CSS - PMS - CCE - PCS - General Science
Blood System
Which blood component is best identified by the following principal role: mediate adaptive immune responses?
A. Eosinophils
B. Monocytes
C. Lymphocytes
D. Hemoglobin
Correct Answer: C
The blood component matching 'mediate adaptive immune responses' is Lymphocytes.
CSS - PMS - CCE - PCS - General Science
Blood System
Which principal role is correctly associated with Lymphocytes?
A. mediate adaptive immune responses
B. binds and transports oxygen in red blood cells
C. include antibodies and various transport proteins
D. rapidly phagocytose many bacteria during acute infection
Correct Answer: A
Lymphocytes is associated with mediate adaptive immune responses.
CSS - PMS - CCE - PCS - General Science
Blood System
Which blood component is best identified by the following principal role: rapidly phagocytose many bacteria during acute infection?
A. Basophils
B. Neutrophils
C. Hemoglobin
D. Eosinophils
Correct Answer: B
The blood component matching 'rapidly phagocytose many bacteria during acute infection' is Neutrophils.
CSS - PMS - CCE - PCS - General Science
Blood System
Which principal role is correctly associated with Neutrophils?
A. can enter tissues and differentiate into macrophages
B. rapidly phagocytose many bacteria during acute infection
C. release mediators such as histamine
D. mediate adaptive immune responses
Correct Answer: B
Neutrophils is associated with rapidly phagocytose many bacteria during acute infection.
CSS - PMS - CCE - PCS - General Science
Blood System
Which blood component is best identified by the following principal role: participate in primary hemostasis and blood clot formation?
A. Lymphocytes
B. Platelets
C. Fibrinogen
D. Globulins
Correct Answer: B
The blood component matching 'participate in primary hemostasis and blood clot formation' is Platelets.
CSS - PMS - CCE - PCS - General Science
Blood System
Which principal role is correctly associated with Platelets?
A. rapidly phagocytose many bacteria during acute infection
B. mediate adaptive immune responses
C. can enter tissues and differentiate into macrophages
D. participate in primary hemostasis and blood clot formation
Correct Answer: D
Platelets is associated with participate in primary hemostasis and blood clot formation.
CSS - PMS - CCE - PCS - General Science
Blood System
Which blood component is best identified by the following principal role: transport oxygen mainly through hemoglobin?
A. Monocytes
B. Red blood cells
C. Fibrinogen
D. Hemoglobin
Correct Answer: B
The blood component matching 'transport oxygen mainly through hemoglobin' is Red blood cells.
CSS - PMS - CCE - PCS - General Science
Blood System
Which principal role is correctly associated with Red blood cells?
A. include antibodies and various transport proteins
B. transport oxygen mainly through hemoglobin
C. can enter tissues and differentiate into macrophages
D. rapidly phagocytose many bacteria during acute infection
Correct Answer: B
Red blood cells is associated with transport oxygen mainly through hemoglobin.
CSS - PMS - CCE - PCS - General Science
Acid/Base
What is the safest general rule when diluting a concentrated acid?
A. Add acid slowly to water
B. Add water rapidly to acid
C. Mix with bare hands
D. Heat the acid first
Correct Answer: A
A: Correct because adding acid slowly to a larger amount of water allows heat to dissipate and reduces dangerous splashing. B: Incorrect because water added to concentrated acid can heat suddenly, boil, and splash. C: Incorrect because direct skin contact is dangerous. D: Incorrect because heating concentrated acid increases the hazard.
CSS - PMS - CCE - PCS - General Science
Acid/Base
Neutralization of a strong acid by a strong base is usually:
A. Exothermic
B. Endothermic in every case
C. A nuclear reaction
D. Without any energy change
Correct Answer: A
A: Correct because formation of water from H⁺ and OH⁻ releases heat, making strong acid–strong base neutralization exothermic. B: Incorrect because the standard reaction releases rather than absorbs heat. C: Incorrect because it involves electrons and ions, not nuclear changes. D: Incorrect because a measurable enthalpy change occurs.
CSS - PMS - CCE - PCS - General Science
Acid/Base
In Brønsted–Lowry terms, an acid–base reaction involves:
A. Transfer of a proton
B. Transfer of a neutron
C. Creation of mass
D. Only transfer of oxygen
Correct Answer: A
A: Correct because Brønsted–Lowry acid–base reactions are proton-transfer reactions. B: Incorrect because neutron transfer is a nuclear process. C: Incorrect because mass is conserved rather than created. D: Incorrect because oxygen transfer defines some redox ideas, not all acid–base reactions.
