Most Repeated MDCAT Physics MCQs

Most-repeated Physics chapters

Each chapter below has its own page of most-repeated questions — with verified answers, explanations and the exact exam years each recurred in. Ranked by how many of its questions recur across 2+ years.

More repeated Physics questions

Repeated Physics questions from chapters that don't yet have their own page — each with the verified answer, explanation and the years it recurred.

1. 1

   Repeated in 4 yearsOscillations and Simple Harmonic Motion

   Two springs fixed at one end are stretched by 5 cm and 10 cm, respectively, when masses 0.5 kg and 1 kg are suspended at their lower ends. When displaced slightly from their mean positions and released, they will oscillate with time periods in the ratio

   • A1:√2✓
   • B2:1

   Explanation

   This is the correct answer. The time period of a spring-mass system is given by T = 2π√(m/k), where T is the time period, m is the mass, and k is the spring constant. Since the spring constant is the same for both springs (as the same force produces the same extension), the ratio of the time periods will only depend on the ratio of the masses: T1/T2 = √(m1/m2). Substituting the given masses, we get T1/T2 = √(0.5 kg / 1 kg) = √(1/2) = 1/√2.

   Appeared in the past papers of: 2009, 2013, 2017, 2023

2. 2

   Repeated in 3 yearsMiscellaneous

   A stone thrown horizontally from the top of a tall building follows a path that is:

   • ACircular
   • BMade of two straight line segments
   • CHyperbolic
   • DParabolic✓

   Explanation

   When a stone is thrown horizontally from the top of a tall building, it experiences only the force of gravity acting vertically downward. Since there is no initial vertical velocity, the stone's motion is governed solely by the downward force of gravity. The path of the stone is a result of the combination of its horizontal velocity (due to the initial throw) and the vertical acceleration due to gravity. As the stone falls vertically, it also continues to move horizontally due to its initial horizontal velocity. The resulting trajectory of the stone is a curved path known as a parabola.

   Appeared in the past papers of: 2022, 2023, 2024

3. 3

   Repeated in 3 yearsMiscellaneous

   When a gas is compressed isothermally, the product of its pressure and volume during the process is:

   • Anot constant
   • Bconstant✓
   • Czero
   • Dproportional

   Appeared in the past papers of: 2022, 2023, 2024

4. 4

   Repeated in 3 yearsMiscellaneous

   Gauss law cannot be used to find which of the following quantity?

   • AElectric field intensity
   • BElectric flux density
   • CCharge
   • Dpermittivity✓

   Explanation

   Gauss's law cannot be used to find permittivity (εo). The value of the permittivity of free space is a fundamental constant in electromagnetism, and it is not determined through Gauss's law.

   Appeared in the past papers of: 2022, 2023, 2024

5. 5

   Repeated in 3 yearsMiscellaneous

   Working principal of magnetic levitation train is according to?

   • AFaraday law
   • BMax planks law
   • COhm law
   • DLenz law✓

   Explanation

   Lenz's law is applicable to the operation of magnetic levitation trains. Lenz's law states that an induced current opposes the change in magnetic field that produces it. In the case of magnetic levitation trains, Lenz's law helps maintain the stability and control of the levitation system by opposing any changes in the magnetic field caused by the motion of the train.

   Appeared in the past papers of: 2022, 2023, 2024

6. 6

   Repeated in 3 yearsFSc Qbank

   The rest mass of photon is:

   • AInfinite
   • BZero✓
   • C1.6 x 10-27 kg
   • D3 x 108 kg

   Explanation

   The rest mass of a photon is 0. This is because photons are particles of light and they always move at the speed of light in a vacuum. According to the theory of relativity, any particle that moves at the speed of light must have zero rest mass. Therefore, the rest mass of a photon is 0.m0​=0where (m0) is the rest mass of the photon.

   Appeared in the past papers of: 2013, 2014, 2023

7. 7

   Repeated in 3 yearsMiscellaneous

   Which statement describes the electrical potential difference between two points in a wire carrying a current?

   • AThe force required to move a unit positive charge between the points
   • BThe ratio of the energy dissipated between the points to the current
   • CThe ratio of the power dissipated between the points to the current✓
   • DThe ratio of the power dissipated between the points to the charge moved
   • ENone of the above

   Explanation

   As, P=VI V= P/I. Hence option C is correct.

