Physics Questions and Answers
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.
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
\(\frac{p}{dg} = h\)
\(\frac{9100}{10 * 2000} = h\)
0.455m
The potential energy in an elastic string of force constant k, which has an extension X is?
kX
KX\(^{2}\)
½KX\(^{2}\)
½K
Correct answer is C
elastic potential energy[Ee] = \(\frac{1}{2} ke^2\).
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