Velocity of light is maximum in
(a) Vacuum
(b) Glass
(c) Diamond
(d) Water
Answer:
The refractive index of a given piece of transparent quartz is greatest for
(a) Yellow light
(b) Green light
(c) Violet light
(d) Red light
Answer:
An air bubble in water will act like a
(a) Concave mirror
(b) Concave lens
(c) Convex mirror
(d) Convex lens
Answer:
Golden view of sea shell is due to
(a) Polarization
(b) Diffraction
(c) Reflection
(d) Dispersion
Answer:
The capacitance unit of convenient size is
(a) Mega farad
(b) Kilo farad
(c) Farad
(d) Microfarad
Answer:
Ohm's law is valid in case of
(a) Conductor
(b) semiconductor
(c) Superconductor
(d) Insulstor
Answer:
Electromotive force is most closely related to
(a) Mechanical force
(b) Potential difference
(c) Electric field
(d) Magnetic field
Answer:
The conductivity of superconductor is
(a) Zero
(b) Very small
(c) Infinite
(d) Very large
Answer:
The filament of bulb is of
(a) Tungsten
(b) Mercury
(c) Copper
(d) None of these
Answer:
The core of a transformer is laminated to reduce
(a) Eddy current loss
(b) Hysteresis
(c) Copper loss
(d) Magnetic loss
Answer: