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BUMHS MDCAT 2023
BUMHS MDCAT 2023 Physics Portion
Each section/part of the Booklines MCQs for a chapter covers different topics, so please make sure to attempt all sections/parts.
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1. The induced emf in a coil is 1 V. What will be the rate of change of area of that coil placed in a constant magnetic field of strength 0.1 T (BUMHS 2023)
Using Faraday’s law of electromagnetic induction, emf = B * dA/dt. Given emf = 1 V, B = 0.1 T, solve for dA/dt.
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2. A low energy neutron has RBE factor of 10. How much energy is absorbed by a man of mass 80 Kg, if the value of equivalent dose is 400 rem (BUMHS 2023)
The energy absorbed can be calculated using the formula E = Dose * Mass / RBE factor.
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3. If the force is perpendicular to the direction of motion, the work done is (BUMHS 2023)
Work done is W = Fd cosθ. If the force is perpendicular (θ = 90°), then cos 90° = 0, so the work done is zero.
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4. Two point charges, each of magnitude q, are separated by a distance 2d. At a point mid-way between (BUMHS 2023)
The electric field at the midpoint between two equal but opposite charges cancels out, resulting in E = 0, but the potential V does not cancel out and remains non-zero.
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5. How much energy is converted in a resistor of 5 ohm carrying a current of 2.0 A after 10 seconds (BUMHS 2023)
The energy dissipated in a resistor is given by E = I^2Rt. Substituting the values, E = 2^2 * 5 * 10 = 200 J.
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6. The velocity ratio of a simple machine is the ratio of (BUMHS 2023)
The velocity ratio (VR) is the ratio of the distance moved by the effort to the distance moved by the load in a simple machine.
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7. An oscillator performing simple harmonic motion has a displacement x given by the equation x = 8.0 mm sin(10π/3 t). What is the displacement when t = 0.05s (BUMHS 2023)
Substituting t = 0.05 s into the equation for displacement, we can calculate the displacement at that specific time.
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8. The angle subtended at the center of a circle by an arc equal to 1/60th of a degree is called (BUMHS 2023)
One minute is equal to 1/60th of a degree, commonly used in angular measurements.
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9. The direction of centripetal acceleration in a circle (BUMHS 2023)
The centripetal acceleration is always directed towards the center of the circle, in the same direction as the centripetal force.
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10. The time constant of an RC circuit during discharge is that time in which charge on plates, as compared to maximum charge (q₀) becomes (BUMHS 2023)
The time constant of an RC circuit represents the time it takes for the charge or current to decay to 63.3% of its initial value during discharge.
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11. If Cv denotes molar specific heat at constant volume and ΔT is the change in temperature, then Cv ΔT gives (BUMHS 2023)
The change in internal energy of an ideal gas at constant volume is directly proportional to the temperature change and is given by Cv ΔT.
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12. A capacitor is charged with a battery and energy stored is U. After disconnecting the battery, another capacitor of the same capacity is connected in parallel to the first capacitor. Then the energy stored in each capacitor is (BUMHS 2023)
After the second capacitor is connected, the total charge is shared, and the energy in each capacitor becomes a fraction of the original stored energy.
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13. Coulomb’s law is only true for point charges whose sizes are (BUMHS 2023)
Coulomb’s law assumes point charges, meaning the law holds accurately when the charges are very small and can be treated as particles with negligible size.
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14. According to the wave-particle duality, identify respectively how all micro-particles (electrons, protons, atoms, etc.) behave when propagating and when exchanging energies (BUMHS 2023)
Micro-particles exhibit wave-like behavior during propagation and particle-like behavior when they exchange energy, in line with the principles of quantum mechanics.
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15. When the transverse wave passes, the particles of the medium oscillate (BUMHS 2023)
In a transverse wave, the particles of the medium move perpendicular to the direction in which the wave travels.
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16. A circuit that converts pulsating voltage of the rectifier to smooth voltage is known as (BUMHS 2023)
A filter in an electrical circuit is used to remove the AC component from the rectified voltage, resulting in smooth DC output.
