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0px"><i class="fa fa-fw"></i><a href="../1366/hl-practice-paper-2.html">HL practice paper 2</a></label></li></ul></div> <div class="hidden-xs hidden-sm"> <button class="btn btn-default btn-block text-xs-center" data-toggle="modal" data-target="#modal-feedback" style="margin-bottom: 10px"><i class="fa fa-send"></i> Feedback</button> </div> </div> <div class="col-md-9" id="main-column"> <h1 class="page_title"> SL practice paper 1 <a href="#" class="mark-page-favorite pull-right" data-pid="1534" title="Mark as favorite" onclick="return false;"><i class="fa fa-star-o"></i></a> </h1> <ol class="breadcrumb"> <li><a href="../../../physics.html"><i class="fa fa-home"></i></a><i class="fa fa-fw fa-chevron-right divider"></i></li><li><a href="../2885/exam-questions.html">Exam questions</a><i class="fa fa-fw fa-chevron-right divider"></i></li><li><span class="gray">SL practice paper 1</span></li> <span class="pull-right" style="color: #555" title="Suggested study time: 20 minutes"><i class="fa fa-clock-o"></i> 20'</span> </ol> <article id="main-article"> <div class="pinkBg"> <p>This is an original paper for you to try. It's a slightly shortened Standard Level Paper 1. The difficulty, language and syllabus coverage is the same but the questions are different. These questions do not appear in the Question Bank so you won't have seen them before. Try to complete the paper in the time allocated then check out the video run through.</p> <ul> <li>25 questions (normally 30)</li> <li>38 minutes (normally 45)</li> <li>No reading time</li> <li>No calculator</li> <li>Use of data booklet is permitted</li> </ul> <p>WARNING: Do not attempt this paper until the revision phase of your course. Make the most of the opportunity.</p> <p style="text-align: center;"><img alt="" src="../../practice-papers/exam-2-1.jpg" style="width: 500px; height: 294px;"></p> </div> <div class="greenBg"> <h4>Paper - try it online</h4> <br><a class="btn btn-primary btn-block text-center" data-toggle="modal" href="#a4ab710c"><i class="fa fa-play"></i> START QUIZ!</a><div class="modal fade modal-slide-quiz" id="a4ab710c"> <div class="modal-dialog" style="width: 95vw; max-width: 960px"> <div class="modal-content"> <div class="modal-header slide-quiz-title"> <h4 class="modal-title" style="width: 100%;"> Practice paper 1 SL <strong class="q-number pull-right"> <span class="counter">1</span>/<span class="total">1</span> </strong> </h4> </div> <div class="modal-body p-xs-3"> <div class="slide-quiz" data-stats="6-450-1534" style="opacity: 0"> <div class="exercise shadow-bottom"><div class="q-question"><p><span new="" roman="" style="font-size:12.0pt;font-family:Calibri;
mso-ascii-theme-font:minor-latin;mso-fareast-font-family:Calibri;mso-fareast-theme-font:
minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:" times="">What is the best estimate for the radius of a hydrogen atom?</span></p></div><div class="q-answer"><p><label class="radio"> <input type="radio"> <span>10<sup>-15</sup> cm</span></label> </p><p><label class="radio"> <input type="radio"> <span>10<sup>-10</sup> cm</span></label> </p><p><label class="radio"> <input class="c" type="radio"> <span>10<sup>-8</sup> cm</span></label> </p><p><label class="radio"> <input type="radio"> <span>10<sup>-13</sup> cm</span></label> </p></div><div class="q-explanation"><p>Remember 10<sup>-10</sup> m and convert to cm</p></div><div class="slide-q-actions"><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="exercise shadow-bottom"><div class="q-question"><p><span new="" roman="" style="font-size:12.0pt;font-family:Calibri;
mso-ascii-theme-font:minor-latin;mso-fareast-font-family:Calibri;mso-fareast-theme-font:
minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:" times="">A motor raises a 10 kg mass at a constant speed of 5 ms<sup>-1</sup>. If the input power is1 kW what is the efficiency of the system?</span></p></div><div class="q-answer"><p><label class="radio"> <input type="radio"> <span>25 %</span></label> </p><p><label class="radio"> <input type="radio"> <span>75 %</span></label> </p><p><label class="radio"> <input type="radio"> <span>100 %</span></label> </p><p><label class="radio"> <input class="c" type="radio"> <span>50 %</span></label> </p></div><div class="q-explanation"><p>power out = Fv = mgv = 500 W</p><p>Eff = Pout/Pin = 500/1000</p></div><div class="slide-q-actions"><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="exercise shadow-bottom"><div class="q-question"><p><span new="" roman="" style="font-size:12.0pt;font-family:Calibri;
mso-ascii-theme-font:minor-latin;mso-fareast-font-family:Calibri;mso-fareast-theme-font:
minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:" times="">3 forces act on a point object causing it to accelerate upwards. Which free-body diagram represents this situation?</span></p><p style="text-align: center;"> </p><p style="text-align: center;"><img alt="" height="250" src="../../picture1.png" width="280"></p></div><div class="q-answer"><p><label class="radio"> <input type="radio"> <span>B</span></label> </p><p><label class="radio"> <input class="c" type="radio"> <span>C</span></label> </p><p><label class="radio"> <input type="radio"> <span>D</span></label> </p><p><label class="radio"> <input type="radio"> <span>A</span></label> </p></div><div class="q-explanation"><p>Resultant force is upwards.</p></div><div class="slide-q-actions"><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="exercise shadow-bottom"><div class="q-question"><p>The graph represents the force applied to an object of mass 20,000 kg.</p><p style="text-align: center;"><img alt="" height="203" src="../../p1q4.png" width="332"></p></div><div class="q-answer"><p><label class="radio"> <input type="radio"> <span>4 ms<sup>-1</sup></span></label> </p><p><label class="radio"> <input type="radio"> <span>16 ms<sup>-1</sup></span></label> </p><p><label class="radio"> <input class="c" type="radio"> <span>2 ms<sup>-1</sup></span></label> </p><p><label class="radio"> <input type="radio"> <span>8 ms<sup>-1</sup></span></label> </p></div><div class="q-explanation"><p>impulse = Area = 4000 x 20/2 = 40,000</p><p>Change in v = impulse / mass</p></div><div class="slide-q-actions"><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="exercise shadow-bottom"><div class="q-question"><p><span new="" roman="" style="font-size:12.0pt;font-family:Calibri;
mso-ascii-theme-font:minor-latin;mso-fareast-font-family:Calibri;mso-fareast-theme-font:
minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:" times="">A ball of mass m is thrown with initial velocity v at angle </span><span new="" roman="" style="font-size:12.0pt;font-family:Symbol;mso-ascii-font-family:
Calibri;mso-ascii-theme-font:minor-latin;mso-fareast-font-family:Calibri;
mso-fareast-theme-font:minor-latin;mso-hansi-font-family:Calibri;mso-hansi-theme-font:
minor-latin;mso-bidi-font-family:" times=""><span style="mso-char-type:
symbol;mso-symbol-font-family:Symbol">q</span></span><span new="" roman="" style="font-size:
12.0pt;font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-fareast-font-family:
Calibri;mso-fareast-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;
mso-bidi-font-family:" times=""> to the horizontal as shown.</span></p><p style="text-align: center;"><img alt="" height="112" src="../../p1q5.png" width="297"></p><p>What is the kinetic energy at F?</p></div><div class="q-answer"><p><label class="radio"> <input class="c" type="radio"> <span>½ m(<span class="scayt-misspell-word" data-scayt-word="vcos" data-wsc-id="k77qqjdjih98pt117" data-wsc-lang="en_US">vcos</span></span></label>)<sup>2</sup> </p><p><label class="radio"> <input type="radio"> <span>½ mv<sup>2</sup></span></label> </p><p><label class="radio"> <input type="radio"> <span>zero</span></label> </p><p><label class="radio"> <input type="radio"> <span>½ m(<span class="scayt-misspell-word" data-scayt-word="vsin" data-wsc-id="k77qqjh7t0zgx4qpb" data-wsc-lang="en_US">vsin</span></span></label>)<sup>2</sup> </p></div><div class="q-explanation"><p>horizontal component of velocity is constant</p></div><div class="slide-q-actions"><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="exercise shadow-bottom"><div class="q-question"><p><span new="" roman="" style="font-size:12.0pt;font-family:Calibri;
