While tuning in a certain broadcast station with a receiver, we are actually
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(a) Varying the local oscillator frequency |
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(b) Varying the frequency of the radio signal to be picked up |
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(c) Tuning the antenna |
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(d) None of these |
(a) Varying the local oscillator frequency
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Assertion : In Young’s experiment, the fringe width for dark fringes is different from that for white fringes.
Reason : In Young’s double slit experiment the fringes are performed with a source of white light, then only black and bright fringes are observed.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
A charge of 10 e.s.u. is placed at a distance of 2 cm from a charge of 40 e.s.u. and 4 cm from another charge of 20 e.s.u. The potential energy of the charge 10 e.s.u. is (in ergs)
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(a) 87.5 |
(b) 112.5 |
(c) 150 |
(d) 250 |
Near and far points of a human eye are
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(a) 0 and 25 cm |
(b) 0 and ¥ |
(c) 25 cm and 100 cm |
(d) 25 cm and ¥ |
$\frac{\text{k}_1}{\text{k}_2}$
$\sqrt{\frac{\text{k}_1}{\text{k}_2}}$
$\frac{\text{k}_2}{\text{k}_1}$
$\sqrt{\frac{\text{k}_2}{\text{k}^1}}$
A parallel plate capacitor with air as medium between the plates has a capacitance of 10 μF. The area of capacitor is divided into two equal halves and filled with two media as shown in the figure having dielectric constant 
and 
. The capacitance of the system will now be
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(a) 10 μF |
(b) 20 μF |
(c) 30 μF |
(d) 40 μF |