CSS - PMS - CCE - PCS - General Science
Acid/Base
A metal oxide that forms a base with water may be called:
A. Acid anhydride
B. Base anhydride
C. Conjugate acid
D. Buffer salt
Correct Answer: B
A: Incorrect because acid anhydrides form acids. B: Correct because a basic metal oxide can be considered the anhydride of the corresponding hydroxide base. C: Incorrect because a conjugate acid differs from a base by one proton. D: Incorrect because a single metal oxide is not automatically a buffer salt.
CSS - PMS - CCE - PCS - General Science
Acid/Base
A nonmetal oxide that forms an acid with water may be called:
A. Acid anhydride
B. Base anhydride
C. Neutral salt
D. Metal hydride
Correct Answer: A
A: Correct because an acidic nonmetal oxide can be viewed as the anhydride of the corresponding oxyacid. B: Incorrect because a base anhydride forms a base with water. C: Incorrect because an oxide is not a neutral salt. D: Incorrect because a hydride contains hydrogen bonded to another element.
CSS - PMS - CCE - PCS - General Science
Acid/Base
In water, a free H⁺ ion is commonly represented more realistically as:
A. H₃O⁺
B. H₂
C. OH⁻
D. O²⁻
Correct Answer: A
A: Correct because a proton associates strongly with water molecules, commonly represented as hydronium, H₃O⁺. B: Incorrect because H₂ is molecular hydrogen. C: Incorrect because OH⁻ is hydroxide. D: Incorrect because O²⁻ does not exist freely in ordinary water.
CSS - PMS - CCE - PCS - General Science
Acid/Base
At 25°C, an acidic aqueous solution normally has [OH⁻]:
A. Greater than 1 × 10⁻⁷ M
B. Equal to 1 × 10⁻⁷ M
C. Less than 1 × 10⁻⁷ M
D. Always zero
Correct Answer: C
A: Incorrect because values above 10⁻⁷ M indicate basicity. B: Incorrect because equality occurs in neutral water. C: Correct because in an acidic solution [H⁺] exceeds 10⁻⁷ M, so [OH⁻] is below 10⁻⁷ M while their product remains Kw. D: Incorrect because OH⁻ is not exactly zero because water equilibrium persists.
CSS - PMS - CCE - PCS - General Science
Acid/Base
For a weak base, the base-dissociation constant is represented by:
A. Ka
B. Kb
C. Kw
D. Kc only
Correct Answer: B
A: Incorrect because Ka is used for acids. B: Correct because Kb quantifies the equilibrium ionization or proton-accepting behavior of a weak base in water. C: Incorrect because Kw refers to water autoionization. D: Incorrect because Kc is a general equilibrium constant, but Kb is the specific base constant.
CSS - PMS - CCE - PCS - General Science
Acid/Base
A lower pKa value generally indicates:
A. A stronger acid
B. A weaker acid
C. A stronger conjugate base
D. No relationship to acid strength
Correct Answer: A
A: Correct because pKa = −log Ka, so a lower pKa corresponds to a larger Ka and stronger acid. B: Incorrect because weaker acids have higher pKa values. C: Incorrect because the conjugate base of a stronger acid is generally weaker. D: Incorrect because pKa is directly related to acid strength.
CSS - PMS - CCE - PCS - General Science
Acid/Base
A larger Ka value generally indicates:
A. A stronger acid
B. A weaker acid
C. A stronger base only
D. A neutral salt only
Correct Answer: A
A: Correct because a larger Ka means the acid equilibrium lies further toward ionized products. B: Incorrect because a weaker acid has a smaller Ka. C: Incorrect because Ka describes acid strength, not base strength alone. D: Incorrect because neutral salts are not classified by acid Ka in this way.
CSS - PMS - CCE - PCS - General Science
Acid/Base
For a weak acid, the acid-dissociation constant is represented by:
A. Ka
B. Kb
C. Kw
D. Ksp
Correct Answer: A
A: Correct because Ka quantifies the ionization equilibrium of an acid. B: Incorrect because Kb is the base-dissociation constant. C: Incorrect because Kw is the ionic product of water. D: Incorrect because Ksp is the solubility-product constant.
CSS - PMS - CCE - PCS - General Science
Acid/Base
The common-ion effect generally causes the ionization of a weak electrolyte to:
A. Increase greatly
B. Decrease
C. Remain exactly unchanged
D. Become nuclear
Correct Answer: B
A: Incorrect because Le Châtelier's principle predicts suppression, not a large increase. B: Correct because adding an ion already present shifts the equilibrium toward the unionized weak electrolyte. C: Incorrect because equilibrium composition changes. D: Incorrect because nuclear change is unrelated.