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

Beat = f2 - f1 = 270 - 258 = 12Hz

Materials used to demonstrate Brownian motion are: Pollen grains, dust particles, smoke particles, potassium permanganate cystals, carbon particles, etc.

The cathode ray tube components are: X = Filament or heater or cathode Y = Anode Z = Plates or deflectors.

S/N E/v I/A V/V \(\frac{1}{V}\)/V\(^{1}\) l\(^{-1}\)/A\(^{-1}\) 1 1.5 0.30 0.80 1.250 3.333 2 3.0 0.50 0.40 0.717 2.000 3 4.5 0.70 2.00 0.500 1.429 4 6.0 0.90 2.50 0.400 1.111 5 7.5 1.10 3.00 0.333 0.909 Slope = \(\frac{\bigtriangleup {V}^{-1}}{\bigtriangleup {I}^{-1}}\) = \(\frac{V_{2}^{-1} - V_{1}^{-1}}{I_{2}^{-1} - I_{1}^{-1}}\) = \(\frac{3.333 - 0.800}{1.24 - 0.26}\) = \(\frac{2.53}{0.98}\) = 2.6 Intercept C = 0.04 Precaution; - Ensured clean terminals/tight connections - Key removed after taking each reading/key removed - when reading was not being taken. - Avoided parallax error on Voltmeter/Ammeter Noted/corrected zero error on voltmeter/ammeter - Repeated readings (shown on the table) (b) Production of electric current e.g. use of - Cells (accumulators/simple cells) fuel cells (chemical energy) - Generators/dynamos/electromagnetic induction (mechanical) - Solar cells/photocells - Windmills - Tidal waves - Geothemal/thermal - Gas turbines - Hydro power - Nuclear power - Thermocouple/thermopile/themionic (heat energy) - Piezo electric generators - Electrostatic generator (e.g Van de graff generator) ii. \(\frac{1}{Re}\) = \(\frac{1}{R1} + \frac{1}{R2}\) = \(\frac{1}{R} + \frac{1}{R} = \frac{2}{R}\) Re = \(\frac{R}{2}\) RT = \(\frac{R}{2}\) + 2 = 4 \(\frac{R}{2}\) = 4 - 2 = 2 R = 4\(\Omega\)

XL = WL = 2πFL (w = 2πf) XL = reactance inductor (S.I unit Ω) L = inductance (L) in Henry XL = 1Ω, f = 50/π, L = ? 1 = 2× π × 50/π × L 1 = 100L i.e. 100L = 1 L = 1/100 0.01H ∴ Inductance (L) of a inductor = 0.01H

Note:The principle of floatation states that a floating body displaces its own weight of the fluid or which its float. For object to sink weight of the object (W) > upthrust of the fluid (v) i.e. w > u (i.e. weight of the body (or object) mass of the fluid)

Sun are self luminous source Moon is a non – luminous

A vector quantity has both magnitude and direction

J.J. Thompson discovered ELECTRONS

Vernier calliper is used to measure the internal and external diameter of an object

Note: T = 273 + θ θ = 45° T = 273 + 45 = 318K

Calorimeter is an apparatuses used for measuring the heat (Q) generated or absorbed by change of phase (state) or other physical change

Lodestone is a natural magnet it points approximate at N – S when suspended freely

From S = ut + ½gt2 u = 0ms-1 50 = (0 × t) + ½(10)(t2) 50 = 5.0t2 t2 =50/5 t = √10 t = 3.2sec