Which of the following plants are used as green manure in crop fields and in sandy soils?

Which of the following statements is correct?

Which of the following minerals is not remobilized in plants?

In a series $LCR$ circuit,what will be the nature of the circuit for frequencies higher than the resonance frequency?

$A$ metal disc of radius $R$ rotates with an angular velocity $\omega$ about an axis perpendicular to its plane passing through its centre in a magnetic field of induction $B$ acting perpendicular to the plane of the disc. The magnitude of the induced e.m.f. between the rim and the axis of the disc is:

The moment of inertia of a meter scale of mass $0.6\, kg$ about an axis perpendicular to the scale and located at the $20\, cm$ position on the scale in $kg\, m^2$ is (Breadth of the scale is negligible).