Physics Test 12...

A battery of emf 20V and internal resistance 6 Ω is connected to a resister as shown in figure. If the current in the circuit is 1A, the resistance of the resistor will be

Given a current carrying wire of non-uniform cross-section. Which one of the following is constant through out the length of wire

An electric bulb marked 40 W and 200 V, is used in a circuit of supply voltage 100 V. Its power is

A moving coil galvanometer is converted into an ammeter reading upto 0.03 A by connecting a shunt of resistance 4r across it and into ammeter upto 0.06 A, when a shunt of resistance r is used, what is the maximum current which can be sent through this galvanometer if no shunt is used

A galvanometer can withstand safely a maximum current of 5 mA. It is converted into voltmeter reading upto 20V by connecting in series an external resistance of 3.96 k Ω .The resistance of galvanometer is

Three resistors of 2 Ω , 3 Ω and 4 Ω  are connected as shown in the given diagram, then the equivalent resistance will be

Assertion : The capacity of conductor, under given circumstances remains constant irrespective of the charge present on it

Reason: Capacity depends on size and shape of conductor and also on the medium between the plates.

Assertion: A small metal ball is suspended in a uniform electric field with an insulated thread. If high energy X-ray beam falls on the ball, the ball will be deflected in the electric field.

Reason : X-rays emit photoelectrons and metal becomes negatively charged

Assertion: If a point charge be rotated in a circle around a charge, the work done will be zero.

Reason: Work done is equal be dot product of force and displacement.

Assertion: At a point in space, the electric field points towards north, In the region, surrounding this point the rate or change of potential will be zero along the east and west

Reason: Electric field due to a charge is the space around the charge in which some another charge experienced a force