# AS Level Physics U6 Energy Work Power & Efficiency Quiz

Quiz by Jeffrey Piggott, updated more than 1 year ago
 Created by Jeffrey Piggott almost 2 years ago
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### Description

Quiz on AS Level Physics Unit 6 Energy Work & Power

## Resource summary

### Question 1

Question
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 1.0 × 10^6 J
• B 2.0 × 10^6 J
• C 1.0 × 10^9 J
• D 2.0 × 10^9 J

### Question 2

Question
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?
• A 8.0 %
• B 8.2 %
• C 80 %
• D 82 %

### Question 3

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

### Question 4

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

### Question 5

Question
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?
• A 8.1 %
• B 8.5 %
• C 48 %
• D 83 %

### Question 6

Question
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?
Image:
Q Trains
• A
• B
• C
• D

### Question 7

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

### Question 8

Question
A transformer has the following input and output. What is the efficiency of the transformer?
Image:
Eff Q9
• A 0.94 %
• B 1.0 %
• C 11 %
• D 94 %

### Question 9

Question
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?

### Question 10

Question
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?
Image:
Eff Q10
• A 14 %
• B 16 %
• C 22 %
• D 47 %

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