Question Library

30 - x + x + 40 - x = 80 - 20 70 - x = 60 - x = 60 - 70 - x = - 10 ∴ x = 10 Music only = 30 - x = 30 - 10 20 P(music only) = 20/80 = 1/4 = 0.25

m = \(\frac{y_2 - y_1}{x_2 - x_1} = \frac{2 - 0}{0 - (4)} = \frac{2}{4} = \frac{1}{2}\) \(\frac{y_2 - y_1}{x_2 - x_1} \geq m\) \(\frac{y - 0}{x + 4} \geq \frac{1}{2}\) 2y \(\geq\) x + 4, -x + 2y \(\geq\) 4 = px + qy \(\geq\) 4 p = -1, q = 2

Area of a square = L X L = 81 : L = 9 Perimeter of square = 4 X L 4 X 9 = 36cm An equilateral triangle with equal sides: 36/3 = 12cm

Mean of 1.20, 1.00, 0.90, 1.40, 0.80, 0.80, 1.20 and 1.10 → \(\frac{8.4}{8}\) = 1.05 → p Range = 1.40 - 0.80 = 0.60 → q p \div q = 1.05 \div 0.60 = 1.75

The kinetic theory of matter (particle theory) says that all matter consists of many, very small particles which are constantly moving or in a continual state of motion.

V\(_e\) = \(\sqrt{2gr}\) V\(_e\) = \(\sqrt{2 \times 10 \times 6.4 \times 10^6}\) = 11.313km/s The escape speed from Earth's surface is about 11.186 km/s

The galvanometer possesses a rectangular coil mounted on a soft iron core rotating on a magnetic field induced by a permanent magnet.

Q = charge i = current t = time in sec Mass(M1) 3hours to sec 60*60*3= 10800 Mass(M2) 10hours to sec 60*60*10 = 36,000 36,000 * 3.0A = 108,000 if it takes 10800 current to discharge 1g how much will it take 108000 10800---->1 108000---x = 108000/10800 =10

XL = \(\frac{V}{I} = \frac{240}{2} = 120\Omega\) L = \(\frac{X_L}{2 \pi f}\) = \(\frac{120 \times \pi}{2 \times \pi \times 100}\) = 0.6H

Given that W = -\(\frac{R}{n^2}\) from n = 3 to n = 2. -\(\frac{R}{3^2}\) - (-\(\frac{R}{2^2}\)) -\(\frac{R}{9}\) - (-\(\frac{R}{4}\)) -\(\frac{R}{9}\) + \(\frac{R}{4}\); with LCM 36 \(\frac{-4R + 9R}{36}\) = \(\frac{5R}{36}\)

violet color will deviate the most. Red light shows the least amount of deviation

A strong base is one that fully dissociates to give ions in solution. Weak bases only partially dissociate in a solution, while the strong bases dissociate fully in a solution. Weak bases have pH 7.3 – 10, strong ones have pH 10 – 14.

So we can determine that the basicity of Acetic acid is 1 because it releases one hydrogen ion in an aqueous solution. Due to this they act as very weak acids. When weak acid reacts with strong base, they tend to form normal salt.