The solution of the equation ${\log }_7\left({\log }_5\left(\sqrt{{\mathrm{x}}^2 + 5 + \mathrm{x}}\right)\right) = 0$ is

• x = - 2

• x = 2

• x = 4

• x = 5

42.

A gigabyte (GB) refers to

• 2¹⁰ bytes

• 2²⁰ bytes

• 2³⁰ bytes

• 2⁴⁰ bytes

Which of the following is a peripheral device?

• visual display unit

• Hard disk drive

• Floppy disk drive

• All of the above

Which of the following is not a general purpose application software ?

• Word processors

• Programs for playing games

• Spread-sheets

• Data communication software

Which of the following methods is surely convergent?

• Regula-Falsi method

• Balzano method

• Both (a) and (b)

• Neither (a) nor (b)

The Newton Raphson method converges fast, if f'($\mathrm{\alpha }$) is

• small

• large

• 0

• None of these

The arithmetic calculations in a computer are performed by

• input unit

• ALU

• output unit

• memory

The control structure of IF-THEN is a

• multiple selection

• double selection

• single selection

• None of these

If ${\log }_{{10}^4}\left(\mathrm{x}\right) = \mathrm{y}, \mathrm{then} {\log }_{{10}^8}\left({\mathrm{x}}^4\right)$ is equal to

• $\frac{2}{3}\mathrm{y}$

• 3y

• 4y

• 2y

Scanner is

• an input device

• an output device

• a memory device

• None of the above