Explanation:
$\beta^-$ emission is due to decay of neutron in the nucleus n → p + e−.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Which source is associated with a line emission spectrum
|
(a) Electric fire |
(b) Neon street sign |
(c) Red traffic light |
(d) Sun |
The carrier frequency generated by a tank circuit containing 1 nF capacitor and 10 mH inductor is
|
(a) 1592 Hz |
(b) 1592 MHz |
(c) 1592 kHz |
(d) 159.2 Hz |
Three capacitances of capacity 10 μF, 5 μF and 5 μF are connected in parallel. The total capacity will be
|
(a) 10 μF |
(b) 5 μF |
(c) 20 μF |
(d) None of the above |
A beam of parallel rays is brought to a focus by a plano-convex lens. A thin concave lens of the same focal length is joined to the first lens. The effect of this is
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(a) The focal point shifts away from the lens by a small distance |
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(b) The focus remains undisturbed |
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(c) The focus shifts to infinity |
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(d) The focal point shifts towards the lens by a small distance |
The variation of magnetic susceptibility (x) with temperature for a diamagnetic substance is best represented by
|
(a)
|
(b)
|
(c)
|
(d)
|
If in the circuit shown below, the internal resistance of the battery is 1.5 W and VP and VQ are the potentials at P and Q respectively, what is the potential difference between the points P and Q
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(a) Zero |
(b) 4 volts (VP > VQ) |
(c) 4 volts (VQ > VP) |
(d) 2.5 volts (VQ > VP) |
99% of a radioactive element will decay between
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(a) 6 and 7 half lives |
(b) 7 and 8 half lives |
|
(c) 8 and 9 half lives |
(d) 9 half lives |
The magnetic moment of a magnet of length 10 cm and pole strength 4.0 Am will be
|
(a) |
(b) 1.6 |
(c) 20 |
(d) 8.0 |
