Physics Test-6...

The velocity field in a flow is given by, \(\overrightarrow{\mathrm{V}}=(\mathrm{x} \hat{\mathrm{i}}+\mathrm{y} \hat{\mathrm{j}}) \mathrm{m} / \mathrm{s}\). The volume flow rate through the plane ABCD will be?

A convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the lens. Then its focal length will:

The propagation of electromagnetic waves is along the direction of:

A fluid at a pressure of 3 bar and specific volume of \(0.18 \mathrm{~m}^{3} / \mathrm{kg}\) is contained in a cylinder behind a piston. The fluid expands reversibly to a pressure of \(0.6\) bar according to a law \(p=\frac{C}{v^{2}}\) where \(C\) is a constant. Calculate the work done (in \(\mathrm{kJ} / \mathrm{kg}\) ) by the fluid on the piston.

Two similarly charged bodies are kept 6 cm apart in a vacuum. If the second body is shifted away from the first by another 6 cm, their force of repulsion will be:

The radii of two planets are respectively 2R and 3R and their densities are respectively ρ₁ and ρ₂. The ratio of the accelerations due to gravity at their surfaces is:

On reflection from a rigid wall if an incident wave in a string is represented by "y(x, t) = A sin (kx – ωt)," then the amplitude of the stationary wave formed is ____________.

The figure shows the spectrum of an Amplitude Modulated wave. An additional carrier wave of same frequency but Amplitude '\(A\)' is added so that the transmitted power is reduced to \(\frac{81}{88}\) of initial power and modulation index becomes \(0.5\). The value of '\(A\)' is:

For proper working of a clamper, time constant of the circuit should be:

The torque on a rectangular coil placed in a uniform magnetic field is large when the:

If the intensity and frequency of incident light is doubled then:

Five identical resistors each of resistance R = 1500 Ω are connected to a 300 V battery as shown in the circuit. The reading of the ideal ammeter A is:

A balloon moving up in the air is based on the:

Which of the points is likely positions of the centre of mass of the system shown in the figure?

The torque acting on a dipole moment P placed in an electric field E is ________.