MCQs Test For MCAT Students
For More MCAT & ECAT MCQS Knowledge
Questions and Answers
- 1.
Cloning is a technology for achieving
- A.
Biology aims
- B.
Scientific aims
- C.
Integrated aims
- D.
Eugenic aims
Correct Answer
D. Eugenic aimsExplanation
The given correct answer is "Eugenic aims". Cloning is a technology that can be used for eugenic purposes, which involve improving the genetic quality of a population by selecting or manipulating certain traits. This can be done through cloning to produce individuals with desired characteristics or to eliminate genetic diseases. Eugenic aims focus on enhancing the genetic makeup of a population, and cloning can be a tool to achieve this goal.Rate this question:
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- 2.
Deductive reasoning is always from
- A.
Specific to general
- B.
Tentative to exact
- C.
General to specific
- D.
Qualitative to quantitative
Correct Answer
C. General to specificExplanation
Deductive reasoning is a logical process in which conclusions are drawn from general principles or premises to specific instances or conclusions. It starts with a broad or general statement and then applies it to a specific case or situation. By using deductive reasoning, one can make specific predictions or conclusions based on the general principles or premises that are known to be true. Therefore, the correct answer is "General to specific".Rate this question:
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- 3.
The branch of Biology dealing with social behavior and communal life of human beings is
- A.
Human Biology
- B.
Social Biology
- C.
Micro Biology
- D.
Bio technology
Correct Answer
B. Social BiologyExplanation
Social Biology is the correct answer because it is the branch of Biology that specifically focuses on the social behavior and communal life of human beings. It studies how individuals interact with each other, form relationships, and function within social groups. This field examines various aspects of human social behavior, including communication, cooperation, competition, and the influence of culture and society on individuals. By studying social biology, researchers gain insights into the complexities of human social interactions and how they shape our lives.Rate this question:
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- 4.
The study of microorganisms is called
- A.
Parasitology
- B.
Microbiology
- C.
Social Biology
- D.
Molecular Biology
Correct Answer
B. MicrobiologyExplanation
Microbiology is the correct answer because it is the branch of biology that deals with the study of microorganisms, including bacteria, viruses, fungi, and protozoa. It involves the study of their structure, function, classification, and their interaction with the environment and other organisms. Microbiology is important in various fields such as medicine, agriculture, industry, and environmental science, as it helps in understanding and controlling diseases, developing vaccines and antibiotics, improving food production, and studying the impact of microorganisms on ecosystems.Rate this question:
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- 5.
In integrated disease management involves
- A.
Combating of disease
- B.
Loss of microbes
- C.
Extinction of species
- D.
Division of zygote
Correct Answer
A. Combating of diseaseExplanation
Integrated disease management involves the comprehensive approach of combating diseases. It encompasses various strategies such as prevention, control, and treatment of diseases. This approach combines multiple methods, including the use of resistant crop varieties, cultural practices, biological control agents, and chemical interventions, to effectively manage and reduce the impact of diseases on crops, animals, and humans. By adopting integrated disease management, the aim is to minimize the spread and severity of diseases, ultimately leading to healthier and more resilient ecosystems.Rate this question:
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- 6.
Which one of the following is a correct sequence in biological methods
- A.
Observation-hypothesis-law-theory
- B.
Observation-hypothesis-deduction-testing of deduction
- C.
Hypothesis-observation-deduction-testing of deduction
- D.
Law-theory-observation-deduction
Correct Answer
B. Observation-hypothesis-deduction-testing of deductionExplanation
The correct sequence in biological methods is observation, hypothesis, deduction, and testing of deduction. This sequence follows the scientific method, where observations are made, hypotheses are formulated based on these observations, deductions are made from the hypotheses, and then these deductions are tested through experiments or further observations. This systematic approach allows scientists to gather evidence and make informed conclusions about biological phenomena.Rate this question:
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- 7.
A structure within a cell that perform specific function is called
- A.
Molecule
- B.
Atom
- C.
Organelle
- D.
Element
Correct Answer
C. OrganelleExplanation
An organelle is a structure within a cell that performs specific functions. It is a specialized compartment with its own specific role, such as the nucleus, mitochondria, or chloroplasts. Unlike molecules, atoms, or elements, organelles are larger and more complex structures that are essential for the proper functioning of a cell. They have specific functions and work together to carry out various processes necessary for the survival and functioning of the cell.Rate this question:
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- 8.
