A converging mirror with a radius of 20cm creates a real image 30 cm from the mirror. What is the object distance:
5.0 cm
7.5 cm
15 cm
20 cm
The technique or method used to absorb undesirable sounds by soft and porous surface is called:
Ultrasonic
Acoustic protection
Infrasonics
Echo
Which is not a hardware:
CPU
Window
Keyboard
Mouse
Eight bits combine to form:
A byte
Megabyte
Kilobyte
Gigabyte
1.6x10-19 J= :
1F
1N
1eV
Half of radius of curvature is called:
Focal length
Principal focus
Axis
Aperture
The intensity level of train siren is:
150 dB
100 dB
130 dB
120 dB