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.
Which of these is a second-class lever?
sugar tongs
claw hammer
plier
wheelbarrow
Correct answer is D
Examples of first class levers are pliers, scissors, a crow bar, a claw hammer, a see-saw and a weighing balance.
A wheelbarrow, a bottle opener, and an oar are examples of second class levers
Water is not a good thermometric liquid because it?
expands unevenly between 0 ºC and 4 ºC
maintains fixed density
has low freezing point
wets glass
Correct answer is D
Water is most anomalous at low temperatures, with a remarkable density maximum at 4°C.
water is not used as a thermometric liquid because it has low thermal expansivity, high specific capacity, high vapor pressure and wets glass.
0.262 m
0.664 m
0.819 m
0.455 m
Correct answer is D
pressure = p, depth/height = h, density = d, gravity = g
p = hdg
pdg=h
910010∗2000=h
0.455m
The potential energy in an elastic string of force constant k, which has an extension X is?
kX
KX2
½KX2
½K
Correct answer is C
elastic potential energy[Ee] = 12ke2.
increases non-linearly with measuring temperature
increases linearly with increasing temperature
decreases linearly with increasing temperature
decreases non-linearly ith measuring temperature
Correct answer is A
The vapor pressure of any substance increases non-linearly with temperature, often described by the Clausius–Clapeyron relation.
As the temperature of a liquid or solid increases its vapor pressure also increases.
Conversely, vapor pressure decreases as the temperature decreases.
i.e. vapor pressure is directly proportional to temperature