A short bar magnet with its north pole facing north forms a neutral point at P in the horizontal plane. If the magnet is rotated by 90o in the horizontal plane, the net magnetic induction at P is (Horizontal component of earth’s magnetic field = 
)
|
(a) 0 |
(b) 2 |
(c) |
(d) |
(d) 
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The radio waves of frequency 300 MHz to 3000 MHz belong to
|
(a) High frequency band |
(b) Very high frequency band |
|
(c) Ultra high frequency band |
(d) Super high frequency band |
For copper-iron (Cu-Fe) couple, the thermo e.m.f. (temperature of cold junction = 0℃) is given by E = (14θ – 0.02
)μV. The neutral temperature will be
|
(a) 350 ℃ |
(b) 350 K |
(c) 560℃ |
(d) 560 K |
A light bulb, a capacitor and a battery are connected together as shown here, with switch S initially open. When the switch S is closed, which one of the following is true
|
(a) The bulb will light up for an instant when the capacitor starts charging |
|
(b) The bulb will light up when the capacitor is fully charged |
|
(c) The bulb will not light up at all |
|
(d) The bulb will light up and go off at regular intervals |
Assertion : A narrow pulse of light is sent through a medium. The pulse will retain its shape as it travels through the medium.
Reason : A narrow pulse is made of harmonic waves with a large range of wavelengths.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If assertion is false but reason is true. |
In the above question, potential difference across the 40Ω resistance will be
|
(a) Zero |
(b) 80 V |
(c) 40 V |
(d) 120 V |
