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 effect do gibberellins have on seed germination? (2020)
A.
Inhibit germination
B.
Promote germination
C.
No effect
D.
Delay germination
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Solution
Gibberellins promote seed germination by breaking dormancy and stimulating the growth of the embryo.
Correct Answer: B — Promote germination
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Q. What effect does increasing temperature have on the rate of a chemical reaction? (2023)
A.
Decreases the rate
B.
Increases the rate
C.
No effect
D.
Depends on the reaction
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Solution
Increasing temperature generally increases the rate of a chemical reaction due to higher kinetic energy.
Correct Answer: B — Increases the rate
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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 during telophase of mitosis? (2019)
A.
Chromosomes condense
B.
Nuclear envelope re-forms
C.
Spindle fibers disappear
D.
Both B and C
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Solution
During telophase, the nuclear envelope re-forms around the separated chromosomes, and spindle fibers disappear.
Correct Answer: D — Both B and C
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Q. What happens to the buoyant force when the density of the fluid increases? (2022)
A.
It decreases
B.
It increases
C.
It remains the same
D.
It becomes zero
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Solution
The buoyant force increases with the density of the fluid, as it is directly proportional to the fluid's density.
Correct Answer: B — It increases
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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 inserted? (2021)
A.
It increases
B.
It decreases
C.
It remains the same
D.
It becomes zero
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Solution
Inserting a dielectric material between the plates of a capacitor increases its capacitance due to the material's ability to reduce the electric field.
Correct Answer: A — 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 circuit if the voltage is tripled while the resistance remains constant? (2023)
A.
It triples.
B.
It halves.
C.
It remains the same.
D.
It increases by a factor of nine.
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Solution
According to Ohm's Law, if the voltage (V) is tripled and resistance (R) remains constant, the current (I) will also triple (I = V/R).
Correct Answer: A — It triples.
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Q. What happens to the current in a parallel circuit if one branch is removed? (2019)
A.
Current increases
B.
Current decreases
C.
Current remains the same
D.
Current stops
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Solution
In a parallel circuit, removing one branch does not affect the current in the other branches.
Correct Answer: C — Current remains the same
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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 density of a solid when it is subjected to uniform compression? (2020)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Depends on the material
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Solution
The density of a solid increases when it is subjected to uniform compression.
Correct Answer: A — Increases
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Q. What happens to the electric field when the charge is doubled while keeping the distance constant? (2023)
A.
It doubles
B.
It halves
C.
It quadruples
D.
It remains the same
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Solution
The electric field E is directly proportional to the charge, so if the charge is doubled, the electric field also doubles.
Correct Answer: A — It doubles
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Q. What happens to the electric potential energy when a capacitor is disconnected from a battery and the plates are moved further apart? (2023)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
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Solution
When a capacitor is disconnected from a battery and the plates are moved further apart, the electric potential energy increases because the capacitance decreases while the charge remains constant.
Correct Answer: A — 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 distance is increased in a convex lens? (2022)
A.
Image distance decreases
B.
Image distance increases
C.
Image distance remains the same
D.
Image distance becomes negative
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Solution
As the object distance increases in a convex lens, the image distance also increases, moving further away from the lens.
Correct Answer: B — Image distance increases
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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 distance when the object is moved closer to a convex lens than its focal length? (2023)
A.
Image distance increases
B.
Image distance decreases
C.
Image distance remains the same
D.
Image cannot be formed
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Solution
As the object is moved closer to the focal point of a convex lens, the image distance increases and the image becomes larger and virtual.
Correct Answer: A — Image distance 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 image when an object is moved closer to a convex lens than its focal length? (2019)
A.
Real and inverted
B.
Virtual and erect
C.
Real and erect
D.
Virtual and inverted
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Solution
When the object is placed within the focal length of a convex lens, the image formed is virtual and erect.
Correct Answer: B — Virtual and erect
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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 inside a solenoid when the current is increased? (2020)
A.
It decreases
B.
It remains constant
C.
It increases
D.
It becomes zero
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Solution
The magnetic field inside a solenoid is directly proportional to the current. Therefore, if the current is increased, the magnetic field also increases.
Correct Answer: C — It increases
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Q. What happens to the magnetic field strength inside a long solenoid if the current is doubled? (2021)
A.
It remains the same
B.
It doubles
C.
It quadruples
D.
It halves
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Solution
The magnetic field strength inside a solenoid is directly proportional to the current flowing through it. Therefore, doubling the current will double the magnetic field strength.
Correct Answer: B — It doubles
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