DAT : Dental Admission Test Exam

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Question: 969
If two gases, A and B, have the same temperature and pressure but different molar masses, which of the following statements about their molecular speeds is accurate according to Graham's Law of Effusion?
rate of effusion is directly proportional to the square root of the molar mass. Both gases will effuse at the same rate regardless of molar mass.
B will effuse faster than gas A if it has a higher molar mass. er: D
nation: Graham's Law states that the rate of effusion is inversely proportional to the square r olar mass; thus, the gas with a lower molar mass will effuse faster.
ion: 970
mist is exploring the mechanism of a reaction that converts an alkene to an alcohol using bor ed by oxidation. What type of addition does this process represent?
rkovnikov addition.
-Markovnikov addition. ctrophilic addition. cleophilic addition.
er: B
nation: The hydroboration-oxidation process results in anti-Markovnikov addition, where the is formed at the less substituted carbon.
Gas A will effuse faster than gas B if it has a higher molar mass.
The C.
D. Gas Answ
Expla oot of
the m
Quest
A che ane
follow
1. Ma
2. Anti
3. Ele
4. Nu
Answ Expla
alcohol
Question: 971
A chemist observes that a certain liquid has a high surface tension and low vapor pressure. Which of the following intermolecular forces could explain these properties?
1. Strong hydrogen bonding
2. Weak London dispersion forces
3. Strong ionic interactions
4. Dipole-induced dipole interactions Answer: A
Explanation: High surface tension and low vapor pressure are indicative of strong hydrogen bonding, which creates cohesive forces among liquid molecules, resulting in a higher energy requirement to escape into the vapor phase.
ion: 972
the significance of the integration values in a 1H NMR spectrum, and how should they be eted in the context of molecular structure?
egration values reflect the molecular weight of the compound.
egration values provide qualitative information without quantitative implications. egration values are irrelevant when determining the functional groups present. egration values indicate the number of protons contributing to each signal.
er: D
nation: The integration values in a 1H NMR spectrum directly correlate with the number of p buting to each signal, providing crucial quantitative information for molecular structure mination.
ion: 973
ndergoes meiosis to produce gametes. If a diploid organism has 16 chromosomes, how ma osomes will each gamete contain after meiosis is completed?
Quest
What is interpr
1. Int
2. Int
3. Int
4. Int Answ
Expla rotons
contri deter
Quest
A cell u ny
chrom
1. 32
2. 16
3. 4
4. 8
Answer: D
Explanation: Meiosis reduces the chromosome number by half. Thus, a diploid organism with 16 chromosomes will produce haploid gametes containing 8 chromosomes.
Question: 974
What type of reaction occurs when an alkene reacts with a peroxyacid to form an epoxide?
1. Hydrohalogenation
2. Electrophilic addition
3. Cycloaddition
4. Nucleophilic substitution Answer: C
nation: The reaction of an alkene with a peroxyacid involves a cycloaddition mechanism that ormation of an epoxide, which is a three-membered cyclic ether.
ion: 975
a phase change experiment, a student observes the latent heat involved when ice melts to w of the following statements correctly describes the nature of latent heat?
the energy required to change the temperature of a substance. the heat capacity of a solid.
the total energy of a substance at a given temperature.
the energy absorbed or released during a phase change without changing the temperature. er: D
nation: Latent heat is the energy absorbed or released during a phase change, such as melting without a change in temperature of the substance.
ion: 976
periment was conducted to determine the effect of temperature on enzyme activity. The resea
Expla results
in the f
Quest
During ater.
Which
1. It is
2. It is
3. It is
4. It is Answ
Expla or
boiling,
Quest
An ex rchers
found that as the temperature increased from 20°C to 37°C, the reaction rate increased. However, at temperatures above 50°C, the reaction rate drastically decreased. What phenomenon best explains the decrease in reaction rate at elevated temperatures?
1. Competitive inhibition
2. Decreased pH levels
3. Increased substrate concentration
4. Denaturation of the enzyme Answer: D
Explanation: At elevated temperatures, enzymes can denature, losing their functional shape, which decreases the reaction rate significantly.
Question: 977
What is the primary effect of increased nuclear charge on the periodic trends of atomic radii and ionization energies?
omic radii decrease and ionization energies increase mic radii increase and ionization energies decrease
mic radii remain unchanged while ionization energies fluctuate h atomic radii and ionization energies decrease
er: A
nation: Increased nuclear charge typically results in a decrease in atomic radii due to stronger ion between the nucleus and electrons, and an increase in ionization energies as more energy ed to remove an electron.
ion: 978
boratory setting, a chemist prepares two solutions, one containing a non-electrolyte and the o electrolyte. How would the freezing point depression compare between the two solutions?
non-electrolyte solution will have a greater depression. Both will have the same freezing point depression.
strong electrolyte solution will have a greater depression. results are inconclusive.
er: C
At
Ato
Ato
Bot Answ
Expla
attract is
requir
Quest
In a la ther a
strong
A. The B.
1. The
2. The Answ
Explanation: The strong electrolyte dissociates into more ions, leading to a greater depression of the freezing point compared to a non-electrolyte, which does not dissociate.