All the living and non-living matter is formed of
- A.
Organic molecules and tissues
- B.
Atoms and sub-atomic particles
- C.
Cells and cell products
- D.
Organs and organelle
Correct Answer
B. Atoms and sub-atomic particlesExplanation
All matter, whether living or non-living, is made up of atoms and sub-atomic particles. Atoms are the basic building blocks of matter and are composed of sub-atomic particles such as protons, neutrons, and electrons. These particles combine to form various elements and molecules, which in turn make up all living and non-living things in the universe. Therefore, atoms and sub-atomic particles are the fundamental components of all matter.Rate this question:
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- 9.
Which of the following is not related to cloning
- A.
Replacement of the nucleus of zygote, by another nucleus of same organism
- B.
Separation of cells of embryo to form more embroys
- C.
The individuals resulting have similar genetic make up
- D.
Removal of piece of DNA or gene from the cell, and incorporating other gene or piece of DNA in it place
Correct Answer
D. Removal of piece of DNA or gene from the cell, and incorporating other gene or piece of DNA in it placeExplanation
The given answer, "Removal of piece of DNA or gene from the cell, and incorporating other gene or piece of DNA in its place," is not related to cloning. Cloning involves the reproduction of an organism with identical genetic material, while the given answer describes genetic engineering or gene manipulation, which is a different process. Cloning typically involves techniques such as replacing the nucleus of a zygote or separating cells of an embryo to form more embryos, resulting in individuals with similar genetic makeup.Rate this question:
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- 10.
AIDS is caused by
- A.
H-virus
- B.
TMV
- C.
HIV
- D.
D- virus
Correct Answer
C. HIVExplanation
AIDS is caused by the Human Immunodeficiency Virus (HIV). HIV attacks the immune system, specifically CD4 cells, which are crucial in fighting off infections and diseases. Over time, HIV destroys enough of these cells, weakening the immune system and making the individual susceptible to various infections and illnesses.Rate this question:
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- 11.
An ellipse slides between two lines at right angles to one another. The locus of its centre is
- A.
A parabola
- B.
An elipse
- C.
A circle
- D.
A hyperbola
Correct Answer
C. A circleExplanation
When an ellipse slides between two lines at right angles to one another, the locus of its center is a circle. This is because the center of the ellipse always remains equidistant from the two lines as it slides, creating a constant radius. Therefore, the locus of the center forms a circle.Rate this question:
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- 12.
Which of the following molecule have double covalent bond:
- A.
N2
- B.
O2
- C.
H2
- D.
Ch4
Correct Answer
B. O2Explanation
O2 is the correct answer because it is the only molecule among the given options that contains a double covalent bond. A double covalent bond is formed when two pairs of electrons are shared between two atoms. In the case of O2, the two oxygen atoms are connected by a double bond, where they share two pairs of electrons.Rate this question:
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- 13.
Computer chips are made of
- A.
Germanium
- B.
Aluminium
- C.
Silicon
- D.
Sodium
Correct Answer
C. SiliconExplanation
Computer chips are made of silicon. Silicon is a widely used semiconductor material due to its ability to conduct electricity and its abundance in the Earth's crust. It is the primary material used in the manufacturing of computer chips because of its excellent electrical properties and its compatibility with the processes involved in chip fabrication. Silicon's ability to control and amplify electrical signals makes it ideal for building transistors, which are the building blocks of computer chips. Additionally, silicon's thermal properties allow for efficient heat dissipation, ensuring the longevity and reliability of computer chips.Rate this question:
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- 14.
As compared to pure atomic orbitals the orbitals have:
- A.
High energy
- B.
Low energy
- C.
Same energy
- D.
Variable energy
Correct Answer
B. Low energyExplanation
The statement suggests that the orbitals have low energy compared to pure atomic orbitals. This implies that the electrons in these orbitals are more stable and closer to the nucleus, resulting in lower energy levels. This could be due to the formation of molecular orbitals through the combination of atomic orbitals. In molecular orbitals, the electrons are shared between two or more atoms, leading to a decrease in energy.Rate this question:
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- 15.
A basic buffer solution can be prepared by mixing:
- A.
Strong acid and its salt with weak base
- B.
Weak base and its salt with strong acid
- C.
Strong base and its salt with weak acid
- D.
