What is the frequency of the sound made by a siren having a disc with 32 holes and making 25 revolution per seconds?

The diagram above represents the field pattern obtained by bringing the poles of two magnets together.The poles must be

A uniform light rod is kept in horizontal equilibrium under the influence of fore forces as shown above, which of the following equations correctly represent...

A capacitor of 10µF is connected across a cell of 12 volts as shown above, calculate the energy stored in the capacitor

The figure above shows the heights of two liquids X and Y when some air is sucked out of the apparatus through the pump P. The diameter of the table in X is ...

PQRS is rectangular cell with PQ perpendicular to the magnetic field as shown above. If a current flows in the the direction PQRS in what direction will the ...

In the diagram above, the hanging mass m2 is adjusted until m1 is on the verge of sliding. The coefficient of static friction between the mass m1 and the tab...

The diagram above shows a meter bridge in which two of thee arms contain resistances R and 2Ω. A balance point is obtained at 60cm from the left end , calcul...

The circuit diagram above contains four ammeters W, X, Y and Z, Which of the following statements about the ammeter readings is correct