mso-ascii-theme-font:minor-latin;mso-fareast-font-family:Calibri;mso-fareast-theme-font:
minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:" times="">A ball starting from rest rolls down a slope with constant acceleration. It is photographed 3 times, at times t= 0 s, t = 1 s and t =2 s.</span></p><p style="text-align: center;"><img alt="" height="107" src="../../p1q6.png" width="308"></p><p>What Is the acceleration of the ball?</p></div><div class="q-answer"><p><label class="radio"> <input type="radio"> <span>4 ms<sup>-2</sup></span></label> </p><p><label class="radio"> <input class="c" type="radio"> <span>2 ms<sup>-2</sup></span></label> </p><p><label class="radio"> <input type="radio"> <span>3 ms<sup>-2</sup></span></label> </p><p><label class="radio"> <input type="radio"> <span>1 ms<sup>-2</sup></span></label> </p></div><div class="q-explanation"><p>use s = 1/2 at<sup>2</sup></p><p>a = 2s/t<sup>2</sup> = 2 x 4 / 2<sup>2</sup></p></div><div class="slide-q-actions"><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="exercise shadow-bottom"><div class="q-question"><p>The two graphs below represent the collision of two balls of equal mass with a wall.</p><p style="text-align: center;"><br><img alt="" height="171" src="../../p1q7.png" width="404"></p><p>If the scales on each graph are the same how is the impulse and force different?</p><p style="text-align: center;">Impulse ----- Force</p></div><div class="q-answer"><p><label class="radio"> <input type="radio"> <span>different---- no difference</span></label> </p><p><label class="radio"> <input type="radio"> <span>no difference---- no difference</span></label> </p><p><label class="radio"> <input class="c" type="radio"> <span>No difference ---- different</span></label> </p><p><label class="radio"> <input type="radio"> <span>different---- different</span></label> </p></div><div class="q-explanation"><p>change in velocity is the same but time is different.</p></div><div class="slide-q-actions"><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="exercise shadow-bottom"><div class="q-question"><p>The graph shows the rise of temperature as a metal cube of mass m is heated.</p><p style="text-align: center;"><img alt="" height="158" src="../../p1q8.png" width="282"></p><p>If the power supplied is P and the gradient of the line k, what is the heat capacity of the metal cube?</p></div><div class="q-answer"><p><label class="radio"> <input type="radio"> <span>P/mk</span></label> </p><p><label class="radio"> <input type="radio"> <span>Pk</span></label> </p><p><label class="radio"> <input type="radio"> <span>Pk/m</span></label> </p><p><label class="radio"> <input class="c" type="radio"> <span>P/k</span></label> </p></div><div class="q-explanation"><p>Q = <span class="scayt-misspell-word" data-scayt-word="CΔT" data-wsc-id="k77qqkl8fya1zrh7s" data-wsc-lang="en_US">CΔT</span></p><p>P/Δt = <span class="scayt-misspell-word" data-scayt-word="CΔT" data-wsc-id="k77qqkok5fvzvq4pe" data-wsc-lang="en_US">CΔT</span>/Δt</p></div><div class="slide-q-actions"><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="exercise shadow-bottom"><div class="q-question"><p>Two gas flasks of equal volume are connected by a narrow tube. Flask P is kept at a temperature of 200 K and flask Q at 600 K.