Physics Test 13...

The temperature at which proton in hydrogen gas would have enough energy to overcome a barrier of  is (Boltzmann constant = )

A simple pendulum attached to the ceiling of a stationary lift has a time period T. The distance y covered by the lift moving upwards varies with time t as y = t² where y is in meters and t in seconds. If g = 10m / s², the time period of pendulum will be

The transverse displacement y (x, t) of a wave on a string is given by This represents a:

A semi-circular arc of radius ‘a’ is charged uniformly and the charge per unit length is λ. The electric field at the center of this arc is

Identify the false statement.

If voltage across a bulb rated 220 Volt-100 Watt drops by 2.5% of its rated value, the percentage of the rated value by which the power would decrease is:

Two tangent galvanometers A and B have coils of radii 8 cm and 16 cm respectively and having resistance of  each. They are connected in parallel with a cell of emf 4V and negligible internal resistance. The deflections produced in the tangent galvanometers A and B are 30° and 60° respectively. If A has 2 turns, then B must have

If the susceptibility of diamagnetic, paramagnetic and ferromagnetic materials are  respectively, then

Figure shows a conducting rod of negligible resistance that can slide on smooth U-shaped rail made of wire of resistance  Position of the conducting rod at t = 0 is shown. A time t dependent magnetic field B = 2t tesla is switched on at t = 0.

At t = 0, when the magnetic field is switched on, the conducting rod is moved to the left at constant speed 5cm/ s by some external means. The rod moves perpendicular to the rails. At t = 2s, induced emf has magnitude