Presentation on theme: "M13/4/PHYSI/SPM/ENG/TZ1/XX"— Presentation transcript:
1M13/4/PHYSI/SPM/ENG/TZ1/XX PhysicsStandard levelPaper 1Monday 6 May 2013 (morning)45 minutes
2M13/TZ11. The mass of an elephant is 104 kg. The mass of a mouse is 10–2 kg.What is the ratio mass of the elephant?mass of the elephant mass of the mouse ?A. 10–8B. 10–6C. 106D. 108C2. An archer aims five arrows at the centre of a target. The arrows strike the target as shown below. Which of the following describes the aim of the archer?A. Accurate and preciseB. Accurate but not preciseC. Precise but not accurateD. Neither accurate nor preciseC
3M13/TZ13. The graph below shows how velocity v varies with time t for a ball thrown vertically upwards from the Earth’s surface.The shaded area is equal to theA. displacement.B. final velocity.C. change in velocity.D. acceleration.A4. Two identical balls are dropped from a tall building, one a few seconds after the other. Air resistance is not negligible. As the balls fall, the distance between the balls willA. decrease.B. increase.C. increase then remain constant.D. remain constant.No air resistancey = 5 t2when a = 0y = v tv is terminal speedtimedistance1 s5 m2 s20 m3 s45 m4 s80 mC
4M13/TZ15. Which of the following is always true for an object moving in a straight line at constant speed?A. No forces act on the object.B. No resultant force acts on the object.C. The momentum of the object is zero.D. No work is being done on the object.moving in a straight line at constant speed→ constant velocityTranslational equilibrium: 𝑣 is const.→ 𝑎 =0 → 𝐹 𝑛𝑒𝑡 =0B6. A person of weight 600 N is standing on a weighing scale in a lift (elevator). The lift is accelerating upwards at 1.0 m s–2. Which of the following is the reading on the scale?A. 0 NB. 540 NC. 600 ND. 660 NFnet = maFn – 600 = 60Fn = 660 ND
5M13/TZ1 7. A spaceship is moving at constant speed in outer space. An internal explosion causes it to break into two pieces that move in opposite directions.Which of the following best describes what happens to its total momentumand total kinetic energy as a result of the explosion?Total momentumTotal kinetic energyA.unchangedB.increasedC.D.Momentum is conserved as the system is isolated.Kinetic energy obviously increases as the result of internal explosion.B
6M13/TZ18. A horizontal disc is rotating about a vertical axis through its centre. Points P and Q onthe disc are at distances R and 2R respectively from the centre.The acceleration at P is a. Which of the following is the acceleration at Q?A. 0.5aB. aC. 2aD. 4a𝑎 𝑐 = 𝑣 2 𝑅𝑃: 𝑎 𝑐 = 𝑣 2 𝑟 = 2𝜋𝑅 𝑇 2 𝑅 = 4 𝜋 2 𝑅 𝑇 2𝑄: 𝑎 𝑐 = 𝑣 2 𝑟 = 2𝜋2𝑅 𝑇 𝑅 = 8 𝜋 2 𝑅 𝑇 2Ckg of water at 100 °C is mixed with 1.0 kg of water at 0 °C in a container insulatedfrom the surroundings. Which of the following is the final temperature of the water?A. 20 °CB. 25 °CC. 75 °CD. 80 °CThermal energy given by hot water = thermal energy received by cold waterm1 c1 (100 – T) = m2 c2 (T – 0)c1 = c24.0 (100 – T) = 1.0 T ⟹ 400 – 4 T = TD
710. Which of the following best describes the evaporation of a liquid? M13/TZ110. Which of the following best describes the evaporation of a liquid?Location of processTemperature at which process can occurA.at surfaceat any temperature of liquidB.at maximum liquid temperature onlyC.throughout liquidD.A11. Which of the following is the temperature of an object related to?A. The kinetic energy of the objectB. The random kinetic energy of the particles in the objectC. The potential energy of the particles in the objectD. The sum of the random kinetic energy and potential energy of the particles in the objectB
812. The acceleration of an object executing simple harmonic motion is proportional to the A. displacement of the object from equilibrium.B. velocity of the object.C. amplitude of oscillation.D. frequency of oscillation.M13/TZ1ASimple Harmonic Motion is periodic motion in which the acceleration/ restoring force is proportional to and in opposite direction of the displacement.𝑎=− 𝜔 2 𝑥 𝐹=− 𝑚𝜔 2 𝑥𝜔 𝑖𝑠 𝑎𝑛𝑔𝑢𝑙𝑎𝑟 𝑓𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦= 2𝜋 𝑇13. A system, consisting of a mass M connected to a spring, oscillates on a frictionless surfacewith simple harmonic motion between two points, X and Y. Point O is the centre of theoscillation.For the system, at which of the following points is the elastic potential energy equal to thekinetic energy?A. O onlyB. X and Y onlyC. O, X and YD. Neither O, X nor Yv = ± ω (x02 – x2)1/ →D
9M13/TZ114. Microwave ovens cause the water molecules in food to resonate. Water molecules havea natural frequency of vibration f . In order to heat the food most effectively, the frequencyof the microwaves should have a valueA. less than f .B. equal to f .C. greater than f .D. as large as possible.Natural frequency is the frequency an object will vibrate with after an external disturbance.Bresonance: The increase in amplitude of oscillation of a system exposed to a periodic driving force with a frequency equal to the natural frequency of the system.If the frequency of a driving force matches the natural frequency of the system, this leads to a better absorption of energy by the system, resulting in large amplitude oscillations.
