Physics Test 19...

An electric lamp is connected to 220 V, 50 Hz supply. Then the peak value of voltage is

In a step-up transformer the voltage in the primary is 220 V and the current is 5A. The secondary voltage is found to be 22000V. The current in the secondary (neglect losses) is

A body moves along a circular path of radius 10 m and the coefficient of friction is 0.5. What should be the angular velocity of the body, if it is not to slip on the surface?

K.E. of emitted cathode rays is dependent on

A semi circle arc of radius 'a' is charged uniformly and the charge per unit length is λ. The electric field at its centre is

A gun fires the bullets each of mass 10 g with a velocity of 50 m−s^-1. If 1000 bullets are fired per second, then thrust on the shoulder will be

An electric dipole is placed along the X-axis at the origin O. A point P is at a distance of 20 cm from this origin such that OP makes an angle π/3 with the X axis. If electric field at P makes an angle θ with X-axis, the value of θ is

A metre stick AB hinged (without friction) at the end A as shown in the figure is kept horizontal by means of a string tied to the end B, the other end of the string being tied to a hook. The string is carefully cut (or burnt), and the scale executes angular oscillations about an axis passing through the end A. What is the speed of the end B when the metre stick assumes vertical position immediately after the string is burnt? (Acceleration due to gravity = 10 ms^–2)

The logic symbols for OR, NOT and NAND gates are respectively:

In a capillary tube, water rises upto 3 mm. The height of water that will rise in another capillary tube having one-third radius of the first is