Q154 / 200 · MHT CET - Medical 2026 (23 April Shift 2) · Physics
Which of the following statements is NOT TRUE about pseudo forces?
Pseudo forces
a. not accountable as per Newton's laws of motion in the inertial frame.
b. not among any of the four fundamental forces.
c. are imaginary.
d. are measurable.
Pseudo forces
a. not accountable as per Newton's laws of motion in the inertial frame.
b. not among any of the four fundamental forces.
c. are imaginary.
d. are measurable.
- Correct answerAc
- Ba
- Cd
- Db
Solution
To determine which statement is NOT true about pseudo forces, let us evaluate each option:
1. not accountable as per Newton's laws of motion in the inertial frame: True. Pseudo forces are introduced only in non-inertial (accelerating) frames of reference to make Newton's laws of motion applicable. They do not exist and are not required in an inertial frame.
2. not among any of the four fundamental forces: True. The four fundamental forces of nature are gravitational, electromagnetic, strong nuclear, and weak nuclear forces. Pseudo forces do not arise from any physical interaction between bodies, so they are not fundamental forces.
3. are measurable: True. In a non-inertial frame, pseudo forces have real, observable, and measurable effects. For example, the centrifugal force in a rotating frame or the Coriolis force can be measured using physical instruments like a spring balance or by observing the acceleration of a mass in that frame.
4. are imaginary: False. While pseudo forces are often called "fictitious" because they do not arise from fundamental physical interactions, they are not "imaginary." They have real, measurable physical effects on objects observed from a non-inertial reference frame (such as a person feeling pushed back in an accelerating car).
Therefore, the statement that pseudo forces are imaginary is NOT true.
Answer: c
1. not accountable as per Newton's laws of motion in the inertial frame: True. Pseudo forces are introduced only in non-inertial (accelerating) frames of reference to make Newton's laws of motion applicable. They do not exist and are not required in an inertial frame.
2. not among any of the four fundamental forces: True. The four fundamental forces of nature are gravitational, electromagnetic, strong nuclear, and weak nuclear forces. Pseudo forces do not arise from any physical interaction between bodies, so they are not fundamental forces.
3. are measurable: True. In a non-inertial frame, pseudo forces have real, observable, and measurable effects. For example, the centrifugal force in a rotating frame or the Coriolis force can be measured using physical instruments like a spring balance or by observing the acceleration of a mass in that frame.
4. are imaginary: False. While pseudo forces are often called "fictitious" because they do not arise from fundamental physical interactions, they are not "imaginary." They have real, measurable physical effects on objects observed from a non-inertial reference frame (such as a person feeling pushed back in an accelerating car).
Therefore, the statement that pseudo forces are imaginary is NOT true.
Answer: c
Hence, the correct answer is option: 'A'.