10M13/TZ115. Gas particles are equally spaced along a straight line. A sound wave passesthrough the gas. The positions of the gas particles at one instant are shown below.Which of the distances shown is equal to the wavelength of the wave?BWavelength λ: the distance, measured in the direction of propagation of a wave,between two successive points with the same phase of oscillation.16. A particle with positive charge +q moves freely from one plate held at potential V1to another plate held at potential V2.Which of the following is the electric potential energy lost by the charge?A. qV1B. qV2C. q (V1 +V2 )D. q (V1 – V2 )∆𝑈=𝑞∆𝑉D
11M13/TZ1 𝑅= 𝑉 𝐼 by definition 17. Which of the following graphs shows the relationship between current I andvoltage V for a filament lamp?𝑅= 𝑉 𝐼 by definitionFilament does not obey Ohm’s law becauseratio voltage to current is not constant.We say tungsten is “non-ohmic”It’s resistance increases as current through it increases, because temperature increases.D
12A voltmeter is connected across one of the lamps. M13/TZ118. A cell of negligible internal resistance is connected to three identical lamps.A voltmeter is connected across one of the lamps.If the filament in lamp X breaks, the reading on the voltmeter willA. become zero.B. decrease.C. stay the same.D. increase.BV = IRR doesn’t changeCurrent in the circuit flowing through resistor will be smaller if X breaks, because resistance of the parallel connection will increase, so will total resistance of the circuit, what results in smaller current.
13M13/TZ119. The gravitational field strength at the surface of a certain planet is g. Which of thefollowing is the gravitational field strength at the surface of a planet with twicethe radius and twice the mass?A. 𝑔 2B. gC. 2gD. 4gAForce between planet (mass M) and object of mass m is weight of that object. So𝑚𝑔=𝐺 𝑀𝑚 𝑅 2R – distance between center of the planet and object m = radius of the planet.𝑔=𝐺 𝑀 𝑅 → 𝑔 𝑛𝑒𝑤 =𝐺 2𝑀 (2𝑅) 2 = 𝑔 2
14M13/TZ120. Two point charges of size +2q and –q are placed as shown below. In which of the regions I, II and III can the resultant electric field strength be zero?A. I onlyB. II onlyC. III onlyD. I and III onlyIn region I electric field due to (+2q) is to the left and electric field due to (–q) is to the right, but one due to (+2q) is always greater then the other one.In region II both electric fields are to the rightIn region III electric field due to (+2q) is to the right and electric field due to (–q) is to the left, and there is the point at which the are equal in magnitude but in opposite direction resulting in zero resultant electric field.C
1521. A wire is placed in a magnetic field which is directed to the right. The wire carries a current directed into the page. Which of the following is the direction of theforce on the wire?M13/TZ1DR-H-R 1: The direction of the magnetic force on a charge/current is given by the right-hand rule 1Outstretch fingers in the direction of v (or current I).Curl fingers as if rotating vector v (I ) into vector B.Magnetic force on a positive charge (or I) is in the direction of the thumbMagnetic force on a negative charge points in opposite direction..
