NEET 2018

An inductor 20 mH, a capacitor 100 $$\mu F$$ and a resistor 50 Q are connected in series across a source of emf, $$V = 10 \sin 314 t$$. The powerloss in the circuit is

A thin diamagnetic rod is placed vertically between the poles of an electromagnet. When,the current in the electromagnetis switched on, then the diamagnetic rod is pushed up, out,of the horizontal magnetic field. Hence, the rod gains gravitational potential energy. The work required to do this comes from

Current sensitive of a moving coil galvanomieter is 5 $$\frac{div}{mA}$$ and its voltage sensitivity (angular deflection per unit voltage applied ) is 20 $$\frac{div}{V}$$. The resistance of the galvanometer is

A tuning fork is used to produce resonance in a glass tube. The length of the air column in this tube can be adjusted by a variable piston. At room temperature of $$27^\circ$$C two successive resonances are produced at 20 cm and 73 cm of column length. If the frequency of the tuning fork is 320 Hz, the velocity of sound in air at $$27^\circ$$C is

The electrostatic force between the metal plates of an isolated parallel plate capacitor C having a charge Q and area A,is

A pendulum is hung from the roof of a sufficiently high building and is moving freely to and fro like a simple harmonic oscillatar. The acceleration of the bob of the pendulum is 20 $$\frac{m}{s^{2}}$$ at a distance of 5 m*fromithe mean position.The time period of oscillation

An electron falls from.rest through a vertical distance h in & uniform and vertically upward directed electric,field B. The direction of electric field is now reversed,keeping its magnitude the same. A protonisallowed to fall from rest in it through the'samejvertical distance h. The time of fall of the‘electron, in comparison to the time of fall of the proton is

The kinetic energies of a planet in an elliptical orbit about the Sun, at positions A,B and C are $$K_{A},K_{B}$$ and $$K_{C}$$, respectively AC is the major axis and SB is perpendicular to AC at the position of the Sun S as shown in the figure.Then

A solid sphere is in rolling motion. In rolling motion a body possesses translational kinetic energy $$(K_{t})$$ as well as rotational kinetic energy $$(K_{r})$$ simultaneously.The ratio $$K_{t}:(K_{t}+K_{r})$$ for the sphere is

If the mass of the Sun were tem times,smaller and the universal gravitational constant were ten times larger in magnitude , which of the following is not correct?