0% Physics - MDCATPhysics in the MDCAT tests core principles and their application in medicine. It is a key section of the standardised entrance exam for Pakistani medical and dental colleges. The subject evaluates problem-solving skills essential for understanding medical technology and biomechanics. 1 / 100In a Millikan's oil drop experiment, an oil drop of mass 3.2 × 10⁻¹³ kg is held stationary between two plates 1 cm apart with a potential difference of 1000 V. The charge on the drop is (g = 10 m/s²): 4.8 × 10⁻¹⁹ C 3.2 × 10⁻¹⁹ C 6.4 × 10⁻¹⁹ C 1.6 × 10⁻¹⁹ C 2 / 100According to Newton's second law of motion: F = ma F = mv F = m/a F = mgh 3 / 100The specific heat capacity of water in J/kg·K is approximately: 4180 418 4.18 41800 4 / 100A radioactive element decays such that its activity reduces to 1/16 of its initial value in 80 days. Its half-life is: 20 days 40 days 80 days 10 days 5 / 100The number of significant figures in 0.00580 is: 3 6 2 5 6 / 100A convex lens of focal length 20 cm is placed in contact with a concave lens of focal length 10 cm. The power of the combination is: +10 D -10 D +5 D -5 D 7 / 100A body is projected with a kinetic energy K. At the highest point of its trajectory, its kinetic energy is 3K/4. The angle of projection is: 45° 60° 30° 90° 8 / 100A convex lens is: Of uniform thickness throughout Thicker at the center than at the edges Thicker at the edges than at the center Also known as a diverging lens 9 / 100The lens which is thicker in the middle than at the edges is a: Cylindrical lens Convex lens Plano-concave lens Concave lens 10 / 100In a standing wave, the points of maximum amplitude are called: Troughs Nodes Crests Antinodes 11 / 100 In a parallel circuit, which of the following remains the same across all components? Current Voltage Resistance Power 12 / 100The SI unit of force is: Newton Pascal Watt Joule 13 / 100A satellite is in a circular orbit around the Earth. If its orbital radius is doubled, its orbital velocity will become: √2 times 4 times 1/√2 times 2 times 14 / 100A body is projected vertically upward with a velocity equal to half the escape velocity from Earth's surface. The maximum height it reaches is: (R = Earth's radius) R/4 R/5 R/2 R/3 15 / 100 A beam of light passes from air into water. Which of the following does NOT change? Direction Frequency Wavelength Speed 16 / 100The specific heat capacity of water is: 4.18 J/g°C 1 J/g°C 10 J/g°C 100 J/g°C 17 / 100The unit of power is: Joule Watt Newton Pascal 18 / 100According to Ohm's Law: V = IR I = VR V = I/R R = VI 19 / 100A 100 W bulb operates for 10 hours. The energy consumed is: 10 kWh 100 kWh 0.1 kWh 1 kWh 20 / 100A fluid is flowing through a pipe of varying cross-section. If the area is halved, the speed of flow becomes:A fluid is flowing through a pipe of varying cross-section. If the area is halved, the speed of flow becomes: One-fourth Four times Double Half 21 / 100A body of mass 5 kg is moving with a velocity of 10 m/s. A force is applied for 2 seconds, after which its velocity becomes 20 m/s. The magnitude of the applied force is: 75 N 25 N 50 N 100 N 22 / 100A car travels 60 km in the first hour and 80 km in the second hour. What is its average speed for the entire journey? 140 km/h 80 km/h 70 km/h 60 km/h 23 / 100Which of the following is a scalar quantity? Acceleration Velocity Force Speed 24 / 100A body is in equilibrium when: All of the above It is moving with constant velocity It is at rest The net force acting on it is zero 25 / 100In a Young's double-slit experiment, if the distance between slits is increased, the fringe width: Decreases Increases Becomes zero Remains the same 26 / 100In a moving coil galvanometer, the deflection θ is proportional to: 1/I √I I² I 27 / 100 A uniform rod of length L and mass M is pivoted at one end. Its moment of inertia about the pivot is: ML²/3 ML²/12 2ML²/3 ML² 28 / 100In a nuclear reactor, the function of a moderator is to: Accelerate neutrons Slow down neutrons Absorb neutrons Reflect neutrons 29 / 100The rate of change of displacement is called: Speed Acceleration Velocity Momentum 30 / 100A wire of resistance 10 Ω is stretched to double its length. Its new resistance will be: 10 Ω 30 Ω 20 Ω 40 Ω 31 / 100 A monoatomic gas is compressed adiabatically. The ratio of its final pressure to initial pressure is 8. The ratio