16A. Placing the sample in a lead container M13/TZ122. Which of the following would decrease the initial activity of a sample of plutonium?A. Placing the sample in a lead containerB. Placing the sample in a dark roomC. Decreasing the mass of the sampleD. Decreasing the temperature of the sampleC
17What is the activity after 6 days? A. 2 Bq B. 3 Bq C. 4 Bq D. 6 Bq M13/TZ123. A radioactive sample of initial activity 12 Bq has a half-life of 3 days.What is the activity after 6 days?A. 2 BqB. 3 BqC. 4 BqD. 6 BqBAfter 3 days activity is half of the initial one = 6 BqAfter next 3 days activity is half of that one = 3 Bq24. The reaction is an example ofA. alpha decay.B. artificial transmutation.C. nuclear fusion.D. proton decay.B
18What is the efficiency of the car? A. 30 % B. 40 % C. 70 % D. 100 % M13/TZ125. The diagram below shows an energy flow diagram (Sankey diagram) for a car.What is the efficiency of the car?A. 30 %B. 40 %C. 70 %D. 100 %A𝑒𝑓𝑓= 𝑢𝑠𝑒𝑓𝑢𝑙 𝑜𝑢𝑡𝑝𝑢𝑡 𝑖𝑛𝑝𝑢𝑡 = 30𝑘𝐽 100𝑘𝐽
19𝑀𝑊= 𝑀𝐽 1𝑠 → 𝑜𝑢𝑡𝑝𝑢𝑡=0.25 30 𝑀𝐽 𝑘𝑔 −1 50 𝑘𝑔/𝑠 M13/TZ126. A small biofuel power station burns ethanol with an overall efficiency of 25 %.The energy density of ethanol is 30 MJ kg–1. The mass of fuel consumed everysecond is 50 kg. Which of the following gives the useful power output in MW?A𝑀𝑊= 𝑀𝐽 1𝑠 → 𝑜𝑢𝑡𝑝𝑢𝑡= 𝑀𝐽 𝑘𝑔 − 𝑘𝑔/𝑠= (30×50) 𝑀𝐽 𝑘𝑔 −1 𝑘𝑔 𝑠= 25×30× 𝑀𝐽 𝑠
20M13/TZ127. An oscillating water column ocean-wave energy converter produces power Pfrom waves of a certain amplitude and wavespeed. Which of the following wouldbe the power produced from waves of twice the amplitude and twice the wavespeed?A. 2PB. 4PC. 8PD. 16PWave power: P/Lamplitude of the wave A,length of wavefront L, - density of waterC
21M13/TZ128. The total power radiated by the Sun is P. The distance from the Sun to the Earth is d.The albedo of the Earth is α . What is the power absorbed by each square metre ofthe Earth’s surface?𝛼= 𝑡𝑜𝑡𝑎𝑙 𝑟𝑒𝑓𝑙𝑒𝑐𝑡𝑒𝑑 𝑠𝑐𝑎𝑡𝑒𝑟𝑟𝑒𝑑 𝑝𝑜𝑤𝑒𝑟 𝑡𝑜𝑡𝑎𝑙 𝑖𝑛𝑐𝑖𝑑𝑒𝑛𝑡 𝑝𝑜𝑤𝑒𝑟𝐼𝑛𝑡𝑒𝑛𝑠𝑖𝑡𝑦: 𝐼= 𝑃 4𝜋 𝑑 2𝐴𝑝𝑝𝑎𝑟𝑒𝑛𝑡 𝑏𝑟𝑖𝑔ℎ𝑡𝑛𝑒𝑠𝑠: 𝑏= 𝑃 4𝜋 𝑑 2D𝛼= 𝑠𝑐𝑎𝑡𝑒𝑟𝑟𝑒𝑑 𝑖𝑛𝑡𝑒𝑛𝑠𝑖𝑡𝑦 𝑡𝑜𝑡𝑎𝑙 𝑖𝑛𝑐𝑖𝑑𝑒𝑛𝑡 𝑖𝑛𝑡𝑒𝑛𝑠𝑖𝑡𝑦Intensity scattered = 𝛼 (total incident intensity)Intensity absorbed= total incident intensity – Intensity scattered= total incident intensity – 𝛼 (total incident intensity )
22M13/TZ1 29. Carbon dioxide is a greenhouse gas because A. it absorbs infrared light radiated by the Sun.B. it absorbs ultraviolet light radiated by the Earth.C. its natural frequency molecular oscillation lies in the infrared region.D. its natural frequency molecular oscillation lies in the ultraviolet region.M13/TZ1CShort wavelength radiation is received from the sun and causes the surface of the Earth to warm up. The Earth will emit infra-red radiation (longer wavelengths than the radiation coming from the sun because the Earth is cooler than the sun). Some of this infra-red radiation is absorbed by gases in the atmosphere and re-radiated in all directions. Temperature of the Earth’s surface will be constant if the rate at which it radiates energy equals the rate at which it absorbs energy.The greenhouse effect is the warming of a planet due its atmosphere allowing in ultraviolet radiation from the Sun, but trapping the infrared radiation emitted by the warm Earth.The greenhouse gas has natural frequency of molecular oscillations in the infrared region, so they easily absorb energy in that region.When the frequency of the electric field is near to the natural frequency of an oscillation of the molecule, the amplitude will be high: The molecule absorbed energy from the field. Infrared radiation drives the vibration of the atoms; visible and UV radiation excites the electron cloud. The greenhouse gases like CO2 or several organic gases have natural vibration frequency in the infrared domain. They absorb it very strongly. On the other hand, they are transparent for visible and UV light. So the visible and UV light arrives to the surface of the Earth, and is absorbed by metals, rocks, soil, and the leaves of the vegetation and also by waters. The molecules can re-radiate the absorbed energy, but it is more probable, that they collide with other molecules and excite vibrations. These vibrations emit infrared photons which can not go through the atmosphere, as the greenhouse gases absorb them.
