Physics 2006 Jamb Examination
Physics 2006 Jamb Examination
Question 1
A uniform solid cube material 10cm on each side of mass 700g is submerged in water. which of the following best described the behavior of the cube water?
Density of cube = \( \dfrac{0.7}{(0.1)^3} = 700 \; \text{kg/m}^3 \)
Density of water = 1000 \( \text{kg/m}^3 \)
Since cube's density < water's density, cube will float.
Density of water = 1000 \( \text{kg/m}^3 \)
Since cube's density < water's density, cube will float.
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Question 2
At low humidity in an environment, the human skin is usually?
Low humidity causes moisture loss from the skin, making it dry and rough.
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Question 3
If the relative density of gold is 19.2, the volume of 2.4kg of gold is?
Density of gold = 19.2 \( \times 1000 = 19200 \; \text{kg/m}^3 \)
Volume = \( \dfrac{2.4}{19200} = 1.25 \times 10^{-4} \; m^3 \)
Volume = \( \dfrac{2.4}{19200} = 1.25 \times 10^{-4} \; m^3 \)
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Question 4
The thermometric property of a constant volume thermometer is?
In a constant volume thermometer, the gas volume is fixed, and temperature is measured by the change in pressure.
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Question 5
An immersion heater rated 2.0A, 240V is used to boil water from temperature 52°c to 100°c. If the mass of the water is 2.5kg. determine the time taken to boil the water.
[specific heat capacity of water = 4.2 x 10^3 jkg^-1 k^-1]
[specific heat capacity of water = 4.2 x 10^3 jkg^-1 k^-1]
Heat required: \( Q = mc\Delta T = 2.5 \times 4200 \times (100-52) = 5.04 \times 10^5 J \)
Power = \( VI = 240 \times 2 = 480 W \)
Time = \( \dfrac{Q}{P} = \dfrac{5.04 \times 10^5}{480} \approx 1.05 \times 10^3 s \)
Power = \( VI = 240 \times 2 = 480 W \)
Time = \( \dfrac{Q}{P} = \dfrac{5.04 \times 10^5}{480} \approx 1.05 \times 10^3 s \)
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Question 6
The thermos flask is designed to?
A thermos flask minimizes heat exchange by reducing conduction, convection, and radiation, thereby preventing both heat loss and gain.
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Question 7
what is likely to happen if the glass of a thermometer expands more upon heating than the liquid inside?
If the glass expands more than the liquid, the apparent expansion of the liquid decreases, so the liquid level falls.
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Question 8
A drop of petrol makes a finger colder than a drop of water would because?
Petrol evaporates quickly and absorbs latent heat of vaporization from the finger, producing a stronger cooling effect.
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Question 9
A cell of internal resistance r is connected to an external resistor R. The condition for maximum power transfer is?
Maximum power transfer theorem states that maximum power is delivered when the load resistance equals the internal resistance: \( R = r \).
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Question 10
The production and type of charge of a body can only be accounted for by the?
Electric charge results from the gain or loss of electrons. Surplus gives a negative charge, deficiency gives a positive charge.
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