Computer Hardware part -2 . Computer most important questions. Joa it exam . Bank mains exam. Computer awareness.

Three concentric conducting spherical shells of radii R, 2R and 3R carry charges Q, - 2Q and 3Q , respectively. a. Find the electric potential at r=R and r=3R where r is the radial distance from the centre . b. Compute the electric field at r=5/2R c. Compute the total electrostatic energy stored in the system. The inner shell is now connected to the external one by a conducting wire, passing through a very small hole in the middle shell. d. Compute the charges on the spheres of radii R and 3R . e. Compute the electric field at r=5/2R

A computer producing factory has only two plants T_(1) and T_(2) . Plant T_(1) produces 20% and plant T_(2) produces 80% of the total computers produced. 7% of computers produced in the factory turn out to be defective. It is known that P(computer turns out to bedefective, given that it is produced in plant T_(1) )=10P (computer turns out to be defective, given that it is produced in plant T_(2) ), where P(E) denotes the probability of an event E.A computer produced in the factory is randomly selected and it does not turn out to be defective. Then, the probability that it is produced in plant T_(2) , is

Compute the derivative of f(x)=sin^2x .

Compute the derivative of f(x)=sin^2x .

Compute the compounded interest on Rs 12000 for 2 years at 20% per annum when compounded half-yearly.

Roma borrowed Rs 64000 from a bank for 0.5 years at the rate of 10% per annum. Compute the total compound interest payable by Roma after 0.5 years, if the interest is compounded half-yearly.

The probability that a student selected at random from class will pass in Mathematics is 4/5, and the probability that he/she passes in Mathematics and Computer Science is 1/2 . What is the probability that he/she will pass in Computer Science if it is known that he/she has passed in Mathematics?

Compute the geometric mean of 2, 4, 8.

The simple interest on a certain sum computes to रु 600 in 3 years and the compound interest on the same sum, at the same rate and for 2 years computes to रु 410. Find the rate per cent.

A company offers you the use of its computer for a fee. Plan A costs $4 6 to join and then $9 per hour to use the compound. Plan B costs $25 to join and then $2.25 per hour to use the computer. After how many minutes of use would the cost of plan A be the samee as the cost of plan B?