The water bath is heated and the air in turn gets heated and its temperatures noted with the corresponding values of pressure noted on the bourdon gauge. Several values of Temperature, and T and corresponding pressure, P are tabulated. A graph of P against T is drawn. The graph is a straight line showing that pressure is directly proportional to temperature.
johnmulu answered the question on May 29, 2017 at 05:46
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Figure 7 shows an experiment set-up that may be used to investigate one of the laws. The glass tube has a uniform bore and it is graduated in millimeters.
(Solved)
Figure 7 shows an experiment set-up that may be used to investigate one of the laws. The glass tube has a uniform bore and it is graduated in millimeters.
(i) Describe how the experiment is carried out and explain how the results obtained verify the law.
(ii) State two limitations of the set-up.
Date posted:
May 29, 2017
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Answers (1)
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Figure 5 shows a set up that ,a set up that may be used to verify Charles' law.
(Solved)
Figure 5 shows a set up that ,a set up that may be used to verify Charles' law.
(i) State the measurements that should be taken in the experiment.
(ii) What is the purpose of the water bath?
Date posted:
May 29, 2017
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Answers (1)
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Fig. 2 shows a set-up that may be used to verify Boyle's law.
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Fig. 2 shows a set-up that may be used to verify Boyle's law.
Describe the measurements that should be taken in the experiment.
Date posted:
May 27, 2017
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Answers (1)
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Figure 8 shows a graph of the variation of temperature with time for a pure substance heated at a constant rate.
(Solved)
Figure 8 shows a graph of the variation of temperature with time for a pure substance heated at a constant rate.
Assuming that heat transfer to the surroundings is negligible, state the changes observed on the substance in region:
(a) BC;
(b) DE
Date posted:
May 27, 2017
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Answers (1)
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Figure 4 shows a graph of temperature against time when pure melting ice at 0oC is heated uniformly.
(Solved)
Figure 4 shows a graph of temperature against time when pure melting ice at 0oC is heated uniformly.
Explain what happens between parts:
(i) OA
(ii) AB
Date posted:
May 27, 2017
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Answers (1)
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Figure 11 shows the features of a domestic refrigerator. A volatile liquid circulates through the capillary tubes under the action of the compression pump.
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Figure 11 shows the features of a domestic refrigerator. A volatile liquid circulates through the capillary tubes under the action of the compression pump.
(i) State the reaction for using a volatile liquid.
(ii) what is the purpose of double wall?
Date posted:
May 27, 2017
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Answers (1)
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Figure 9, shows a circuit that may be used to charge a capacitor.
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Figure 9, shows a circuit that may be used to charge a capacitor.
(i) State the observation on the milliameter when the circuit is switched on.
(ii) Explain the observation in (i) above.
Date posted:
May 27, 2017
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Answers (1)
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Figure 3 shows a voltmeter connected across two charged parallel plates.
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Figure 3 shows a voltmeter connected across two charged parallel plates.
When a thin sheet of mica is inserted between the plates, the voltmeter reading is observed to reduce. Explain this observation.
Date posted:
May 27, 2017
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Answers (1)
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Figure 7 shows a "windmill" which when connected to the dome of a positively charged Van de Graff generator is observed to rotate as indicated. A, B, C and D are sharp points.
(Solved)
Figure 7 shows a "windmill" which when connected to the dome of a positively charged Van de Graff generator is observed to rotate as indicated. A, B, C and D are sharp points.
Explain how this rotation is caused.
Date posted:
May 26, 2017
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Answers (1)
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Figure 7 shows a sharp pin fixed on a cap of leaf electroscope. The electroscope is highly charged and then left for some time.
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Figure 7 shows a sharp pin fixed on a cap of leaf electroscope. The electroscope is highly charged and then left for some time.
Explain why the leaf collapses.
Date posted:
May 26, 2017
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Answers (1)
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In an experiment to observe interference of light waves a double slit is placed close to the source. See Fig. 3
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In an experiment to observe interference of light waves a double slit is placed close to the source. See Fig. 3
(i) State the function of the double slit.
(ii) Describe what is observed on the screen.
