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BMAT difficult questions And Answers 2022/2023

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The graphs of the following equations are drawn: 1. y = 3x - 2 2. y = x^2 3. y = 1 - x^2 4. y = x + 6 3 and 4 An ore of lead contains 70 % of PbS. Calculate the mass of lead that can be e ... xtracted from 478k of the ore. (Ar: Pb = 207; S = 32) A - 28.98kg B - 41.4 kg C - 144.9 kg D - 289.8 kg E - 414.00kg Answer: 478 x 0.7 = 334.6 mass of PbS 334.6 / (207+32) = 1.4 = no. of moles of PbS 1.4 x 207 = 289.8 kg = mass of lead Therefore D is the answer. The energy in joules (E) associated with a photon of radiation is related to its frequency in hertz (f) by the equation: f = E / h where h is a constant (6.63 x 10^-34). What is the energy of a photon of radiation if 5 waves of this radiation are produced in 1 x 10^-13 seconds? A 1.33 x 10^-21J B - 6.63 x 10^-21 J C - 3.32 x 10^-20 J D - 1.51 x 10 ^46 J E - 7.54 x 10^46 J Calculate the frequency: Frequency = 1 / period. The period is the time taken for one wave to take place. If 5 waves take place in 1 x 10^-13 seconds, then 1 wave would take place in (1 x 10^-13) / 5 seconds = 2 x 10^-14 seconds. So the frequency = 1 / 2 x 10^-14 = 0.5 x 10^14 = 5 x 10^13. E = 5 x 10^13 x 6.63 x 10^-34 = 3 something ^- something. The best answer choice would therefore be C. The book says: F = no. of vibrations / time so f = 5 / 1 x 10^-13 tip Check workds like must of may very carefully. These are often, but not always, shown in bold type. The sum of the roots of a quadratic equation is 7, the product of the roots is 9. What is the equation? x^2 - 7x + 9 = 0 The roots are the solutions of the equation. We don't know what the roots are, so we call them a and b. SO when we factorise the quadratic equation it looks like: (x - a)(x - b) = 0 Multiplying out the brackets: x^2 - ax - bx + ab = 0 x^2 - (a +b)x + ab = 0 From the question we know that: a + b = 7 ab = 9 and substituting these into the quadratic equation: x^2 - 7x + 9 =0 What is the symbol for a diode? what is an integer? and give some examples. A whole number. 1, -1, 0. w < x^2, x > y^2, y^2 < z^2 and x > z Which of the following must be true? A - w < x B - w > y C - w < z D x > y E y < z D cos it's an INTEGER!!! A bullet of mass 50 g is fired from a rifle with a velocity of 300 m/s. It hits a bank of earth and after travelling 60cm into the bank comes to rest. What is the average stopping force of the earth in the bank on the bullet? Force = change in momentum / time taken. Initial momentum = 50 x 300 / 1000 = 15 kgm/s Therefore change in momentum = 15kgm/s Use SUVAT to calculate time taken. s = (u+v)/2 x t so 0.6 m = 150m/s x t therefore t = 0.6 m / 150 m/s = 4 x 10^-3 So: Force = 15 kgm/s divided by 4 x 10^-3 = 3.75 x 10^3 N. Which graph correctly shows how the resistance (R) varies with applied voltage (V) for a resistor at constant temperature? It would be one with a straight line because... The resistance of a resistor is constant - only current would change. Resistance only changes slightly with temperature. [Show More]

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