Question: 979
In which scenario would you expect to see a downfield shift in the chemical shift of a proton in 1H NMR, and what is the underlying reason for this shift?
1. When the proton is in a highly symmetrical environment.
2. When the proton is attached to a carbon that is sp3 hybridized.
3. When the proton is attached to a carbon adjacent to a highly electronegative atom.
4. When the proton is shielded by neighboring electron-donating groups. Answer: C
Explanation: A downfield shift occurs when the proton is attached to a carbon adjacent to highly electronegative atoms, leading to deshielding and increased chemical shift values.
ion: 980
n alkyne is subjected to hydrogenation in the presence of Lindlar's catalyst, what type of pr med?
kane
omatic compound ene
dehyde er: C
nation: Hydrogenation of an alkyne using Lindlar's catalyst selectively yields a cis-alkene. T allows the reaction to stop at the alkene stage without reducing it further to an alkane.
ion: 981
tion's concentration is expressed as 2.5 M. How many grams of NaCl would be needed to pr mL of this solution? (Molar mass of NaCl = 58.44 g/mol)
61 g
22 g
Quest
When a oduct
is for
1. Al
2. Ar
3. Alk
4. Al
Answ
Expla his
catalyst
Quest
A solu epare
500
1. 14.
2. 29.
C. 116.88 g
D. 58.44 g
Answer: B
Explanation: To find the mass, use the formula: mass = molarity × volume × molar mass. Here, mass = 2.5 mol/L × 0.5 L × 58.44 g/mol = 73.05 g.
Question: 982
Which muscle group is primarily involved in the flexion of the forearm at the elbow joint, playing a crucial role in various lifting movements?
1. Biceps brachii
2. Triceps brachii
3. Brachialis
nation: The biceps brachii is the major muscle responsible for flexing the forearm at the elbo ularly during lifting and pulling movements.
ion: 983
type of error is most likely to occur when a laboratory technician misreads a measurement due isinterpretation of the scale, and how can it be addressed?
tematic error; can be addressed through proper training and calibration nders; can be rectified by implementing double-check systems
ndom error; can be minimized by increasing the number of measurements trumental error; can be fixed by replacing faulty equipment
er: B
nation: Misreading a measurement due to visual misinterpretation is classified as a blunder, w addressed by implementing double-check systems to enhance accuracy.
ion: 984
Deltoids Answer: A
Expla w,
partic
Quest
Which to
visual m
1. Sys
2. Blu
3. Ra
4. Ins Answ
Expla hich
can be
Quest
Given the electron configuration of an element as [Kr]5s²4d¹°5p³, determine the molecular geometry of the most stable compound formed by this element when it reacts with hydrogen.
1. Tetrahedral
2. Pyramidal
3. Octahedral
4. Trigonal bipyramidal Answer: D
Explanation: The given electron configuration corresponds to an element in group 15. When it forms a compound with hydrogen, it typically adopts a trigonal bipyramidal geometry due to the presence of lone pairs and bonding pairs.
Question: 985
In a nucleophilic substitution reaction, if the substrate is a tertiary alkyl halide and the nucleophile is a strong base, which mechanism is most likely to dominate?
er: C
nation: Tertiary alkyl halides favor the E2 mechanism when reacted with strong bases, as the lly hindered and have a low chance of undergoing SN2.
ion: 986
study on animal behavior reveals that a particular species of birds engages in cooperative breedi on-breeding individuals assist in raising the young of others. This behavior is primarily an le of:
ruism selection
ource competition ritoriality
er: B
E1
SN1
E2
SN2
Answ
Expla y are
sterica
Quest
A ng,
where n examp
1. Alt
2. Kin
3. Res
4. Ter Answ
Explanation: Kin selection is a form of natural selection where behaviors that help relatives reproduce are favored, as seen in cooperative breeding among birds.
Question: 987
A dental hygienist records the time (in minutes) spent on each patient as follows: 30, 45, 30, 60, and 45. What is the variance of the time spent?
A. 75
B. 50
C. 25
D. 30
Answer: B
30+45+30+60+45
Explanation: Mean µ = 5 = 42. Variance =
(30-42)2 +(45-42)2 +(30-42)2 +(60-42)2 +(45-42)2 = 50
5 .
Question: 988
In a clinical study, 60% of patients reported improvement with a new treatment. If 100 patients are treated, what is the expected number of patients that will report improvement?
