A. Fe203
B. Si02
C. AI2O3
D. B2O3
Related Mcqs:
- The formula __________ determines the number of electrons that can be accommodated in any level?
A. 2n2
B. 4n2
C. 2n3
D. 4ns - __________ is a hard solder?
A. Tin-lead
B. Tin-silver-lead
C. Copper-zinc
D. None of the above - Selenium is __________ semiconductor?
A. extrnisic
B. intmisic
C. N-type
D. P-type - Commonly used conducting materials are_____________?
A. copper
B. aluminium
C. both (A) and (B)
D. copper and silver
E. platinum and gold - highest conductivity_____________?
B. lowest temperature co-efficient
C. good mechanical strength
D. good corrosion resistance
E. easy solderable and drawable quality
F. all of the above - An H.R.C. fuse is_______________?
A. a ceramic body having metal and caps
B. a wire of platinum
C. a heavy cross-section of copper or aluminium
D. a ceramic tube having carbon rod inside it - Which of the following variety of copper has the best conductivity ?
A. Induction hardened copper
B. Hard drawn copper
C. Pure annealed copper
D. Copper containing traces of silicon - In a crystal, an atom vibrates at a frequency determined by_______________?
A. the heat content of the crystal
B. the temperature of the crystal
C. the stiffness of the bonds it makes with neighbors - Which of the following materials is used for making coils of standard resistances ?
A. Copper
B. Nichrome
C. Platinum
D. Manganin - The photo-electric effect occurs only when the incident light has more than a certain critical____________?
A. intensity
B. speed
C. frequency
D. wave length