23M13/TZ130. Which of the following is most likely to increase the rate of global warming?A. DeforestationB. Increasing the use of nuclear power stationsC. Increasing the use of renewable energy sourcesD. Using natural gas instead of coal for electricity generationA
24M13/4/PHYSI/SPM/ENG/TZ2/XX PhysicsStandard levelPaper 1Monday 6 May 2013 (afternoon)45 minutes
25electric field strength is not a magnitude M13/TZ2The length of the side of a cube is 10.0 ±0.3 cm.What is the uncertainty in the volume of the cube?A. ±0.027 cm3B. ±2.7 cm3C. ±9.0 cm3D. ±90 cm3∆𝑉 𝑉 = ∆𝑎 𝑎 + ∆𝑎 𝑎 + ∆𝑎 𝑎 =3 ∆𝑎 𝑎D∆𝑉=3 𝑎 2 ∆𝑎=90 𝑐𝑚 32. Which of the following lists three vector quantities?A. momentum, electric field strength, displacementB. momentum, displacement, pressureC. pressure, electric current, displacementD. electric current, electric field strength, impulseAelectric field strength is not a magnitudeIt is the whole vector
263. An object, initially at rest, travels a distance d in a time t at a constant acceleration. What is the time taken for the object to travel 16d from rest at the same acceleration?A. 16tB. 8tC. 4tD. 2tM13/TZ2𝑑= 𝑎 2 𝑡 → 𝑑= 𝑎 2 (4𝑡) 2C4. An object is released above the surface of Earth. Which of the following correctlydescribes the speed and acceleration before it reaches terminal speed?Speed AccelerationA increases remains constantB increases decreasesC remains constant remains constantD remains constant decreasesBAir resistance provides a drag force to objects in free fall.▪ The drag force increases as the speed of the fallingobject increases resulting in decreasing downward acceleration▪ Although acceleration decreases, the speed still increases▪ When the drag force reaches the magnitude of the gravitationalforce, the falling object will stop accelerating and fall at aconstant velocity. This is called the terminal velocity/speed.
27M13/TZ25. An object of mass m is connected via a frictionless pulley to an object of mass M,where M > m. M rests on a horizontal frictionless surface.What is the acceleration of the system?𝐹 𝑛𝑒𝑡 =𝑚 𝑎T = Mamg - T = mamg - Ma = maa(M+m)=mgA
28M13/TZ26. The graph shows the variation with distance x of the magnitude ofthe net force F acting on a body initially at rest.Which of the following describes how the kinetic energy and the accelerationof the body change with distance?Kinetic energy AccelerationA. decrease decreaseB. decrease increaseC. increase decreaseD. increase increase1. ∆ KE = Wnet work done on an object will result in the change of kinetic energy(work is the area under the graph F vs. x)2. As net F decreases, so does accelerationC
29M13/TZ27. A ball of mass 0.40 kg travels horizontally and strikes a vertical wall witha speed of 5.0 m s–1. It rebounds horizontally with a speed of 3.0 m s–1.The ball is in contact with the wall for a time of 0.20 s.What is the average magnitude of the force exerted by the ball on the wall?A NB NC. 4 ND. 16 NF ∆t = ∆ p = pfinal – pinitial = m(vfinal – vinitial)▪ we can choose coordinate system (vectors !!!)positive left or positive right▪ as the force is positive we want final direction tobe positive, so we choose left to be positive▪ Then F (0.2) = 0.40 [3.0 – (–5.0)] = 3.2▪ F = 3.2/0.2 = 16 N (positive means to the left)D
30M13/TZ2A car on a road follows a horizontal circular path at constant speed. Which of thefollowing correctly identifies the origin and the direction of the net force on the car?Origin DirectionA. car engine toward centre of circleB. car engine away from centre of circleC. friction between car tyres and road away from centre of circleD. friction between car tyres and road toward centre of circleDNewton’s first law of motion – the law of inertia ... objects in motion tend to stay in motion with the same speed and the same direction unless acted upon by a net force.Whatever the object, if it moves in a circle, there is some force acting upon it to cause it to deviate from its straight-line path, accelerate inwards and move along a circular path.For object's moving in circular motion, there is a net force acting towards the center which causes the object to seek the center.
31M13/TZ29. The temperature of an object is −153°C. Its temperature is raised to 273°C.What is the temperature change of the object?A. 699 KB. 426 KC. 153 KD. 120 KB
32M13/TZ210. Two ideal gases X and Y are at the same temperature. The mass of the molecules ofgas X is twice the mass of the molecules of gas Y.Microscopic level: (absolute) temperature directly proportional to the average kinetic energy of the molecules of a substance:(KE)avg = 𝑘𝑇k is Boltzmann constantB1 2 𝑚 𝑣 2 𝑎𝑣𝑔 ~ 𝑇1 2 𝑚 𝑥 𝑣 2 𝑥 𝑎𝑣𝑔 𝑚 𝑦 𝑣 2 𝑦 𝑎𝑣𝑔 = 𝑇 𝑇𝑣 2 𝑥 𝑎𝑣𝑔 𝑣 2 𝑦 𝑎𝑣𝑔 = 𝑚 𝑦 𝑚 𝑥 = 1 2
33M13/TZ211. A sample contains 4 g of helium and 20 g of neon. The mass number of helium is 4and the mass number of neon is 20.What is the ratio number of atoms of neon number of atoms of helium ?A. 0.2B. 1C. 5D. 80BAvogadro’s number:Number of constituent particles (atoms/molecules) per mole of a given substance is 6.022×1023 mol−1
34M13/TZ212. Which graph shows how velocity v varies with displacement x of a system movingwith simple harmonic motion?ABe aware:Dependence on t:v = – x0 sin ωt = – v0 sin ωtDependence on x:v = ± x 0 2 − x 2at x = x0 & x = – x v = 0at x = v = ± x0D. Is tempting. but D. is sinusoidal, it would show dependence on time not x.
