Dear students, we are sorry for not uploading the 5117/ 5118 2014 O level Combined Science (Biology) answers/ solutions earlier. We have been trying to answer an overwhelming number of questions from students wanting an explanation to our previous solutions. All solutions/ answers are provided by teachers of Penciltutor School and the Singapore MOE or UCLES bears no responsibility for these suggested solutions/ answers. As usual, if you find any errors in our solutions or if you need an explanation, kindly send an email to admin@penciltutor.com.

## Sunday, November 16, 2014

## Wednesday, November 12, 2014

### Questions regarding Physics 5116 Q20 answer

**Student says**:

"ans is D cuz larger current to strengthen the demagnetisation process or make the steel bar more nt magnet as alternating current(more will be btr to demagnetise) whereas C is decreasing the current means weakening the demagnetising process as the alternative current drops"

**Penciltutor explains**:

"the answer is C as demagnetization of a ferromagnetic material (such as steel) occurs due to successive hysteresis loops. The area of this hysteresis loop is proportional to the energy that is transformed to thermal energy. The formula which deals with the magnetic field inside a solenoid is B = μnΙ, where B is the magnetic field; μ is the magnetic permeability of steel; n is the number of loops per unit length and I is the current in amperes. Since B is directly proportional to I, to decrease the magnetic field (in successive hysteresis loops), the current must be decreased too. You will learn more about this in A level physics!"

Feel free to drop us an email if you do not agree with any of our answers or if you need any clarifications.

## Tuesday, November 11, 2014

### Answers to 5116/ 5118 2014 O level Combined Science (Chemistry) Paper 1

All solutions/ answers to the 5116/ 5118 Science (Chemistry) MCQ paper are provided by teachers of Penciltutor School and the Singapore MOE or UCLES bears no responsibility for these suggested solutions/ answers. We are sorry that these solutions/ answers were not uploaded yesterday as one of our Chemistry teacher was away on medical leave.

Please leave a comment below or send an email to admin@penciltutor.com if you find any errors.

## Monday, November 10, 2014

### 2014 O level Science Physics 5116/ 5117 Paper 1 (MCQ) Suggested Answers/ Solutions

Solutions/ answers to the 2014 Science Physics 5116/ 5117 Paper 1 (MCQ) are provided by teachers of Penciltutor School and the Singapore MOE or UCLES bears no responsibility for these suggested solutions/ answers. If you find any errors in our solutions, kindly send an email to admin@penciltutor.com or please leave a comment. Answers to the Science (Chemistry) & (Biology) will be uploaded tomorrow. The answer to Q11 has been edited. The correct answer should be D (Thanks Sean Wang for pointing out the error!)

## Sunday, November 9, 2014

### 2014 O level Pure Physics 5059 Paper 1 (MCQ) Suggested Answers

Solutions/ answers to the 2014 Pure Physics 5059 Paper 1 (MCQ) are provided by teachers of Penciltutor School and the Singapore MOE or UCLES bears no responsibility for these suggested solutions/ answers. If you find any errors in our solutions, kindly send an email to admin@penciltutor.com.

If you have questions, please leave a comment

## Thursday, November 6, 2014

### 2014 O level POA 7092 (Principles of Accounts) Paper 2 Suggested Answers

The following solutions/ answers to the 2014 POA Paper 2 are provided by teachers of Penciltutor School and the Singapore MOE or UCLES bears no responsibility for these suggested solutions/ answers. If you find any errors in our solutions, kindly leave a comment or send an email to admin@penciltutor.com.

You may download the PDF version of the above solutions by clicking HERE

## Wednesday, October 29, 2014

### 2014 O level A Maths 4047 (Add Math, AMath, AMaths or Additional Mathematics) Paper 2 Suggested Answers

All solutions/ answers are provided by teachers of Penciltutor School and the Singapore MOE or UCLES bears no responsibility for these suggested solutions/ answers. If you find any errors in our solutions or if you want any explanation regarding the solutions, leave a comment or send an email to admin@penciltutor.com. Link to the 4038 A Maths solutions can be found at the end.

__Suggested Answers (Solutions) to 4047 Additional Mathematics (A Maths or Add Math) Paper 2 2014__
Answers to the 4038 A Maths paper can be found here

## Tuesday, October 28, 2014

### Answers to 5116/ 5118 2014 O level Combined Science (Chemistry) Paper 3

All solutions/ answers are provided by teachers of Penciltutor School and the Singapore MOE or UCLES bears no responsibility for these suggested solutions/ answers. The following answers are provided as a SUGGESTION BASED ON THE QUESTIONS SUBMITTED BY OUR STUDENTS. IT IS POSSIBLE THAT ALL THE FOLLOWING ANSWERS OR SUGGESTIONS ARE ALL WRONG! WE DID NOT HAVE ACCESS TO THE ACTUAL PAPER!

Please leave a comment if you find any errors or need any clarifications.

### 2014 O level A Maths (Add Math, AMath, AMaths or Additional Mathematics) Paper 1 Suggested Answers

All solutions/ answers are provided by teachers of Penciltutor School and the Singapore MOE or UCLES bears no responsibility for these suggested solutions/ answers. We have tried our best to be error-free but if you find any errors in our solutions or if you want any explanation regarding the solutions, leave a comment or send an email to admin@penciltutor.com.

__Suggested Answers (Solutions) to 4038 Additional Mathematics (A Maths or Add Math) Paper 1 2014__

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