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*2020 WAEC GCE ALTERNATIVE TO PRACTICAL ANSWERS VERIFIED EXPO*

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(1)
Tabulate
S/n ; 1|2|3|4|5
Xi/Cm; |6.50|6 00|5.50|5.00|4.50

Xi/cm; |32.50|30 00|27.50|25.00|22.50

Mg/I; |100.00|120.00|150.00|170.00|22000|

Xi^-¹/cm^-¹; |0.031|0.033|0.036|0.04|0.044|

Graph.
[img]https://i.imgur.com/EQ2hUAa.jpg[/img]

(1ix)
Slope S = DXi^-¹/cm^-¹/Δm/g = 0.044-0.031/220-100 =1.083*10^-⁴

(1x)
S=1.083*10^-⁴ =1/45(50+Mr)
50 + Mr = 1/45*1.083*10^-⁴
=205.13
Mr=205.13-50=155.13gcm

(1xi)
(i)I close the window to avoid air resistance during balancing of the meter rule
(ii)I took my reading at eye level to avoid error due to parallax

1bi)
•The first condition is that the net force on the object must be zero for the object to be stable
•If net force is zero, then net force along any direction is zero.

1bii)
(i) Magnitude of force applied.
(ii) Distance of line of action of the force from the axis of rotation.

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2avii.
Precautions taken are:
1. I ensured neat traces by using sharp pencil.
2. I ensured that the pins are vertically erect.
3. I avoided parallax error when reading the protractor.
4. I ensured that the pins are well spaced which is 4cm apart

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3a.( IX.)
1. The reading should be taken when the meter is steady.
2. Large current or voltage must not be passed into the meter because it might damage it.
3. The calorimeter must be properly lagged to prevent heat loss.

Choose any 3.

3b)
SPECIFIC HEAT CAPACITY: of a substance is defined as the quality of heat supplied or required to raise the temperature of a unit mass of 1kg through a unit rise in the temperature of 1kelvin.(K)

(3bi)
The specific heat of a substance is the amount of energy required to raise the temperature of 1 gram of the substance by 1°C. … The units for specific heat can either be joules per gram per degree (J/g°C) or calories per gram per degree (cal/g°C). This text will use J/g°C for specific heat.

3bii)

Pt=C¶

P x 12 ×60=(50-30) × 6300

P=175W

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2020 WAEC GCE PHYSICS PRACTICAL Questions and Answers

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