Home work for Wednesday and Thursday

Subject: Computer Science

Grade 9:

Solve the following Past Question paper in your past paper Book

1) M/J/2017/22 (Section B)

2) M/J/2017/23 or 21 (Section B)

Grade 11:

Solve the following Past Question paper in your past paper Book

1) M/J/2016/22

2) M/J/2016/12

Grade 12:

Solve the following Past Question paper in your past paper Book

1) M/J/2015/32

2) M/J/2015/33

9702/41/O/N/13 © UCLES 2013

ForExaminer’s

Usespeed v.

It enters a uniform magnetic field of flux density B. The initial angle between the direction of motion of the particle and the direction of the magnetic field is 90°.

(a) Explain why the path of the particle in the magnetic field is the arc of a circle.

..........................................................................................................................................

..........................................................................................................................................

..........................................................................................................................................

(b) The radius of the arc in (a) is r.

Show that the ratio qm for the particle is given by the expression

qm

= vBr

.

[1]

(c) The initial speed v of the particle is 2.0 × 107 m s–1. The magnetic flux density B is 2.5 × 10–3 T.

The radius r of the arc in the magnetic field is 4.5 cm.

(i) Use these data to calculate the ratio qm.

ratio = ...................................... C kg–1 [2]

Physics Worksheet-1Class: A

CIDER International School

Marks: 25

Date:..................................Name:......................................................................................................

1 A charged particle of mass m and charge –q is travelling through a vacuum at constant

...................................................................................................................................... [2]

9702/41/O/N/13 © UCLES 2013[Turn over

ForExaminer’s

Use

(ii) The path of the negatively-charged particle before it enters the magnetic field is shown in Fig. 6.1.

path ofparticle

magnetic field intoplane of paper

Fig. 6.1

The direction of the magnetic field is into the plane of the paper.

On Fig. 6.1, sketch the path of the particle in the magnetic field and as it emerges from the field. [2]

12

9702/43/O/N/13 © UCLES 2013

ForExaminer’s

Useshown in Fig. 5.1.

P

Q

S

R

magnetic fieldflux density B

Fig. 5.1

The plane PQRS has area A.

(a) State

(i) what is meant by a magnetic field,

..................................................................................................................................

.............................................................................................................................. [1]

(ii) an expression, in terms of A, B and θ, for the magnetic flux Φ through the plane PQRS.

.............................................................................................................................. [1]

(b) A vertical aluminium window frame DEFG has width 52 cm and length 95 cm, as shown in Fig. 5.2.

hinge

hinge

52 cm

D

G

E

F

95 cm

Fig. 5.2

The frame is hinged along the vertical edge DG. The horizontal component BH of the Earth’s magnetic field is 1.8 × 10–5 T. For the closed

window, the frame is normal to the horizontal component BH. The window is opened so that the plane of the window rotates through 90°.

2 A uniform magnetic field of flux density B makes an angle θ with a flat plane PQRS, as

9702/43/O/N/13 © UCLES 2013[Turn over

ForExaminer’s

Use

(i) Explain why, when the window is opened, the change in magnetic flux linkage due to the vertical component of the Earth’s magnetic field is zero.

..................................................................................................................................

.............................................................................................................................. [1]

(ii) Calculate, for the window opening through an angle of 90°, the change in magnetic flux linkage.

change in flux linkage = .......................................... Wb [2]

(c) (i) State Faraday’s law of electromagnetic induction.

..................................................................................................................................

..................................................................................................................................

.............................................................................................................................. [2]

(ii) The window in (b) is opened in a time of 0.30 s. Use your answer in (b)(ii) to calculate the average e.m.f. induced in the window

frame.

e.m.f. = ............................................. V [1]

(iii) State the sides of the window frame between which the e.m.f. is induced.

between side ............ and side .............. [1]

9702/43/O/N/13 © UCLES 2013

ForExaminer’s

Use The initial direction of travel is parallel to the plane of two charged horizontal metal plates, as

shown in Fig. 6.1.

+ V

path of particle

metal plate

metal plate

Fig. 6.1

The uniform electric field between the plates has magnitude 2.8 × 104 V m–1 and is zero outside the plates.

The particle passes between the plates and emerges beyond them, as illustrated in Fig. 6.1.

(a) Explain why the path of the particle in the electric field is not an arc of a circle.

..........................................................................................................................................

..........................................................................................................................................

...................................................................................................................................... [1]

(b) A uniform magnetic field is now formed in the region between the metal plates. The magnetic field strength is adjusted so that the positively charged particle passes undeviated between the plates, as shown in Fig. 6.2.

+ V

path of particle path of particle

region of uniformelectric and magneticfields

Fig. 6.2

3 A particle has mass m and charge +q and is travelling with speed v through a vacuum.

9702/43/O/N/13 © UCLES 2013[Turn over

ForExaminer’s

Use

(i) State and explain the direction of the magnetic field.

..................................................................................................................................

..................................................................................................................................

