Post Utme Economics Past Questions and Answers

Question 916:

A toy car of mass \(8 \mathrm{~kg}\) initially at rest is accelerated at a rate of \(2 \mathrm{~m} / \mathrm{s}\) for \(3 \operatorname{secs}\). The kinetic energy of the toy car is ____________

A. 144J
B. 288J
C. \(48 \mathrm{~J}\)
D. \(96 \mathrm{~J}\)

Question 917:

The two fixed points on a thermometer are \(70 \mathrm{~cm}\) apart. When the thermometer reads \(63 \mathrm{~cm}\) above the ice point, the temperature is ____________

A. \(63^{\circ} \mathrm{C}\)
B. \(70^{\circ} \mathrm{C}\)
C. \(90^{\circ} \mathrm{C}\)
D. \(10^{\circ} \mathrm{C}\)

Question 918:

One advantage of alcohol over mercury as a thermometric fluid is that ____________

A. It expands more uniformly than mercury
B. It is a better conductor of heat than mercury
C. It has a lower freezing point than mercury
D. It has a lower specific heat capacity

Question 919:

A closed organ pipe and an open organ pipe emit notes of the same pitch. The ratio of the length of the air column in the closed pipe to that of the open pipe is ____________

A. \(2: 1\)
B. \(1: 1\)
C. \(1: 2\)
D. \(1: 4\)

Question 920:

The process by which protons are converted into helium atom with a tremendous release of energy is called____________

A. Themionic emission
B. Nuclear fission
C. Thermonuclear fission
D. Photoelectric emission