Final reading = main scale reading + thimble scale reading
= 15. 00 + 0.30 = 15.30 mm, or 1.53 cm; or 1.53 x 10-2m
johnmulu answered the question on April 18, 2017 at 09:24
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Figure 2 shows a soft iron bar AB placed in a coil near a freely suspended magnet.
(Solved)
Figure 2 shows a soft iron bar AB placed in a coil near a freely suspended magnet.
Explain the observation made when the switch is closed.
Date posted:
April 18, 2017
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Answers (1)
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Figure 2 shows a horse – shoe magnet whose poles are labeled and two other magnets near it. Iron nails are attracted to the lower ends of the magnets as shown.
(Solved)
Figure 2 shows a horse – shoe magnet whose poles are labeled and two other magnets near it. Iron nails are attracted to the lower ends of the magnets as shown.
Identify the poles marked X and Y
Date posted:
April 18, 2017
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Answers (1)
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Figure 7 shows how magnets are stored in pairs with keepers at the ends
(Solved)
Figure 7 shows how magnets are stored in pairs with keepers at the ends. Explain how this method of storing helps in retaining magnetic longer
Date posted:
April 18, 2017
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Answers (1)
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In an experiment to magnetize two substances p and Q using electric currents, two curves (graphs) were obtained as shown in fig. 1
(Solved)
In an experiment to magnetize two substances p and Q using electric currents, two curves (graphs) were obtained as shown in fig. 1
Using this information in Fig. 1 explain the difference between the substances P and Q with reference to the domain theory
Date posted:
April 18, 2017
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Answers (1)
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Figure 4 shows the cross-section of a dry cell. Use the information on the figure to answer question a) and b)
(Solved)
Figure 4 shows the cross-section of a dry cell. Use the information on the figure to answer question a) and b)
a) Name the parts labeled A and B
b) State the use of manganese (IV) oxide in the cell.
Date posted:
April 18, 2017
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Answers (1)
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Figure 12, shows an electrical circuit including three switches, S1, S2, S3 and three identical lamps L1, L2, L3. A constant potential difference is applied across X and Y.
(Solved)
Figure 12, shows an electrical circuit including three switches, S1, S2, S3 and three identical lamps L1, L2, L3. A constant potential difference is applied across X and Y.
i) Other than L1, state the lamp that will light when S1 and S2 are closed.
ii) How does the brightness in L1 in (i) above compare with its brightness when all the switches are closed?
iii) Explain the observation in (ii) above
Date posted:
April 18, 2017
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Answers (1)
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Figure 7 shows the features of a dry cell (Leclanche’s). Use the information in the figure to answer the questions a and b
(Solved)
Figure 7 shows the features of a dry cell (Leclanche’s). Use the information in the figure to answer the questions a and b
a) State the polarities of the parts labeled A and B.
b) Name the chemical substance in the parts labeled C and D
Date posted:
April 18, 2017
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Answers (1)
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Figure 7 shows a highly negatively charged rod being brought slowly near the cap of a positively charged leaf electroscope. If is observed that the leaf initially falls and then rises
(Solved)
Figure 7 shows a highly negatively charged rod being brought slowly near the cap of a positively charged leaf electroscope. If is observed that the leaf initially falls and then rises
Explain this observation.
Date posted:
April 17, 2017
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Answers (1)
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Figure 4 shows a source of heat placed at equal distances from two identical flasks X and Y containing air. The surface of X is painted black while Y is clear.
(Solved)
Figure 4 shows a source of heat placed at equal distances from two identical flasks X and Y containing air. The surface of X is painted black while Y is clear.
X and Y are linked by a U-tube filled with whose levels S and T are initially the same. It is later observed that S falls while T rises. Explain this observation.