</p><p style="text-align: center;"><img alt="" height="136" src="../../p1q9.png" width="182"></p><p>What is the ratio</p><p style="text-align: center;"><span class="math-tex">\({number \ of \ moles\ in \ P\over number \ of \ moles\ in \ Q}\)</span></p></div><div class="q-answer"><p><label class="radio"> <input type="radio"> <span>2</span></label> </p><p><label class="radio"> <input type="radio"> <span>1/3</span></label> </p><p><label class="radio"> <input class="c" type="radio"> <span>3</span></label> </p><p><label class="radio"> <input type="radio"> <span>1</span></label> </p></div><div class="q-explanation"><p>Same pressure and volume so nT = constant</p><p>n is proportional to 1/T</p><p>n<sub>P</sub>/n<sub>Q</sub> = T<sub>Q</sub>/T<sub>P</sub></p></div><div class="slide-q-actions"><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="exercise shadow-bottom"><div class="q-question"><p><span new="" roman="" style="font-size:12.0pt;font-family:Calibri;
mso-ascii-theme-font:minor-latin;mso-fareast-font-family:Calibri;mso-fareast-theme-font:
minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:" times="">Sound travels from A to B by two paths, one direct 680 m through cold air near the ground and the other 20m longer as it refracts through layers of warm air. Each sound arrives at the same time.</span></p><p style="text-align: center;"><img alt="" height="84" src="../../p1q10.png" width="240"></p><p>If the speed of sound in cold air is 340 ms<sup>-1</sup> what is the speed in warm air?</p></div><div class="q-answer"><p><label class="radio"> <input type="radio"> <span>700 ms<sup>-1</sup></span></label> </p><p><label class="radio"> <input type="radio"> <span>320 ms<sup>-1</sup></span></label> </p><p><label class="radio"> <input type="radio"> <span>400 ms<sup>-1</sup></span></label> </p><p><label class="radio"> <input class="c" type="radio"> <span>350 ms<sup>-1</sup></span></label> </p></div><div class="q-explanation"><p>time is the same = d/c = 680/340 = 700/c</p></div><div class="slide-q-actions"><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="exercise shadow-bottom"><div class="q-question"><p>What is true about the velocity of a pendulum bob executing simple harmonic motion?</p></div><div class="q-answer"><p><label class="radio"> <input type="radio"> <span>It is proportional to displacement</span></label> </p><p><label class="radio"> <input class="c" type="radio"> <span>It is maximum when acceleration is minimum</span></label> </p><p><label class="radio"> <input type="radio"> <span> <span new="" roman="" style="font-size:12.0pt;font-family:Calibri;
mso-ascii-theme-font:minor-latin;mso-fareast-font-family:Calibri;mso-fareast-theme-font:
minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:" times="">It always is in the direction of displacement</span></span></label> </p><p><label class="radio"> <input type="radio"> <span> <span new="" roman="" style="font-size:12.0pt;font-family:Calibri;
mso-ascii-theme-font:minor-latin;mso-fareast-font-family:Calibri;mso-fareast-theme-font:
minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:" times="">It is inversely proportional to acceleration</span></span></label> </p></div><div class="q-explanation"><p>at equilibrium acceleration = zero but velocity = max</p></div><div class="slide-q-actions"><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="exercise shadow-bottom"><div class="q-question"><p>What are the changes to speed and wavelength when sound passes from air into water?</p><p><br>Speed ---- Wavelength</p></div><div class="q-answer"><p><label class="radio"> <input type="radio"> <span>decrease ---- increase</span></label> </p><p><label class="radio"> <input type="radio"> <span>decrease ---- decrease</span></label> </p><p><label class="radio"> <input class="c" type="radio"> <span>increase ---- increase</span></label> </p><p><label class="radio"> <input type="radio"> <span>increase ---- decrease</span></label> </p></div><div class="q-explanation"><p>wave speeds up so peaks are more spread</p></div><div class="slide-q-actions"><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="exercise shadow-bottom"><div class="q-question"><p>he 1<sup>st</sup> harmonic of the guitar string shown has frequency f.