Q. What happens to the average kinetic energy of gas molecules if the temperature is increased?
A.
It decreases.
B.
It remains constant.
C.
It increases.
D.
It becomes zero.
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Solution
The average kinetic energy of gas molecules is directly proportional to the absolute temperature. Therefore, increasing the temperature increases the average kinetic energy.
Correct Answer:
C
— It increases.
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Q. What happens to the average speed of gas molecules if the temperature is increased?
A.
It decreases
B.
It remains constant
C.
It increases
D.
It becomes zero
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Solution
As the temperature of a gas increases, the average speed of gas molecules also increases due to the increase in kinetic energy.
Correct Answer:
C
— It increases
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Q. What happens to the balancing length if the emf of the cell is increased while keeping the potentiometer wire constant?
A.
Balancing length increases
B.
Balancing length decreases
C.
No change in balancing length
D.
Balancing length becomes zero
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Solution
Increasing the emf of the cell increases the balancing length, as it requires a longer length to balance the higher voltage.
Correct Answer:
A
— Balancing length increases
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Q. What happens to the boiling point of a liquid when the atmospheric pressure decreases?
A.
It increases.
B.
It decreases.
C.
It remains the same.
D.
It becomes unpredictable.
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Solution
The boiling point of a liquid decreases with a decrease in atmospheric pressure.
Correct Answer:
B
— It decreases.
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Q. What happens to the boiling point of a solvent when a non-volatile solute is added?
A.
It decreases
B.
It remains the same
C.
It increases
D.
It becomes zero
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Solution
The boiling point of a solvent increases when a non-volatile solute is added due to boiling point elevation.
Correct Answer:
C
— It increases
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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 capacitance of a capacitor if the dielectric constant is doubled?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
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Solution
The capacitance C of a capacitor is directly proportional to the dielectric constant k. If k is doubled, C also doubles.
Correct Answer:
A
— It doubles
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Q. What happens to the capacitance of a parallel plate capacitor if the distance between the plates is halved?
A.
It doubles
B.
It halves
C.
It quadruples
D.
It remains the same
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Solution
Capacitance, C = ε₀ * A / d. If d is halved, C doubles.
Correct Answer:
A
— It doubles
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Q. What happens to the capacitance of a parallel plate capacitor if the distance between the plates is doubled?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
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Solution
Capacitance C = ε₀A/d; if d is doubled, C is halved.
Correct Answer:
B
— It halves
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Q. What happens to the capacitance of a parallel plate capacitor if the distance between the plates is increased? (2020)
A.
It increases
B.
It decreases
C.
It remains the same
D.
It becomes zero
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Solution
The capacitance (C) of a parallel plate capacitor is inversely proportional to the distance (d) between the plates. If d increases, C decreases.
Correct Answer:
B
— It decreases
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Q. What happens to the compass needle when you move towards the North Pole? (2019)
A.
It points straight down
B.
It points straight up
C.
It spins randomly
D.
It points towards the South
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Solution
As you approach the North Pole, the compass needle starts to point downwards due to the magnetic field lines converging.
Correct Answer:
A
— It points straight down
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Q. What happens to the conductivity of a semiconductor as temperature increases?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes zero
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Solution
The conductivity of a semiconductor increases with temperature due to the increased thermal energy that frees more charge carriers.
Correct Answer:
A
— Increases
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Q. What happens to the current in a circuit if the resistance is increased while the voltage remains constant?
A.
It increases
B.
It decreases
C.
It remains the same
D.
It becomes zero
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Solution
According to Ohm's Law, if resistance increases while voltage remains constant, the current decreases.
Correct Answer:
B
— It decreases
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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 and the resistance remains constant?
A.
It triples
B.
It doubles
C.
It halves
D.
It remains the same
Show solution
Solution
According to Ohm's Law, if 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 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.
Show solution
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 current in the galvanometer when the Wheatstone bridge is balanced?
A.
Increases
B.
Decreases
C.
Becomes zero
D.
Fluctuates
Show solution
Solution
When the Wheatstone bridge is balanced, the current in the galvanometer becomes zero.
Correct Answer:
C
— Becomes zero
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Q. What happens to the current through the galvanometer when the bridge is balanced?
A.
It increases.
B.
It decreases.
C.
It becomes zero.
D.
It becomes maximum.
Show solution
Solution
When the bridge is balanced, the current through the galvanometer becomes zero.
Correct Answer:
C
— It becomes zero.
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Q. What happens to the current through the galvanometer when the Wheatstone bridge is balanced?
A.
It increases
B.
It decreases
C.
It becomes zero
D.
It becomes infinite
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Solution
When the Wheatstone bridge is balanced, the potential difference across the galvanometer is zero, resulting in zero current through it.
Correct Answer:
C
— It becomes zero
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Q. What happens to the current through the galvanometer when the Wheatstone bridge is unbalanced?
A.
It becomes zero
B.
It increases
C.
It decreases
D.
It becomes infinite
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Solution
When the Wheatstone bridge is unbalanced, there is a non-zero potential difference across the galvanometer, causing current to flow through it.
Correct Answer:
B
— It increases
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Q. What happens to the current through the galvanometer when the Wheatstone bridge is perfectly balanced?
A.
It flows in one direction.
B.
It flows in both directions.
C.
It is zero.
D.
It is maximum.
Show solution
Solution
When the Wheatstone bridge is perfectly balanced, the current through the galvanometer is zero.
Correct Answer:
C
— It is zero.
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Q. What happens to the density of a fluid when it is heated?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Depends on the fluid
Show solution
Solution
When a fluid is heated, its density typically decreases as the fluid expands.
Correct Answer:
B
— Decreases
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Q. What happens to the density of a gas when it is compressed at constant temperature?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes zero
Show solution
Solution
According to the ideal gas law, compressing a gas at constant temperature increases its density.
Correct Answer:
A
— Increases
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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
Show solution
Solution
Density increases when a material is compressed, as mass remains constant while volume decreases.
Correct Answer:
B
— It increases
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