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141. If Eo be the peak e.m.f. of alternating current, then root mean square e.m.f. will be
√Eo
Eo√2
Eo/2
Eo/√2
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142. Detergent is a complex salt of
Sodium.
Calcium.
Carbon.
Magnesium.
143. Device used to send text and pictures is
Teleprinter.
Telex.
Fax.
None of these.
144. Which of the following mixtures of gases are used for welding of metals?
Oxygen + Hydrogen
Oxygen + Carbon dioxide
Oxygen + Methane
Oxygen + Acetylene
145. Symbol of Tungsten element is
W
Tl
Te
Tm
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