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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?

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42.
Two bulbs are marked 100 W, 220 V, and 60 W, 110 W. Calculate the ratio of their resistances.

straight R space equals V squared over P space rightwards double arrow space space R subscript 1 equals 220 squared over 100 space space space space space straight R subscript 2 space equals space 110 squared over 60 space rightwards double arrow space R subscript 1 over R subscript 2 equals space fraction numerator 220 space cross times 220 cross times 60 over denominator 100 cross times 110 cross times 110 end fraction equals space 12 over 15

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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?