Physics Test 22...

The relative densities of four liquids A , B , C and D are 1.26 , 1.0 , 0.8 , and 13.5 respectively. And object is floated in all these liquids one by one. In which liquid the object will float with its maximum volume submerged under the liquid?

An alternating emf is given by V = 400 sin (100 πt) volt. The rms value of the emf is:

The spacing of one set of crystal planes in Nacl is d = 0.282 nm. A monochromatic beam of X-Rays produces a Bragg’s maximum when glancing angle with these planes is 7°. Assuming this is the second order maximum. The wavelength of X-Rays used is (sin 7° = 0.122)

The shortest wavelength in the Lyman series of the hydrogen spectrum is 912 Å. The shortest wavelength present in Paschen series of spectral lines will be:

In the following combination of logic gates, the outputs of A, B and C are respectively

Which of the following statement is incorrect?

A uniform sphere of mass 500 g rolls without slipping on a plane horizontal surface with its centre moving at a speed of 5.00 cm/s. Its kinetic energy is :

A staircase has five steps each 10 cm high and 10 cm wide. What is the minimum horizontal velocity to be given to the ball, so that it hits directly the lowest plane from the top of the staircase? (Take, g = 10 m/s²)

A thin circular ring of mass M and radius R is rotating about its axis with a constant angular velocity ω. Two objects each of mass ‘m’ are attached gently to the opposite ends of a diameter of the ring. The ring will now rotate with an angular velocity –

A geostationary satellite is orbiting the earth at a height of 7 R above the surface of the earth, R being the radius of the earth. The time period of another satellite at a height of 3R from the surface of earth is: