In the circuit shown below,the ammeter reading is zero. Then the value of the resistance $R$ is (in $\Omega$)

In which of the following reactions,$MgO$ is not formed?

The centre of mass of a system of particles does not depend on:

In the circuit shown in the figure,the reading of the voltmeter is $V_1$ when only $S_1$ is closed,the reading of the voltmeter is $V_2$ when only $S_2$ is closed,and the reading of the voltmeter is $V_3$ when both $S_1$ and $S_2$ are closed. Then:

If the mean and variance of a binomial variable $X$ are $2$ and $1$ respectively,then $P(X \geq 1)$ is equal to

The area (in square unit) of the region enclosed by the curves $y=x^2$ and $y=x^3$ is