Weak acid and its salt with strong base
Correct Answer
B. Weak base and its salt with strong acidExplanation
A basic buffer solution can be prepared by mixing a weak base and its salt with a strong acid. This is because a weak base can partially react with the strong acid, forming the salt and water. The salt then acts as a reservoir of the conjugate base of the weak base, which can react with any additional acid that is added to the solution, preventing a significant change in the pH. Therefore, this combination is able to resist changes in pH and maintain the solution's basic nature.Rate this question:
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- 16.
If nP2 = 30 , the value of n is
- A.
6
- B.
8
- C.
10
- D.
12
Correct Answer
A. 6Explanation
If nP2 = 30, it means that the number of permutations of n objects taken 2 at a time is equal to 30. Since the answer is 6, it implies that there are 6 objects in total.Rate this question:
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- 17.
Heat of vaporization for liquids with strong dipole dipole forces will have:
- A.
Negligible values.
- B.
Reasonably high values.
- C.
Very high values.
- D.
Very low values.
Correct Answer
B. Reasonably high values.Explanation
Liquids with strong dipole-dipole forces have molecules that are strongly attracted to each other. When these liquids vaporize, a significant amount of energy is required to break these intermolecular forces and convert the liquid into a gas. Therefore, the heat of vaporization for liquids with strong dipole-dipole forces will have reasonably high values.Rate this question:
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- 18.
Geometrical optics was introduced by
- A.
Newton
- B.
Plato
- C.
Plato
- D.
Maxwell
Correct Answer
C. Plato -
- 19.
By using scientific notation 9000 can be written as
- A.
9 x 102
- B.
9 x 103
- C.
9 x 104
- D.
9 x 10-4
Correct Answer
B. 9 x 103Explanation
The scientific notation allows us to express large numbers in a more compact form. In this case, the number 9000 can be written as 9 multiplied by 10 raised to the power of 3. This means that we move the decimal point three places to the right, resulting in a value of 9000. Therefore, the correct answer is 9 x 10^3.Rate this question:
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- 20.
X-rays are attached towards:
- A.
Cathode
- B.
Any Electrode
- C.
Anode
- D.
None of electrode
Correct Answer
D. None of electrodeExplanation
X-rays are not attached to any specific electrode. X-rays are generated when high-energy electrons collide with a target material, typically a metal such as tungsten, in a device called an X-ray tube. The high-energy electrons are produced at the cathode and accelerated towards the anode. When the electrons hit the target material, X-rays are emitted. Therefore, X-rays are not attached to any electrode but are produced as a result of the interaction between the high-energy electrons and the target material.Rate this question:
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- 21.
In stoichiometric calculations
- A.
The reaction can be reversile
- B.
Side products can be formed
- C.
Law of conservation of mass may not be obeyed
- D.
Law of definite proportions is definitely obeyed
Correct Answer
D. Law of definite proportions is definitely obeyedExplanation
The law of definite proportions states that a chemical compound always contains the same elements in the same proportions by mass. This means that regardless of the reaction being reversible or side products being formed, the ratio of elements in a compound will remain constant. Stoichiometric calculations involve determining the quantities of reactants and products in a chemical reaction based on the balanced equation. Since stoichiometry is based on the law of definite proportions, it ensures that the calculations are accurate and consistent with the composition of the compounds involved.Rate this question:
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- 22.
Calcium has isotopes
- A.
7
- B.
1
- C.
8
- D.
6
Correct Answer
D. 6Explanation
Calcium (20Ca) has 27 isotopes, from 34Ca to 60Ca. There are five stable isotopes (40Ca, 42Ca, 43Ca, 44Ca and 46Ca), plus one isotope (48Ca) with such a long half-life that for all practical purposes it can be considered stable.Rate this question:
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- 23.
The mass of one mole of electrons is
- A.
1.008 mg
- B.
0.55 mg
- C.
0.184 mg
- D.
1.673 mg
Correct Answer
B. 0.55 mgExplanation
The mass of one mole of electrons is 0.55 mg. This is because the molar mass of electrons is approximately 5.4858 x 10^-4 g/mol, which is equivalent to 0.55 mg/mol. The molar mass is calculated by taking the atomic mass of an element and expressing it in grams per mole. In this case, since electrons are subatomic particles and not elements, their molar mass is very small compared to other substances.Rate this question:
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- 24.
