If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
The phenomenon that makes sound persist when its source has been removed is known as
acoustic vibration
rarefaction
echo
reverberation
Correct answer is D
No explanation has been provided for this answer.
blowing air over a liquid aids evaporation by
increasing its surface area
decreasing its vapour pressure
increasing its temperature
decreasing its density
Correct answer is B
if you blow dry air over the glass you blow away this extra water vapor, thereby decreasing the amount of water vapor entering the glass.
a ray of light which strikes a glass slab from air at normal incidence passes through the slab
undeviated and undisplaced at a lower speed
deviated and undisplaced at a lower speed
deviated and displaced at a lower speed
undeviated and displaced at a faster speed
Correct answer is A
The angle of refraction will be zero as the angle of incidence is zero in this case. This is a rule, that whenever a ray strikes perpendicularly or normally to a surface, no refraction will take place and hence the ray will pass through without deviating from its path.
water is a poor thermometric liquid because it
is opaque
is a poor conductor
wets glass
has low vapour pressure
Correct answer is B
No explanation has been provided for this answer.