Explanation:
In a beta decay, either a neutron is converted to a proton or a proton is converted to a neutron such that the mass number does not change. Also, the number of the nucleons present in the nucleus remains the same. Thus, the active nucleus gets converted to one of its isobars after beta decay.
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Two long parallel wires P and Q are both perpendicular to the plane of the paper with distance 5 m between them. If P and Q carry current of 2.5 amp and 5 amp respectively in the same direction, then the magnetic field at a point half way between the wires is
|
(a) |
(b) |
(c) |
(d) |
A battery of e.m.f. E and internal resistance r is connected to a variable resistor R as shown here. Which one of the following is true
|
(a) Potential difference across the terminals of the battery is maximum when R = r |
|
(b) Power delivered to the resistor is maximum when R = r |
|
(c) Current in the circuit is maximum when R = r |
|
(d) Current in the circuit is maximum when R >> r |
The colour of the second line of Balmer series is
| (a) Blue | (b) Yellow |
(c) Red |
(d) Violet |
Light energy emitted by stars is due to
|
(a) Breaking of nuclei |
(b) Joining of nuclei |
|
(c) Burning of nuclei |
(d) Reflection of solar light |
To compare magnetic moments of two magnets by vibration magnetometer, 'sum and difference method' is better because
|
(a) Determination of moment of inertia is not needed which minimises the errors |
| (b) Less observations are required |
| (c) Comparatively less calculations |
| (d) All the above |
