1. In a practical experiment using a potentiometer to measure the emf
of a cell, which of the following variables should be kept constant?
A. The length of the potentiometer wire
B. The current through the wire
C. The temperature of the wire
D. The resistance of the cell
Answer: A) The length of the potentiometer wire
Rationale: The length of the potentiometer wire needs to be constant to
ensure accurate measurements of emf by creating a uniform potential
gradient.
2. In an experiment to determine the Young’s modulus of a material,
which of the following measurements is crucial?
A. The thickness of the material
B. The elongation of the material under force
C. The type of force applied
D. The type of material
Answer: B) The elongation of the material under force
Rationale: Young’s modulus is calculated by measuring the elongation
of a material when a force is applied, which relates stress and strain.
,3. In the experiment to verify the laws of reflection using a plane
mirror, what is the key observation?
A. The angle of incidence equals the angle of reflection
B. The angle of incidence is greater than the angle of reflection
C. The angle of incidence is less than the angle of reflection
D. The image formed is real and inverted
Answer: A) The angle of incidence equals the angle of reflection
Rationale: The law of reflection states that the angle of incidence is
always equal to the angle of reflection for a plane mirror.
4. In the experiment to measure the speed of sound using a tube filled
with air, how is the resonance condition detected?
A. By using a tuning fork
B. By measuring the time of flight of sound
C. By observing the change in frequency
D. By hearing a loud sound or observing a sharp increase in sound
intensity
Answer: D) By hearing a loud sound or observing a sharp increase in
sound intensity
Rationale: The resonance condition is detected when the sound
intensity sharply increases, indicating constructive interference and
resonance.
, 5. In a practical experiment to measure the potential difference in a
series circuit, where should the voltmeter be connected?
A. Across the battery
B. Across each resistor in the circuit
C. Across the entire circuit
D. In series with the resistors
Answer: B) Across each resistor in the circuit
Rationale: The voltmeter should be connected across each resistor to
measure the potential difference across each individual component.
6. When performing the experiment on the relationship between the
current and voltage for a resistor, which of the following is most
important to maintain?
A. The temperature of the resistor
B. The length of the resistor
C. The ambient temperature
D. The power supply voltage
Answer: A) The temperature of the resistor
Rationale: The resistance of a material depends on its temperature. For
accurate measurements, the temperature should remain constant to
ensure a linear relationship between voltage and current.
of a cell, which of the following variables should be kept constant?
A. The length of the potentiometer wire
B. The current through the wire
C. The temperature of the wire
D. The resistance of the cell
Answer: A) The length of the potentiometer wire
Rationale: The length of the potentiometer wire needs to be constant to
ensure accurate measurements of emf by creating a uniform potential
gradient.
2. In an experiment to determine the Young’s modulus of a material,
which of the following measurements is crucial?
A. The thickness of the material
B. The elongation of the material under force
C. The type of force applied
D. The type of material
Answer: B) The elongation of the material under force
Rationale: Young’s modulus is calculated by measuring the elongation
of a material when a force is applied, which relates stress and strain.
,3. In the experiment to verify the laws of reflection using a plane
mirror, what is the key observation?
A. The angle of incidence equals the angle of reflection
B. The angle of incidence is greater than the angle of reflection
C. The angle of incidence is less than the angle of reflection
D. The image formed is real and inverted
Answer: A) The angle of incidence equals the angle of reflection
Rationale: The law of reflection states that the angle of incidence is
always equal to the angle of reflection for a plane mirror.
4. In the experiment to measure the speed of sound using a tube filled
with air, how is the resonance condition detected?
A. By using a tuning fork
B. By measuring the time of flight of sound
C. By observing the change in frequency
D. By hearing a loud sound or observing a sharp increase in sound
intensity
Answer: D) By hearing a loud sound or observing a sharp increase in
sound intensity
Rationale: The resonance condition is detected when the sound
intensity sharply increases, indicating constructive interference and
resonance.
, 5. In a practical experiment to measure the potential difference in a
series circuit, where should the voltmeter be connected?
A. Across the battery
B. Across each resistor in the circuit
C. Across the entire circuit
D. In series with the resistors
Answer: B) Across each resistor in the circuit
Rationale: The voltmeter should be connected across each resistor to
measure the potential difference across each individual component.
6. When performing the experiment on the relationship between the
current and voltage for a resistor, which of the following is most
important to maintain?
A. The temperature of the resistor
B. The length of the resistor
C. The ambient temperature
D. The power supply voltage
Answer: A) The temperature of the resistor
Rationale: The resistance of a material depends on its temperature. For
accurate measurements, the temperature should remain constant to
ensure a linear relationship between voltage and current.