</p><p style="text-align: center;"><img alt="" height="133" src="../../p1q13.png" width="300"></p><p>What frequency note would be played if a node is made to appear at point P?</p></div><div class="q-answer"><p><label class="radio"> <input type="radio"> <span>f/2</span></label> </p><p><label class="radio"> <input type="radio"> <span>f/4</span></label> </p><p><label class="radio"> <input type="radio"> <span>2f</span></label> </p><p><label class="radio"> <input class="c" type="radio"> <span>4f</span></label> </p></div><div class="q-explanation"><p>wavelength will be1/4 of 1st harmonic</p></div><div class="slide-q-actions"><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="exercise shadow-bottom"><div class="q-question"><p>The circuit represents two resistors connected to a cell.</p><p style="text-align: center;"><img alt="" height="214" src="../../p1q14.png" width="231"></p><p>What changes would occur in the ammeter and voltmeter readings if the switch was closed.</p><p>Ammeter ---- Voltmeter</p></div><div class="q-answer"><p><label class="radio"> <input type="radio"> <span>decrease ---- decrease</span></label> </p><p><label class="radio"> <input class="c" type="radio"> <span>increase ---- increase</span></label> </p><p><label class="radio"> <input type="radio"> <span>decrease ---- increase</span></label> </p><p><label class="radio"> <input type="radio"> <span>increase ---- decrease</span></label> </p></div><div class="q-explanation"><p>short circuiting R reduces total R so current increases and pd increases</p></div><div class="slide-q-actions"><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="exercise shadow-bottom"><div class="q-question"><p>A hydrogen atom enters a region of magnetic field, in the direction shown.</p><p style="text-align: center;"><img alt="" height="113" src="../../p1q15a.png" width="296"></p><p>Which of the arrows below best represents the path of the particle?</p><p style="text-align: center;"><img alt="" height="175" src="../../p1q15b.png" width="137"></p></div><div class="q-answer"><p><label class="radio"> <input type="radio"> <span>D</span></label> </p><p><label class="radio"> <input type="radio"> <span>C</span></label> </p><p><label class="radio"> <input type="radio"> <span>A</span></label> </p><p><label class="radio"> <input class="c" type="radio"> <span>B</span></label> </p></div><div class="q-explanation"><p>hydrogen atom has no charge so not deflected by B field.</p></div><div class="slide-q-actions"><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="exercise shadow-bottom"><div class="q-question"><p>A cell of EMF 12 V is connected to 3 resistors as shown.</p><p style="text-align: center;"><img alt="" height="147" src="../../p1q16.png" width="190"></p><p>What is the potential difference across X?</p></div><div class="q-answer"><p><label class="radio"> <input type="radio"> <span>3 V</span></label> </p><p><label class="radio"> <input type="radio"> <span>9 V</span></label> </p><p><label class="radio"> <input class="c" type="radio"> <span>6 V</span></label> </p><p><label class="radio"> <input type="radio"> <span>12 V</span></label> </p></div><div class="q-explanation"><p>Total R = 6Ω</p><p>I = 12/6 = 2A</p><p>V = IR = 2 x 3</p></div><div class="slide-q-actions"><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="exercise shadow-bottom"><div class="q-question">A mass m moves in a circle of radius r at constant speed v due to the tension T in a string.<p>What is the work done on the mass?</p></div><div class="q-answer"><p><label class="radio"> <input type="radio"> <span>Tv</span></label> </p><p><label class="radio"> <input type="radio"> <span><span class="scayt-misspell-word" data-scayt-word="2πrT" data-wsc-id="k77r3jqbry7e3nw8n" data-wsc-lang="en_US">2πrT</span></span></label> </p><p><label class="radio"> <input class="c" type="radio"> <span>zero</span></label> </p><p><label class="radio"> <input type="radio"> <span>½mv<sup>2</sup></span></label> </p></div><div class="q-explanation"><p>force is perpendicular to direction of motion.