Practice Exams ChE - 21

1. A body whose temperature is 180 degF is immersed in a liquid which is kept at a constant temperature of 60 degF. In one minute, the temperature of the immersed body is 120 degF. The time it will take the body’s temperature to decrease to 90 degF is
a. 2 min
b. 3 min
c. 1.5 min
d. 2 hrs
e. none of the above

2. A line 2x + ky - 11 = 0 is perpendicular to 5x - 3y + 4 = 0. The value of k is
a. 4/3
b. 3/5
c. 5/12
d. 10/3
e. none of the above

3. The area in the second quadrant of the circle x^2 + y^2 = 36 is revolved about the line y + 10 = 0. What is the volume generated?
a. 2208.53
b. 2218.33
c. 2228.83
d. 2233.43

4. It measures the resistance to twisting the member.
a. force
b. shear
c. torque
d. stress
e. none of the above

5. Find the area of the triangle whose vertices lie at the points (4,1), (6,2) and (2,5).
a. 4
b. 6
c. 5
d. 7
e. none of the above

6. A series of equal semi-annual payments of P1000 for 3 years is equivalent to what present amount at an interest rate of 12% compounded annually? (All answers are rounded to the nearest peso).
a. 4944
b. 4500
c. 4804
d. 5401
e. none of the above

7. In a pile of logs, each layer contains 1 more log than the layer above and the top layer contains 1 log. If there are 171 logs, how many layers are there?
a. 20
b. 16
c. 18
d. 14
e. none of the above

8. The driver of a car traveling at 24 m/s sees a cow on the road. Calculate the stopping distance if the driver’s reaction time before applying the brakes is 0.75 sec and the car’s deceleration after the brakes are applied is 3.6 m^2/s.
a. 89.0 m
b. 85.5 m
c. 93.0 m
d. 98.0 m
e. none of the above

9. A garden hose with a cross-sectional area of 2 sq cm has flow of 200 cm^3/s. What I the average velocity of water?
a. 1.5 m/s
b. 2.5 m/s
c. 2.0 m/s
d. 1.0 m/s
e. none of the above

10. A series of equal quarterly deposits of P1000 extends over a period of 3 years. What is the future worth of this quarterly deposit series at % interest compounded monthly?
a. 13,160
b. 13,615
c. 12,590
d. 13,112
e. none of the above