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