Post Utme Economics Past Questions and Answers

Question 996:

Determine the quantity of heat in joules given out when a piece of iron of mass \(40 \mathrm{~g}\) and specified heat capacity \(460 . \mathrm{kg}^{\circ} \mathrm{C}\) cools from \(70^{\circ} \mathrm{C}\) to \(40^{\circ} \mathrm{C} .\)

A. \(552 \mathrm{~J}\)
B. \(736 \mathrm{~J}\)
C. 1288J
D. \(368.1\)

Question 997:

Which of the following is not a characteristic of the image formed in a plane mirror ____________

A. The same size as the object
B. As far behind the mirror as the object is in front
C. Real
D. Laterally inverted

Question 998:

The angle between a plane mirror and an incident ray is \(35^{\circ}\). Find the angle of reflection.

A. \(55^{\circ}\)
B. \(50^{\prime \prime} \)
C. \(45^{\circ}\)
D. \(70^{\prime}\)

Question 999:

Which of the following properties of radiations from radioactive substances is FALSE?

A. Gamma rays are deflected by a magnetic field
B. Alpha particle is a helium nucleus
C. Beta rays are streams of high energy electrons
D. Beta rays are strongly deflected by a magnetic field

Question 1000:

A machine with a velocity ratio of 6 requires \(800 . J\) of work to raise a load of \(640 \mathrm{~N}\) through a vertical distance of \(1 \mathrm{~m}\). Find the efficiency of the machine ____________

A. \(20 \%\)
B. \(64 \%\)
C. \(80 \%\)
D. \(75 \%\)