All Free Biology MCQs with Answers

4171. Find the error:One of them, however, said: "She was a very old woman, who must have died shortly in none case."

• A. However
• B. Very
• C. Have
• D. None

Explanation: The phrase "in none case" is wrong; it should be "in any case."The pronoun around this phrase is incorrect, making 'none' the error.

4172. Select the most suitable synonym for the given word:CRUDELY

• A. Roughly
• B. Sporadically
• C. Accurately
• D. Regularly

Explanation: Crude is another word to describe rude, offensive behaviour, similar to rough.

4173. In the following question, three statements are given followed by four Conclusions. You have to consider the statements to be true even if they seems to be at variance from commonly known facts. You have to decide which of the given Conclusions can definitely be drawn from the given statements. Indicate your answer.Statements:a). In a consignment, all the boxes contain books.b). Some of these boxes have also note-books.c). Some other boxes have also scribbling pads.Conclusions: In this consignment,I. Some boxes contain only scribbling pads.II. All boxes contain notebooks.III. Some boxes contain notebook and books.IV. Some boxes contain notebooks, scribbling pads, and books.

• A. Only Conclusion III follows
• B. Only Conclusion II follows
• C. Only Conclusion I follows
• D. Only Conclusion IV follows
• E. All the conclusions follow

Explanation: To solve this question, analyze each statement and conclusion carefully:Statements:All boxes contain books.Some boxes contain notebooks.Some boxes contain scribbling pads.Conclusion Analysis:Conclusion I is incorrect because every box contains books, so no box can contain only scribbling pads.Conclusion II is incorrect as not all boxes contain notebooks, only some do.Conclusion III is correct as it directly aligns with statement (b) mentioning some boxes having both notebooks and books.Conclusion IV is incorrect as there is no indication that any box contains all three items: books, notebooks, and scribbling pads.Therefore, only Conclusion III can be definitively drawn from the statements provided, making Option A the correct choice.

4174. If '-' means '+', '+' means '-', '*' means '÷' and '÷' means '*' then which of the following will be the correct equation?

• A. 10 + 5 - 14 ÷ 10 * 15 = 158
• B. 30 + 5 + 14 - 10 * 15 = 122
• C. 30 - 5 + 14 ÷ 10 * 15 = 162
• D. 30 * 5 - 4 ÷ 10 + 15 = 31
• E. None of these

Explanation: Your equation is:10 + 5 - 14 ÷ 10 * 15 = 158First, replace the symbols:+ → -- → +÷ → ** → ÷Thus, the equation becomes:10 - 5 + 14 * 10 ÷ 15Now, solve step-by-step following BODMAS:Multiplication and Division first:14 * 10 = 140140 ÷ 15 ≈ 9.333...Now the equation becomes:10 - 5 + 9.333...Left to right (Addition/Subtraction):10 - 5 = 55 + 9.333... = 14.333...Thus:Final result: 14.333..

4175. Pick the odd word out:

• A. Just
• B. Fair
• C. Equitable
• D. Biased

Explanation: The words "just," "fair," and "equitable" are all synonyms related to impartiality and justice. "Biased" is an antonym, meaning to show prejudice for or against something, making it the odd one out.

4176. Statement: A large number of people in ward X of the city are diagnosed to be suffering from a fatal malaria type.Courses of Action:I. The city municipal authority should take immediate steps to carry out extensive fumigation in ward X.II. The people in the area should be advised to take steps to avoid mosquito bites.

• A. If only I is most appropriate
• B. If only II is most appropriate
• C. If either I or II is most appropriate
• D. If both I and II are most appropriate

Explanation: A public health crisis requires a comprehensive response. Fumigation (I) tackles the vector population, while personal protection (II) reduces immediate transmission risk. Both are essential and appropriate actions.

4177. Statements: I. Majority of people residing in the locality have decided to protest against the municipal authority's decision to allow the construction of a shopping mall in the locality. II. Many shopping malls have been opened all over the city in the recent times.

• A. Statement I is the cause and statement II is its effect
• B. Statement II is the cause and statement I is its effect
• C. Both the statements I and II are independent causes
• D. Both the statements I and II are effects of independent causes

Explanation: The recent proliferation of shopping malls (Statement II) could be the cause of "mall fatigue" or concerns about overdevelopment, leading the residents to protest the construction of yet another one in their locality (Statement I).

4178. The property of water molecule which results in hydrogen bonding is

• A. Polarity
• B. Cohesion
• C. Heat of vaporization
• D. Specific heat capacity

Explanation: The correct answer is polarity. Water molecules have a polar structure, meaning there is an uneven distribution of electron density. The oxygen atom has a partial negative charge, while the hydrogen atoms have partial positive charges. This polarity allows water molecules to form hydrogen bonds with each other, as the positively charged hydrogen atoms of one molecule are attracted to the negatively charged oxygen atoms of another. The other options describe properties or phenomena that result from hydrogen bonding but do not explain why hydrogen bonds form in the first place.

4179. Due to its high heat of vaporization water plays important role in living organism as:

• A. Being an excellent solvent
• B. Cooling agent
• C. Membrane stabilizer
• D. Thermal shock resistor

Explanation: Due to its high heat capacity, water is used by warm blooded animals to more evenly disperse heat in their bodies; it acts in a similar manner to a car's cooling system, transporting heat from warm places to cool places, causing the body to maintain a more even temperature.

4180. The specific heat capacity of water is the number of calories required to raise the temperature of water from _ ˚C is 1.0.

• A. 15 to 16
• B. 16 to 18
• C. 15 to 20
• D. 25 to 29

Explanation: The specific heat capacity is defined as the quantity of heat (J) absorbed per unit mass (kg) of the material when its temperature increases 1 K (or 1 °C)Specific heat capacity is the amount of heat to be supplied to (or taken out of) the unit mass of a system in order to increase (or decrease) its temperature by one degree in a thermodynamic process in which quantity X is imposed, according to: [1.25] δ Q = C X d T