NEET 2019
For the following questions answer them individually
Six similar bulbs are connected as shown in the figure with a DC source of emf E, and zero internal resist ance. The ratio of power consumption by the bulbs when (i) all are glowing and (ii) in the situation when two from section A and one from section B are glowing, will be:
A mass m is attached to a thin wire and whirled in a vertical circle. The wire is most likely to break when:
In which of the following processes, heat is neither absorbed nor released by a system ?
Two point charges A and B, having charges +Q and -Q respectively, are placed at certain distance apart and force acting between them is F. If 25% charge of A is transferred to B, then force between the charges becomes:
When an object is shot from the bottom of a long smooth inclined plane kept at an angle $$60^\circ$$ with horizontal, it can travel a distance $$x_1$$ along the plane. But when the inclination is decreased to $$30^\circ$$ and the same object is shot with the same velocity, it can travel $$x_2$$ distance. Then x_1 : x_2 $$ will be:
A solid cylinder of mass 2 kg and radius 4 cm is rotating about its axis at the rate of 3rpm. The torque required to stop after $$2 \pi$$ revolutions is:
In a double slit experiment, when light of wavelength 400 nm was used, the angular width of the first minima formed on a screen placed 1 m away, was found to be $$0.2^\circ$$. What will be the angular width of the first minima, if the entire experimental apparatus is immersed in water ? $$(\mu_{water} = 4/3)$$
A parallel plate capacitor of capacitance $$20 \mu F$$ is being charged by a voltage source whose potential is changing at the rate of 3 V/s. The conduction current through the connecting wires, and the displacement current through the plates of the capacitor, would be, respectively :
The speed of a swimmer in still water is 20 m/s. The speed of river water is 10 m/s and is flowing due east. If he is standing on the south bank and wishes to cross the river along the shortest path, the angle at which he should makeh is strokes w.r.t. north is given by:
