Major Competitive Exams
Q. Which of the following is a consequence of eutrophication?
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A.
Increased biodiversity
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B.
Decreased oxygen levels
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C.
Improved water clarity
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D.
Reduction of algal blooms
Solution
Eutrophication leads to decreased oxygen levels in water bodies, which can harm aquatic life.
Correct Answer: B — Decreased oxygen levels
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Q. Which of the following is a consequence of global warming?
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A.
Rising sea levels
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B.
Increased ice cover
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C.
Decreased temperatures
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D.
None of the above
Solution
Global warming leads to rising sea levels due to the melting of polar ice and glaciers.
Correct Answer: A — Rising sea levels
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Q. Which of the following is a consequence of Lenz's law?
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A.
Induced current opposes the change in magnetic flux
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B.
Induced current enhances the change in magnetic flux
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C.
Induced current is always zero
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D.
Induced current is independent of magnetic field
Solution
Lenz's law states that the direction of induced current is such that it opposes the change in magnetic flux.
Correct Answer: A — Induced current opposes the change in magnetic flux
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Q. Which of the following is a consequence of Newton's law of gravitation?
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A.
The orbits of planets are elliptical
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B.
Masses repel each other
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C.
Gravitational force is a vector quantity
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D.
All objects fall at the same rate in a vacuum
Solution
Newton's law of gravitation leads to the conclusion that the orbits of planets are elliptical, as described by Kepler's laws.
Correct Answer: A — The orbits of planets are elliptical
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Q. Which of the following is a consequence of Raoult's Law in a binary solution?
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A.
The total vapor pressure is the sum of the partial pressures.
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B.
The total vapor pressure is always lower than the vapor pressure of the pure solvent.
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C.
The mole fraction of the solute is always greater than that of the solvent.
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D.
The boiling point of the solution is always higher than that of the pure solvent.
Solution
According to Raoult's Law, the total vapor pressure of a binary solution is the sum of the partial pressures of each component.
Correct Answer: A — The total vapor pressure is the sum of the partial pressures.
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Q. Which of the following is a consequence of the law of universal gravitation?
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A.
The orbits of planets are elliptical
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B.
All objects fall at the same rate in a vacuum
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C.
Gravity is a contact force
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D.
Mass does not affect gravitational attraction
Solution
The law of universal gravitation leads to the conclusion that the orbits of planets are elliptical, as described by Kepler's laws.
Correct Answer: A — The orbits of planets are elliptical
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Q. Which of the following is a correct application of Ampere's Law?
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A.
Calculating electric field in a capacitor
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B.
Finding the magnetic field in a toroid
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C.
Determining the potential difference across a resistor
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D.
Calculating the energy stored in an inductor
Solution
Ampere's Law is used to find the magnetic field in a toroid, where the symmetry allows for straightforward application of the law.
Correct Answer: B — Finding the magnetic field in a toroid
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Q. Which of the following is a correct application of Raoult's Law?
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A.
Calculating the boiling point elevation
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B.
Determining the freezing point depression
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C.
Finding the vapor pressure of a solution
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D.
Measuring the solubility of a gas in a liquid
Solution
Raoult's Law is used to find the vapor pressure of a solution based on the vapor pressures of its components.
Correct Answer: C — Finding the vapor pressure of a solution
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Q. Which of the following is a correct expression for Gibbs Free Energy?
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A.
ΔG = ΔH + TΔS
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B.
ΔG = ΔH - TΔS
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C.
ΔG = TΔS - ΔH
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D.
ΔG = ΔS - ΔH
Solution
The correct expression for Gibbs Free Energy is ΔG = ΔH - TΔS.
Correct Answer: B — ΔG = ΔH - TΔS
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Q. Which of the following is a correct representation of significant figures?
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A.
0.00450
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B.
4500
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C.
0.0450
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D.
4500.0
Solution
0.00450 has 3 significant figures due to the trailing zero after the 5.
Correct Answer: A — 0.00450
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Q. Which of the following is a correct statement about the law of conservation of mass?
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A.
Mass can be created
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B.
Mass can be destroyed
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C.
Mass is conserved in a chemical reaction
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D.
Mass changes in a physical change
Solution
The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.
Correct Answer: C — Mass is conserved in a chemical reaction
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Q. Which of the following is a correct unit for concentration?
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A.
Molarity
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B.
Molality
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C.
Mass percent
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D.
All of the above
Solution
All listed options are valid units for concentration.
Correct Answer: D — All of the above
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Q. Which of the following is a correct unit for Gibbs Free Energy?
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A.
Joules per mole (J/mol)
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B.
Kilojoules (kJ)
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C.
Calories (cal)
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D.
All of the above
Solution
Gibbs Free Energy can be expressed in various units, including Joules per mole, kilojoules, and calories.
