Computer Hardware part -3 . Computer most important questions. Joa it exam . Bank mains exam. Computer awareness.

In a computer lab, there are 3 computers for every 6 students. How manycomputers will be needed for 24 students?

Compute: (3!)(5!)

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

Water rises to a height of 9cm in a certain capillary tube. In the same tube the level of mercury surface is depressed by 3 cm . Compute the ratio of surface tension of water and mercury . Density of mercury 13.6 xx 10^(3) kg m^(-3) . Angle of contact of water is zero and that for mercury is 135^(@) .

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.

A manufacturer produces computers data storage floppies at the rate of x units per week and his total cost of production and marketing is C (x) = (x^(3)/(3)- 10 x^(2)+ 15 x +30) . Find the slope of average cost .

Three students use a computer for a total of 3 hours. If the first students uses the computer 28% of the total time, and the second student uses the computer 52% of the total time, how many minutes does the third student use the computer?

Compute Q_(1) and Q_(3) from the following data :

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.

Compute Q_(1) and Q_(3) from the following data: