Question Library

More collisions mean more force, so the pressure will increase. When the volume decreases, the pressure increases. This shows that the pressure of a gas is inversely proportional to its volume. This is shown by Boyle's law.

Heat involved (H) = 88,000J, Mass(M)= 0.5kg, specific heat capacity of water(C) = 4200JkgºC, Specific latent heat of fusion(L) = ?, Temperature change(\Delta\theta) = \theta2 - \theta1 = (10 - 0)^\circ = 10^\circ H = MC\Delta\theta + ML or H = M(C\Delta\theta + L) -->\(\frac{H}{M}\) = C\Delta\theta + L : L = \(\frac{H}{M}\) - C\Delta\theta = \(\frac{88,000}{0.5}\) - 4200 \(\times\) 10 L = 176,000 - 42000 = 134,000 L = 134,000 or 134kj/kg

H = mc\(\bigtriangleup\theta\) + mL H = ? m = 50g, c = 4.23J/gk,L = 2260, \(\bigtriangleup\theta\) = 80ºC H = 50 [4.23 x 80 + 2260] = 129920 \(\approx\) 130,000J

Using the law of conservation of energy mc\(\bigtriangleup\theta\) = mgh \(\bigtriangleup\theta\) = \(\frac{gh}{c} = \frac{10 \times 20}{450} = \frac{4}{9}\)ºC

A hygrometer is an instrument that is used to measure water vapor in the atmosphere. This is also commonly referred to as relative humidity in the atmosphere.

The boiling point of a liquid depends on temperature, atmospheric pressure, and the vapor pressure of the liquid. When the atmospheric pressure is equal to the vapor pressure of the liquid, boiling will begin

OPTION B is the correct answer because gravitational force is inversely proportional to the square of distance between the two bodies according to Newton's law of universal gravitation. \( F_g = G\frac{m_1m_2}{r^2}\)

An electric motor is an electrical machine that converts electrical energy into mechanical energy.

Power[p] = IV → 2 * 440 = 880Watt Energy = p * t = 880 * 48hrs = 42240 or 42.24kwh But 1 kwh cost $0.40 ∴ 42.24kwh costs 42.24 x 0.40 = 16.896 or $16.90

Given; L = 2H F = \(\frac{50}{\pi}\) \(H_2\) \(X_L\) = ? \(X_L\) = 2\(\pi\)fL = 2\(\pi\) x \(\frac{50}{\lambda}\) x 2 = 200\(\Omega\)

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

Capacitive reactance, X\(_C\) = \(\frac{1}{2\piFC}\) → \(\frac{1}{2\pi * 500/\pi * 5 * 10^{-6}}\) = \(\frac{1}{0.005}\) → 200\Omega

Given f = 1.6 x10\(^{16}\)\(H_3\), h = 6.63 x 10\(^{-39}\)Js e = 1.6 x 10\(^{-19}\)C, V = ? V = \(\frac{w}{e} = \frac{hf}{e}\) = \(\frac{1.6 \times 10^{16} \times 6.63 \times 10^{34}}{1.6 \times 10^{-19}}\) = 66.3V

Both the electric field and magnetic field affect the \beta-particles.

Alpha decay or \alpha-decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle (helium nucleus) and thereby transforms or 'decays' into a different atomic nucleus, with a mass number that is reduced by four and an atomic number that is reduced by two.