- AA free neutron can transform itself into photon
- BA free proton can transform itself into neutron
- CIn beta minus decay, the electron originates from nucleus
- DAll of the above
Explanation:
In beta minus decay, a neutron decays into a proton, an electron.
A free neutron is unstable, decaying to a proton, electron and antineutrino.
Inside a nucleus, a proton can transform into a neutron via inverse beta.
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Assertion : In transistor common emitter mode as an amplifier is preferred over common base mode.
Reason : In common emitter mode the input signal is connected in series with the voltage applied to the base emitter function.
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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. |

The magnetic susceptibility is negative for
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(a) Paramagnetic materials |
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(b) Diamagnetic materials |
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(c) Ferromagnetic materials |
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(d) Paramagnetic and ferromagnetic materials |
An electric line of force in the xy plane is given by equation
. A particle with unit positive charge, initially at rest at the point x = 1, y = 0 in the xy plane
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(a) Not move at all |
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(b) Will move along straight line |
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(c) Will move along the circular line of force |
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(d) Information is insufficient to draw any conclusion |
A man is 180 cm tall and his eyes are 10 cm below the top of his head. In order to see his entire height right from toe to head, he uses a plane mirror kept at a distance of 1m from him. The minimum length of the plane mirror required is
| (a) 180 cm | (b) 90 cm | (c) 85 cm | (d) 170 cm |