Explanation

For capacitors in series:  

1/Cₑq = 1/C₁ + 1/C₂ 

1/Cₑq = 1/4 + 1/4 = 2/4 = 1/2

Cₑq = 2 µF

Last verified on 11-04-2026

Explanation

• Sound travels in air at a moderate speed.
• At room temperature (about 20°C), it is around 340 m/s.
• This value can slightly change with temperature.

Last verified on 11-04-2026

Explanation

Momentum is the product of mass and velocity.

Formula: 𝑝 = 𝑚𝑣

Mass = 0.5 kg, Velocity = 4 m/s

So, momentum = 0.5 × 4 = 2.0 Ns

Last verified on 11-04-2026

Explanation

• Solids → fastest sound speed
• Liquids → medium speed
• Gases → slowest speed

Steel is more elastic and dense.

• Steel ≈ 5000 m/s
• Air ≈ 332 m/s
• Water ≈ 1500 m/s

Last verified on 11-04-2026

Explanation

• Boyle’s law explains the relationship between pressure and volume.
• At constant temperature, pressure is inversely proportional to volume.
• When pressure increases, volume decreases and vice versa.
• Boyle’s law: P ∝ 1/V
• Equation: PV = constant

Last verified on 11-04-2026

Explanation

• The rate of change of velocity is called acceleration.
• It shows how quickly velocity changes with time.
• Velocity may change in speed or direction.
• Displacement is change in position.
• Momentum depends on mass and velocity.

Last verified on 11-04-2026

Explanation

• Ionic bonding occurs between metals and non-metals.
• Potassium chloride (KCl) is formed from potassium (metal) and chlorine (non-metal), so it is ionic.
• Covalent bonding occurs between non-metal atoms.
• Methane (CH₄) is formed by sharing electrons, so it is covalent.

Last verified on 11-04-2026

Explanation

• Weak acids partially dissociate in water.
• They have a pH less than 7, usually around 4–6.
• A pH of 8–9 indicates a weak base, not an acid.
• Weak acids still react with bases and carbonates.
• Therefore, pH 8–9 is not a property of weak acids.

Last verified on 11-04-2026

Explanation

• Chemical equilibrium is a state where forward and backward reactions occur at the same rate.
• At equilibrium, concentrations of reactants and products remain constant.
• It occurs in a closed system.
• The equilibrium constant (Kc) remains constant, not increasing.
• Therefore, Kc increasing is not a feature of equilibrium.

Last verified on 11-04-2026

Explanation

• Titration is a method used to prepare soluble salts.
• It works when both acid and base are in solution form.
• A soluble acid reacts completely with a soluble base.
• This allows accurate measurement and neutralization.
• Therefore, both must be soluble for titration method.

Last verified on 11-04-2026