Date posted:
April 17, 2017
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Answers (1)
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A paper windmill in a horizontal axis was placed above a candle as shown in Figure 2. When the candle was lit the paper windmill begun to rotate. Explain this observation
(Solved)
A paper windmill in a horizontal axis was placed above a candle as shown in Figure 2. When the candle was lit the paper windmill begun to rotate. Explain this observation
Date posted:
April 17, 2017
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Answers (1)
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Figure 3 shows a hot water bath with metal rods inserted through one of its side. Some wax is fixed at the end of each rod. Use this information to answer questions
(Solved)
Figure 3 shows a hot water bath with metal rods inserted through one of its side. Some wax is fixed at the end of each rod. Use this information to answer questions
a) What property of metals could be tested using this set-up?
b) Besides the length of the rods that is kept constant, what else should be kept constant when comparing the property for the different metal rods?
Date posted:
April 17, 2017
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Answers (1)
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When a Bunsen burner is lit below wire guaze, it is noted that the flame initially burns below the guaze as shown in Figure 5 (i). After sometimes, the flame burns below as well as above the gauze in figure 5 (5) (ii)
(Solved)
When a Bunsen burner is lit below wire guaze, it is noted that the flame initially burns below the guaze as shown in Figure 5 (i). After sometimes, the flame burns below as well as above the gauze in figure 5 (5) (ii)
Explain this observation.
Date posted:
April 17, 2017
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Answers (1)
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Two identical aluminium rods are shown in Figure 4. One rests on metal block and the other on a wooden block. The protruding ends are heated on a Bunsen burner as shown.
(Solved)
Two identical aluminium rods are shown in Figure 4. One rests on metal block and the other on a wooden block. The protruding ends are heated on a Bunsen burner as shown.
Date posted:
April 17, 2017
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Answers (1)
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In the set up shown in Fig. 3, water near the top of the boiling tube boils while at the bottom it remains cold.
(Solved)
In the set up shown in Fig. 3, water near the top of the boiling tube boils while at the bottom it remains cold.
Give a reason for the observation
Date posted:
April 15, 2017
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Answers (1)
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Figure 2 shows a flat bottomed flask containing some water. It is heated directly with a very hot flame. Explain why the flask is likely to crack
(Solved)
Figure 2 shows a flat bottomed flask containing some water. It is heated directly with a very hot flame. Explain why the flask is likely to crack
Date posted:
April 15, 2017
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Answers (1)
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Figure 3 shows an aluminium tube tightly stuck in a steel tube.
(Solved)
Figure 3 shows an aluminium tube tightly stuck in a steel tube.
Explain how the two tubes can be separated by applying a temperature change at the same junction given that aluminium expands more than steel for the same temperature rise.
Date posted:
April 15, 2017
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Answers (1)
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In the set up shown in figure 4, it is observed that the level of the water initially drops before starting to rise.
(Solved)
In the set up shown in figure 4, it is observed that the level of the water initially drops before starting to rise.
Explain the observation.
Date posted:
April 15, 2017
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Answers (1)
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Figure 5 shows a flask fitted with a glass tube dipped into a beaker containing water at room temperature. The cork fixing the glass tube to the flask is airtight.
(Solved)
Figure 5 shows a flask fitted with a glass tube dipped into a beaker containing water at room temperature. The cork fixing the glass tube to the flask is airtight.
Use the information and the figure to answer the questions
a) State what is observed when ice-cold water is poured on the flask
b) Give a reason for the observation
Date posted:
April 13, 2017
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Answers (1)
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Figure 1 shows a circuit diagram for controlling the temperature of a room
(Solved)
Figure 1 shows a circuit diagram for controlling the temperature of a room
i) State and explain the purpose of the bimetallic strip.
ii) Describe how the circuit controls the temperature when the switch S is closed.
Date posted:
April 13, 2017
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Answers (1)
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Figure 4 (i) shows a beaker filled with water. Some potassium permanganate was gently introduced at the bottom of the beaker at the position shown
(Solved)
Figure 4 (i) shows a beaker filled with water. Some potassium permanganate was gently introduced at the bottom of the beaker at the position shown
Figure 4 (ii) shows the appearance of the liquid after about 30 minutes. Explain how this appearance was caused
Date posted:
April 13, 2017
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Answers (1)