AQA-PH1HP-QP-JUN12 - Centre Number For Examiners Use Candidate Number Surname Other Names Examiners Initials Candidate Signature Question General

# AQA-PH1HP-QP-JUN12 - Centre Number For Examiners Use...

This preview shows page 1 - 5 out of 20 pages.

2 Do not write outside the box (02) G/K83986/Jun12/PH1HP Answer all questions in the spaces provided. 1 A wood burning stove is used to heat a room. The fire in the stove uses wood as a fuel. The fire heats the matt black metal case of the stove. 1 (a) The air next to the stove is warmed by infrared radiation. How does the design of the stove help to improve the rate of energy transfer by infrared radiation? ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ (2 marks)
3 Do not write outside the box (03) G/K83986/Jun12/PH1HP Turn over 1 (b) Burning 1 kg of wood transfers 15 MJ of energy to the stove. The stove then transfers 13.5 MJ of energy to the room. Calculate the efficiency of the stove. Use the correct equation from the Physics Equations Sheet. Show clearly how you work out your answer. ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ Efficiency = ........................................ (2 marks) 1 (c) Some of the energy from the burning wood is wasted as the hot gases leave the chimney and warm the air outside the house. Name one other way energy is wasted by the stove. ............................................................................................................................................ (1 mark) 1 (d) Some people heat their homes using electric heaters. Other people heat their homes using a wood burning stove. Give two environmental advantages of using a wood burning stove to heat a home rather than heaters that use electricity generated from fossil fuels. 1 ......................................................................................................................................... ............................................................................................................................................ 2 ......................................................................................................................................... ............................................................................................................................................ (2 marks) Question 1 continues on the next page
4 Do not write outside the box (04) G/K83986/Jun12/PH1HP 1 (e) The metal case of the stove gets hot when the fire is lit. Here is some information about the stove. Mass of metal case Starting temperature of metal case Final temperature of metal case Specific heat capacity of metal case 100 kg 20 °C 70 °C 510 J/kg °C Calculate the energy required to raise the temperature of the metal case to 70 °C. Use the correct equation from the Physics Equations Sheet.

#### You've reached the end of your free preview.

Want to read all 20 pages?

• Spring '16
• nour
• Biology, RNA, Energy, Glass, Pastpaperquestions AQA Science, ........., Insulated glazing

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern

Stuck? We have tutors online 24/7 who can help you get unstuck.
Ask Expert Tutors You can ask You can ask You can ask (will expire )
Answers in as fast as 15 minutes