Chemaphy
IT
- 1.
An object is thrown horizontally from the open window of a building. If the initial speed of the object is 20 m/s and it hits the ground 2.0 s later, from what height was it thrown? (Neglect air resistance and assume the ground is level.)
- A.
4.9 m
- B.
9.8 m
- C.
10.0 m
- D.
19.6 m
- E.
39.2 m
Correct Answer
D. 19.6 m -
- 2.
A resistor in a circuit dissipates energy at a rate of 1 W. If the voltage across the resistor is doubled, what will be the new rate of energy dissipation?
- A.
0.25 W
- B.
0.5 W
- C.
1 W
- D.
2 W
- E.
4 W
Correct Answer
E. 4 W -
- 3.
De Broglie hypothesized that the linear momentum and wavelength of a free massive particle are related by which of the following constants?
- A.
Planck’s constant
- B.
Boltzmann’s constant
- C.
The Rydberg constant
- D.
The speed of light
- E.
Avogadro’s number
Correct Answer
A. Planck’s constant -
- 4.
An atom has filled n = 1 and n = 2 levels. How many electrons does the atom have?
- A.
2
- B.
4
- C.
6
- D.
8
- E.
10
Correct Answer
E. 10 -
- 5.
The energy from electromagnetic waves in equilibrium in a cavity is used to melt ice. If the Kelvin temperature of the cavity is increased by a factor of two, the mass of ice that can be melted in a fixed amount of time is increased by a factor of
- A.
2
- B.
4
- C.
8
- D.
16
- E.
32
Correct Answer
D. 16 -
- 6.
A heat pump is to extract heat from an outdoor environment at 7°C and heat the environment indoors to 27°C. For each 15,000 J of heat delivered indoors, the smallest amount of work that must be supplied to the heat pump is approximately
- A.
500 J
- B.
1000J
- C.
1,100 J
- D.
2000 J
- E.
2,200J
Correct Answer
B. 1000J -
- 7.
According to the BCS theory, the attraction between Cooper pairs in a superconductor is due to
- A.
The weak nuclear force
- B.
The strong nuclear force
- C.
Vacuum polarization
- D.
Interactions with the ionic lattice
- E.
The Casimir effect
Correct Answer
D. Interactions with the ionic lattice -
- 8.
During a hurricane, a 1,200 Hz warning siren on the town hall sounds. The wind is blowing at 55 m/s in a direction from the siren toward a person 1 km away. With what frequency does the sound wave reach the person? (The speed of sound in air is 330 m/s.)
- A.
1,000 Hz
- B.
1,030 Hz
- C.
1,200 Hz
- D.
1,400 Hz
- E.
1,440 Hz
Correct Answer
C. 1,200 Hz -
- 9.
True statements about the absorption and emission of energy by an atom include which of the following? I. An atom can only absorb photons of light that have certain specific energies. II. An atom can emit photons of light of any energy. III. At low temperature, the lines in the absorption spectrum of an atom coincide with the lines in its emission spectrum that represent transitions to the ground state.
- A.
I only
- B.
III only
- C.
I and II only
- D.
I and III only
- E.
I, II, and III
Correct Answer
D. I and III only -
- 10.
The reaction of magnesium with elemental iodine, I2, yields magnesium iodide. Write a balanced chemical equation for this reaction.
- A.
2 Mg(s) + I2(s) � 2 MgI(s)
- B.
Mg(s) + 2 I(s) � MgI2(s)
- C.
4 Mg(s) + I2(s) � 2 Mg2I(s)
- D.
Mg(s) + 2 I2(s) � MgI4(s)
- E.
Mg(s) + I2(s) � MgI2(s)
Correct Answer
E. Mg(s) + I2(s) � MgI2(s) -
- 11.
Hund's rule states that the most stable arrangement of electrons (for a ground state electron configuration)
- A.
Has two electrons per orbital, each with opposing spins.
- B.
Has two electrons per orbital, each with identical spins.
- C.
Only occurs for s and p-block elements.
- D.
Has a filled valence shell of electrons.
- E.
Has the maximum number of unpaired electrons, all with the same spin.
Correct Answer
E. Has the maximum number of unpaired electrons, all with the same spin. -
- 12.
At constant temperature, 10.0 L of N2 at 0.983 atm is compressed to 2.88 L. What is the final pressure of N2?
- A.
0.283 atm
- B.
0.293 atm
- C.
2.98 atm
- D.
3.41 atm
- E.
28.3 atm
Correct Answer
D. 3.41 atm -
- 13.
Nitrogen and oxygen form an extensive series of oxides with the general formula NxOy. What is the empirical formula for an oxide that contains 63.65% nitrogen?
- A.
N2O
- B.
NO
- C.
NO2
- D.
N2O3
- E.
N2O5
Correct Answer
A. N2O -
- 14.
