JEE Main Test 8...

Which one of the following is possible

A sound absorber attenuates the sound level by 20 dB. The intensity decreases by a factor of

The greatest and least values of (sin^-1χ )² + (cos^-1χ)² are respectively

Two thin wire rings each having a radius R are placed at a distance d apart with their axes coinciding. The charges on the two rings are + q and –q. The potential difference between the centres of the two rings is

A battery of emf 2.0 V and internal resistance 0.10 Ω is being charged with a current of 5.0 A. The potential difference between the terminals of the battery is

What is the potential difference between points A and B in the circuit shown?

A step-down transformer reduces the voltage of a transmission line from 2200 V to 220 V. The power delivered by it is 880 W and its efficiency is 88%. The input current is

A boat is moving due East in a region where the earth's magnetic field is 5.0 × 10^-5 NA^-1 m^-1 due North and horizontal. The boat carries a vertical aerial 2 m long. If the speed of the boat is 1.50 ms^-1 , the magnitude of the induced emf in the wire of aerial is

The equation of second degree x² + 2√2xy + 2 y² + 4x + 4√2y + 1 = 0 represents a pair of straight lines. The distance between them is

A square loop of wire, side length 10 cm is placed at angle of 45° with a magnetic field that changes uniformly from 0.1 T to zero in 0.7 s. The induced current in the loop (its resistance is 1 Ω ) is