MCAT / MDCAT Practice Test
Instructions: Select the correct option for each question.
C. Physics Section
221. Heat travels through vacuum by:
A. Conduction
B. Convection
C. Radiation
D. Diffusion
222. The International System unit of heat capacity is:
A. J/kg°C
B. J/K
C. cal/g°C
D. W/mK
223. Which material is the best conductor of heat?
A. Wood
B. Plastic
C. Copper
D. Rubber
224. During melting, temperature remains constant because heat is used as:
A. Kinetic energy
B. Potential energy
C. Mechanical energy
D. Electrical energy
225. The specific heat capacity of water is high; therefore water:
A. Heats rapidly
B. Cools rapidly
C. Changes temperature slowly
D. Conducts electricity poorly
226. Which law relates pressure and volume of a gas at constant temperature?
A. Charles’s law
B. Boyle’s law
C. Newton’s law
D. Ohm’s law
227. Absolute zero temperature is:
A. −273°C
B. 0°C
C. −100°C
D. 273°C
228. Sound waves are:
A. Electromagnetic transverse waves
B. Mechanical longitudinal waves
C. Stationary waves
D. Polarized waves
229. The phenomenon responsible for echo is:
A. Refraction
B. Reflection
C. Diffraction
D. Interference
230. The speed of sound is greatest in:
A. Air
B. Vacuum
C. Water
D. Steel
231. Resonance occurs when the natural frequency becomes equal to:
A. Zero frequency
B. Applied frequency
C. Infinite frequency
D. Critical frequency
232. Ultrasound waves have frequencies greater than:
A. 200 Hz
B. 2000 Hz
C. 20,000 Hz
D. 200,000 Hz
233. The wavelength of visible light lies approximately between:
A. 10–100 nm
B. 400–700 nm
C. 1–10 mm
D. 700–1000 nm
234. The refractive index of glass is mainly due to change in:
A. Wavelength
B. Speed of light
C. Frequency
D. Amplitude
235. Total internal reflection occurs when light travels:
A. From rarer to denser medium
B. From denser to rarer medium
C. From vacuum to air
D. Through a prism only
236. Optical fibers work on the principle of:
A. Refraction
B. Diffraction
C. Total internal reflection
D. Polarization
237. The focal length of a plane mirror is:
A. Infinite
B. Zero
C. Equal to radius
D. Half of radius
238. A convex lens always forms a virtual image when the object is placed:
A. Beyond 2F
B. At F
C. Between F and lens
D. At infinity
239. Myopia is corrected by using:
A. Convex lens
B. Concave lens
C. Cylindrical lens
D. Bifocal lens
240. Dispersion of white light through a prism occurs because different colors have different:
A. Speeds in air
B. Frequencies in prism
C. Refractive indices
D. Intensities
241. Electric current is measured in:
A. Volt
B. Coulomb
C. Ampere
D. Ohm
242. Ohm’s law is represented by:
A. V = IR
B. P = VI
C. F = ma
D. E = mc²
243. Resistance of a conductor depends upon:
A. Length and area
B. Voltage only
C. Current only
D. Power only
244. The resistance of a metallic conductor increases with:
A. Temperature
B. Pressure
C. Area
D. Density
245. A voltmeter is connected in:
A. Series
B. Parallel
C. Mixed combination
D. None of these
246. Electrical power is given by:
A. V/I
B. VI
C. IR
D. I/R
247. One kilowatt-hour is equal to:
A. 3.6 × 10⁶ J
B. 3600 J
C. 1000 J
D. 3.6 × 10³ J
248. The heating effect of current is based on:
A. Faraday’s law
B. Joule’s law
C. Coulomb’s law
D. Ampere’s law
249. A fuse wire should have:
A. High melting point
B. Low resistance only
C. Low melting point
D. High conductivity only
250. The drift velocity of electrons in a conductor is of the order of:
A. Speed of light
B. Few mm/s
C. 10⁶ m/s
D. 10⁸ m/s
251. Magnetic field lines around a straight conductor are:
A. Straight
B. Circular
C. Elliptical
D. Random
252. The International System unit of magnetic flux is:
A. Tesla
B. Weber
C. Henry
D. Gauss
253. Electromagnetic induction was discovered by:
A. Maxwell
B. Einstein
C. Faraday
D. Rutherford
254. A transformer works on:
A. Electrostatic induction
B. Electromagnetic induction
C. Mutual friction
D. Self-resistance
255. A step-up transformer increases:
A. Current
B. Resistance
C. Voltage
D. Power loss
256. The frequency of AC supply in Pakistan is:
A. 25 Hz
B. 50 Hz
C. 60 Hz
D. 100 Hz
257. Radio waves are used for:
A. Sterilization
B. Medical imaging
C. Communication
D. Heating metals
258. Microwaves are commonly used in:
A. Radar and ovens
B. X-ray imaging
C. Photography
D. Nuclear reactions
259. X-rays have high:
A. Wavelength
B. Frequency
C. Density
D. Pressure
260. Gamma rays are emitted from:
A. Electronic transitions
B. Nuclear transitions
C. Sound vibrations
D. Heat transfer