A rectangular box has dimensions of 20.0 cm X 15.0 cm X 8.00 cm. Calculate the volume of the box in liters.
- A.
2.40 X 10-3 L
- B.
4.30 X 10-3 L
- C.
2.40 L
- D.
43.0 L
- E.
2.40 X 103 L
Correct Answer
C. 2.40 L -
- 15.
If 1.928 g KNO3 is dissolved in enough water to make 250.0 mL of solution, what is the molarity of potassium nitrate?
- A.
6.912 X 10-4 M
- B.
4.767 X 10-3 M
- C.
7.627 X 10-2 M
- D.
1.297 X 10-1 M
- E.
7.712 M
Correct Answer
C. 7.627 X 10-2 M -
- 16.
A 25.00 mL sample of NaOH is titrated with 15.23 mL of 0.2250 M HCl. What is the concentration of the NaOH solution?
- A.
2.198 X 10-3 M
- B.
0.02872 M
- C.
0.1371 M
- D.
0.3693 M
- E.
0.5223 M
Correct Answer
C. 0.1371 M -
- 17.
In order to form a set of sp3d hybrid orbitals, how many pure atomic orbitals must be mixed?
- A.
One s, one p, and one d
- B.
One s, three p, and one d
- C.
Two s, one p, and two d
- D.
Two s, six p, and two d
- E.
None of the above
Correct Answer
B. One s, three p, and one d -
- 18.
Which one of the following substances will exhibit dipole-dipole intermolecular forces?
- A.
Kr
- B.
N2
- C.
CO2
- D.
CCl4
- E.
CO
Correct Answer
E. CO -
- 19.
Acetic acid is an organic acid found in vinegar. In the lab a student reacts a 200.0 mL sample of acetic acid with 0.125 M solution of NaOH for a compete neutralization process. Which of the following functional groups does acetic acid have?
- A.
Amine
- B.
Carboxylic acid
- C.
Alcohol
- D.
Ester
Correct Answer
B. Carboxylic acid -
- 20.
A World Series batter hits a home run ball with a velocity of 132 ft/s at an angle of 26° above the horizontal. A fielder who has a reach of 7 ft above the ground is backed up against the bleacher wall, which is 386 ft from the home plate. The ball was 3 ft above the ground when hit. How high above the fielder's glove does the ball pass?
- A.
121 ft
- B.
123ft
- C.
65ft
- D.
15ft
Correct Answer
D. 15ft -
- 21.
Given that two samples of 5g of H2O, at 20⁰C have the same temperature, if one combines these two samples, they will have
- A.
Half as much thermal energy as one sample
- B.
Way too much energy
- C.
Twice as much thermal energy as only one
- D.
None of the above
Correct Answer
C. Twice as much thermal energy as only one -
- 22.
Which of the following are metalloids?
- A.
As, N, P
- B.
F, Cl, Br
- C.
As, Si, Ge
- D.
Si, C, Ga
Correct Answer
B. F, Cl, Br -
- 23.
Which one of the following is a physical change?
- A.
Bread rising through the use of baking soda
- B.
Peaches rotting
- C.
Burning coal
- D.
Boiling water
Correct Answer
D. Boiling water -
- 24.
A kitchen floor has an area of 543ft2. How many 1ft2 tiles are needed to cover the floor completely?
- A.
23
- B.
230
- C.
543
- D.
1086
Correct Answer
C. 543 -
- 25.
A 60g tennis ball approaches a racket at 30m/s, is in contact with the racket’s string for 5ms, and then rebounds at 30m/s. What was the average force the racket exerted on the ball?7
- A.
700 N
- B.
800 N
- C.
720 N
- D.
820 N
Correct Answer
D. 820 N -
- 26.
The Bureau of Agricultural Statistics (BAS) collects data on retail prices of selected agricultural commodities in major trading centers and reports these prices in the BAS Media Service. The report includes the prevailing price, lowest price and highest price. Which of the following gives a quick measure of the variability of the price data.
- A.
VARIANCE
- B.
RANGE
- C.
FRACTILES
- D.
MEAN
Correct Answer
B. RANGE -
- 27.
A ball is thrown at 20 m/s at an angle of 65⁰ above the horizontal. The ball leaves the thrower hand at a height of 1.80m. At what height will it strike the wall 10m away?
- A.
14.4m
- B.
16.4m
- C.
15.4m
- D.
17.6m
Correct Answer
B. 16.4m -
- 28.
The null hypothesis is “the percentage of men who score 45 points or more (out of 50 points) on a statistics test at AMA Computer College is the same as the percentage of women who score 45 points or more.” The alternate hypothesis is “the percentage of men who score 45 points or more (out of a 50 point test) on a statistics test at AMA Computer College is more than the percentage of women who score 45 points or more.” The appropriate hypothesis test to perform and distribution to use is
- A.
A. A test of two population proportions, independent groups; student-t distribution.
- B.