35M13/TZ213. An object undergoes simple harmonic motion with time period T and amplitude 0.5 m.At time t = 0 s the displacement of the object is a maximum.What is the displacement of the object at time t = 3𝑇 4 ?A. − 0.50 mB mC mD. 0 mEvery 𝑇 4 oscillator covers distance of one amplitudeD
36M13/TZ214. Light of wavelength 600 nm travels from air to glass at normal incidence. The refractive index of the glass is 1.5. The speed of light in air is c. Which of the following correctly identifies the speed of the waves and their wavelength in the glass?𝑛= 𝑐 𝑣 → 𝑣= 𝑐 𝑛 = 2𝑐 3𝑓𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦 𝑑𝑜𝑒𝑠 𝑛 ′ 𝑡 𝑐ℎ𝑎𝑛𝑔𝑒 𝑤ℎ𝑒𝑛 𝑤𝑎𝑣𝑒 𝑐ℎ𝑎𝑛𝑔𝑒𝑠 𝑚𝑒𝑑𝑖𝑢𝑚𝑐=𝑛𝑣 𝑓 λ 𝑎𝑖𝑟 =𝑛𝑓 λ 𝑔𝑙𝑎𝑠𝑠λ 𝑔𝑙𝑎𝑠𝑠 = λ 𝑎𝑖𝑟 /𝑛D
37M13/TZ215. Which of the following correctly describes the direction of a ray drawn relativeto a wavefront for longitudinal and transverse waves?Longitudinal wave Transverse waveA parallel parallelB parallel perpendicularC perpendicular parallelD perpendicular perpendicularD
4018. A proton is accelerated from rest through a potential difference of 1000 V. What is the potential difference through which an alpha particle must be accelerated to gain thesame kinetic energy as the accelerated proton?A VB VC. 500 VD. 250 VM13/TZ2∆𝑈=𝑞∆𝑉=∆𝐾𝐸𝑞 𝑝𝑟𝑜𝑡𝑜𝑛 ∆𝑉 𝑝𝑟𝑜𝑡𝑜𝑛 = 𝑞 𝑎𝑙𝑝ℎ𝑎 ∆𝑉 𝑎𝑙𝑝ℎ𝑎C19. The magnitude of the gravitational field strength at the surface of a planet of mass M andradius R is g. What is the magnitude of the gravitational field strength at the surface of a planetof mass 2M and radius 2R?A. 𝑔 4B. 𝑔 2C. gD. 2gForce between planet (mass M) and object of mass m is weight of that object. So𝑚𝑔=𝐺 𝑀𝑚 𝑅 2R – distance between center of the planet and object m = radius of the planet.𝑔=𝐺 𝑀 𝑅 → 𝑔 𝑛𝑒𝑤 =𝐺 2𝑀 (2𝑅) 2 = 𝑔 2B
4120. Three positive point charges +Q are fixed in position at the vertices of an isosceles triangle. P is the mid point between two of the charges.M13/TZ2The only electric field that survives at point P is the one due to charge at the right angle corner. The other two cancel each other out.Which arrow correctly identifies the direction of the electric field at point P?A. WB. XC. YD. ZB
42M13/TZ221. Three wires, P, Q and R, carry equal currents directed into the plane of the paper.Currents in same direction attract!Currents in opposite direction repel!Which arrow correctly identifies the direction of the magnetic force on wire P?A. WB. XC. YD. ZB
4322. Which particle is acted on by both the strong nuclear force and the Coulomb force? A. AntineutrinoB. ElectronC. NeutronD. ProtonM13/TZ2D23. A nucleus of californium (Cf) contains 98 protons and 154 neutrons. Which of thefollowing correctly identifies this nucleus of californium?C
4424. Which of the following gives the particles of the same energy in an increasing order of ionizing ability?A. β, α, γB. α, β, γC. γ, α, βD. γ, β, αM13/TZ2D25. The use of which energy source enhances the greenhouse effect the most?A. WoodB. CoalC. WindD. TidalB
