Physics Test - ...

In the absence of intermolecular forces of attraction, the observed pressure P will be

The variation of photoelectric current given by the photocell with the intensity of light, is given by a graph, which is a straight line with

The K_α X-ray emission line of tungsten occurs at λ= 0.021 nm. The energy difference between K and L levels in this atoms is about

An infinitely long conductor PQR is bent to form a right angle as shown in figure. A current I flows through PQR . The magnetic field due to this current at the point M is H1 Now, another infinitely long straight conductor QS is connected at Q , so that current is I/2 in QR as well as in QS. The current in PQ remaining unchanged. The magnetic field at M is now H₂ . The ratio H₁ is given by

Which one among the following shows particle nature of light ?

The wavelength of maximum energy, released during an atomic explosion was 2.93 × 10⁻¹⁰ m. Given that the Wien's constant is 2.93 × 10⁻³ m-K, the maximum temperature attained must be of the order of

In the phenomenon of diffraction of light, when blue light is used in the experiment instead of red light, then

Eight point charges (can be assumed as small spheres uniformly charged and their centres at the corner of the cube) having values q each are fixed at vertices of a cube. The electric flux through square surface ABCD of the cube is

If two mirrors are kept at 60^o to each other, then the number of images formed by them is

Two identical wires have the same fundamental frequency of 400 Hz when kept under the same tension. If the tension in one wire is increased by 2%, the number of beats produced will be