Medical Entrance
Q. The magnetic field inside a long solenoid is given by which of the following expressions? (2020)
A.
μ₀nI
B.
μ₀I/n
C.
nI/μ₀
D.
I/μ₀n
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Solution
The magnetic field (B) inside a long solenoid is given by B = μ₀nI, where n is the number of turns per unit length and I is the current.
Correct Answer: A — μ₀nI
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Q. The magnetic field lines around a straight current-carrying conductor are: (2022)
A.
Straight lines
B.
Concentric circles
C.
Elliptical
D.
Random
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Solution
The magnetic field lines around a straight current-carrying conductor form concentric circles centered around the wire.
Correct Answer: B — Concentric circles
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Q. The magnetic field lines inside a bar magnet are directed from: (2019)
A.
North to South
B.
South to North
C.
East to West
D.
West to East
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Solution
The magnetic field lines inside a bar magnet are directed from the North pole to the South pole.
Correct Answer: A — North to South
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Q. The potential energy stored in a capacitor is given by which of the following formulas? (2020)
A.
1/2 CV^2
B.
CV
C.
Q^2/2C
D.
1/2 QV
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Solution
The potential energy (U) stored in a capacitor is given by U = 1/2 CV^2.
Correct Answer: A — 1/2 CV^2
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Q. The pressure of a gas is inversely proportional to its volume at constant temperature is known as: (2022)
A.
Charles's Law
B.
Boyle's Law
C.
Avogadro's Law
D.
Ideal Gas Law
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Solution
Boyle's Law states that the pressure of a gas is inversely proportional to its volume at constant temperature.
Correct Answer: B — Boyle's Law
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Q. The pressure of an ideal gas is directly proportional to its temperature when: (2022)
A.
Volume is constant
B.
Number of moles is constant
C.
Both volume and number of moles are constant
D.
None of the above
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Solution
According to Gay-Lussac's law, the pressure of an ideal gas is directly proportional to its temperature when the volume is held constant.
Correct Answer: A — Volume is constant
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Q. The rate of a reaction is directly proportional to the product of the concentrations of the reactants raised to their respective powers. This statement defines:
A.
Rate law
B.
Equilibrium constant
C.
Reaction quotient
D.
Catalytic efficiency
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Solution
This statement defines the rate law of a reaction.
Correct Answer: A — Rate law
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Q. The restoring force in a simple harmonic oscillator is directly proportional to what? (2022)
A.
Displacement
B.
Velocity
C.
Acceleration
D.
Mass
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Solution
The restoring force (F) is directly proportional to the displacement (x) and acts in the opposite direction, F = -kx.
Correct Answer: A — Displacement
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Q. The restoring force in simple harmonic motion is directly proportional to what? (2022)
A.
Displacement
B.
Velocity
C.
Acceleration
D.
Mass
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Solution
The restoring force (F) is directly proportional to the displacement (x) and acts in the opposite direction, F = -kx.
Correct Answer: A — Displacement
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Q. The scientific study of classification is known as: (2022)
A.
Taxonomy
B.
Morphology
C.
Anatomy
D.
Ecology
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Solution
Taxonomy is the scientific study of classification of organisms.
Correct Answer: A — Taxonomy
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Q. The specific heat capacity of a substance is defined as: (2023)
A.
The amount of heat required to raise the temperature by 1 degree Celsius
B.
The amount of heat required to change the phase of a substance
C.
The heat required to raise the temperature of 1 kg of the substance by 1 degree Celsius
D.
The heat required to raise the temperature of 1 mole of the substance by 1 degree Celsius
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Solution
The specific heat capacity is defined as the amount of heat required to raise the temperature of 1 kg of the substance by 1 degree Celsius.
Correct Answer: C — The heat required to raise the temperature of 1 kg of the substance by 1 degree Celsius
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Q. The term 'adsorption' refers to: (2022)
A.
The process of a substance being taken up by a liquid.
B.
The accumulation of molecules on a surface.
C.
The mixing of two liquids.
D.
The dissolution of a solid in a liquid.
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Solution
Adsorption is the process where molecules accumulate on the surface of a solid or liquid.
Correct Answer: B — The accumulation of molecules on a surface.
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Q. The uncertainty in a measurement is defined as: (2022)
A.
The difference between the maximum and minimum values
B.
The average of the measurements
C.
The standard deviation
D.
The range of values
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Solution
Uncertainty is often defined as the range of values within which the true value lies.
Correct Answer: A — The difference between the maximum and minimum values
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Q. The unit cell of a diamond structure is best described as which of the following? (2020)
A.
Simple cubic
B.
Face-centered cubic
C.
Body-centered cubic
D.
Hexagonal
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Solution
The diamond structure can be described as a face-centered cubic (FCC) lattice with a basis of two carbon atoms.