4526. The volume expansion coefficient of water is γ 26. The volume expansion coefficient of water is γ . The average depth of the ocean is h.What is the expected fractional increase ∆ℎ ℎ in the sea level for a temperatureincrease of Δθ ?A. γ Δθ hB. γ ΔθC. γ h ΔθD. γ ΔθM13/TZ2𝛾= ∆𝑉 𝑉 0 ∆𝜃 (K−1 or oC−1)γ-coefficient of volume expansion∆𝜃 increase in temp.coefficient of volume expansion= change in volume per unit volume per degree𝛾= 𝑙𝑒𝑛𝑔𝑡ℎ×𝑤𝑖𝑑𝑡ℎ×∆ℎ (𝑙𝑒𝑛𝑔𝑡ℎ×𝑤𝑖𝑑𝑡ℎ×ℎ) ∆𝜃 = ∆ℎ ℎ∆𝜃B
46M13/TZ227. Which of the following correctly describes the energy transformation withinphotovoltaic cells and within solar heating panels?Photovoltaic cells Solar heating panelsA. solar to thermal solar to electricalB. solar to thermal solar to thermalC. solar to electrical solar to electricalD. solar to electrical solar to thermalD
47M13/TZ228. An oscillating water column (OWC) ocean-wave converter produces a power P.What is the power output of this converter if the amplitude and speed of the wavesare both doubled?A. 2PB. 4PC. 8PD. 16PWave power: P/LA - amplitude of the wave,L - length of wavefront - density of waterC
48M13/TZ2 29. The graph shows the spectrum of a black-body. Which graph shows the spectrum of a body of emissivity 0.5 at the same temperature as the black-body? (The original graph is shown dotted.)C
49M13/TZ230. A student states that the following factors may lead to global warmingI. decreased albedo of the Earth’s surfaceII. increase in volcanic activityIII. deforestation.Which of the above statements are correct?A. I and II onlyB. II and III onlyC. I and III onlyD. I, II and IIID
50N13/4/PHYSI/SPM/ENG/NOV/XX PhysicsStandard levelPaper 1Wednesday 6 November 2013 (morning)45 minutes
51N13/NOV1. The sides of a square are measured to be 5.0 ± 0.2 cm. Which of the following givesthe area of the square and its uncertainty?A ± 0.2 cm2B ± 0.4 cm2C. 25 ± 2 cm2D. 25 ± 4 cm2𝑎𝑟𝑒𝑎= 𝑎 2 =25 𝑐𝑚 2 (2𝑆𝐹)C∆𝑎𝑟𝑒𝑎 𝑎𝑟𝑒𝑎 = ∆𝑎 𝑎 + ∆𝑎 𝑎 =2 ∆𝑎 𝑎∆𝑎𝑟𝑒𝑎=2𝑎∆𝑎= 𝑐𝑚 2 =2 𝑐𝑚 2Uncertainties are rounded to one digit2. Which of the following lists two vector quantities and one scalar quantity?A. force, mass, timeB. acceleration, energy, momentumC. distance, impulse, powerD. density, pressure, temperatureB
52N13/NOV3. A tennis ball is dropped from the top of a high building. Air resistance cannot beneglected.Which graph represents the variation with time t of the magnitude of the accelerationa of the ball before it hits the ground?B
53N13/NOVTerminal speed – When air resistance is taken into account object in free fall will not accelerate forever. Air resistance depends on the speed of the object. As speed increases, so does air resistance until it reaches the value equal to the weight of the object. At that time net force is zero, so is acceleration. The speed doesn’t change any more. It is constant speed.
54N13/NOV4. A model plane flies with constant velocity at constant height. Which diagram representsthe forces acting on the plane?DObject is in translational equilibrium if velocity is const.
