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THEORY
*2022 NABTEB PHYSICS SOLUTIONS*
1ai. Pressure on a surface is defined as the amount of force exerted (thrust) on a surface per unit area.
II. diagram
1bi. Density is the ratio of mass & volume of a body while relative density is the ratio between density of an object (substance) and the density of some other reference object ( substance) at some given temperature.
Or
Unit of density is kg/m³ or g/cm³ while relative density is dimensionless
1bii.
Weight in air - weight in liquid/ weight in air - weight in water
==> 10 - 4 / 10 - 6 = 1.5
1ci. Capillarity is the tendency of a liquid in a capillary tube or absorbent material to rise or fall as a result of surface tension.
1cii.
- Rise of kerosene in the wick of a lantern
- sucking of ink by the blotting paper
- sucking of water by the towel
2ai.
- change in volume of a liquid with temperature
- change in resistance
- expansion of solid
2aii.
- it should be visible
- it should have uniform thermal expansion
- it should have a low freezing point
- it should have a high boiling point
2b.
- gas molecules are constantly moving
- gas molecules have negligible volume
- gas molecule have negligible intermolecular forces
- gas molecules undergo perfectly elastic collision
2ci. Charles law: This state that the volume of a fixed mass of gas is directly proportional to its absolute temperature when pressure remains constant
2cii. Boyle's law: This state that the volume of a fixed mass of gas is inversely proportional to its pressure when temperature remains constant
2ciii. P1/T1 = P2/T2
T1= 30+273=303k
T2= 80+273=353k
990/303=P2/353
P2= 1,153.4mmhg
3ai. A musical note is a single tone of a specified pitch that is sustained for a given duration.
3aii.
String: guitar, violin
Pipe: folk pipe , tabor pipe
Percussion: drum, xylophone
3bi. Density & elasticity
3bii. This is because soundnhas a wavelength in the order of 1 meter and diffract very easily
3c. Diagram
5a. Diagram
5bi.
Cathode ray
- Cathode ray are a beam of electrons emerging from the cathode(negative terminal) within an electron tube. Electron are actual particles with mass & charge
- loading
X-ray
- x-ray are not charged particles but massless electromagnetic radiation
- loading
5bii.
- mammography
- joint changes & arthritis
- checking symptoms in the body
- diagnosing injuries
5c.
I= 3.0mA ~ 0.003A
V= 30kV ~ 30,000V
P= ?
P= IV
P= 0.003 X 30,000
P= 90watts.
CONTACT COOLBOY FOR YOUR SURE WAEC, NECO, NABTEB,NABTEX,BECE,IJMB, JUPEB,AND PRIVATE WASSCE (GCE) QUESTIONS AND ANSWERS BEFORE EXAM
COOLBOY
WHATSAPP NUMBER
08035452768
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