Converting 4B7\(_{hexadecimal}\) to binary is?     

The modifier keys on the computer keyboard comprises of?      

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?