Arrange in hierarchical order by date the following inventions:

I. - Census machine; Il. - Abacus; lll. - Slide rule; IV.- Difference engine.

A student mistakenly pressed the F5 key on keyboard while browsing on the internet. This will lead to?

Opening an already existing sequential file in output (O) mode will lead to?

(a) What are input devices?

(b) list two input devices
(c) State two uses of logic gates
(d) Draw and label the logic gate symbol for;
(i) OR gate (ii) AND gate

State one difference between star and bus topologies

(b) List four common network devices.
(c) Write the acronyms below in full

HTML, HTTP, ISP, SMTP.