261. The half-life of a radioactive substance is the time required for:
A. Complete decay
B. Half nuclei to decay
C. Temperature to double
D. Mass to become zero
262. Isotopes have the same:
A. Mass number
B. Number of neutrons
C. Atomic number
D. Density
263. The nucleus of hydrogen contains:
A. One neutron
B. One proton
C. One electron
D. One proton and one neutron
264. The energy of a photon is given by:
A. E = mc²
B. E = hf
C. E = ma
D. E = mv²
265. Einstein explained the photoelectric effect using:
A. Wave theory
B. Photon theory
C. Nuclear theory
D. Relativity only
266. The International System unit of frequency is:
A. Joule
B. Watt
C. Hertz
D. Newton
267. The time period of a simple pendulum depends upon:
A. Mass
B. Length
C. Density
D. Amplitude only
268. In simple harmonic motion, acceleration is always directed:
A. Away from mean position
B. Towards mean position
C. Along velocity
D. Perpendicular to motion
269. The restoring force in SHM is proportional to:
A. Velocity
B. Acceleration
C. Displacement
D. Momentum
270. Which quantity remains constant in uniform circular motion?
A. Velocity
B. Acceleration
C. Speed
D. Force
271. The torque produced by a force depends upon:
A. Mass only
B. Perpendicular distance
C. Volume only
D. Density only
272. Angular momentum is conserved when:
A. External torque is zero
B. Velocity is constant
C. Mass increases
D. Acceleration becomes zero
273. Which instrument is used to measure atmospheric pressure?
A. Hydrometer
B. Thermometer
C. Barometer
D. Lactometer
274. Surface tension is due to:
A. Adhesive forces
B. Cohesive forces
C. Magnetic forces
D. Electrostatic forces
275. Capillary action is mainly due to:
A. Surface tension
B. Gravity
C. Friction
D. Pressure
276. Young’s modulus is related to:
A. Viscosity
B. Elasticity
C. Surface tension
D. Heat
277. Stress is defined as:
A. Force × area
B. Force/area
C. Area/force
D. Mass × acceleration
278. Hooke’s law is valid within:
A. Breaking point
B. Elastic limit
C. Plastic region
D. Yield point
279. Which quantity is scalar?
A. Momentum
B. Torque
C. Speed
D. Displacement
280. The dimensional formula of energy is:
A. ML²T⁻²
B. MLT⁻²
C. MLT⁻¹
D. ML⁻¹T²
281. The International System unit of gravitational constant is:
A. N·m²/kg²
B. N/kg²
C. N²m/kg
D. kg/Nm²
282. The gravitational potential energy near Earth’s surface is:
A. mgh
B. ½mv²
C. Fd
D. ma
283. The center of mass of a uniform ring lies:
A. At circumference
B. At radius
C. At center
D. Outside ring
284. A body in equilibrium has:
A. Zero net force
B. Infinite momentum
C. Constant acceleration
D. Variable velocity
285. The coefficient of friction is:
A. Dimensionless
B. Vector quantity
C. Measured in newton
D. Always greater than 1
286. The Doppler effect occurs due to:
A. Reflection of sound
B. Relative motion between source and observer
C. Interference of waves
D. Diffraction of sound
287. Interference is a characteristic property of:
A. Particles only
B. Waves
C. Solids
D. Liquids
288. Polarization proves that light is:
A. Longitudinal
B. Mechanical
C. Transverse
D. Stationary
289. Diffraction is more prominent when wavelength is:
A. Very small
B. Comparable to obstacle size
C. Zero
D. Infinite
290. The critical angle for water-air interface is approximately:
A. 49°
B. 42°
C. 90°
D. 30°
291. A concave mirror produces a real inverted image when the object is:
A. Between focus and pole
B. At focus
C. Beyond focus
D. At center only
292. The magnifying power of a microscope increases with:
A. Long focal length
B. Short focal length
C. Larger aperture only
D. Lower frequency
293. Semiconductors have electrical conductivity:
A. Greater than conductors
B. Less than insulators
C. Between conductors and insulators
D. Equal to superconductors
294. Silicon and germanium are:
A. Conductors
B. Semiconductors
C. Insulators
D. Superconductors
295. In a p-type semiconductor, majority charge carriers are:
A. Electrons
B. Protons
C. Holes
D. Neutrons
296. The process of adding impurities to a semiconductor is called:
A. Ionization
B. Doping
C. Radiation
D. Polarization
297. A transistor is mainly used for:
A. Heating
B. Amplification
C. Reflection
D. Magnetization
298. The binding energy of a nucleus is due to:
A. Chemical force
B. Nuclear force
C. Electrostatic force only
D. Gravitational force
299. Nuclear fusion is the source of energy in:
A. Nuclear reactors only
B. Electric bulbs
C. The Sun
D. Batteries
300. Which scientist proposed the quantum theory?
A. Newton
B. Rutherford
C. Planck
D. Bohr