Which one of the following relations on R is equivalence relation

Let R = {(x, y) : x, y A, x + y = 5} where A = {1, 2, 3, 4, 5} then

Hence, the given relation is not reflexive, symmetric and not transitive

Let be a relation defined by Then R is

Hence, the given relation is Reflexive, transitive but not symmetric.

The relation R defined in N as aRb b is divisible by a is

Hence, the given relations is reflexive but not symmetric.

Electric power =

n equal resistors are first connected in series and then in parallel. The ratio of the equivalent resistance in the two cases is

The equivalent resistance of the network shown in the adjoining figure between the points A and B is

A current of 4.8 A is flowing in a conductor. The number of electrons passing through any cross-section per second is

Equivalent resistance between points P and Q in the adjoining figure is

The S.I. unit of surface charge density is _____.

A car of mass 1500 kg. If the speed of car is changed from 30 km/h to 60 km/h, then the work done by car is

A body of mass 2 kg is held 3 m above the floor of a room. The potential energy of the body relative to the floor is (g = 9.8 m/s²)

A force of 5 N acts on a body of weight 9.8 N. The acceleration produced in m/s² is

Frictional force is directly proportional to the

A machine gun has a mass of 20 kg. It fires 25 g bullets at the rate of 600 bullets per minute with a speed of 200. The recoil velocity of gun is

Action and reaction