A pressure cooker saves both time and fuel in cooking because inside the cooker, the
boiling point of water is raised
pressure is constant
heat is completely trapped
temperature is evenly distributed
volume of steam varies
Correct answer is A
When atmospheric pressure increases, the boiling point becomes higher, and when atmospheric pressure decreases (as it does when elevation increases), the boiling point becomes lower.
The water at the bottom of a waterfall is slightly warmer than that at the top because part of the
potential energy raises the water temperature
water absorbs latent heat from the atmosphere
kinetic energy is changed into internal energy
dropping mass of water increases the heat capacity
A and C above
Correct answer is C
No explanation has been provided for this answer.
Which of the following does NOT cause a reduction of the surface tension of water?
soap solution
detergent
alcohol
camphor
grease
Correct answer is E
No explanation has been provided for this answer.
The motion of the moving skin of a talking drum can rightly be described as
translational
random
rotational
oscillatory
transitory
Correct answer is D
No explanation has been provided for this answer.
0.36
0.46
0.56
0.76
0.86
Correct answer is C
Heat lost = heat gained
moCoθo = mwCwθw
100 x Co x (25 - 9) = 150 x Cw x (15 - 9)
CwCw = 0.56