555. The net force on a body is F. The impulse of F is equal to the A. change in momentum of the body.B. rate of change of momentum of the body.C. change of kinetic energy of the body.D. change of total energy of the body.N13/NOVAImpulse is defined as the product of the net force acting on an object and time interval of action: FΔt vector! (Ns)Impulse F∆t acting on an object will produce the change of its momentum Δp:F∆t = ∆p Δp = mv - mu Ns = kg m/sNewton’s second law::
56N13/NOV 6. In an inelastic collision A. momentum and kinetic energy are both conserved.B. momentum is conserved but kinetic energy is not.C. kinetic energy is conserved but momentum is not.D. neither momentum nor kinetic energy are conserved.B
57N13/NOV7. A force which increases uniformly from 0 to a maximum value of F is applied to an object.The object does not move until the force exceeds 0.5F. As the force increases from0.5F to F the object moves a distance x in the direction of the force. What is the workdone by this force?A. 0.25FxB. 0.5FxC. 0.75FxD. FxforceF0.5 FxCdistanceWork is the area under F vs distance graph
58Speed is constant and is circumference/period N13/NOV8. A body moves with uniform speed around a circle of radius r. The period of themotion is T. What is the speed of the body?A𝑣𝑒𝑐𝑜𝑐𝑖𝑡𝑦 𝑖𝑠 𝑡𝑎𝑛𝑔𝑒𝑛𝑡𝑖𝑎𝑙 𝑡𝑜 𝑡ℎ𝑒 𝑐𝑖𝑟𝑐𝑙𝑒Average velocity is zero, because displacement is zeroSpeed is constant and is circumference/period
59N13/NOV 9. Molar mass is defined as A. the number of particles in one mole of a substance.B. 1/12 the mass of one atom of carbon-12.C. the mass of one mole of a substance.D. the number of particles in 1/12 of a mole of carbon-12.C10. Which of the following is true about boiling and evaporation?Boiling EvaporationA. occurs throughout liquid occurs at liquid surfaceB. occurs throughout liquid occurs throughout liquidC. occurs at liquid surface occurs at liquid surfaceD. occurs at liquid surface occurs throughout liquidA
60N13/NOV11. A solid of mass m is initially at temperature ΔT below its melting point. The solid hasspecific heat capacity c and specific latent heat of fusion L. How much thermal energymust be transferred to the solid in order to melt it completely?A. mL + mcB. mc + mLΔTC. mcΔT + LΔTD. mcΔT + mLTo bring solid to melting point Q = mc∆T is needed.And then Q = mL is needed to melt itD
61N13/NOV12. For a body undergoing simple harmonic motion the velocity and acceleration areA. always in the same direction.B. always in opposite directions.C. in the same direction for a quarter of the period.D. in the same direction for half the period.D
62N13/NOV13. Which graph of displacement x against time t represents the motion ofa critically damped body?ACritical/heavy damping: occurs if the resistive force is so big that the system returns to its equilibrium position without passing through it. The mass comes to rest at its equilibrium position without oscillating. The friction forces acting are such that they prevent oscillations.
63N13/NOV14. Which of the following correctly relates the direction of oscillation of the particles ina medium to the direction of energy propagation for transverse and longitudinal waves?Transverse wave Longitudinal waveA. perpendicular perpendicularB. perpendicular parallelC. parallel perpendicularD. parallel parallelB
6415. Which of the following relates the amplitude A of a travelling wave to the intensity I ? N13/NOV𝐼= 𝑃 4𝜋 𝑑 𝑑 𝑖𝑠 𝑡ℎ𝑒 𝑑𝑖𝑠𝑡𝑎𝑛𝑐𝑒 𝑓𝑟𝑜𝑚 𝑡ℎ𝑒 𝑠𝑜𝑢𝑟𝑐𝑒 𝑜𝑓 𝑝𝑜𝑤𝑒𝑟𝑎𝑝𝑝𝑎𝑟𝑒𝑛𝑡 𝑏𝑟𝑖𝑔ℎ𝑡𝑛𝑒𝑠𝑠:𝑏= 𝐿 4𝜋 𝑑 2C𝐸~ 𝐴 𝑎𝑛𝑑 𝐸= 𝑃 𝑡 → 𝐼~ 𝐴 216. Two identical waves of wavelength λ leave two sources in phase. The waves meet andsuperpose after travelling different distances. Which path difference will result indestructive interference?B
6517. A resistor X of resistance R is made of wire of length L and cross-sectional area A.Resistor Y is made of the same material but has a length 4L and a cross-sectional area 2A.X and Y are connected in series. What is the total resistance of the combination?A. 1.5RB. 2RC. 3RD. 9RN13/NOV𝑅 𝑇𝑂𝑇 =𝜌 𝐿 𝐴 +𝜌 4𝐿 2𝐴 𝑅+2𝑅C
66If intensity of light decreases, RL increases, and VOUT increases N13/NOV18. A light dependent resistor L is connected in series with a cell C and a fixed resistor R.The cell has a negligible internal resistance. VOUT is the output voltage across L.A photoresistor or light-dependent resistor (LDR) or photocell is a light-controlled variable resistor. The resistance of a photoresistor decreases with increasing incident light intensity; in other words, it exhibits photoconductivity. A photoresistor can be applied in light-sensitive detector circuits, and light- and dark-activated switching circuits.𝑉 𝑂𝑈𝑇 =𝐼 𝑅 𝐿 = 𝑒𝑚𝑓 𝑅+ 𝑅 𝐿 𝑅 𝐿 = 𝑒𝑚𝑓 𝑅 𝑅 𝐿 +1If intensity of light decreases, RL increases, and VOUT increasesWhich change will increase VOUT?A. Connect another resistor in parallel with LB. Decrease the intensity of light on LC. Increase the resistance of RD. Decrease the emf of CB
