- AElectromagnetic radiation with high energy.
- BElectromagnetic radiation with low energy.
- CCharged particles emitted by the nucleus.
- DElectrons orbiting the nucleus.
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In the following circuit, 5W resistor develops 45 J/s due to current flowing through it. The power developed per second across 12 W resistor is
|
(a) 16 W |
(b) 192 W |
(c) 36 W |
(d) 64 W |
A coil of inductance 8.4 mH and resistance 6 W is connected to a 12 V battery. The current in the coil is 1.0 A at approximately the time
|
(a) 500 sec |
(b) 20 sec |
(c) 35 milli sec |
(d) 1 milli sec |
The modulation index of an FM carrier having a carrier swing of 200 kHz and a modulating signal 10 kHz is
|
(a) 5 |
(b) 10 |
(c) 20 |
(d) 25 |
In a parallel plate condenser, the radius of each circular plate is 12 cm and the distance between the plates is 5mm. There is a glass slab of 3mm thick and of radius 12 cm with dielectric constant 6 between its plates. The capacity of the condenser will be
|
(a) 144 |
(b) 40 pF |
(c) 160 pF |
(d) 1.44 μF |
If the temperature of cold junction of thermocouple is lowered, then the neutral temperature
|
(a) Increases |
(b) Approaches inversion temperature |
|
(c) Decreases |
(d) Remains the same |
The mutual characteristic curves of a triode are as shown in figure. The cut off voltage for the triode is

| (a) 0 V | (b) 2 V | (c) – 4 V | (d) 6 V |
Given a point source of light, which of the following can produce a parallel beam of light
|
(a) Convex mirror |
|
(b) Concave mirror |
|
(c) Concave lens |
|
(d) Two plane mirrors inclined at an angle of 90° |
A step index fibre has a relative refractive index of 0.88%. What is the critical angle at the corecladding interface
|
(a) 60° |
(b) 75° |
(c) 45° |
(d) None of these |
A ray of light incident at an angle θ on a refracting face of a prism emerges from the other face normally. If the angle of the prism is 5º and the prism is made of a material of refractive index 1.5, the angle of incidence is: