Undergraduate
Q. What are the roots of the equation x² - 5x + 6 = 0? (2021)
A.
1 and 6
B.
2 and 3
C.
3 and 2
D.
0 and 5
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Solution
The roots can be found using the factorization method: (x - 2)(x - 3) = 0, hence the roots are 2 and 3.
Correct Answer: B — 2 and 3
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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 does the term 'enthalpy' refer to? (2020)
A.
Internal energy plus pressure times volume
B.
Heat content of a system at constant pressure
C.
Total energy of a system
D.
Work done by the system
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Solution
Enthalpy refers to the heat content of a system at constant pressure, defined as internal energy plus pressure times volume.
Correct Answer: B — Heat content of a system at constant pressure
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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 entropy of an isolated system? (2020) 2020
A.
It decreases
B.
It remains constant
C.
It increases
D.
It can either increase or decrease
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Solution
According to the second law of thermodynamics, the entropy of an isolated system always increases over time.
Correct Answer: C — 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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Q. What happens to the equilibrium position when a catalyst is added to a reaction at equilibrium? (2023)
A.
Shifts to the right
B.
Shifts to the left
C.
No change
D.
Increases Kc
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Solution
A catalyst speeds up both the forward and reverse reactions equally, thus it does not change the position of equilibrium or the value of Kc.
Correct Answer: C — No change
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Q. What happens to the image distance when the object is moved closer to a concave mirror? (2021)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes negative
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Solution
As the object moves closer to a concave mirror, the image distance increases, and the image becomes larger and more distant.
Correct Answer: A — Increases
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Q. What happens to the image formed by a convex lens when the object is placed at a distance greater than twice the focal length? (2022)
A.
Virtual and erect
B.
Real and inverted
C.
Real and erect
D.
Virtual and inverted
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Solution
When the object is placed beyond twice the focal length, the image formed is real, inverted, and smaller than the object.
Correct Answer: B — Real and inverted
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Q. What happens to the induced EMF if the speed of the magnet moving through a coil is doubled? (2022)
A.
It remains the same
B.
It doubles
C.
It halves
D.
It quadruples
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Solution
The induced EMF doubles if the speed of the magnet moving through the coil is doubled.
Correct Answer: B — It doubles
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Q. What happens to the induced emf when the rate of change of magnetic flux increases? (2019)
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes zero
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Solution
The induced emf increases when the rate of change of magnetic flux increases, according to Faraday's Law.
Correct Answer: A — Increases
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Q. What happens to the magnetic field lines when a magnet is cut into two pieces? (2021)
A.
They disappear
B.
They become weaker
C.
Each piece becomes a magnet with its own field
D.
They merge into one
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Solution
When a magnet is cut into two pieces, each piece becomes a magnet with its own north and south poles, thus maintaining the magnetic field lines.
Correct Answer: C — Each piece becomes a magnet with its own field
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Q. What happens to the magnetic field strength inside a solenoid if the current is increased? (2021)
A.
It decreases
B.
It remains the same
C.
It increases
D.
It becomes zero
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Solution
The magnetic field strength inside a solenoid is directly proportional to the current flowing through it.
Correct Answer: C — It increases
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Q. What happens to the magnetic field when the current in a solenoid is reversed? (2023)
A.
It remains the same
B.
It disappears
C.
It reverses direction
D.
It doubles
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Solution
When the current in a solenoid is reversed, the direction of the magnetic field also reverses.
Correct Answer: C — It reverses direction
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Q. What happens to the magnetic field when the direction of current in a wire is reversed? (2023)
A.
The magnetic field remains unchanged
B.
The magnetic field direction reverses
C.
The magnetic field strength increases
D.
The magnetic field strength decreases
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Solution
Reversing the direction of current in a wire reverses the direction of the magnetic field around it.
Correct Answer: B — The magnetic field direction reverses
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Q. What happens to the magnetic field when the distance from a long straight conductor is doubled? (2023)
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
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Solution
The magnetic field around a long straight conductor decreases with distance. Specifically, it is inversely proportional to the distance from the conductor.
Correct Answer: B — It halves
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Q. What happens to the particles in a gas when the temperature increases? (2023)
A.
They move slower
B.
They move faster
C.
They stay the same
D.
They condense
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Solution
As the temperature increases, the kinetic energy of gas particles increases, causing them to move faster.
Correct Answer: B — They move faster
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Q. What happens to the particles in a solid when it is heated? (2023)
A.
They move closer together.
B.
They vibrate more vigorously.
C.
They become gas.
D.
They stop moving.
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Solution
When a solid is heated, its particles gain energy and vibrate more vigorously, potentially leading to a change in state.
Correct Answer: B — They vibrate more vigorously.
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Q. What happens to the particles of a solid when it is heated? (2023)
A.
They move closer together
B.
They vibrate faster
C.
They become a gas
D.
They lose mass
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Solution
When a solid is heated, its particles gain energy and vibrate faster, which can lead to a change in state.
Correct Answer: B — They vibrate faster
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Q. What happens to the pressure of a gas if the volume is decreased while the temperature remains constant?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Doubles
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Solution
According to Boyle's Law, if the volume decreases and temperature is constant, the pressure increases.
Correct Answer: A — Increases
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Q. What happens to the resistance of a semiconductor as it is illuminated? (2022)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes infinite
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Solution
The resistance of a semiconductor decreases when it is illuminated due to the generation of electron-hole pairs.
Correct Answer: B — Decreases
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Q. What happens to the temperature of a gas during an isothermal expansion? (2021)
A.
Increases
B.
Decreases
C.
Remains constant
D.
Varies with pressure
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Solution
During an isothermal expansion, the temperature of the gas remains constant as the system absorbs heat to do work.
Correct Answer: C — Remains constant
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Q. What happens to the volume of a gas when its temperature increases at constant pressure? (2020)
A.
Volume decreases
B.
Volume remains constant
C.
Volume increases
D.
Volume fluctuates
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Solution
According to Charles's Law, the volume of a gas increases with an increase in temperature at constant pressure.
Correct Answer: C — Volume increases
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Q. What hormone is primarily responsible for regulating blood glucose levels? (2020)
A.
Insulin
B.
Glucagon
C.
Cortisol
D.
Adrenaline
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Solution
Insulin is the hormone produced by the pancreas that lowers blood glucose levels by facilitating the uptake of glucose into cells.
Correct Answer: A — Insulin
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