Nickel shows ferromagnetic property at room temperature. If the temperature is increased beyond Curie temperature,then it will show:

Nitrogen fixation in the root nodules of $Alnus$ is performed by:

In a simple harmonic oscillator,at the mean position

Temperate evergreen forests are found in

Water is filled up to a height $h$ in a beaker of radius $R$ as shown in the figure. The density of water is $\rho$,the surface tension of water is $T$ and the atmospheric pressure is $P_0$. Consider a vertical section $ABCD$ of the water column through a diameter of the beaker. The force on water on one side of this section by water on the other side of this section has magnitude

The $O-N-O$ bond angle is maximum in?