Q. In the passage, the author suggests that addressing inequalities requires a multifaceted approach. Which of the following best exemplifies this idea?
A.Focusing solely on economic reforms.
B.Combining policy changes with cultural shifts.
C.Implementing educational programs only.
D.Ignoring historical contexts.
Solution
The author advocates for a combination of policy changes and cultural shifts to effectively address inequalities.
Correct Answer: B — Combining policy changes with cultural shifts.
Q. In the passage, the term 'sustainable practices' most closely refers to which of the following?
A.Methods that are economically beneficial.
B.Practices that do not deplete resources.
C.Techniques that are easy to implement.
D.Strategies that are popular among consumers.
Solution
The passage defines sustainable practices as those that maintain resource availability for future generations, aligning with environmental conservation.
Correct Answer: B — Practices that do not deplete resources.
Q. In the photoelectric effect, if the frequency of incident light is doubled, what happens to the kinetic energy of the emitted electrons?
A.It doubles
B.It quadruples
C.It remains the same
D.It becomes zero
Solution
The kinetic energy of the emitted electrons is given by KE = hf - φ. If the frequency is doubled, the kinetic energy increases by a factor of four, since KE is proportional to the frequency.
Q. In the photoelectric effect, the kinetic energy of the emitted electrons depends on which of the following?
A.Frequency of the incident light
B.Intensity of the incident light
C.Wavelength of the incident light
D.All of the above
Solution
The kinetic energy of the emitted electrons in the photoelectric effect depends on the frequency of the incident light, as per Einstein's photoelectric equation.
Correct Answer: A — Frequency of the incident light
Q. In the photoelectric effect, what happens to the emitted electrons if the frequency of the incident light is just at the threshold frequency?
A.They are emitted with maximum kinetic energy
B.They are emitted with zero kinetic energy
C.They are not emitted
D.They are emitted with negative kinetic energy
Solution
At the threshold frequency, the energy of the incident photons is equal to the work function, resulting in emitted electrons having zero kinetic energy.
Correct Answer: B — They are emitted with zero kinetic energy
Q. In the photoelectric effect, what happens to the kinetic energy of emitted electrons if the intensity of light is increased while keeping frequency constant?
A.Increases
B.Decreases
C.Remains the same
D.Becomes zero
Solution
The kinetic energy of emitted electrons remains the same as it depends on the frequency, not intensity.
Q. In the photoelectric effect, what happens to the kinetic energy of emitted electrons when the frequency of incident light is increased? (2021)
A.Increases
B.Decreases
C.Remains constant
D.Becomes zero
Solution
According to the photoelectric effect, the kinetic energy of emitted electrons increases with the frequency of the incident light, provided the frequency is above the threshold frequency.
Q. In the photoelectric effect, what happens to the kinetic energy of emitted electrons as the frequency of incident light increases? (2021)
A.Increases
B.Decreases
C.Remains constant
D.Becomes zero
Solution
According to the photoelectric effect, the kinetic energy of emitted electrons increases with the frequency of the incident light, provided the frequency is above the threshold frequency.
Q. In the photoelectric effect, what happens to the kinetic energy of the emitted electrons if the frequency of the incident light is increased?
A.It decreases
B.It remains constant
C.It increases
D.It becomes negative
Solution
The kinetic energy of the emitted electrons increases with the frequency of the incident light, as given by the equation KE = hf - φ, where φ is the work function.
