Physics Test - ...

Directions: The following question has four choices, out of which ONE or MORE can be correct.

A uniform bar of length 6a and mass 8m lies on a smooth horizontal table. Two point masses m and 2m moving in the same horizontal plane with speed 2 v and v, respectively, strike the bar [as shown in the figure] and stick to the bar after collision. Denoting angular velocity (about the centre of mass), total energy and centre of mass velocity respectively by ω, E and v_c, we have after collision:

In Doppler's effect in sound,

The specific heat of 100 gm of a substance varies with temperature T as c = AT² + BT cal/gm/K with absolute temperature. [Given A = 2.1 10^-3 cal/g (^oC)³; B = 15 10^-2 cal/g (^oC)²].

A non conducting ring of radius R is rotating about an axis passing through its centre and perpendicular to its plane with an angular velocity ω . Charge q is uniformly distributed over its surface.

Directions: The following question has four choices, out of which ONE or MORE can be correct.

A solid sphere of uniform density and radius 4 units is located with its centre at the origin O of coordinates. Two spheres of equal radii 1 unit, with their centres respectively at A (-2, 0, 0) and B (2, 0, 0), are taken out of the solid leaving behind spherical cavities as shown in the figure. Then,

The photon emitted in n = 3 to n = 1 transition in He⁺ hits a photosensitive surface of threshold wavelength 6000 A°. The photoelectrons emitted will have __________.

A cart is moved horizontally at a constant velocity of 4 m/sec. A ball is thrown from it at a velocity of 4 m/sec and at an angle horizontally with respect to the cart. Assume that the height of the cart is very small, such that the motion of the ball is assumed to be a ground to ground projectile. If the horizontal range of the ball with respect to the ground is R1 and with respect to the cart is R2, then ______________.

For an ideal diatomic gas, the P-V diagrams are shown. The various quantities indicated in the columns are calculated. The relative values are also given.


In which graph, the energy change is 225 J and the heat capacity is more than C_V?