.............................................................................................................................. [2]

(ii) The particle has speed 4.7 × 105 m s–1. Calculate the magnitude of the magnetic flux density. Explain your working.

magnetic fl ux density = ............................................. T [3]

(c) The particle in (b) has mass m, charge +q and speed v. Without any further calculation, state the effect, if any, on the path of a particle that has

(i) mass m, charge –q and speed v,

.............................................................................................................................. [1]

(ii) mass m, charge +q and speed 2v,

.............................................................................................................................. [1]

(iii) mass 2m, charge +q and speed v.

.............................................................................................................................. [1]

Worksheet no. 1

CLASS: XII

SUBJECT: ACCOUNTING Name: ................................................................................................................... Sec: ...........

L plc is a manufacturing business. The total prime cost for the year ended 31 December 2017 was

$350 000. The following selected balances were extracted from the company’s books of account at

31 December 2018.

$000 Indirect wages

General expenses

Power

Factory plant: Cost

100

64

36

600

: Accumulated depreciation at 1 January 2018 150

Inventory:

Work in progress at 1 January 2018 23

The following information is available at 31 December 2018.

1. The prime cost for the year was 10% greater than the previous year.

2. Indirect wages are to be apportioned between the factory and office in the ratio 2 :3 respectively.

3. General expenses of $6000 were prepaid. General expenses are to be apportioned equally

between the factory and the office.

4. A power bill of $4000 remained unpaid. 60% of the total power expense is charged to the factory.

5. The value of work in progress was $31 000.

The following information is also available for the year ended 31 December 2018.

1. A new item of factory plant was acquired on 31 October 2018 at a cost of $30 000. This

transaction has not been recorded in the books of account.

Factory plant is depreciated at 25% per annum using the reducing balance method. A full year’s

depreciation is charged on assets acquired during the year.

2. Goods are transferred to the sales department at a mark-up of 20%.

Answer the following questions:

a) Explain what is meant by:

(i) prime cost

(ii) work in progress.

(b) Prepare the manufacturing account for the year ended 31 December 2018.

Class –XII, Session: 2019-20, Subject: Economics Worksheet 1, Marks: 30, Time: 1 hrs.

Name: …………………………………………Sec:………..Date: 16/3/20 1 Small and Medium Enterprises in Malaysia

Malaysia has a market-orientated economy and the political stability that is crucial for investors. It also has a well-developed infrastructure, a productive workforce and prices are still competitive. Small and medium sized enterprises (SMEs) are very important in Malaysia. In the manufacturing sector SMEs are those enterprises which have fewer than 150 full-time employees and in the services sector SMEs are those which have fewer than 50 full-time employees. SMEs provide employment for about 56% of the country’s workforce. They contribute 43.5% of the value of Malaysia’s output and 19% of the value of its exports. Table 1 and Table 2 provide further information about the contribution of SMEs to the Malaysian economy. Table 1: % Distribution of Enterprises in Malaysia by Sector

Table 2: Value of Output by Sector in US$

SMEs are recognised as an important source of economic growth and their development has been given priority by the government. 72% of government development programmes, worth US$178 million, were provided for SMEs in 2008. A further US$156 million was provided in 2009. With these funds, the government has introduced several programmes for SMEs including the provision of loans, technical advice and information on prices, production and technology. Government programmes also help producers identify the products markets require and understand changes in consumer tastes. The aim of the programmes is to encourage a better performance from SMEs. Initially, Malaysia protected local enterprises. However, realising the huge potential that foreign investment could bring, government policy has changed and now encourages programmes that welcome more direct foreign investment.

(a) The article begins by stating that Malaysia is a market-orientated economy. Identify evidence in the article that (i) supports this opinion; and (ii) contradicts this opinion. [4] (b) State two indicators which can be used to measure the performance of firms. [2] (c) The article states that the aim of the government programmes is to encourage a better performance from SMEs. Discuss how two of the government policies mentioned might be used to encourage a better performance from SMEs. [6] (d) The article says that the development of SMEs has been given government priority as they are important to the economy. How far does the information support this statement? [8] Class –XII, Session: 2019-20, Subject: Economics

Worksheet 2, Marks: 50, Time: 1:20 hrs. Name: …………………………………………Sec:………..Date: 16/3/20 1 When buying goods not everyone buys the same standard product. There are some who want a cheap product even though it might be of poor quality, while there are those who are willing to pay more for a luxury or an individually-made product. Customers search for value but value is not just in the price. (adapted from New York Times in the Observer 21.02.10) (a) Explain the theoretical link between utility, price and the demand for a product. [12] (b) Discuss whether the economic analysis of a rational consumer estimating demand based on value (utility) is valid not only for standard products but also for poor quality and luxury products. [13] 3 (a) Explain why there may be different levels of profit within perfect competition and between perfect competition and monopoly. [12] (b) Discuss whether the average variable cost has any significance in a perfectly competitive market structure in determining (i) the output produced by a firm and (ii) the profit of a firm. [13]