B. A test of a single population proportion; Normal distribution
- C.
C. A test of two population means, independent groups; Normal distribution
- D.
D. A test of two population proportions, independent groups; Normal distribution
Correct Answer
D. D. A test of two population proportions, independent groups; Normal distribution -
- 29.
. The amount of soda contained in a can for a certain brand of soda is normally distributed with a population standard deviation of 0.1 ounces. A random sample of 40 cans of soda was selected and the amount of soda in each can was measured. The sample mean was 12.03 ounces and the sample standard deviation was 0.08 ounces. What is the appropriate distribution to use when calculating a confidence interval for the true mean amount of soda contained in all cans of this brand?
- A.
A. The student-t distribution, because the sample standard deviation is given.
- B.
B. The student-t distribution, because the repair costs are approximately normally distributed.
- C.
C. The standard normal distribution, because the population standard deviation is known.
- D.
D. The standard normal distribution, because the sample mean is known
Correct Answer
C. C. The standard normal distribution, because the population standard deviation is known. -
- 30.
A study was conducted among widowed senior citizens to determine the degree of satisfaction of their present life. An index of satisfaction was formulated to measure their general satisfaction. Six factors were considered, namely, age at the time of first marriage (X1), annual income (X2), number of children living (X3), value of all assets (X4), status of health in the form of an index (X5), and the average number of social activities per week – such as bowling and dancing (X6). Suppose the multiple regression equation is: Y = 16.24 + 0.017X1 + 0.0028X2 + 42X3 + 0.0012X4 + 0.19X5 + 26.8X6 What is the estimated index of satisfaction of a widowed senior citizen who first married at age 18, has three children living, has an annual income of P26,500, has assets valued at P156,000, has an index of health status of 141, and has an average of 2.5 social activities a week?
- A.
497.736
- B.
356.754
- C.
453.672
- D.
423.964
Correct Answer
A. 497.736 -
- 31.
. A group of 11 street children wanted to form a dance crew, with the intention of auditioning for Talentadong Pinoy. Suppose that a talent scout promised to sponsor the group’s expenses on costumes and accessories only if the group’s average height is at least 5’1” with an average absolute deviation of not larger than 2.5”. If the heights of the 11 street children are 5’2”; 4’8”; 5’0”, 5’1.5”; 5’3”; 5’0”; 4’10”, 4’8”; 5’4”; 5’1”, and 5’4”, will the group qualify for the sponsorship?
- A.
A. No, because the average height of the group is less than 5’1” with an average absolute deviation of exactly 2.5 inches.
- B.
B. Yes, because the average height of the group is exactly 5’1” with an average absolute deviation of less than 2.5 inches.
- C.
C. No, because the average height of the group is less than 5’1” with an average absolute deviation of less than 2.5 inches.
- D.
D. Yes, because the average height of the group is more than 5’1” with an average absolute deviation of less than 2.5 inches.
Correct Answer
C. C. No, because the average height of the group is less than 5’1” with an average absolute deviation of less than 2.5 inches. -
- 32.
An auto analyst is conducting a satisfaction survey, sampling from a list of 10,000 new car buyers. The list includes 2,500 Ford buyers, 2,500 GM buyers, 2,500 Honda buyers, and 2,500 Toyota buyers. The analyst selects a sample of 400 car buyers, by randomly sampling 100 buyers of each brand. Is this an example of a simple random sample?
- A.
A. Yes, because each buyer in the sample was randomly sampled.
- B.
B. Yes, because each buyer in the sample had an equal chance of being sampled.
- C.
C. No, because car buyers of every brand were equally represented in the sample.
- D.
D. No, because every possible 400-buyer sample did not have an equal chance of being chosen.
Correct Answer
D. D. No, because every possible 400-buyer sample did not have an equal chance of being chosen. -
- 33.
. In a pyramid network, two persons recruit 4 persons; 4 persons recruit 8 persons; 8 persons recruit 16 more persons; and so forth. How many persons will be included in the network after 8 steps of recruitment?
- A.
78
- B.
84
- C.
120
- D.
540
Correct Answer
D. 540 -
- 34.
Why does ozone not form in high concentrations in the atmosphere above 50 km?
- A.
Insufficient molecules exists for removal of excess energy from ozone upon its formation.
- B.
The atomic oxygen concentration is too low at high altitudes.
- C.
Light of the required wavelength is not available at those altitudes.
- D.
There is insufficient oxygen.
Correct Answer
A. Insufficient molecules exists for removal of excess energy from ozone upon its formation. -
- 35.
A motorist wanted to determine the most popular color of car for the year 2012 among Honda Civic owners. The most appropriate data collection method to use is____.
- A.
Experimental method
- B.
Observational method
- C.
Survey method
- D.
Utilizing existing records
Correct Answer
D. Utilizing existing records -
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Dec 09, 2011Quiz Edited by
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