CIE Physics Paper-2: Specimen Questions 7 - 11 of 20

Passage

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

Parallel resistors circuit

Parallel resistors circuit

In figure two resistors of 10 ohms are connected in parallel with 10 V power supply.

Question number: 7 (1 of 3 Based on Passage) Show Passage

Short Answer Question▾

Write in Short

Calculate the combined resistance of the 10Ω resistors.

Explanation

For parallel resistors, equivalent resistor can be calculated as,

1Req=1R1+1R2

Here, both resistors are of same resistance, R1=R2=10Ω

1Req=110+110=210

Req=5Ω

Question number: 8 (2 of 3 Based on Passage) Show Passage

Short Answer Question▾

Write in Short

Calculate current passing through both the parallel resistors, (I1&I2) .

Explanation

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

I1=I2

Now, total current is sum of individual current I1 and I2,

I=I1+I2

2=2I1

I1=I2=1A

Question number: 9 (3 of 3 Based on Passage) Show Passage

Short Answer Question▾

Write in Short

Calculate the current I, passing through the circuit,

Explanation

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

Req=VI

I=VReq

I=105=2A

Passage

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

An empty measuring cylinder

An empty measuring cylinder

In figure an empty measuring cylinder is shown.

Mass of empty measuring cylinder = 850 g

A measuring cylinder is filled by oil

A measuring cylinder is filled by oil

Figure shows a measuring cylinder is filled by some oil.

Mass of cylinder containing 600 cm3 oil = 2050 g

Question number: 10 (1 of 3 Based on Passage) Show Passage

Short Answer Question▾

Write in Short

Calculate the mass of oil in the cylinder.

Explanation

Mass of oil MOil is calculated as,

MOil=Moil+cylinderMcylinder

Moil=2050g850g

Moil=1200g

Question number: 11 (2 of 3 Based on Passage) Show Passage

Short Answer Question▾

Write in Short

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

A measuring cylinder is filled by oil

Figure shows a measuring cylinder is filled by some oil.

Explanation

Density of the water is less than oil (ρw<ρo) . Now, the formula of density,

Density=MassVolume

Density1Volume

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

A measuring cylinder is filled by water

A measuring cylinder is filled by water

Figure shows a measuring cylinder is filled by some water.

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