If temperature of an object is 140°F, then its temperature in centrigrade is
105°C
32°C
140°C
60°C
Temperature of a piece of silicon is raised from 27°C to 100°C, then its conductivity
increases
decreases
remains same
becomes zero
Three capacitors of 3, 2 and 6 µF are connected in series with a battery of 10 V. Then charge on 3 µF capacitor will be
10 µC
12 µC
14 µC
5 µC
Power factor of L-C-R circuit in resonation condition is
1
zero
A.
1
Power factor of L-C-R circuit
cos =
where Z is total impedence of circuit in resonance Z = R
∴ cos = = 1
Power factor = 1
An inductor and a capacitor are connected in an AC circuit inductance and capacitance are 1 H and 25 µF, then for maximum current, angular frequency will be (circuit is connected in series)
200 rad/s
50 rad/s
100 rad/s
150 rad/s
Spectrum of a star is shifting towards voilet colour, then the star
is going away from earth
is coming towards earth
intensity of light of star is increasing
intensity of light of star is decreasing
Work of invertor is
to change AC into DC
to change DC into AC
to regulate voltage
None of the above