of its final volume to initial volume is: 1/2 1/16 1/4 1/8 32 / 100A proton and an electron are accelerated through the same potential difference. The ratio of their de Broglie wavelengths (λ_p/λ_e) is: 1 m_p/m_e √(m_e/m_p) √(m_p/m_e) 33 / 100The mirror used by dentists to see an enlarged image of teeth is: Convex mirror Concave mirror Plane mirror Cylindrical mirror 34 / 100A projectile is launched at an angle of 30° to the horizontal with a velocity of 40 m/s. What is its time of flight? (g = 10 m/s²) 4 s 8 s 2 s 6 s 35 / 100The unit of frequency is: Meter Second Decibel Hertz 36 / 100Which of the following is a scalar quantity? Speed Force Acceleration Velocity 37 / 100The critical angle for a material is 30°. Its refractive index is: 1.5 2.0 1.0 0.5 38 / 100A capacitor of 4 μF is charged to 100 V. The energy stored in it is: 0.04 J 0.16 J 0.08 J 0.02 J 39 / 100Three resistors of 2 Ω, 3 Ω, and 6 Ω are connected in parallel. Their equivalent resistance is: 0.5 Ω 11 Ω 1.5 Ω 1 Ω 40 / 100The momentum of an object is defined as the product of its: Force and time Weight and velocity Mass and acceleration Mass and velocity 41 / 100When a wave passes from one medium to another, which property remains unchanged? Amplitude Wavelength Frequency Speed 42 / 100Two forces of 5 N and 12 N act at a right angle to each other. The magnitude of their resultant is: 13 N 60 N 17 N 7 N 43 / 100In a convex mirror, the image formed is always: Virtual and erect Virtual and inverted Real and erect Real and inverted 44 / 100The kinetic energy of a body of mass 2 kg moving at 10 m/s is: 100 J 50 J 20 J 200 J 45 / 100The half-life of a radioactive element is 10 days. What fraction of the original sample remains after 30 days? 1/4 1/16 1/8 1/2 46 / 100The de Broglie wavelength associated with an electron accelerated through 100 V is approximately: 1.23 Å 12.3 Å 0.123 Å 123 Å 47 / 100The splitting of white light into its constituent colors is called: Diffraction Refraction Dispersion Reflection 48 / 100 A transformer works on the principle of: Self-induction Electrostatic induction Mutual induction Electrical conduction 49 / 100The angle of projection for maximum range of a projectile is: 30° 45° 60° 90° 50 / 100In a hydrogen atom, an electron jumps from the n=4 to n=1 level. The number of possible spectral lines emitted is: 3 6 5 4 51 / 100A wire of resistance 10 Ω is stretched to double its length. Its new resistance is: 30 Ω 10 Ω 40 Ω 20 Ω 52 / 100A particle executes SHM with amplitude A. Its speed is half the maximum speed when its displacement from the mean position is: A/4 A/2 (√3/2)A A/√2 53 / 100The acceleration due to gravity on the surface of the Moon, compared to Earth, is approximately: Six times greater Ten times less Six times less The same 54 / 100 In a nuclear reactor, the control rods are made of: Plutonium Uranium Cadmium or Boron Graphite 55 / 100According to Newton's First Law of Motion, a body in rest will remain in rest unless acted upon by: A gravitational force An internal force A balanced force An unbalanced external force 56 / 100The wavelength of the Kα X-ray line for an element with atomic number Z is proportional to: 1/Z² Z² Z 1/Z 57 / 100The energy of a photon is given by E = hf, where 'h' is: Universal constant Hubble's constant Boltzmann constant Planck's constant 58 / 100 A satellite is in a circular orbit around the Earth. If its orbital radius is doubled, its orbital velocity: Halves Becomes 1/√2 times Becomes √2 times Doubles 59 / 100The unit of magnetic flux is: Tesla Gauss Henry Weber 60 / 100Ohm's Law states the relationship between: Power, current, and voltage Charge, current, and time Energy, power, and time Voltage, current, and resistance 61 / 100The half-life of a radioactive element is 10 days. How long will it take for ¾ of the sample to decay? 