Physics Test 54...

Two ideal junction diodes D₁ and D₂ are connected to a battery as shown in the figure. What is the current supplied by the battery if its terminals are interchanged?

A passenger train moving at a speed of 5 ms^-1 is followed by an express train moving on the same track at a speed of 30 ms^-1. The rear side of the passenger train is at some distance. The driver of the express train applies brakes to avoid a collision. If the retardation due to brakes is 4 ms^-2, then find the time in which the accident is avoided after the application of brakes.

A table tennis ball that has been covered with a conducting point is suspended by a light thread so that it hangs between two metal p.a.es. One plate is earthed, while the other is attached to a high voltage generator, the ball

The ratio of nuclear radii and nuclear densities of ₂₆Fe⁵⁶ and ₉₂U²³⁸ is

In Young's double slit experiment, if the distance between the slits and the screen is doubled and the separation between the slits is reduced to half, the fringe width

The phase difference between two waves represented by where x is expressed in metres and t is expressed in seconds, is approximately

The maximum number of possible interference maxima for slit-separation equal to twice the wavelength in Young's double-slit experiment, is

An ideal gas has pressure ′p′, volume ′v′ and absolute temperature  ′T′. It ′m′ is the mass of each molecule and ′K′ is the Boltzmann constant, the density of the gas is

If a transformer of an audio amplifier has an input impedance of 8Ω and output impedance of 8 kΩ, the primary and secondary turns of this transformer connected between the output of the amplifier and to loudspeaker should have the ratio

An inductor of self-inductance 100 mH and a resistor of resistance 50 Ω, are connected to a 2 V battery. The time required for the current to come to half its steady value is