Correct Answer: D — All of the above
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Q. Which of the following is a correct unit for molality?
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A.
mol/L
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B.
mol/kg
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C.
mol/mL
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D.
mol/1000g
Solution
Molality is defined as moles of solute per kilogram of solvent, hence the unit is mol/kg.
Correct Answer: B — mol/kg
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Q. Which of the following is a derivative of benzene?
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A.
Ethylene
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B.
Acetylene
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C.
Phenol
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D.
Propylene
Solution
Phenol is a derivative of benzene, where one hydrogen atom is replaced by a hydroxyl group (-OH).
Correct Answer: C — Phenol
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Q. Which of the following is a derivative of carboxylic acid?
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A.
Alcohol
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B.
Aldehyde
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C.
Ester
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D.
Alkane
Solution
Ester is a derivative of carboxylic acid formed by the reaction of an acid with an alcohol.
Correct Answer: C — Ester
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Q. Which of the following is a derived unit?
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A.
Meter
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B.
Kilogram
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C.
Second
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D.
Newton
Solution
Newton is a derived unit as it is defined in terms of the base units: 1 N = 1 kg·m/s².
Correct Answer: D — Newton
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Q. Which of the following is a dicarboxylic acid?
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A.
Acetic acid
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B.
Oxalic acid
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C.
Formic acid
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D.
Butanoic acid
Solution
Oxalic acid (C2H2O4) is a dicarboxylic acid as it contains two carboxylic acid groups.
Correct Answer: B — Oxalic acid
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Q. Which of the following is a disaccharide?
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A.
Fructose
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B.
Maltose
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C.
Glucose
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D.
Glycogen
Solution
Maltose is a disaccharide composed of two glucose units.
Correct Answer: B — Maltose
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Q. Which of the following is a disadvantage of frequency modulation (FM) compared to amplitude modulation (AM)?
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A.
Higher bandwidth requirement
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B.
More susceptible to noise
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C.
Lower fidelity
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D.
Easier to demodulate
Solution
FM requires a larger bandwidth than AM, which can be a disadvantage in certain communication systems.
Correct Answer: A — Higher bandwidth requirement
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Q. Which of the following is a disadvantage of Frequency Modulation (FM)?
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A.
Less bandwidth
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B.
More noise immunity
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C.
Complex receiver design
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D.
Simple implementation
Solution
FM requires a more complex receiver design compared to AM.
Correct Answer: C — Complex receiver design
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Q. Which of the following is a family of exponential curves?
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A.
y = e^x
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B.
y = x^2
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C.
y = log(x)
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D.
y = sin(x)
Solution
The equation y = e^x represents a family of exponential curves for different bases.
Correct Answer: A — y = e^x
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Q. Which of the following is a function of carbohydrates?
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A.
Energy source
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B.
Hormone production
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C.
Genetic coding
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D.
Cell membrane structure
Solution
Carbohydrates primarily serve as an energy source for living organisms.
Correct Answer: A — Energy source
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Q. Which of the following is a function of lipids?
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A.
Energy storage
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B.
Catalysis
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C.
Genetic information
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D.
Structural support
Solution
Lipids are primarily used for energy storage in organisms.
Correct Answer: A — Energy storage
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Q. Which of the following is a function of proteins in the body?
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A.
Energy storage
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B.
Hormonal regulation
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C.
Transport of molecules
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D.
All of the above
Solution
Proteins serve multiple functions in the body, including energy storage, hormonal regulation, and transport of molecules.
Correct Answer: D — All of the above
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Q. Which of the following is a function of proteins?
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A.
Energy storage
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B.
Hormonal regulation
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C.
Genetic information
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D.
Cell membrane structure
Solution
Proteins play a crucial role in hormonal regulation among other functions.
Correct Answer: B — Hormonal regulation
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Q. Which of the following is a good conductor of heat?
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A.
Wood
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B.
Plastic
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C.
Copper
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D.
Glass
Solution
Copper is a good conductor of heat.
Correct Answer: C — Copper
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Q. Which of the following is a heavy metal that can cause environmental pollution?
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A.
Iron
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B.
Lead
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C.
Calcium
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D.
Sodium
Solution
Lead is a heavy metal that can accumulate in the environment and is toxic to living organisms.
Correct Answer: B — Lead
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Q. Which of the following is a heavy metal that poses environmental hazards?
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A.
Sodium
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B.
Calcium
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C.
Lead
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D.
Potassium
Solution
Lead is a heavy metal that poses significant environmental and health hazards.
Correct Answer: C — Lead
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Q. Which of the following is a hydrogen compound that acts as a reducing agent?
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A.
H2O
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B.
H2S
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C.
HCl
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D.
H2O2
Solution
Hydrogen sulfide (H2S) acts as a reducing agent.
Correct Answer: B — H2S
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