Question Library

Energy = \(\frac{1}{2}\)CV2 = \(\frac{1}{2}\) x 8 x 10-6 x (100)2 = 4 x 10-2J

P1 = \(\frac{V^2_1}{R_1}\) and P2 = \(\frac{V^2_2}{R_2}\) P1R1 = P2R2 4P1 = 5P2 \(\frac{p_1}{p_2}\) = \(\frac{5}{4}\) = 5 : 4

Diaphragm: Found in both the receiver and the microphone; it vibrates to convert sound waves into electrical signals in the microphone and back into sound in the receiver. Soft iron pole pieces: Used in microphones to direct the magnetic field, but not found in the receiver. Permanent magnet: Present in the receiver, where it converts electrical signals back into sound, but not found in carbon microphones. Carbon blocks: These are used in carbon microphones to convert sound into electrical signals; they are not found in the receiver. In a telephone handset, the following components are found in the receiver but not in the microphone: ii. Soft iron pole pieces iii. Permanent magnet

When currents flow in the same direction in two parallel conductors, they generate magnetic fields that interact to produce an attractive force between them. Conversely, if the currents flow in opposite directions, the conductors will repel each other.

\(^{235}_{92}U\) \(\to\) 4\((^{4}_{2}\alpha)\) + 3\((^{0}_{-1}e)\) + \(^{b}_{a}y\) a + (4 + 2) + (3x - 1) = 92 \(\Rightarrow\) a = 87 b + (4 x 4) + (3 x 0) = 235 \(\Rightarrow\) b = 219 \(^{b}_{a}Y\) = \(^{219}_{87}Y\)

No expanded working has been attached for this question yet. The verified answer is Option B.

No expanded working has been attached for this question yet. The verified answer is Option B.

No expanded working has been attached for this question yet. The verified answer is Option A.

No expanded working has been attached for this question yet. The verified answer is Option A.

No expanded working has been attached for this question yet. The verified answer is Option D.

The passage clearly states that developing countries have: a modern sector (similar to developed countries), and a non-modern sector (unsatisfactory and worsening conditions) This shows a dual or conflicting structure within developing countries. In contrast, developed countries are implied to have a more uniform and advanced system, not divided into such contrasting sectors.

No expanded working has been attached for this question yet. The verified answer is Option C.

From the passage, one could conclude that the poor have no hope. The passage describes the typical condition of the poor in developing countries as one of limited work opportunities, under-employment or unemployment, low productivity, lack of access to land, mass migration to cities and ultimately a lack of hope in both rural and urban areas. The passage emphasises the dire situation faced by the poor and how they often have no prospects for improving their circumstances and that their chances of finding work are slim. This suggests a sense of hopelessness among the poor and this makes option B ("The poor have no hope") the most fitting conclusion based on the information provided.

The phrase “literally millions of workplaces” is used to emphasise the huge number of jobs needed in developing countries. The writer is stressing the scale and urgency of the problem. He wants the reader to understand that a very large number of workplaces are required, not necessarily to count an exact million. So, the phrase helps the reader appreciate how many workplaces are needed.

No expanded working has been attached for this question yet. The verified answer is Option D.