The distance between principal focus and pole of mirror is called:
Principal focus
Focal length
Aperture
Image
In OR operation inputs are connected as:
Series
Parallel
Both series or parallel
None of these
The speed of sound in a liquid is …………..than that in gases:
Ten times
Fifteen times
Five times
Two times
Which combination forms NAND gate:
AND & OR
AND & NOT
NOT & OR
NAND & NOT
Which of the following quantities is not change during refraction of light:
Its direction
Its speed
Its frequency
Its wavelength
In medical field, C.R.O is used to display:
Heart beats
Pictures of organs
Pictures of bones
Blood pressure
Electron gun has an electrode called for controlling the flow of electrons in the beam:
Plate
Grid
Screen
Filament