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17. The longest wavelength of Lyman series is equal to (BUMHS 2023)
The longest wavelength in the Lyman series corresponds to the transition from n=2 to n=1 in a hydrogen atom, and this transition gives a wavelength proportional to 3/RH.
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18. A step down transformer is used to light a 12-volt, 24-mA lamp from the 240 mains. The current through the primary is 1.5 mA. What is the efficiency of the transformer (BUMHS 2023)
Efficiency of a transformer is the ratio of output power to input power. Using the current and voltage values for both the primary and secondary sides, efficiency can be calculated.
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19. An object of mass m moving with speed v has a head-on collision with another object of mass m moving with speed v in the opposite direction. If both objects stick together after the collision, what is the total loss of kinetic energy in the collision (BUMHS 2023)
The total loss in kinetic energy can be calculated by comparing the initial and final kinetic energy, considering that the objects stick together and form a combined mass.
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20. Which of the following types of waves require a medium for propagation (BUMHS 2023)
Sound waves are mechanical waves that require a medium (solid, liquid, or gas) to propagate, while electromagnetic waves do not require a medium.
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21. In earth’s gravitational field, the absolute potential at any point in space is (BUMHS 2023)
The gravitational potential at a distance from a planet is given by V = GM/r, where G is the gravitational constant, M is the mass of the Earth, and r is the distance from the center.
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22. Work done in raising a box depends on (BUMHS 2023)
The work done in lifting an object is given by W = mgh, where m is the mass of the object, g is the acceleration due to gravity, and h is the height.
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23. Time of flight of a projectile depends upon (BUMHS 2023)
The time of flight for a projectile depends on both the initial speed and the angle of launch, as they determine the vertical component of the motion.
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24. Which of the following is the S.I. unit of luminous intensity (BUMHS 2023)
The S.I. unit of luminous intensity, which measures the perceived power of light, is the candela.
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25. Which of the following has the largest energy (BUMHS 2023)
Energy of a photon is inversely proportional to its wavelength. The shorter the wavelength, the higher the energy.
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26. When a nucleus emits beta particle, its mass number remains constant but charge number increases by (BUMHS 2023)
When a nucleus emits a beta particle (an electron or positron), a neutron is converted into a proton, which increases the atomic number by 1 without changing the mass number.
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27. What physical quantity would result from a calculation in which a potential difference is multiplied by an electric charge (BUMHS 2023)
Electric energy is the product of charge and potential difference (voltage), calculated as E = Vq.
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28. A 100 W bulb and a 60 W bulb are connected in parallel. The total power consumed is (BUMHS 2023)
In a parallel circuit, the total power is the sum of the power consumed by each device. Thus, the total power consumption is 100 W + 60 W = 160 W.
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29. Which of the following is the capacitance of an air-filled capacitor with two parallel plates of area A and separation d (BUMHS 2023)
The capacitance C of a parallel plate capacitor is given by the formula C = ε₀A/d, where ε₀ is the permittivity of free space, A is the area of the plates, and d is the separation between the plates.
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30. Kinetic energy is product of two vectors. It is (BUMHS 2023)
Kinetic energy is a scalar quantity derived from the dot product of velocity and itself, as KE = ½ mv².
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31. What is the SI unit of conductivity (BUMHS 2023)
The unit of electrical conductivity is the reciprocal of resistivity, and the SI unit is mho per meter (mho m⁻¹).
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32. High-frequency vibration is of (BUMHS 2023)
High-frequency vibrations typically range from kilohertz to megahertz, and 0.1 MHz corresponds to 100,000 Hz, which falls within this range.
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33. The angle subtended by an object of height h and distance d from the observer is given as (BUMHS 2023)
The angle subtended by an object can be approximated as θ ≈ h/d when the angle is small, where h is the height and d is the distance.
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34. In British Engineering system, 1 Horse Power is (BUMHS 2023)
In the British Engineering system, 1 horsepower is defined as 550 foot-pounds per second, a measure of power.
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35. The resistance of a conductor is inversely proportional to (BUMHS 2023)
The resistance R of a conductor is given by R = ρL/A, where ρ is resistivity, L is length, and A is the cross-sectional area. Hence, resistance is inversely proportional to A.