   Appeared in the past papers of: 2009, 2013, 2016

8. 8

   Repeated in 3 yearsAtomic Structure

   Shape of the orbital occupied by an electron is defined by:

   • AAzimuthal quantum number✓
   • BPrincipal quantum number
   • CMagnetic quantum number
   • DSpin quantum number

   Explanation

   This is the correct answer. The azimuthal quantum number, also known as the angular momentum quantum number, determines the shape of an atomic orbital. It is denoted by the letter l. The possible values of l depend on the principal quantum number (n). For a given n, l can have values from 0 to n-1.

   Appeared in the past papers of: 2016, 2023, 2024

9. 9

   Repeated in 3 yearsDawn of Modern Physics

   When an electron and its anti particle position come close enough to each other, they Completely convert into radiation energy in the form of photons, this process Is called:

   • AAnnihilation✓
   • BPair production
   • CCompton scattering
   • DPhotoelectric effect

   Explanation

   This is the correct answer. When an electron and its antiparticle, a positron, come into contact, they undergo a process called annihilation. In this process, the mass of both particles is completely converted into pure energy, which is emitted in the form of photons. This process is a fundamental interaction in particle physics and is essential for understanding the behavior of matter and antimatter.

   Appeared in the past papers of: 2018, 2023, 2024

10. 10

    Repeated in 3 yearsOscillations and Simple Harmonic Motion

    In simple harmonic motion, a particle is oscillating in such a way that its total energy remains conserved. When this particle reaches its two extreme positions, its potential energy at the extreme positions become:

    • AMinimum
    • BMaximum✓
    • CZero
    • DGreater than its kinetic energy

    Explanation

    In SHM, kinetic energy is maximum at mean position and zero at the extreme positions while potential energy is zero at mean position and maximum at the extreme positions. In SHM when a particle reach its extreme position so at that point its velocity become zero and all the energy it has is just potential energy because if we drop the particle from extreme position so it come back to its originsl position without any externsl force by using its stored potential energy and these extreme positions are the positions where the particle have maximum potential energy. Result: So at extreme postions potential enegy is maximum and at starting point it is minimum.

    Appeared in the past papers of: 2018, 2023, 2024

11. 11

    Repeated in 3 yearsAtomic Spectra

    Which X-ray photon will have the longest wavelength?

    • AK alpha
    • BK beta
    • CK gamma
    • DM series✓

    Explanation

    M X-ray photons will have the longest wavelength because they correspond to transitions involving lower energy differences compared to Kα, Kβ, and Kγ photons.

    Appeared in the past papers of: 2022, 2023, 2024

12. 12

    Repeated in 2 yearsMiscellaneous

    What is the shape of velocity-time graph for constant acceleration?

    • AParabola line
    • BStraight line✓
    • CIncline curve
    • DDecline curve

    Explanation

    In the case of constant acceleration, the velocity-time graph will be a straight line. The slope of this line represents the acceleration. If the slope is positive, it indicates positive acceleration (increasing velocity), while a negative slope represents negative acceleration (decreasing velocity). The steeper the slope, the greater the acceleration.

    Appeared in the past papers of: 2022, 2024

13. 13

    Repeated in 2 yearsMiscellaneous

    The consumption of energy by a 60 W bulb in 2 s is:

    • A120 J✓
    • B60 J
    • C30 J
    • D0.02 J

    Explanation

    Given: Power = P = 60 watt Time = t = 2 seconds Energy = E = ?

    Appeared in the past papers of: 2022, 2024

14. 14

    Repeated in 2 yearsMiscellaneous

    Ignoring details associated with friction, extra forces exerted by arm and leg muscles, and other factors, we can consider a pole vault as the conversion of an athlete's running kinetic energy to gravitational potential energy. If an athlete is to lift his body 5m during a vault, what speed must he have when he plants his pole?

    • A5 m/s
    • B10 m/s✓
    • C15 m/s
    • D20 m/s

    Explanation

    Given: Distance = S = 5m Acceleration = a = g = 10ms-2 Initial velocity = Vi = 0 ms-1 Final velocity = Vf = ?

    Appeared in the past papers of: 2022, 2024

15. 15

    Repeated in 2 yearsMiscellaneous

    The number of revolutions in 3π radians is:

    • A1/60
    • B3/2✓
    • C2
    • D6

    Explanation

    As we know that: 2π radians is equal to one revolution and 3π radians to x revolutions. Using the proportion, we can solve for x (2π radians / one revolution) = (3π radians) / (x revolutions) Cross multiplying: 2πx = 3π Dividing both sides by 2π: x = 3π / 2π x = 3 / 2 Therefore, the number of revolutions in 3π radians is 3/2.

    Appeared in the past papers of: 2022, 2024

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