C. Thomson effect
D. any of the above
Ans.: A
Q.5 Electric stress is expressed in _____.
A. Ohms/ cm
B. Farad / cm
C. Henry / cm
D. KV/cm
Ans.: D
Q. 6 Which of the following material has highest dielectric strength?
A. glass
B. Polysterene
C. Teflon
D. porcelain
Ans.: B
Q. 7 The electric breakdown strength of a material is depends upon.
A. thickness
B. moisture
C. composition
D. all of the above
Ans.: D
Q. 8 Magnetic recording tap is made from which of the following materials?
A. silicon-iron
B. ferric-oxide
C. iron dust
D. small particles of iron
Ans.: B
Q. 9 The common household glass is made from
A. high silica glass
B. high leaded glass
C. boro silicate glass
D. soda lime glass
Ans.: D
Q.10 silicon doped with gallium is
A. p-type semi conductor
B. n-type semi conductor
C. extrinsic semi conductor
D. intrinsic semi conductor
Ans.: A
Q. 11 Bronze is an alloy of
A. copper and tin
B. copper, lead and tin
C. copper, zinc and tin
D. copper and zinc
Ans.: D
Q.12 silicon doped with phosphorous is
A. n-type semiconductor
B. p-type semiconductor
C. intrinsic semi conductor
D. extrinsic semi conductor
Ans.: A
Q. 13 Selenium is ____ semi conductor.
A. n-type
B. p-type
C. extrinsic
D. intrinsic
Ans.: D
Q. 14 The property of material by which it can be rolled into sheets is called___.
A. malleability
B. ductility
C. plasticity
D. elasticity
Ans.: A
Q. 15 _____is piezo-electric material.
A. silica sand
B. polysterene
C. Quartz
D. plastic
Ans.: C