An air bubble in sphere having 4 cm diameter appears 1 cm from surface nearest to eye when looked along diameter. If amg = 1.5, the distance of bubble from refracting surface is
|
(a) 1.2 cm |
(b) 3.2 cm |
(c) 2.8 cm |
(d) 1.6 cm |
(a) 1.2 cm
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The material of wire of potentiometer is
|
(a) Copper |
(b) Steel |
(c) Manganin |
(d) Aluminium |
A primary cell has an e.m.f. of 1.5 volts, when short-circuited it gives a current of 3 amperes. The internal resistance of the cell is
|
(a) 4.5 ohm |
(b) 2 ohm |
(c) 0.5 ohm |
(d) 1/4.5 ohm |
In the nuclear reaction 
is
|
(a) |
(b) |
(c) |
(d) |
Two parallel wires of length 9 m each are separated by a distance 0.15 m. If they carry equal currents in the same direction and exerts a total force of 30 × 10–7 N on each other, then the value of current must be
|
(a) 2.5 amp |
(b) 3.5 amp |
(c) 1.5 amp |
(d) 0.5 amp |
In Milikan's oil drop experiment, a charged drop falls with terminal velocity V. If an electric field E is applied in vertically upward direction then it starts moving in upward direction with terminal velocity 2V. If magnitude of electric field is decreased to 
, then terminal velocity will become
|
(a) |
(b) V |
(c) |
(d) 2V |
