NEET 2021 Question Paper Mock Test

From a circular ring of mass $M$ and radius $R$ an arc corresponding to a $90^{\circ }$ sector is removed. The moment of inertia of the remaining part of the ring about an axis passing through the centre of the ring and perpendicular to the plane of the ring is $K$ times $M{R}^2$. Then the value of $K$ is:

A series LCR circuit containing $5.0\text{H}$ inductor, $80\mu \text{F}$ capacitor and $40\Omega$ resistor is connected to $230\text{V}$ variable frequency ac source. The angular frequencies of the source at which power transferred to the circuit is half the power at the resonant angular frequency are likely to be:

A uniform conducting wire of length $12a$ and resistance $R$ is wound up as a current carrying coil in the shape of (i) an equilateral triangle of side $a$, and (ii) a square of side $a$. The magnetic dipole moments of the coil in each case respectively are:

A step down transformer connected to an ac mains supply of $220\text{V}$ is made to operate at $11\text{V},44\text{W}$ lamp. Ignoring power losses in the transformer, what is the current in the primary circuit?

Twenty seven drops of same size are charged at $220\text{V}$ each. They combine to form a bigger drop. Calculate the potential of the bigger drop.