</p></div><div class="slide-q-actions"><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="exercise shadow-bottom"><div class="q-question"><p>The activity of a radioactive source decays from 110 Bq to 35 Bq in 1 minute. After 1 hour the detector still registers a constant count rate of 10 Bq. What is the half-life of the source?</p></div><div class="q-answer"><p><label class="radio"> <input type="radio"> <span>60 s</span></label> </p><p><label class="radio"> <input type="radio"> <span>120 s</span></label> </p><p><label class="radio"> <input type="radio"> <span>15 s</span></label> </p><p><label class="radio"> <input class="c" type="radio"> <span>30 s</span></label> </p></div><div class="q-explanation"><p>10 Bq is the background count so subtract from counts</p><p>100 to 25 is 2 half lives.</p></div><div class="slide-q-actions"><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="exercise shadow-bottom"><div class="q-question"><p> <span new="" roman="" style="font-size:12.0pt;font-family:Calibri;
mso-ascii-theme-font:minor-latin;mso-fareast-font-family:Calibri;mso-fareast-theme-font:
minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:" times="">A radioactive element with proton number Z</span><span new="" roman="" style="font-size:12.0pt;font-family:Calibri;mso-ascii-theme-font:minor-latin;
mso-fareast-font-family:Calibri;mso-fareast-theme-font:minor-latin;mso-hansi-theme-font:
minor-latin;mso-bidi-font-family:" times=""></span><span new="" roman="" style="font-size:12.0pt;font-family:Calibri;mso-ascii-theme-font:minor-latin;
mso-fareast-font-family:Calibri;mso-fareast-theme-font:minor-latin;mso-hansi-theme-font:
minor-latin;mso-bidi-font-family:" times=""><span style="mso-spacerun:yes"> </span>decays into one with proton number Z-1 </span><span new="" roman="" style="font-size:12.0pt;font-family:Calibri;mso-ascii-theme-font:minor-latin;
mso-fareast-font-family:" times="">. Which series of emissions could result in this?</span></p></div><div class="q-answer"><p><label class="radio"> <input type="radio"> <span>2β, 1α</span></label> </p><p><label class="radio"> <input class="c" type="radio"> <span>1β, 1α</span></label> </p><p><label class="radio"> <input type="radio"> <span>1α</span></label> </p><p><label class="radio"> <input type="radio"> <span>1β</span></label> </p></div><div class="q-explanation"><p>alpha results in Z - 2</p><p>beta results in Z + 1</p></div><div class="slide-q-actions"><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="exercise shadow-bottom"><div class="q-question"><p>Which conservation law is violated by the following interaction?</p><p align="center">p<sup>+</sup> + e<sup>-</sup> → n<sup>0</sup></p></div><div class="q-answer"><p><label class="radio"> <input class="c" type="radio"> <span>lepton number</span></label> </p><p><label class="radio"> <input type="radio"> <span>charge</span></label> </p><p><label class="radio"> <input type="radio"> <span>strangeness</span></label> </p><p><label class="radio"> <input type="radio"> <span>baryon number</span></label> </p></div><div class="q-explanation"><p>electron has lepton number 1</p></div><div class="slide-q-actions"><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="exercise shadow-bottom"><div class="q-question"><p>The power output from a wind turbine is 10 kW with a wind speed of 4 ms<sup>-1</sup>. What will the power output be for a wind speed of 12 ms<sup>-1</sup>?