AS Level Physics U6 Energy Work Power & Efficiency Quiz

Pregunta 1 de 10

1

A railway engine accelerates a train of total mass 800 tonnes (1 tonne = 1000 kg) from rest to a speed of 50 m.s^–1.

How much work must be done on the train to reach this speed?

Selecciona una de las siguientes respuestas posibles:

A 1.0 × 10^6 J
B 2.0 × 10^6 J
C 1.0 × 10^9 J
D 2.0 × 10^9 J

Explicación

Pregunta 2 de 10

1

Water from a reservoir is fed to the turbine of a hydroelectric system at a rate of 500 kg.s^–1.
The reservoir is 300 m above the level of the turbine.
The electrical output from the generator driven by the turbine is 200 A at a potential difference of 6000 V.

What is the efficiency of the system?

Selecciona una de las siguientes respuestas posibles:

A 8.0 %
B 8.2 %
C 80 %
D 82 %

Explicación

Pregunta 3 de 10

1

A piston in a gas supply pump has an area of 500 cm2 and it moves a distance of 30 cm during one stroke.
The pump moves the gas against a fixed pressure of 4000 Pa.

How much work is done by the piston during one stroke?

Selecciona una de las siguientes respuestas posibles:

A 60 J
B 6.0 × 10^3 J
C 6.0 × 10^5 J
D 6.0 × 10^7 J

Explicación

Pregunta 4 de 10

1

A railway engine accelerates a train of total mass 1200 tonnes (1 tonne = 1000 kg) from rest to a speed of 75 m.s^–1.

How much useful work must be done on the train to reach this speed?

Selecciona una de las siguientes respuestas posibles:

A 1.7 × 10^6 J
B 3.4 × 10^6 J
C 1.7 × 10^9 J
D 3.4 × 10^9 J

Explicación

Pregunta 5 de 10

1

A crane is being used to lift containers off a ship. One container has a mass of 14 000 kg and is being lifted vertically with a speed of 3.2 m.s^–1.
The electric motor being used to supply the power to lift the container is using a current of 240 A at a potential difference of 2200 V.

What is the efficiency of the system?

Selecciona una de las siguientes respuestas posibles:

A 8.1 %
B 8.5 %
C 48 %
D 83 %

Explicación

Pregunta 6 de 10

1

Trains supply coal to a power station. The table below gives quantities describing the operation of the power station.

Which expression gives the efficiency of the power station?

Selecciona una de las siguientes respuestas posibles:

A
B
C
D

Explicación

Pregunta 7 de 10

1

A piston in a gas supply pump has an area of 400 cm2 and it moves a distance of 25 cm during one stroke.
The pump moves the gas against a fixed pressure of 3000 Pa.

How much work is done by the piston during one stroke?

Selecciona una de las siguientes respuestas posibles:

A 30 J
B 3.0 × 10^3 J
C 3.0 × 10^5 J
D 3.0 x 10^7 J

Explicación

Pregunta 8 de 10

1

A transformer has the following input and output.

What is the efficiency of the transformer?

Selecciona una de las siguientes respuestas posibles:

A 0.94 %
B 1.0 %
C 11 %
D 94 %

Explicación

Pregunta 9 de 10

1

The data below are taken from a test of a petrol engine for a motor car.
power output 150 kW
fuel consumption 20 litres per hour
energy content of fuel 40 MJ per litre

Which expression will evaluate the efficiency of the engine?

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 10 de 10

1

The diagram shows the design of a water wheel which drives a generator to produce electrical energy. The flow rate of the water is 200 kg.s^–1. The generator supplies a current of 32 A at a voltage of 230 V.

Ignoring any changes in kinetic energy of the water, what is the efficiency of the system?

Selecciona una de las siguientes respuestas posibles:

A 14 %
B 16 %
C 22 %
D 47 %

	Creado por Jeffrey Piggott hace más de 5 años

Quiz on AS Level Physics Unit 6 Energy Work & Power

AS Level Physics U6 Energy Work Power & Efficiency Quiz

Pregunta 1 de 10

A railway engine accelerates a train of total mass 800 tonnes (1 tonne = 1000 kg) from rest to a speed of 50 m.s^–1. How much work must be done on the train to reach this speed?

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 2 de 10

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 3 de 10

A piston in a gas supply pump has an area of 500 cm2 and it moves a distance of 30 cm during one stroke. The pump moves the gas against a fixed pressure of 4000 Pa. How much work is done by the piston during one stroke?

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 4 de 10

A railway engine accelerates a train of total mass 1200 tonnes (1 tonne = 1000 kg) from rest to a speed of 75 m.s^–1. How much useful work must be done on the train to reach this speed?

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 5 de 10

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 6 de 10

Trains supply coal to a power station. The table below gives quantities describing the operation of the power station. Which expression gives the efficiency of the power station?

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 7 de 10

A piston in a gas supply pump has an area of 400 cm2 and it moves a distance of 25 cm during one stroke. The pump moves the gas against a fixed pressure of 3000 Pa. How much work is done by the piston during one stroke?

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 8 de 10

A transformer has the following input and output. What is the efficiency of the transformer?

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 9 de 10

The data below are taken from a test of a petrol engine for a motor car. power output 150 kW fuel consumption 20 litres per hour energy content of fuel 40 MJ per litre Which expression will evaluate the efficiency of the engine?

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 10 de 10

Selecciona una de las siguientes respuestas posibles:

Explicación

A railway engine accelerates a train of total mass 800 tonnes (1 tonne = 1000 kg) from rest to a speed of 50 m.s^–1.

How much work must be done on the train to reach this speed?

A piston in a gas supply pump has an area of 500 cm2 and it moves a distance of 30 cm during one stroke.
The pump moves the gas against a fixed pressure of 4000 Pa.

How much work is done by the piston during one stroke?

A railway engine accelerates a train of total mass 1200 tonnes (1 tonne = 1000 kg) from rest to a speed of 75 m.s^–1.

How much useful work must be done on the train to reach this speed?

Trains supply coal to a power station. The table below gives quantities describing the operation of the power station.

Which expression gives the efficiency of the power station?

A piston in a gas supply pump has an area of 400 cm2 and it moves a distance of 25 cm during one stroke.
The pump moves the gas against a fixed pressure of 3000 Pa.

How much work is done by the piston during one stroke?

A transformer has the following input and output.

What is the efficiency of the transformer?

The data below are taken from a test of a petrol engine for a motor car.
power output 150 kW
fuel consumption 20 litres per hour
energy content of fuel 40 MJ per litre

Which expression will evaluate the efficiency of the engine?