Physics

Two equal capacitors are first connected in series and then in parallel. The ratio of the equivalent capacities in

A cell E₁ of emf 6V and internal resistance $2\Omega$ is connected with another cell E₂ of emf 4V and internal resistance $8\Omega$  (as shown in the figure). The potential difference across points X and Y is:

Given below are two statements:

Statements I : Two photons having equal linear momenta having equal waelengths

Statements II : If the wavelength of photon is decreases, then the momentum and energy of a photon will also decrease.

In the light of the above statements, choose the correct answer from the options given below.

Consider two satellites S₁ and S₂ with periods of revolution 1hr. and 8 hr. respectively revolving around a planet in circular orbits. The ratio of angular velocity of satellite S₁ to the angular velocity of satellites S₂ is:

An electromagnetic wave of frequency 5 GHz, is travelling in a medium whose relative electric permittivity and relative magnetic permeability both are 2. Its velocity in the this medium is_____* 10⁷ m/s.

A common transistor ratio set requires 12V (D.C) for its operation. The D.C source is constructed by using a transformer and a rectifier circuit, which are operated at 220V (A.C) on standard domestic A.C, supply. The number of turns of secondary coil are 24, then the number of turns of primary are___________.

An unpolarized light beam is incident on the polarizes of a polarization experiment and the intensity of light beam emerging from the analyzer is measured as 100 Lumens. Now, if the analyzer is rotated around the horizontal axis (direction of light) by 30° in clockwise direction, the intensity of emerging light will be________ Lumens.

An inclined plane in bent in such a way that the vertical cross-section is given by y  where y is in vertical and x in horizontal direction. If the upper surface of this curved plane is rough with coefficient of friction = 0.5, the maximum height in cm at with a stationary block with not skip downward is ____________cm.

A ball with a speed of 9m/s collides with another identical ball at rest. After the collision the direction of each ball makes an angle 30° with the original direction. The ratio of velocities of the balls after collision is x : y, where x is_________.

A resonance circuit having inductance and resistance 2 * 10^-4 H and 6.28 $\Omega$  respectively oscillates at 10 MHz frequency. The value of quality factor of this resonator is__________.

[p = 3.14]