Practice Exams ChE - 26

1. If the roots of the equation are zero, then they are classified as
a. conditional solution
b. extraneous roots
c. hypergolic solution
d. trivial solution
e. none of the above

2. The sum of the interior angles of a polygon is 2700 degrees. How many sides are there?
a. 15
b. 16
c. 17
d. 18
e. none of the above

3. The volume of a sphere is increasing at the rate of 6 cm^3/hr. At what rate is its surface area increasing when radius is 40 cm?
a. 0.4 sqcm/hr
b. 0.3 sqcm/hr
c. 0.2 sqcm/hr
d. 0.9 sqcm/hr

4. What horizontal force P can be applied to a 100 kg block in a level surface with a coefficient of friction of 0.20 that will cause an acceleration of 2.5 m/s^2?
a. 446.2 N
b. 224.5 N
c. 53.8 N
d. 343.5 N
e. none of the above

5. An object falls from a height of 92 m and strikes the ground with a speed of 19 m/s. What is the acceleration?
a. 1.96 m/s^2
b. 9.81 m/s^2
c. x + y = 3
d. 3x + 4y = -3
e. 2y – 33 x = 11

6. A cable weighing 60 N, is suspended between 2 supports on the same level at 300 m apart. The sag is 60.0 m. Compute the distance of the lowest point of the cable from the ground level.
a. 188.2 m
b. 196.8 m
c. 205.5 m
d. 200.5 m
e. none of the above

7. The volume of any solid of revolution is equal to the generating area times the circumference of the circle described by the centroid of the area. This is known as
a. 1st Proposition of Pappus
b. 2nd Proposition of Pappus
c. Simpson’s rule
d. Cavalier’s principle

8. The curve represented by the equation r = 6 is
a. a circle
b. parabola
c. ellipse
d. line
e. none of the above