MCAT / MDCAT Practice Test

Instructions:

• Select the correct option for each question.
• The answers to the following MCQs can be viewed by clicking here. The answer key will open in a separate window.

C. Physics Section

201. A car accelerates uniformly from 10 m/s to 30 m/s in 5 s. The acceleration is:
     A. 2 m/s²
     B. 4 m/s²
     C. 6 m/s²
     D. 8 m/s²
     
     
202. Which physical quantity has both magnitude and direction?
     A. Distance
     B. Speed
     C. Work
     D. Velocity
     
     
203. The area under a force-displacement graph represents:
     A. Momentum
     B. Power
     C. Work done
     D. Acceleration
     
     
204. A body moving in a circular path with constant speed possesses:
     A. Constant velocity
     B. Zero acceleration
     C. Centripetal acceleration
     D. Infinite momentum
     
     
205. The International System unit of impulse is:
     A. Newton
     B. N·s
     C. Joule
     D. Watt
     
     
206. According to Newton’s first law, an object continues its state of rest or motion unless:
     A. Gravity acts
     B. Friction disappears
     C. An external force acts
     D. Momentum increases
     
     
207. If the mass of a body is doubled and velocity is halved, its momentum becomes:
     A. Half
     B. Double
     C. Unchanged
     D. Four times
     
     
208. The acceleration due to gravity on the Moon is nearly:
     A. 9.8 m/s²
     B. 4.9 m/s²
     C. 1.6 m/s²
     D. 0.98 m/s²
     
     
209. The dimensional formula of force is:
     A. ML²T⁻²
     B. MLT⁻²
     C. MLT⁻¹
     D. ML⁻¹T⁻²
     
     
210. A projectile reaches maximum height when its:
     A. Horizontal velocity becomes zero
     B. Vertical velocity becomes zero
     C. Acceleration becomes zero
     D. Momentum becomes zero
     
     
211. The work done by a centripetal force is:
     A. Maximum
     B. Minimum
     C. Zero
     D. Infinite
     
     
212. Power is measured in:
     A. Joule
     B. Newton
     C. Watt
     D. Pascal
     
     
213. The efficiency of a machine is always:
     A. Greater than 100%
     B. Equal to 100%
     C. Less than or equal to 100%
     D. Zero
     
     
214. Potential energy depends mainly upon:
     A. Shape
     B. Position
     C. Color
     D. Temperature
     
     
215. The escape velocity from Earth is approximately:
     A. 5 km/s
     B. 7.9 km/s
     C. 11.2 km/s
     D. 15 km/s
     
     
216. Which law explains the motion of planets around the Sun?
     A. Hooke’s law
     B. Kepler’s law
     C. Faraday’s law
     D. Ohm’s law
     
     
217. A satellite revolves around Earth due to:
     A. Magnetic force
     B. Electrostatic force
     C. Gravitational force
     D. Nuclear force
     
     
218. Pressure exerted by a liquid depends upon:
     A. Area only
     B. Depth and density
     C. Shape only
     D. Volume only
     
     
219. Bernoulli’s principle is based on conservation of:
     A. Momentum
     B. Charge
     C. Energy
     D. Mass
     
     
220. The upthrust acting on a body immersed in liquid is equal to:
     A. Weight of liquid displaced
     B. Weight of body
     C. Mass of liquid displaced
     D. Density of liquid
     
     
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