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General Science
➤ Physics ➤ 1
Question 76
Q76.
On a rainy day, small oil films on water show brilliant colours. This is due to
dispersion
interference
diffraction
polarization
Question 77
Q77.
Point A is at a lower electrical potential than point B. An electron between them on the line joining them will
move towards A
move towards B
move at right angles to the line joining A and B
remain at rest
Question 78
Q78.
Materials for rain-proof coats and tents owe their water-proof properties to
surface tension
viscosity
specific gravity
elasticity
Question 79
Q79.
RADAR is used for
locating geostationary satellites
locating submerged submarines
receiving a signals in a radio receiver
detecting and locating the position of objects such as aeroplanes
Question 80
Q80.
Sound of frequency below 20 Hz is called
audio sounds
ultrasonic
infrasonic
supersonics
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