IGCSE Physics Paper-2: Specimen Questions with Answers 7 - 12 of 20

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Passage

Two resistors are connected in parallel with 10 V power supply in circuit given below

Parallel Resistors Circuit

Question 7 (1 of 3 Based on Passage)

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Calculate the combined resistance of the resistors.

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Explanation

For parallel resistors, equivalent resistor can be calculated as,

Here, both resistors are of same resistance,

Question 8 (2 of 3 Based on Passage)

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Calculate the current I, passing through the circuit,

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Explanation

Total current in the circuit is calculated by Ohm՚s law as,

Question 9 (3 of 3 Based on Passage)

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Calculate current passing through both the parallel resistors, .

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Explanation

Voltages across both resistors are same, also resistance of both the resistors are same, therefore from Ohm՚s law,

Now, total current is sum of individual current and

Passage

In an experiment to find the density of some oil, a student takes the following readings.

An Empty Measuring Cylinder

Mass of empty measuring cylinder = 850 g

A Measuring Cylinder is Filled by Oil

Mass of cylinder containing 600 cm3 oil = 2050 g

Question 10 (1 of 3 Based on Passage)

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Calculate the mass of oil in the cylinder.

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Explanation

Mass of oil is calculated as,

Question 11 (2 of 3 Based on Passage)

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Calculate the density of the oil.

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Explanation

Density of the oil is given as,

Question 12 (3 of 3 Based on Passage)

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Water is rarer than oil.

On Figure, mark approximately where the surface of the same mass of water would be if it replaced the oil.

A Measuring Cylinder is Filled by Oil
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Explanation

Density of the water is less than oil . Now, the formula of density,

Therefore volume of the water for same mass is more than the oil

A Measuring Cylinder is Filled by Water

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