Two long parallel wires carrying equal current separated by 1m, exert a force of 2 
on one another. The current flowing through them is
|
(a) 2.0 A |
(b) 2.0 |
(c) 1.0 A |
(d) 1.0 |
(c) 1.0 A
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Which of the following quantities related to a lens depend on the wavelength or wavelengths of the incident light?
The current in a coil changes from 4 ampere to zero in 0.1 s. If the average e.m.f. induced is 100 volt, what is the self inductance of the coil
|
(a) 2.5 H |
(b) 25 H |
(c) 400 H |
(d) 40 H |
When two magnetic moments are compared using equal distance method the deflections produced are 45o and 30o. If the length of magnets are in the ratio 1 : 2, the ratio of their pole strengths is
|
(a) 3 : 1 |
(b) 3 : 2 |
(c) |
(d) 2 |
A parallel plate air capacitor is charged and then isolated. When a dielectric material is inserted between the plates of the capacitor, then which of the following does not change
|
(a) Electric field between the plates |
(b) Potential difference across the plates |
|
(c) Charge on the plates |
(d) Energy stored in the capacitor |
62.5 
electrons per second are flowing through a wire of area of cross-section 0.1
, the value of current flowing will be
|
(a) 1 A |
(b) 0.1 A |
(c) 10 A |
(d) 0.11 A |
A 4 mF capacitor, a resistance of 2.5 MW is in series with 12 V battery. Find the time after which the potential difference across the capacitor is 3 times the potential difference across the resistor. [Given ln(2)= 0.693]
|
(a) 13.86 s |
(b) 6.93 s |
(c) 7 s |
(d) 14 s |
Maximum useable frequency (MUF) in F-region layer is x, when the critical frequency is 60 MHz and the angle of incidence is 70°. Then x is
|
(a) 150 MHz |
(b) 170 MHz |
(c) 175 MHz |
(d) 190 MHz |
Three resistors each of 2 ohm are connected together in a triangular shape. The resistance between any two vertices will be
|
(a) 4/3 ohm |
(b) 3/4 ohm |
(c) 3 ohm |
(d) 6 ohm |
