TLDR;
This video provides key answers and explanations for a B1 paper, covering IT skills (questions 1-10 and 91-100), FEEE (11-30), PMS (31-50), Maths (51-70), and SND (71-90). The speaker goes through each question, providing the correct option and explaining the reasoning behind it, including formulas and concepts used. The video aims to help students check their answers and understand the solutions.
- Key answers and explanations for B1 paper.
- Covers IT skills, FEEE, PMS, Maths, and SND sections.
- Includes formulas and concepts used in solutions.
IT Skills: Questions 1-10 [1:30]
The speaker begins by providing the answers for the first 10 questions related to IT skills. For question 1, the answer is option 3. Question 2, the answer is option 1. Questions 3 and 4, the answer is option 4. Question 5, the answer is option 2. Questions 6 and 7, the answer is option 2. Question 8, the answer is option 3. Question 9, the answer is option 3. Question 10, the answer is option 4.
FEEE: Questions 11-17 [2:12]
Moving on to the FEEE section, the speaker addresses questions 11 through 17. The material used for fire extinguishers (question 11) is option 4, Nitro-Zand barathe. Galvanized iron barathe (question 12) is option 4. For question 13, the conventional source of electrical energy is thermal energy. Question 14 involves matching items, with the correct option being 2, which includes only A and B. This is because current is measured in amperes, EMF in volts, electrical energy in kilowatt-hours, and resistance in ohms. Questions 15, 16 and 17 are about matching potential difference with voltmeter, power with watt, and resistance with ohmmeter.
FEEE: Questions 18-20 [3:47]
The speaker continues with questions 18, 19, and 20 from the FEEE section. The function of a fuse wire (question 18) is option 3, covering both A and B, which relates to protection circuits under voltage and over voltage. The rating of a fuse wire (question 19) is the maximum current at which the fuse burns, corresponding to option A. Question 20 involves matching different types of fuses with their applications: glass cartridge fuse for electronic equipment, KitKat fuse for residential wiring, HRC fuse for power distribution, and fuse wire for emergency protection. The correct option is 2.
FEEE: Questions 21-27 [4:45]
The discussion proceeds to questions 21 through 27. N1 represents the primary turn, and N2 represents the secondary winding (question 21), making option 1 correct. For an auto transformer (question 22), N1 is equal to N2, indicating isolation. In a step-up transformer, N1 is less than N2 (question 23). For a step-down transformer, N1 is greater than N2. Question 24 identifies properties of an ideal transformer, noting no winding resistance, no leakage flux, and no iron losses, making option 1 correct. Question 25 refers to the formula N2/N1 = V2/V1. Question 26 involves a calculation using the transformer formula, with the answer being option 3. The principle behind a transformer (question 27) is Faraday's law, making option 2 correct.
FEEE: Questions 28-30 [6:15]
The speaker addresses the final questions in the FEEE section. The capacity of a battery (question 28) is primarily measured in ampere-hours. Question 29 is about rectifier, with option 2 being the correct answer. CPU, RAM, and ROM (question 30) are all micro controls, making option 4 correct.
PMS: Questions 31-40 [7:05]
The speaker transitions to the PMS section, covering questions 31 to 40. Question 31 is an analogy type, with option 1 being the correct answer. The answers for the subsequent questions are as follows: 32 - option 3, 33 - option 1, 34 - option 2 (rework), 35 - option 1, 36 - option 4, 37 - option 3 (project manager), 38 - option 3, 39 - option 1 (uncertainty), and 40 - option 2 (critical).
PMS: Questions 41-50 [7:54]
The speaker continues with the PMS section, providing answers for questions 41 through 50. The answers are as follows: 41 - option 2, 42 - option 3, 43 - option 3 (both 1 and 2), 44 - option 2 (network technique), 45 - option 1, 46 - option 3, 47 - option 3 (post audit), 48 - option 2 (PERT), 49 - option 1, and 50 - option 4.
Maths: Questions 51-60 [8:54]
The speaker moves to the Maths section, starting with question 51. For a square matrix with diagonal elements 1, 5, and 9, the answer is option 3. The value of sin²x + cos²x (question 52) is 1, making option 3 correct. Question 53 involves a square matrix and its adjoint, with the answer being option 1. The minor (question 54) is option 2, resulting in -42 - 19.
Maths: Questions 61-70 [9:43]
Continuing with the Maths section, the speaker provides answers and explanations for questions 61-70. Question 61 involves substituting points to find lambda, with option 3 being the correct answer (-3). The slope (m) in question 62 is calculated as -a/b, resulting in 4/3, which corresponds to option A. For a line parallel to the y-axis (question 63), the slope is infinity, making option 2 correct. Question 64 involves an inclination of 135 degrees, leading to option 2 as the answer. In question 65, the y-intercept (c) is 4, and using the equation y = mx + c, the answer can be found. Question 66 involves the product rule, resulting in 2 divided by 1 - x². Question 67 requires finding the derivative of e to the power of x, with the answer being e to the power of x multiplied by -sin x + cos x. Question 68 involves composite successive derivatives, leading to option 2. Question 69 deals with the rate of change of area, with the area being πr², and differentiating it gives 2πr, making option 1 correct. Question 70 involves integration, where the integral of e to the power of x is e to the power of x, and the integral of 1/x is log x.
Maths: Questions 71-77 [11:37]
The speaker continues with the Maths section. The integral of sec²x (question 71) is tan x, making option 3 correct. For question 72, substituting sec²x = t and integrating t to the power of 6 results in option 3. Question 73 involves integrating x cos x, using integration by parts, with option 2 being the correct answer (x sin x + cos x). Question 74 refers to the highlight formula used in integration by parts, with the answer being 2. Question 75 involves integration, with the answer being generated by the integration. Question 76 involves integration with limits, and the answer can be found by solving the integral with the given limits. Question 77 involves finding the value of sin 480, which simplifies to sin 60, making option 1 correct.
Maths: Questions 78-80 [12:57]
The speaker continues with the Maths section, focusing on trigonometric identities. Question 78 involves the sin(a + b) formula, which is sin a cos b + cos a sin b, making option 2 correct. Question 79 involves using Pythagorean triplets to calculate sin a and cos b, and then substituting these values. Question 80 involves applying the cos(a - b) formula, which is cos a cos b + sin a sin b.
Maths: Questions 81-87 [13:55]
The speaker continues with the Maths section, focusing on trigonometric identities and allied angles. Question 81 involves simplifying sin 125, which can be written as sin(180 - 55), which equals sin 55. The answer is option 2, cos² 35. The speaker emphasizes that these questions are application-level but easy if the concepts are understood.
SND: Questions 71-80 [14:51]
The speaker transitions to the SND section, covering questions 71 to 80. The answers are as follows: 71 - option 2, 72 - option 3, 73 - option 3, 74 - option 2, 75 - option 4 (answer 17), 76 - option 1.
SND: Questions 81-90 [15:24]
The speaker continues with the SND section, providing answers for the remaining questions. The answers are as follows: 80 - option 3, 81 - option 2 (indentation defines the block of code), 82 - nested for loop, 83 - option 3 (output is 1), 84 - option 3, 85 - option 1 (B is the option 0), 86 - option 2, 87 - option 3, 88 - option 2.
IT Skills: Questions 91-100 [18:22]
The speaker concludes by addressing the remaining IT skills questions, 91 to 100. The answers are as follows: 91 - option 2, 92 - option 2 (135), 93 - option 4, 94 - option 2, 95 - option 2, 96 - option 3.
