Three long, straight and parallel wires carrying currents are arranged as shown in the figure. The wire C which carries a current of 5.0 amp is so placed that it experiences no force. The distance of wire C from wire D is then
|
(a) 9 cm |
(b) 7 cm |
(c) 5 cm |
(d) 3 cm |
(a) 9 cm
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The focal lengths for violet, green and red light rays are 
and 
respectively. Which of the following is the true relationship
|
(a) |
(b) |
(c) |
(d) |
When germanium is doped with phosphorus, the doped material has
|
(a) Excess positive charge |
(b) Excess negative charge |
|
(c) More negative current carriers |
(d) More positive current carriers |
The absorption transitions between the first and the fourth energy states of hydrogen atom are 3. The emission transitions between these states will be
|
(a) 3 |
(b) 4 |
(c) 5 |
(d) 6 |
When a current passes through the junction of two different metals, evolution or absorption of heat at the junction is known as
|
(a) Joule effect |
(b) Seebeck effect |
(c) Peltier effect |
(d) Thomson effect |
If an interference pattern have maximum and minimum intensities in 36 : 1 ratio then what will be the ratio of amplitudes
|
(a) 5 : 7 |
(b) 7 : 4 |
(c) 4 : 7 |
(d) 7 : 5 |
The condition for a uniform spherical mass m of radius r to be a black hole is [G = gravitational constant and g = acceleration due to gravity]
|
(a) |
(b) |
(c) |
(d) |
The time constant of an LR circuit represents the time in which the current in the circuit
|
(a) Reaches a value equal to about 37% of its final value |
|
(b) Reaches a value equal to about 63% of its final value |
|
(c) Attains a constant value |
|
(d) Attains 50% of the constant value |