The number of moles of CO2which contain 8.0 g of oxygen
- A.
0.25
- B.
0.50
- C.
1.0
- D.
1.50
Correct Answer
A. 0.25Explanation
The molar mass of CO2 is 44 g/mol. Since there are 2 oxygen atoms in CO2, the molar mass of oxygen is 32 g/mol. Therefore, 8.0 g of oxygen is equal to 0.25 moles (8.0 g / 32 g/mol = 0.25 mol).Rate this question:
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- 25.
The volume occupied by 1.4 g on N2at S.T.P is
- A.
2.24 dm3
- B.
22.4 dm3
- C.
112 cm3
- D.
1.12 dm3
Correct Answer
D. 1.12 dm3Explanation
"To find the moles of nitrogen, it is necessary to use the idea of molar volume
Mass of N2 = 1.4 g
Moles of N2 = 1.4g / 28g per mole = 0.05 moles
One mole of N2 at S.T.P has volume = 22.414 dm3
0.05 moles of N2 at S.T.P has volume = 22.414 × 0.05 = 1.12 dm3 AnswerRate this question:
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- 26.
I molar volume of a gas at S.T.P is occupied by
- A.
1 g of gas
- B.
6 x 1023g of gas
- C.
22.4 m3of gas
- D.
1 gram molecular mass of gas
Correct Answer
D. 1 gram molecular mass of gasExplanation
The molar volume of a gas at STP (Standard Temperature and Pressure) is the volume occupied by one mole of gas. This means that if we have one mole of gas, it will occupy a volume of 22.4 m^3. The answer "1 gram molecular mass of gas" is correct because a mole of any substance contains Avogadro's number of particles, which is approximately 6 x 10^23. Therefore, if we have one mole of gas, it will contain 6 x 10^23 particles, regardless of their mass.Rate this question:
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- 27.
The volume occupied by 1.6 g of O2at STP is
- A.
22.4 dm3
- B.
2.24 dm3
- C.
1.12 dm3
- D.
112 dm3
Correct Answer
C. 1.12 dm3Explanation
At STP (standard temperature and pressure), the volume occupied by 1 mole of any gas is 22.4 dm3. The molar mass of O2 is 32 g/mol, so 1.6 g of O2 is equal to 0.05 moles. Therefore, the volume occupied by 1.6 g of O2 at STP is 0.05 moles multiplied by 22.4 dm3/mole, which equals 1.12 dm3.Rate this question:
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- 28.
Which of the following compound has the highest % o f oxygen by weight
- A.
CH3- OH
- B.
C2H5OH
- C.
HCOOH
- D.
H2O
Correct Answer
D. H2OExplanation
H2O, also known as water, has the highest percentage of oxygen by weight compared to the other compounds listed. This is because water consists of two hydrogen atoms and one oxygen atom, making up approximately 88.89% of its total weight. In contrast, CH3-OH (methanol) has one oxygen atom, making up approximately 14.28% of its total weight. C2H5OH (ethanol) has one oxygen atom as well, making up approximately 13.64% of its total weight. HCOOH (formic acid) has one oxygen atom, making up approximately 16.67% of its total weight. Therefore, H2O has the highest percentage of oxygen by weight.Rate this question:
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- 29.
Isotopes are the atoms of same element with similar chemical properties but different
- A.
Atomic number
- B.
Atomic volume
- C.
Atomic weight
- D.
Atomic structure
Correct Answer
C. Atomic weightExplanation
Isotopes are atoms of the same element that have the same number of protons (atomic number) but different numbers of neutrons, resulting in different atomic weights. Atomic weight is the average mass of all the isotopes of an element, taking into account their abundance in nature. Therefore, isotopes have similar chemical properties because they have the same number of electrons and protons, but their atomic weights differ due to the varying number of neutrons.Rate this question:
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- 30.
A limiting reactant is that one which
- A.
Gives greatest number of moles of products
- B.
Gives least number of moles of products
- C.
Is left behind after the completion of reaction
- D.
NOT
Correct Answer
B. Gives least number of moles of productsExplanation
The limiting reactant is the one that gives the least number of moles of products. This means that in a chemical reaction, there may be an excess of one reactant while the other reactant is completely consumed. The reactant that is completely consumed is the limiting reactant because it determines the maximum amount of product that can be formed. The reactant in excess is not fully utilized and remains after the reaction is completed.Rate this question:
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