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Heat capacity (o) = mass (kg) specific heat of a substance (C2) i.e Q = MC where Q = 40 J/L, m = ?(380 J/Kgk) 40 = m × 380 m = 0.11kg (Approx)

Using the equation S = ut + ½ gt2 H = s = 20m, t = ? G =10m/s2, u = 0m/s 20 = 0 × t × ½ × 10 t 20 = 5t i.e 5t2 = 20 t = 20/5 = 4 t = 4 (squaring both sides) √ t2 = √4 = 2sec ∴ t = 2sec

Velocity Ratio (V.R) = distance moved by the effort (x)÷ distance moved by the load (y) i.e. V.R = x/y v. R = 5, x/y = ? i.e x/y = 5/1; , where x = 5, y = 1 x : y = 5 : 1

Mechanical advantage (M.A) of a machine is the ratio of its load to effort Mathematically Mechanical advantage (M.A) = Load (L) ÷ Effort (E) In symbol M.A = L/E Note:Mechanical (advantages has no S.I unit) If M.A = 4 then, L/E = 4/1 The ratio of load to effort = 4 : 1 respectively

Gas thermometers are considered best for use to achieve an accurate temperature than others, such as liquid in glass thermometers such as mercury, clinical and alcohol thermometer

(Neglect of Air resistance) Note: Both objects reach the ground at the same time

M= 3kg, r = 0.7m, v = 2m/s v = wr w = angular velocity r = radius in an tangential circular v = speed of an object W = V/δ = 2/ 0.7 = 2.85 W = 2.853rads–1 (total interest whole number) W = &approx.; 3rads–1Angular velocity (w) = 3rads–1

Microscope is used for nearby object

Electron: A sub–atomic particle haring a negative charge and orbiting the nucleus (note: the symbol 0–1e represent the particle of an electrons.)

\(Wavelength (\lambda) = 10^{-13}m\) Speed of X-ray = speed of light \(C = 3\times10^{8}m/s\) Frequently (f) = ? \(Using V = f\lambda (or (– f \pi for electromagnetic wave)\) \(f = \frac{c}{\lambda} = 3 \times 10^{8} \div 10^{-13} = 3 \times 10^{8} \times 10^{13}\) = \(3 \times 10^{8} \times 10^{13}\) = \(3 \times 10^{21}Hz\)

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

The simplest way to change the boiling point of a liquid is to change the surrounding pressure. (a) Using a closed system to artificially increase that pressure will raise the boiling point of a liquid. (b) Boiling point is dependent upon the strength of the bonds between its molecules. For this reason, adding a solute to the liquid will create stronger bonds between molecules, raising the solution’s boiling point without increasing pressure.

Fig (I) (II) (III) are they in which a transformer was designed to reduce an energy loses by reducing through this collective designed or efforts

Mercury and alcohol are often used in THERMOMETER Note:Water is never allowed to be used in thermometer because, it doesn’t expand uniformly

Neutron were discovered by James Chadwick in 1931