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Free gk questions Online Test - MeritNotes
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Online Exam
No. of Questions :10
Remaining Time :
1. In a power transformer, for maximum efficiency at a given load,
(a)
there is no correlation between frequency and losses
(b)
copper loss must be greater than iron loss
(c)
copper loss must be equal to iron loss
(d)
copper loss must be less than iron loss
2. A transformer transforms
(a)
voltage
(b)
power
(c)
frequency
(d)
energy
3. The most abundant of the rare gases in the air is
(a)
argon
(b)
ammonia
(c)
hydrogen
(d)
ozone
4. The voltage drop across the electrodes of a mercury pool rectifier
(a)
is almost independent of load current
(b)
varies inversely as load current
(c)
varies linearly with the load current
(d)
varies exponentially with the load current
5. Which of the following mineral crystallizes in hexagonal system?
(a)
quartz
(b)
gypsum
(c)
flint
(d)
all of the above
6. The internal resistance of a cell is
(a)
the resistance of the minimum length of wire required to connect its electrodes
(b)
the resistance of its container
(c)
the resistance of its solution
(d)
the resistance of its electrodes
7. Eddy currents in DC shunt generator
(a)
vary as inverse of speed
(b)
vary inversely as square of the lamination thickness
(c)
vary as square of speed
(d)
vary with speed
8. An air bubble in water shines because of the phenomenon of
(a)
total internal reflection
(b)
refraction
(c)
diffraction
(d)
dispersion
9. Which of the following mineral exhibit twinkling effect?
(a)
hematite
(b)
galena
(c)
borax
(d)
calcite
10. Which one of the following is not a central conic
(a)
circle
(b)
hyperpola
(c)
ellipse
(d)
parabola
