Post Utme Physics Past Questions and Answers

Question 1131:

A uniform meter rule \(AB\) has a mass \(15 g\). A \(30 g\) mass is suspended at the \(10.0 cm\) mark, and another \(5 g\) mass is suspended at the \(65.0 cm\) mark. Calculate the position of the fulcrum that will keep the meter rule balanced horizontally.

A. \(50.0 cm\)
B. \(32.0 cm\)
C. \(27.5 cm\)
D. \(17.9 cm\)

Question 1132:

A rectangular block measures \(40 cm \times 25 cm \times 5 cm\) and is made of a material of density \(7800 kg / m ^{3}\). Calculate the pressure the block exerts on the floor when it stands on the smallest of its surfaces.

A. \(3.12 \times 10^{3} N / m ^{2}\)
B. \(3.00 \times 10^{3} N / m ^{2}\)
C. \(1.95 \times 10^{4} N / m ^{2}\)
D. \(3.12 \times 104 N / m ^{2}\)

Question 1133:

A ship sinks in the bottom of a \(250 m\) deep lake. The atmospheric pressure over the lake is \(103 \times 10\) s Pa. Taking the density of water in the lake to be \(1000 kg / m ^{3}\), calculate the pressure exerted on the boat.
[Acceleration due to gravity \(\left.=10 m / s ^{2}\right]\)

A. \(2.60 \times 10^{6} Pa\)
B. \(2.50 \times 10^{6} Pa\)
C. \(2.60 \times 105 Pa\)
D. \(1.63 \times 105 Pa\)

Question 1134:

Three knives made of steel, plastic and flat wood respectively are placed on a table for an equal amount of time. The steel knife feels coldest to touch because ____________

A. The steel knife has the lowest temperature
B. The plastic and wooden knives have absorbed more heat from the environment than the steel knife
C. Both wooden and plastic knives have lower densities than the steel knife
D. The steel knife conducts heat faster from the finger than the wooden and plastic knives

Question 1135:

The coefficient of linear expansion of aluminum is \(23 \times 10^{6} K ^{-1}\). If the volume of a pot made with aluminum at temperature \(T_{0}\) is \(V_{11}\), what will be the change in temperature resulting in a decrease of \(0.20 \%\) in volume of the pot?

A. \(-87^{\circ} C\)
B. \(+487^{\circ} C\)
C. \(+428^{\circ} C\)
D. \(-29^{\circ} C\)