32169992
Descrição
Quiz por Jeffrey Piggott, atualizado more than 1 year ago
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Criado por Jeffrey Piggott
mais de 3 anos atrás
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Questão 1
Questão
The radius of the Earth is approximately 6.4 × 10^6 m, and the radius of the Moon is approximately
1.7 × 10^6 m.
A student wishes to build a scale model of the Solar System in the classroom, using a football of radius 0.12m to represent the Earth.
Which object would best represent the Moon?
Responda
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basketball
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cherry
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golf ball
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tennis ball
Questão 2
Questão
A micrometer screw gauge is used to measure the diameter of a copper wire.
The reading with the wire in position is shown in diagram 1. The wire is removed and the jaws of
the micrometer are closed. The new reading is shown in diagram 2.
What is the diameter of the wire?
Image:
Q2 (binary/octet-stream)
Responda
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1.90 mm
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2.45 mm
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2.59 mm
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2.73 mm
Questão 3
Questão
A digital meter has an accuracy of ±1%.
The meter is used to measure the current in an electrical circuit.
The reading on the meter varies between 3.04A and 3.08A.
What is the value of the current, with its uncertainty?
Responda
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(3.06 ± 0.02)A
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(3.06 ± 0.04)A
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(3.06 ± 0.05)A
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(3.06 ± 0.07)A
Questão 4
Questão
What is the unit of resistance when expressed in SI base units?
Responda
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kg.m^2.s^–2.A^–1
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kg.m^2.s^–3.A^–2
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kg .m.s^–2.A^–1
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kg.m.s^–3.A^–1
Questão 5
Questão
Three of these quantities have the same unit.
Which quantity has a different unit?
Responda
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energy/distance
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force
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power × time
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rate of change of momentum
Questão 6
Questão
Which unit can be expressed in base units as kg.m^2.s^–2?
Responda
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joule
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newton
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pascal
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watt
Questão 7
Questão
What is equivalent to 2000 microvolts?
Responda
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2µJ.C^–1
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2 mV
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2 pV
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2000 mV
Questão 8
Questão
The Planck constant 'h' has SI units J.s.
Which equation could be used to calculate the Planck constant?
Responda
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h = DE/v where D is distance, E is energy and v is velocity.
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h = v/D where v is velocity and D is distance.
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h = 1/4 π E where E is electric field strength.
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h = Fr^2/m where F is force, r is radius and m is mass.
Questão 9
Questão
Which is an SI base unit?
Responda
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current
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gram
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kelvin
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volt
Questão 10
Questão
Osmium, a naturally occurring element, has a density of 23000 kg.m^–3.
What is also a value of the density of osmium?
Responda
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2.3 × 10^4 µg.cm^–3
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2.3 × 10^4 g.cm^–3
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2.3 kg.cm^–3
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2.3 × 10^–2 kg.cm^–3
Questão 11
Questão
Which expression gives an SI base quantity?
Responda
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A charge per unit time.
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B force per unit area.
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C mass per unit volume.
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D work done per unit distance.
Questão 12
Questão
Which list contains only scalar quantities?
Responda
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A area, length, displacement
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B kinetic energy, speed, power
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C potential energy, momentum, time
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D velocity, distance, temperature
Questão 13
Questão
A micrometer is used to measure the 28.50 mm width of a plastic ruler. The micrometer reads to
the nearest 0.01 mm.
What is the correct way to record this reading?
Responda
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A 0.02850 ± 0.01 m
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B 0.0285 ± 0.001 m
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C (2.850 ± 0.001) × 10^–2 m
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D (2.850 ± 0.001) × 10^–3 m
Questão 14
Questão
The sides of a wooden block are measured with calipers. The lengths of the sides are measured
as 20.0 mm, 40.0 mm and 10.0 mm.
The calipers can measure with an absolute uncertainty of ± 0.1 mm.
What is the percentage uncertainty in the calculated volume of the block?
Responda
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A 0.3%
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B 1.8%
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C 3.8%
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D 30%
Questão 15
Questão
Which quantity with its unit is correct?
Responda
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A acceleration of a bicycle = 1.4 m.s^–1
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B electric current in a lamp = 0.25A.s^–1
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C electric potential difference across a battery = 8.0 J.C^–1
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D kinetic energy of a car = 4500 N.m^–1
Questão 16
Questão
Which two units are not equivalent to each other?
Responda
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A N.m and kg.m^2.s^–2
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B N.s and kg.m.s^–1
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C J.s^–1 and kg.m^2.s^–3
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D Pa and kg.m s^–2
Questão 17
Questão
What could reduce systematic errors?
Responda
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A averaging a large number of measurements
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B careful calibration of measuring instruments
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C reducing the sample size
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D repeating measurements
Questão 18
Questão
The power loss P in a resistor is calculated using the formula P = V^2/R.
The percentage uncertainty in the potential difference V is 3% and the percentage uncertainty in
the resistance R is 2%.
What is the percentage uncertainty in P?
Responda
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4%
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7%
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8%
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11%
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