Physics

Which of the following combination of properties would be desirable for handling a cooking pan?

The temperature of the black body as calculated from the graph is (Wien's constant = $2.89*{10}^{-3}$ )

A circular beam of light of diameter d=2cm falls on a plane surface of glass. The angle of incidence is 60⁰ and refractive index of glass is $\mu =3/2$ . The diameter of the refracted beam is:

A capacitor is of capacity $C$ and reactance $X$ . If capacitance and frequency become triple then reactance will be

If a diamagnetic substance is brought near the north or the south pole of a bar magnet, it is

A fish looking up through the water sees the outside world contained in a circular horizon. If the refractive index of water is $4/3$ and the fish is 12cm  below the surface of water, the radius of the circle in centimeter is:

At which of the following temperatures does any gas have average molecular kinetic energy double that of at ${20}^{0}C$ ?

A cannot engine works as a refrigerator between $250K$ and $300K$ . It receives $500cal$ heat from the reservoir at the lower temperature. The amount of work done in each cycle to operate the refrigerator is nearly

An object of mass $m$ is connected to a wire of length $\text{'}l\text{'}$ , radius $\text{'}r\text{'}$ and Young's modulus $\text{'}Y\text{'}$ as shown in figure. If the object is released from the horizontal position of the wire, then find out the maximum increment in length of the wire.

An alternating potential V=V₀ sin wt is applied across a circuit. As a result the current I=I₀ Sin $I=I_0 sin \left(\omega t-\frac{\pi }{2}\right)$  flows in it. The power consumed in the circuit per cycle is