Mark Levesley, Chris Meunier, Fran Eardley and, Gemma Young Solutions for Exercise 10: Exercise 10

Author:Mark Levesley, Chris Meunier, Fran Eardley & Gemma Young

Mark Levesley Science Solutions for Exercise - Mark Levesley, Chris Meunier, Fran Eardley and, Gemma Young Solutions for Exercise 10: Exercise 10

Attempt the free practice questions from Exercise 10: Exercise 10 with hints and solutions to strengthen your understanding. Cambridge Lower Secondary Science Stage 7 : Student's Book solutions are prepared by Experienced Embibe Experts.

Questions from Mark Levesley, Chris Meunier, Fran Eardley and, Gemma Young Solutions for Exercise 10: Exercise 10 with Hints & Solutions

MEDIUM
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 8 - Energy>Exercise 10>Q 1

A car burns fuel with an energy value of 85000 J. 68000 J of this is output from the engine as wasted heat energy and sound energy. Calculate how much useful energy is left for moving the car.

MEDIUM
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 8 - Energy>Exercise 10>Q 3

For the fluorescent light bulb shown in figure, calculate the percentage of the input energy that is transferred usefully.

Question Image

MEDIUM
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 8 - Energy>Exercise 10>Q 4

An old-fashioned filament lamp wastes 95% of the energy supplied to it. Draw an energy transfer (Sankey) diagram for it. 

MEDIUM
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 8 - Energy>Exercise 10>Q 5

A car burns fuel with an energy value of 85000 J . 68000 J of this is output from the engine as wasted as heat energy. What percentage of the chemical fuel energy used by the car that will eventually end up as thermal energy?