Physics Test 29...

A thermally insulated vessel contains an ideal gas of molecular mass M and ratio of specific heat 1.4. The vessel is moving with speed v and is suddenly brought to rest. Assuming no heat is lost to the surrounding and vessel temperature of the gas increases by :

(R = universal gas constant)

If the mass of the bob in a simple pendulum is increased to thrice its original mass and its length is made half its original length, then the new time period of oscillation is x/2 times its original time period. Then the value of x is:

A tuning fork arrangement produces 4 beats/second with one fork of frequency 288 Hz. A little wax is applied on the unknown fork and it then produces 2 beats/s. The frequency of the unknown fork is _______ Hz.

Time period of a simple pendulum in a stationary lift is ‘T'. If the lift accelerates with g/6 vertically upwards then the time period will be :

(Where g = acceleration due to gravity)

An expression for a dimensionless quantity P is given by  where α and β are constants, x is distance; k is the Boltzmann constant and t is the temperature. Then the dimensions of α will be :

Two plates are at potentials -10V and +30V. If the separation between the plates is 2 cm then find the electric field between them.

A man wearing a bullet-proof vest stands on roller skates. The total mass is 80 kg. A bullet of mass 20 g is fired at 400 m/s. It is stopped by the vest and falls to the ground. Then what is the velocity of the man?

A bar magnet is dropped and it passes through a copper ring as shown in the diagram. The acceleration of the falling magnet while passing through the ring is

Two narrow parallel slits illuminated by a coherent monochromatic light produces an interference pattern on a screen placed at a distance D from the slits. The separation between the dark lines of the interference pattern can be increased by

A full wave rectifier circuit with diodes (D₁) and (D₂) is shown in the figure. If input supply voltage Vin = 220sin (100πt) volt, then at t = 15 m sec