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36. If the initial velocity u of the projectile is doubled, the height H of the projectile becomes (BUMHS 2023)
The maximum height of a projectile is proportional to the square of the initial velocity. If the velocity is doubled, the height becomes four times greater.
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37. A solenoid of length 10 cm has magnetic flux density B = 0.50T. When the same solenoid is wound on an iron core, then its flux density is increased by (BUMHS 2023)
The magnetic flux density increases significantly when a solenoid is wound on an iron core due to the high permeability of iron.
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38. A low voltage supply with an emf of 20 V and an internal resistance of 1.5 ohms is used to supply power to a heater of resistance 6.5 ohms in a fish tank. What is the power supplied to the water in the fish tank (BUMHS 2023)
Using the formula for power: P = V² / (R + r), where R is the resistance of the heater and r is the internal resistance of the power supply.
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39. Which one is a variable capacitor (BUMHS 2023)
A ceramic trimmer capacitor is a type of variable capacitor that allows for the adjustment of capacitance in electronic circuits.
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40. Angular displacement is a vector quantity only when the (BUMHS 2023)
Angular displacement is a vector quantity when dealing with small angular displacements, allowing for the direction to be defined.
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41. The magnetic field depends upon (BUMHS 2023)
The magnetic field is influenced by the strength of the current, the distance from the source, and the direction of the field relative to the source.
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42. The magnetic flux through an area A in a uniform magnetic field B is given as (BUMHS 2023)
The magnetic flux through an area is calculated as the product of the magnetic field strength and the area, assuming the field is perpendicular to the surface.
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43. The angle subtended at the center of a circle by an arc equal to 1/360th of a degree is called (BUMHS 2023)
One second is equal to 1/3600th of a degree, a smaller unit used in angular measurements, especially in astronomy.
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44. Volt can also be written as (BUMHS 2023)
Volt is defined as joules per coulomb, i.e., the amount of energy per unit charge.
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45. De Broglie received the Nobel Prize in the year (BUMHS 2023)
De Broglie was awarded the Nobel Prize in Physics in 1929 for his work on the wave nature of electrons.
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46. When a gas is compressed isothermally, the product of its pressure and volume during the process is (BUMHS 2023)
In an isothermal process, the temperature remains constant, and by Boyle’s Law, the product of pressure and volume remains constant.
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47. The minimum gradient of a curve on a displacement-time graph of a ball thrown vertically upwards and caught back at the same point after falling down can be (BUMHS 2023)
At the highest point in the motion, the velocity of the ball becomes zero momentarily, which corresponds to a zero gradient in the displacement-time graph.
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48. Which of the following is NOT correct about potentiometer (BUMHS 2023)
Potentiometers are highly sensitive devices for measuring voltage because they eliminate error by balancing the potential difference in the circuit.
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49. A coil of area 1 m² has 100 turns. It rotates with constant angular velocity about an axis along its diameter perpendicular to earth’s magnetic field of 1×10⁻⁵ T. The angular velocity for induced emf of 1 mV is (BUMHS 2023)
The induced emf in a rotating coil depends on the angular velocity, the number of turns, area, and the strength of the magnetic field. Here, 1 rad/s is the correct angular velocity.
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50. Work done on a rod moving in a magnetic field across magnetic field and generate an emf in the system. This statement is according to Lenz’s law of conservation of (BUMHS 2023)
Lenz’s law is based on the conservation of energy, stating that the induced emf will always act in such a way as to oppose the change that caused it.
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51. Doppler effect can be observed by (BUMHS 2023)
The Doppler effect applies to both sound waves (longitudinal) and light waves (electromagnetic) and describes the change in frequency due to relative motion.
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52. Electric field lines are (BUMHS 2023)
Electric field lines are a conceptual representation used to illustrate the direction and strength of the electric field; they are not physical entities, hence they are imaginary.
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53. If the value of acceleration due to gravity ‘g’ is reduced to half, the time of flight ‘T’ of projectile becomes (BUMHS 2023)
The time of flight for a projectile is inversely proportional to the acceleration due to gravity. If gravity is halved, the time of flight doubles.
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