NABTEB GCE 2021 PHYSICS QUESTIONS AND ANSWERS

1aii)
Diffusion is the process by which different forms of fluids mix with one another due to the kinetic nature of their parties.
Or
Is the movement of a gas particles from a region of higher concentration to a region of lower concentration.
1aiii)
-Temperature
-Pressure

1bi)
Elasticity is the ability for a body to regain its original shape and size after undergoing a stretching or compression force.

1bii)
Elastic Constant is the force that produces a unit extension of the material.

1biiI)
Diagram!

1ci)
Horizontal range is the horizontal distance between the point of projection and the point od landing.

1cii)
-Q=Angle of Projection
-R is the maximum when Q =45degree.

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2ai)

Tabulate Between Temperature and Heat.

Under Temperature
-it is the degree of hotness or coldness of a body
-it is fundamental quality
-it is directly determined by a thermometer

Under heat
-it is a form of energy
-it is derived quality
-its not determined directly by an instrument.

2aii)
Heat:It is meansured in joules
Temperature: its measured in kelvin.

2aiii)
Choose 2 Only.
-change in resistance
-expansions of solid
-expansions of volume of gas
-change in volume of liquid with temperature

2bi)
Determination of the upper -Fixed point for a mercury in glass thermometer.
Draw the Diagram.

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5ai)
Electrical to thermal to mechanical (kinetic energy) to thermal to electromagnetic

5aii)
Tabulate
Hard X-rays and Soft X-rays

Under Hard x-rays
-High Voltage
-short wavelength
-high penetration
-produced by high voltage.

Under soft x-rays
-low voltage
-long wavelenth
-low penetration
-produced by low voltage

5aii)
-Used in diagnosis of ulcher
-to detect alteration to work of art.
-to detect hidden cracks in materials.

5aiv)
Choose 1 only.
-Skin Burn
-Tissue damage
-cataracts
-graying
5b)
Let atomic mass unit of tritium be 3/1H be X
Therefore,
2.01410x2x931=(x+1.00783)931+4.03

3750.254=(x+1.007783)9311403