25 days 20 days 15 days 10 days 62 / 100The force experienced by a current-carrying conductor in a magnetic field is given by: F = ILB sinθ F = IB/L F = IL/B F = I²LB 63 / 100The critical angle for a material is 30°. Its refractive index is: 2.0 1.0 0.5 1.5 64 / 100 Which color of light has the longest wavelength? Green Violet Blue Red 65 / 100A Carnot engine operates between temperatures of 400 K and 300 K. Its efficiency is: 100% 25% 50% 75% 66 / 100A particle executes SHM with amplitude A. Its speed is half the maximum speed when its displacement is: A/2 A/4 A/√2 (√3/2)A 67 / 100The phenomenon by which a compass needle aligns itself in a north-south direction is due to: Earth's magnetic field Earth's gravitational field Earth's electric field Earth's atmospheric pressure 68 / 100A body of mass 5 kg is moving with a velocity of 10 m/s. Its momentum is: 15 kg·m/s 50 kg·m/s 2 kg·m/s 0.5 kg·m/s 69 / 100 A car accelerates uniformly from rest to a velocity of 20 m/s in 5 seconds. The distance covered in the third second is: 6 m 10 m 8 m 4 m 70 / 100Which of the following electromagnetic waves has the shortest wavelength? Microwaves Infrared Radio waves X-rays 71 / 100The fundamental frequency of an open organ pipe is 300 Hz. The frequency of the first overtone is: 900 Hz 300 Hz 600 Hz 450 Hz 72 / 100A force of 10 N is applied to an object, causing it to move 5 meters in the direction of the force. The work done is: 2 J 50 J 0.5 J 15 J 73 / 100Two charges of +4 μC and -4 μC are placed 2 cm apart. The dipole moment of this system is: 8 × 10⁻⁸ C·m 2 × 10⁻⁸ C·m 1 × 10⁻⁸ C·m 4 × 10⁻⁸ C·m 74 / 100The energy stored in a stretched spring is: Kinetic energy Potential energy Chemical energy Thermal energy 75 / 100The splitting of white light into its constituent colors is called: Reflection Refraction Dispersion Diffraction 76 / 100 In a p-type semiconductor, the majority charge carriers are: Electrons Holes Neutrons Protons 77 / 100A 2 kg mass is attached to a spring of constant 200 N/m. The period of oscillation is: 0.4π s 0.8π s 0.2π s 0.1π s 78 / 100The process by which a liquid changes into a gas at its boiling point is called: Boiling Evaporation Sublimation Condensation 79 / 100 A ball is thrown vertically upwards with a velocity of 20 m/s. The maximum height it will reach is (g = 10 m/s²): 30 m 40 m 10 m 20 m 80 / 100The SI unit of electric current is: Coulomb Ampere Volt Ohm 81 / 100A 100 W bulb operates for 10 hours. The electrical energy consumed is: 1 kWh 100 kWh 10 kWh 0.1 kWh 82 / 100In a photoelectric experiment, the stopping potential is 2 V. The maximum kinetic energy of emitted electrons is: 0.5 eV 1 eV 2 eV 2 J 83 / 100A wave has a frequency of 50 Hz and a wavelength of 2 m. Its speed is: 25 m/s 50 m/s 200 m/s 100 m/s 84 / 100The time period of a simple pendulum depends on: Its length The material of the bob The amplitude of swing Its mass 85 / 100A force of 10 N is applied to an object and displaces it by 5 m in the direction of the force. The work done is: 15 J 0.5 J 50 J 2 J 86 / 100A car travels 60 km in the first hour and 80 km in the second hour. What is its average speed for the entire journey? 140 km/h 70 km/h 60 km/h 80 km/h 87 / 100The SI unit of electric charge is: Ohm Ampere Volt Coulomb 88 / 100The mass of an object is a measure of its: Volume Weight Density Inertia 89 / 100The first law of thermodynamics is essentially a statement of the conservation of: Mass Momentum Energy Charge 90 / 100In Young's double-slit experiment, if the distance between slits is doubled, the fringe width: Quadruples Doubles Remains the same Halves 91 / 100A particle of mass m is moving in a circle of radius r with constant speed v. The work done by the centripetal force during one complete revolution is: mv²/r Zero πmv² 2πmv² 92 / 100In a hydrogen atom, the electron transitions from n=3 to n=1. The emitted photon's energy is: 1.89 eV 12.1 eV 13.6 eV 10.2 eV 93 / 100A 2 kg block slides down a 30° inclined plane with an acceleration of 2 m/s². The frictional force acting on it is: (g = 10 m/s²) 4 N 2 N 8 N 6 N 94 / 100The first law of thermodynamics is essentially a statement of the conservation of: Energy Charge Momentum Mass 95 / 100The acceleration due to gravity on the surface of the Earth is approximately: 1.6 m/s² 10 m/s² 15 m/s² 9.8 m/s² 96 / 100The rate of change of displacement is called: Speed Velocity Acceleration Momentum 97 / 100A transformer works on the principle of: Both B and C Electromagnetic induction Self-induction Mutual induction 98 / 100Two capacitors of 3 μF and 6 μF are connected in series with a 12 V battery. The charge on the 3 μF capacitor is: 72 μC 12 μC 36 μC 24 μC 99 / 100The SI unit of force is: Pascal Joule Newton Watt 100 / 100The power of a lens is +2 D. Its focal length is: 0.5 m 0.25 m 2.0 m 1.0 m Your score isThe average score is 60% 0% Restart quiz