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ICSE Class 10 Physics Solved Question Paper 2011

Long Answer Type

41.
Three resistors are connected to a 12 V battery as shown in the figure given below:

i) What is the current through the 8 ohm resistor?
ii) What is the potential difference across the parallel combination of 6 ohm and 12 ohm resistor?
iii) What is the current through the 6 ohm resistor?

Here, 12 ohm and 6 ohm resistors are connected in parallel.

Therefore, their effective resistance, $fraction numerator 12 cross times 6 over denominator 12 plus 6 space end fraction space equals space 72 over 18 equals 4 straight capital omega$
Total resistance of the circuit = 8+4 = 12

i) Current drawn = $E over R equals 12 over 12 equals 1 space A$
That is, current through the 8 om resistor = 1 A

ii) P.D. across the 8 ohm resistor = I R = 1 = 8 V

P.D. across the parallel combination of resistors = 12 – 8 = 4 V

Because, the resistances are in parallel and they have the same P.D. each.

That is equal to 4 V.

iii) Current through the 6 ohm resistor = $Error converting from MathML to accessible text.$

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42.

Two bulbs are marked 100 W, 220 V, and 60 W, 110 W. Calculate the ratio of their resistances.

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43.

i) What is the color code for the insulation on the earth wire

ii) Write an expression for calculating electrical power in terms of current and resistance.

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44.

i) Name a device which is commonly used to convert an electrical signal into a visual signal.

ii) The nucleus $straight X presubscript 84 presuperscript 202$ emits an alpha particle and forms the nucleus Y. Represent this change in the form of an equation.

iii) What changes will take place in the mass number and atomic number of the nucleus Y if it emits gamma radiations?