Correct Answer: B — Face-centered cubic
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Q. The unit of force in the SI system is derived from which of the following? (2023)
A.
Mass and length
B.
Mass, length, and time
C.
Length and time
D.
Mass and time
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Solution
The unit of force (Newton) is derived from mass, length, and time: kg·m/s².
Correct Answer: B — Mass, length, and time
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Q. The unit of force in the SI system is: (2023)
A.
Joule
B.
Newton
C.
Pascal
D.
Watt
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Solution
The SI unit of force is the Newton (N).
Correct Answer: B — Newton
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Q. The unit of power in the SI system is: (2023)
A.
Joule
B.
Watt
C.
Newton
D.
Pascal
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Solution
The SI unit of power is the Watt (W).
Correct Answer: B — Watt
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Q. The unit of work is defined as one joule. What is one joule equivalent to? (2023)
A.
One newton meter
B.
One kilogram meter per second
C.
One watt second
D.
One pascal meter
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Solution
One joule is defined as one newton meter (N·m).
Correct Answer: A — One newton meter
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Q. The viscosity of a fluid is a measure of its: (2022)
A.
Density
B.
Pressure
C.
Resistance to flow
D.
Temperature
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Solution
Viscosity measures a fluid's resistance to flow; higher viscosity means the fluid flows less easily.
Correct Answer: C — Resistance to flow
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Q. Two capacitors of capacitance 2μF and 3μF are connected in series. What is the equivalent capacitance? (2019)
A.
1.2μF
B.
1.5μF
C.
0.86μF
D.
5μF
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Solution
For capacitors in series, 1/C_eq = 1/C1 + 1/C2. Thus, 1/C_eq = 1/2 + 1/3 = 5/6, giving C_eq = 6/5 = 1.2μF.
Correct Answer: C — 0.86μF
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Q. Viruses are classified as: (2020)
A.
Living organisms
B.
Non-living entities
C.
Prokaryotes
D.
Eukaryotes
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Solution
Viruses are considered non-living entities as they cannot carry out metabolic processes independently.
Correct Answer: B — Non-living entities
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Q. What does the term 'enthalpy' (H) represent? (2019)
A.
Internal energy plus pressure-volume work
B.
Total energy of the system
C.
Heat content at constant pressure
D.
All of the above
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Solution
Enthalpy (H) represents the total heat content of a system at constant pressure and is defined as internal energy plus pressure-volume work.
Correct Answer: D — All of the above
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Q. What enzyme is responsible for the digestion of carbohydrates in the mouth? (2020)
A.
Pepsin
B.
Amylase
C.
Lipase
D.
Trypsin
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Solution
Salivary amylase is the enzyme that begins the digestion of carbohydrates in the mouth.
Correct Answer: B — Amylase
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Q. What happens to the capacitance of a capacitor if a dielectric material is inserted between its plates? (2022)
A.
It decreases
B.
It increases
C.
It remains the same
D.
It becomes zero
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Solution
Inserting a dielectric material increases the capacitance of the capacitor by a factor equal to the dielectric constant of the material.
Correct Answer: B — It increases
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Q. What happens to the capacitance of a capacitor if a dielectric material is introduced between its plates? (2021)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
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Solution
The capacitance increases when a dielectric material is introduced, as it reduces the electric field between the plates.
Correct Answer: A — Increases
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Q. What happens to the current in a circuit if the voltage is increased while keeping the resistance constant? (2023)
A.
It decreases
B.
It increases
C.
It remains the same
D.
It becomes zero
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Solution
According to Ohm's Law, if the voltage increases while resistance remains constant, the current will also increase.
Correct Answer: B — It increases
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Q. What happens to the current in a circuit if the voltage is increased while the resistance remains constant? (2021)
A.
The current decreases
B.
The current increases
C.
The current remains the same
D.
The current becomes zero
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Solution
According to Ohm's Law, if the voltage (V) increases while resistance (R) remains constant, the current (I) will increase.
Correct Answer: B — The current increases
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Q. What happens to the current in a series circuit if one of the components fails? (2019)
A.
Current increases
B.
Current decreases
C.
Current stops
D.
Current remains the same
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Solution
In a series circuit, if one component fails, the current stops flowing through the entire circuit.
Correct Answer: C — Current stops
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Q. What happens to the density of a material when it is compressed? (2019)
A.
It decreases
B.
It increases
C.
It remains the same
D.
It becomes zero
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Solution
Density increases when a material is compressed, as mass remains constant while volume decreases.
Correct Answer: B — It increases
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Q. What happens to the equilibrium constant when a reaction is multiplied by a factor? (2023)
A.
It remains the same
B.
It is multiplied by the factor
C.
It is raised to the power of the factor
D.
It is divided by the factor
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Solution
When a balanced equation is multiplied by a factor, the equilibrium constant is raised to the power of that factor.
Correct Answer: C — It is raised to the power of the factor
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