hard qs || reminders || refresher Flashcards
Data Analysis 1
Both the bus and you get to the bus stop at random times between 12pm and 1pm.
When the bus arrives, it waits for 5 minutes before leaving. When you arrive, you wait for 20 minutes before leaving if the bus doesn’t come. What is the probability that you catch the bus?
a. 103/288
b. 1/4
c. 47/144
d. 15/16
103/288
Probability
A spider eats three flies a day.
Until he fills his quota, he has an even chance of catching any fly that attempts to pass. A fly is about to make the attempt.
What are the chances of survival, given that five flies have already made the attempt today?
A. 1/2
B. 1/4
C. 3/4
D. 2/3
survive — 3/4
not surviving — 1/4
Probability
Assume that a single depth charge has a probability of 1/2 of sinking a submarine, 1/4 of damage and 1/4 of missing. Assume also that two damaging explosions sink the sub. What is the probability that 4 depth charges will sink the sub?
A. 5/256
B. 251/256
C. 1/256
D. 255/256
251/256
Probability
Senku tries to solve a really hard problem once each day.
He has a ¼ probability of solving it each day. What is the probability that he will solve it before his seventh try?
a) 0.718
C) 0.282
b) 0.178
d) 0.822
0.822
how to solve:
get undesired/ complementary:
1-P = Q
Prob= 1-Q^n
Econ: EE Board October 1993
A bank pays one percent interest on savings accounts four times a year. The effective annual interest rate
yung i hindi dinivide sa 4
ERI= (1+ 0.01)^4 - 1
Economics
Problem 963 (from 1001 Book)
A housewife bought a brand new washing machine costing P 12,000 if paid in cash. However, she can purchase it on installment basis to be paid within 5 years. If money is worth 8% compounded annually, what is her yearly amortization if all payments are to be made at the beginning of each year?
A. P 2,782.85
B. P 2,872.58
C. P 2,400.00
D. P 2,827.58
C sa book at pinoybrix
A sa chegg
nagkaiba sa n years -6 or -5
Age Problem
Problem 149:
At present, the sum of the parents’ ages is twice the sum of the children’s ages.
Five years ago, the sum of the parents’ ages was 4 times the sum of the children’s ages. Fifteen years hence, the sum of the parents’ ages will be equal to the sum of the children’s ages. How many children are there?
A. 3
B. 4
C. 5
D. 6
C. 5
to solve:
—magmumultiply ng n sa years ng children
Inorganic Chemistry
What is the organic molecular formula for a certain organic polychlorinated biphenyl similar to chlorinated insecticides if the compound contains 3.95% Carbon, 1.3138% hydrogen, and 58.95% chlorine with a molecular mass of 360.89?
A. C14H8C114
C. C10H8C112
B. C6H2C113
D. C12H6C116
D
Farmer problem
- A farmer has a 7-year rotation of corn, soybeans, and wheat and 4 years of alfalfa.
Manure will be applied before corn and wheat and before seeding to alfalfa. The initial soil test results indicate total phosphorus level of 48 kg P/hectare.
Manure is to be surface-applied in mid-March and disk-incorporated within 2 days of application.
One-third of the organic nitrogen and 50% of the nitrogen from NH4 is available to the corn crop. To obtain the desired yield of corn, the local extension agent has told the farmer to apply 100 kg of nitrogen per hectare.
Calculate the available nitrogen per kilogram of manure and the kilograms of manure per hectare that must be applied to meet the corn’g nitrogen needs.
A. 5gN/kg manure; 20000 g manure/ha
C. 18gN/kg manure; 30000 g manure/ha
B. 36gN/kg manure; 60000kg manure/ha
D. 5gN/kg manure; 15000 g manure/ha
5kg Nitrogen/kg Manure
2000g manure/ha
Envi Engg
A contaminated soil is to be excavated and treated in a completely mixed aerated lagoon at a Superfund site. To determine the time it will take to treat the contaminated soil, a laboratory completely mixed batch reactor is used to gather the following data.
Determine the time to achieve 99% reduction in the original concentration.
day 1, C= 280
day 16, C= 132
92 days
ratio and proportion
t sa baba: 16-1
Envi Engg
- Mr. and Mrs. Konzzumer have no children. In an average week they purchase and bring into their house approximately 50 kg of consumer goods (food, magazines, newspapers, appliances, furniture, and associated packaging).
Of this amount, 50% is consumed as food. Half of the food is used for biological maintenance and ultimately released as CO2.
The remainder is discharged to the sewer system. The Konzzumers recycle approximately 25% of the solid waste that is generated. Approximately 1 kg accumulates at the house. Estimate the amount of waste they place at the curb each week.
18
50(.50) = 25 kg solid waste
25 kg solid waste - 1kg accumulated = 24 kg
24 kg —> sewer
24(.25) = 6 recycled
24-6 = 18
Ans: 18
Envi Engg
- A newly graduate chemical engineer was assigned to team of engineers in food processing plant. The problem given was to determine the best locations for new two plants, considering two possible areas where rivers were available. The following data were given:
Plant B-B
Envi Engg
- Determine the BEST combination of plant and location to BEST conserve the environment, given the following data:
kd = deoxygenation rate constant
kr = reaeration rate constant
Tc = travel time of wastewater discharge
D = oxygen deficit
DO = dissolved oxygen actual concentration
Choose:
pinaka mababa na D
pinakamataas na DO
Gen Chem
Laughing gas/Tear Gas Problem
- A Chemical Engineer joined Pilipinas Got Talent as a Magician that can perform marvelous feats. For the finals, he claims that he can make
make the audience instantaneously smile or cry by, simply waving his hand. To execute his thick, If he releases
releases laughing gas from the front
and tear gas at the rear of a 201 row hall, which row will inevitably smile and cry at the same time?
A: 67th Row
B: 93rd Row
C: 108th Row
D: 134th Row
134th Row
• use Graham’s Law
• yung tear gas - pinag average yung MW
• equal yung time ng TG and LG
Checal 1
- In the Deacon process for the manufacture of chlorine, HCI and Oz react to form Cl2 and H2O. Sufficient air is fed to provide 35% excess oxygen and the fractional conversion of HCl is 85%.
Calculate the mole fraction of water in the product stream.
a. 0.18
c. 0.10
b. 0.12
d. 0.15
0.1775
pag may given na % xs at % conversion, magtable soln para mas mabilis