</p></div><div class="q-answer"><p><label class="radio"> <input type="radio"> <span>180 kW</span></label> </p><p><label class="radio"> <input type="radio"> <span>360 kW</span></label> </p><p><label class="radio"> <input class="c" type="radio"> <span>270 kW</span></label> </p><p><label class="radio"> <input type="radio"> <span>90 kW</span></label> </p></div><div class="q-explanation"><p>P is proportional to v<sup>3</sup></p><p>V is x3 so P is x27</p></div><div class="slide-q-actions"><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="exercise shadow-bottom"><div class="q-question"><p>The <span class="scayt-misspell-word" data-scayt-word="Sankey" data-wsc-id="k77rnlgyy36juch3d" data-wsc-lang="en_US">Sankey</span> diagram represents the energy flow in a power station.</p><p style="text-align: center;"><img alt="" height="155" src="../../p1q22.png" width="375"></p><p>The efficiency of the power station is approximately</p></div><div class="q-answer"><p><label class="radio"> <input type="radio"> <span>90 %</span></label> </p><p><label class="radio"> <input class="c" type="radio"> <span>30 %</span></label> </p><p><label class="radio"> <input type="radio"> <span>75 %</span></label> </p><p><label class="radio"> <input type="radio"> <span>50 %</span></label> </p></div><div class="q-explanation"><p>top arrow is about 1/3 of the energy in</p></div><div class="slide-q-actions"><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="exercise shadow-bottom"><div class="q-question"><p>What part of a nuclear power station reduces the rate of the chain reaction?</p></div><div class="q-answer"><p><label class="radio"> <input type="radio"> <span>moderator</span></label> </p><p><label class="radio"> <input type="radio"> <span>pressure vessel</span></label> </p><p><label class="radio"> <input type="radio"> <span>moderator</span></label> </p><p><label class="radio"> <input class="c" type="radio"> <span>control rods</span></label> </p></div><div class="q-explanation"><p>control rods absorb neutrons</p></div><div class="slide-q-actions"><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="exercise shadow-bottom"><div class="q-question"><p><span new="" roman="" style="font-size:12.0pt;font-family:Calibri;
mso-ascii-theme-font:minor-latin;mso-fareast-font-family:Calibri;mso-fareast-theme-font:
minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:" times="">A mass attached to 2 springs oscillates between points A and B.</span></p><p style="text-align: center;"><img alt="" height="85" src="../../p1q24.png" width="334"></p><p>At which position is the resultant force on the mass zero?</p></div><div class="q-answer"><p><label class="radio"> <input type="radio"> <span>B</span></label> </p><p><label class="radio"> <input type="radio"> <span>A</span></label> </p><p><label class="radio"> <input class="c" type="radio"> <span>O</span></label> </p><p><label class="radio"> <input type="radio"> <span>the resultant force is never zeo</span></label> </p></div><div class="q-explanation"><p>balanced at the equilibrium position</p></div><div class="slide-q-actions"><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="exercise shadow-bottom"><div class="q-question"><p>The diagram represents light of wavelength λ diffracted by a slit of width a.</p><p style="text-align: center;"><img alt="" height="150" src="../../p1q25.png" width="322"></p><p>What change would increase y?</p></div><div class="q-answer"><p><label class="radio"> <input type="radio"> <span>increase a</span></label> </p><p><label class="radio"> <input class="c" type="radio"> <span>decrease a</span></label> </p><p><label class="radio" style=" float: left; margin-right: 40px; "> <input type="radio"> <span>decrease D</span></label> </p><p><label class="radio"> <input type="radio"> <span>decrease λ</span></label> </p></div><div class="q-explanation"><p>ay/D = λ</p><p>y = λD/a</p></div><div class="slide-q-actions"><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div> </div> </div> <div class="modal-footer slide-quiz-actions"> <div class=""> <div class="pull-left pull-xs-none mb-xs-3"> <button class="btn btn-default 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