67N13/NOV19. Each of the resistors in the circuit has a resistance of 2.0 Ω. The cell has an emf of 3.0 Vand negligible internal resistance. The ammeter has negligible resistance.1/RTOT = 1/R + 1/3R = 4/3R RTOT = 3/2 ΩI = emf/RTOT = 2 ACurrent through one resistor I1Current through three resistors I32 = I1 + I3R I1 = 3R I3I1 = 3I3I3 = 0.5 AI1 = 1.5 AWhat is the ammeter reading?A. 0.4 AB. 0.5 AC. 1.5 AD. 2.0 AC
68N13/NOV20. Which diagram represents the pattern of electric field lines of two small positive pointcharges held at the positions shown?B
69N13/NOV21. The force F between particles in gravitational and electric fields is relatedto the separation r of the particles by an equation of the form𝐹=𝑎 𝑏𝑐 𝑟 2Which of the following identifies the units for the quantities a, b and c for a gravitational field?a b and cA. N m2 C–2 CB. N m2 C–2 kgC. N m2 kg–2 CD. N m2 kg–2 kgBoth A and D will result in the product (abc) = N m2 , but the problem asks about gravitational force, not electric one.D
7022. An electron of mass me and charge e accelerates between two plates separated by a distance s in a vacuum. The potential difference between the plates is V.N13/NOV𝑑𝑒𝑓𝑖𝑛𝑖𝑡𝑖𝑜𝑛 𝑜𝑓 𝑒𝑙𝑒𝑐𝑡𝑟𝑖𝑐 𝑓𝑖𝑒𝑙𝑑:𝐸= 𝐹 𝑞 𝐸 =𝑁/𝐶𝐸= ∆𝑉 𝑠 𝐸 = 𝑉 𝑚 𝒄𝒐𝒏𝒔𝒕. 𝑬What is the acceleration of the electron?𝑎= 𝐹 𝑚 𝑒 = 𝑒𝐸 𝑚 𝑒 = 𝑒 𝑉−0 𝑠 𝑚 𝑒 = 𝑒𝑉 𝑚 𝑒 𝑠C
71N13/NOV23. In a particular atom, the nucleon number is the total number ofA. protons.B. neutrons.C. electrons.D. protons and neutrons.D24. For which quantity can the unit MeV c–2 be used?A. MassB. MomentumC. Kinetic energyD. Binding energyA𝐸=𝑚 𝑐 2𝑚= 𝐸 𝑐 2Unit for mass is unit for energy (MeV) divided by c2
72N13/NOV 25. Uranium-238 forms a nucleus of plutonium-239 as a result ofA. electron capture followed by alpha decay.B. electron capture followed by beta decay.C. neutron capture followed by alpha decay.D. neutron capture followed by two beta decays.D2 protons more means 2 neutrons into 2 protons and two electrons = two beta decays: n → 1 1 p + −1 0 e β − + νThat would leave the same number of nucleons, so one extra neutron must be captured
73N13/NOV26. In the production of electric power, an advantage of using photovoltaic cells ratherthan fossil fuels is that the photovoltaic cellsA. can be effective in any location.B. can be used continuously.C. have low initial set-up costs.D. are more environmentally friendly when in use.D
74N13/NOV27. What is the main role of the control rods and the main role of the moderatorin a thermal fission reactor?Control Rods ModeratorA. decrease neutron speed decrease neutron speedB. decrease neutron speed absorb neutronsC. absorb neutrons decrease neutron speedD. absorb neutrons absorb neutronsCMain energy transformations in a nuclear power station: nuclear energy → thermal energy → mechanical energy → electrical energyThree important components in the design of all nuclear reactors are moderator, control rods and heat exchanger.▪ Moderator is a medium that slows down fast neutrons to make them suitable for reaction (water, graphite, heavy water).▪ Control rods are movable rods that readily absorb neutrons. They can be introduced or removed from reaction chamberin order to control the rate of fission of uranium and plutonium. Made of chemical elements capable of absorbing manyneutrons without fissioning themselves (cadmium, hafnium, boron, etc)▪ Heat exchanger is used to seal off the place where nuclear reactions take place from the rest of the environment.In some nuclear power plants, the steam from the reactor goes through a heat exchanger to convert another loop ofwater to steam, which drives the turbine.The advantage to this design is that the radioactive water/steam never contacts the turbine.
75N13/NOV28. An oscillating water column (OWC) ocean-wave energy converter useswaves to alter the air pressure in a chamber. Which energy resources must have beeninvolved for this method to generate electricity?I. TidesII. WindIII. SolarA. I onlyB. II onlyC. I and II onlyD. II and III onlyIt is wave not tide !!!!D
76N13/NOV29. The surface temperature of a black-body emitter is doubled. By what factor doesthe power emitted by the body increase?A. 32B. 16C. 4D. 2B𝑃=𝜎𝐴 𝑇 𝑖𝑛 𝑎𝑠𝑡𝑟𝑜𝑝ℎ𝑦𝑠𝑖𝑐𝑠=𝑙𝑢𝑚𝑖𝑛𝑜𝑠𝑖𝑡𝑦30. Which option is not a possible solution to reduce the enhanced greenhouse effect?A. Decommission nuclear power plantsB. Replace the use of coal and oil with natural gasC. Use combined heating and power systems (CHP)D. Use hybrid motor vehiclesA