1. 50
2. 60
3. 70
4. 80
Explanation: Expected value = 0.60 × 100 = 60 patients.
Question: 989
A dentist charges $100 per procedure. If a patient pays with a 10% discount coupon, what will be the final amount paid by the patient?
A. $90 B. $95 C. $85 D. $80
Answer: A
Answer: B
Explanation: Discount amount = 10% of $100 = $10. Final amount = $100 - $10 = $90.
Question: 990
A dental clinic has a 5-day work week. If the clinic serves an average of 25 patients per day, what is the total number of
patients served in a month (assuming 4 weeks)?
1. 200
2. 400
3. 500
Answer: C
Explanation: Total patients in a month =
25 patients/day × 5 days/week × 4 weeks = 500.
Question: 991
A dentist reports that the current average age of patients is 35 years with a standard deviation of 8 years. What percentage of patients are older than 43 years?
A. 16%
B. 20%
C. 25%
D. 10%
600
Answer: A
8
Explanation: Z-score for 43: z = (43-35)
right of z = 1 is approximately 16%.
= 1. The area to the
Question: 992
A. 60
B. 50
C. 40
D. 70
Answer: A
Explanation: Reduction = 80 × 0.25 = 20 units. New plaque level = 80 - 20 = 60.
Question: 993
In a random sample of 50 patients, 30 are male. What is the probability that a randomly selected patient from this sample is female?
A new dental product claims to reduce plaque by 25%. If the initial plaque level is 80 units, what will be the new plaque level after using the product?
1. 0.4
2. 0.6
3. 0.5
4. 0.3
Answer: A
Explanation: Total patients = 50. Male patients = 30, thus
20
female patients = 50 - 30 = 20. Probability = 50
40%.
A dentist has a 90% success rate for a particular procedure. What is the probability that out of 10 procedures, exactly 9 will be successful?
A. 0.327
B. 0.387
C. 0.348
D. 0.278
Answer: B
Explanation: Using the binomial probability formula:
10 9 1
P (X = 9) = ( 9 )(0.9) (0.1) . Calculating gives
approximately 0.387.
Question: 994
= 0.4 or
Question: 995
If a dentist's revenue is expected to grow by 15% annually, what would be the revenue after 2 years if the current revenue is $200,000?
A.
$130,000
B.
$220,000
C.
$271,000
D. $264,500
Explanation: Future revenue = 200, 000 × (1 + 0.15)2 = 200, 000 × 1.3225 = 264, 500.
Question: 996
A dental study shows that the probability of cavities decreases by 25% when a new toothpaste is used. If the initial probability of cavities is 0.4, what is the new probability?
A. 0.3
B. 0.25
C. 0.35
D. 0.1
Answer: A
Answer: D
Explanation: New probability = 0.4 - (0.25 × 0.4) = 0.4 - 0.1 = 0.3.
Question: 997
A clinic has a 70% patient retention rate. If 200 patients are surveyed, how many patients are expected to return for follow- up?
1. 130
C. 150
D. 160
Answer: B
Explanation: Expected return = 0.70 × 200 = 140.
Question: 998
A dentist has a 4:1 ratio of dental hygienists to dentists. If there are 5 dentists, how many dental hygienists are there?
A. 15
B. 20
C. 25
D. 10
140
Answer: B
Explanation: If the ratio is 4:1, then for every 1 dentist, there are 4 hygienists. Thus, 5 × 4 = 20 hygienists.
Question: 999
A dental office operates 5 days a week and sees an average of 30 patients each day. If the office is closed for a week, how many patients will it miss?
B. 120
C. 180
D. 240
Answer: A
Explanation: Patients missed = 30 patients/day × days = 150.
Question: 1000
In a survey, 80% of patients reported satisfaction with their dental visits. If 50 patients were surveyed, how many reported satisfaction?
A. 32
150
5
40
45
50
Answer: B
Explanation: Satisfied patients = 0.80 × 50 = 40 patients.
Question: 1001
A. 5
B. 7
C. 8
D. 10
Answer: C
Explanation: Expected cancellations = 0.10 × 80 = 8.
Question: 1002
If the average number of cavities per patient is 2, and a dentist sees 50 patients, what is the expected total number of cavities?
A. 50
B. 100
A dentist's practice has a 10% cancellation rate. If 80 patients are scheduled for a day, how many are expected to cancel?
1. 75
2. 80
Answer: B
Explanation: Expected cavities = 2 cavities/patient ×
50 patients = 100.
Question: 1003
A. $170 B. $180 C. $190 D. $150
Answer: A
Explanation: Discount amount = 0.15 × 200 = 30. Final amount = 200 - 30 = 170.
A dental clinic charges $200 for a procedure. If a patient pays with a 15% discount, what will be the final amount paid?

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