Date posted:
May 26, 2017
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Answers (1)
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Figure 9 shows the graph of the relationship between current I and potential difference V for two tungsten filament lamps X and Y. The normal working voltages for the lamp X and lamp Y are 2.5 V and 3.0 V respectively.
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Figure 9 shows the graph of the relationship between current I and potential difference V for two tungsten filament lamps X and Y. The normal working voltages for the lamp X and lamp Y are 2.5 V and 3.0 V respectively.
(a) Explain the change in the shape of the curves as the current increases.
(b) Determine the resistance of the lamps X at the normal working voltage.
(c) The lamps are now connected in a series circuit in which a current of 0.4 A flows. Find the potential differences across lamp Y.
Date posted:
May 23, 2017
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Answers (1)
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In figure 11 the voltmeter reads 2.1 V when the switch is open. When the switch is closed, the voltmeter reads 1.8 V and the ammeter reads 0.1 A.
(Solved)
In figure 11 the voltmeter reads 2.1 V when the switch is open. When the switch is closed, the voltmeter reads 1.8 V and the ammeter reads 0.1 A.
()
Determine:
(i) The e.m.f of the cell.
(ii) The internal resistance of the cell.
(iii) The resistance of the lamp.
Date posted:
May 23, 2017
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Answers (1)
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The cell in Figure 10 has an e.m.f of 2.1 V and negligible internal resistance.
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The cell in Figure 10 has an e.m.f of 2.1 V and negligible internal resistance.
Determine the
(i) Total resistance in the circuit
(ii) Current in the circuit
(iii) Reading of the voltmeter
Date posted:
May 23, 2017
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Answers (1)
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Figure 4 shows an electrical circuit. When the switch is closed the ammeter reading is 0.3 A.
(Solved)
Figure 4 shows an electrical circuit. When the switch is closed the ammeter reading is 0.3 A.
Determine the voltmeter reading.
Date posted:
May 23, 2017
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Answers (1)
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The diagram in Fig. 2 represent an electric circuit in which five resistors are connected to be a battery of e.m.f. 4.0 V and of negligible internal resistance.
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The diagram in Fig. 2 represent an electric circuit in which five resistors are connected to be a battery of e.m.f. 4.0 V and of negligible internal resistance.
Determine:
(i) The current flowing through the 5.5 resistor
(ii) The potential difference between Y and Q.
Date posted:
May 23, 2017
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Answers (1)
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Figure 10 shows a trolley of weight 20 N pulled by a force of 4 N from the bottom to the top of an inclined plane at a uniform speed.
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Figure 10 shows a trolley of weight 20 N pulled by a force of 4 N from the bottom to the top of an inclined plane at a uniform speed.
(i) State the value of the force acting downwards along the inclined plane.
(ii) Explain how the value in part (a)(i) is obtained.
Date posted:
May 16, 2017
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Answers (1)
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Figure 10 shows a pulley system used to raise a load by applying an effort of 500 N
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Figure 10 shows a pulley system used to raise a load by applying an effort of 500 N
State the:
(i) Velocity ratio of the system.
(ii) Purpose of pulley 2.
(iii) Given that the machine has an efficiency of 80%, determine the maximum load that can be raised.
Date posted:
May 16, 2017
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Answers (1)
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Figure 16 shows a screw jack whose screw has a pitch of 1 mm, and has a handle of 25 cm long.
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Figure 16 shows a screw jack whose screw has a pitch of 1 mm, and has a handle of 25 cm long.
Determine the velocity ratio of the jack.
Date posted:
May 16, 2017
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Answers (1)
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Figure 7 shows a mass of 30 kg being pulled from point P to point Q, with a force of 200 N parallel
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Figure 7 shows a mass of 30 kg being pulled from point P to point Q, with a force of 200 N parallel to an inclined plane. The distance between P and Q is 22.5 m. In being moved from P and Q the mass is raised through a vertical height of 7.5 m.
Determine the work done:
(I) By the force;
(II) On the mass;
(III) To overcome friction.
Date posted:
May 16, 2017
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Answers (1)