BMAT Knowledge 5

Question 1

What is the molar mass of calcium carbonate (CaCO₃)?

Accepted Answer

100 g/mol

Answer

Molar mass = Ca(40) + C(12) + 3×O(16) = 40 + 12 + 48 = 100 g/mol.

Question 2

In a parallel circuit with two identical 10 Ω resistors connected to a 20 V supply, what is the total current drawn?

Accepted Answer

4 A

Answer

Two 10 Ω resistors in parallel give total resistance 5 Ω; total current = V/R = 20/5 = 4 A.

Question 3

Which hormone is secreted by the pancreas to lower blood glucose levels?

Accepted Answer

Insulin

Answer

Insulin is released by beta cells of the pancreas and stimulates cells to absorb glucose from the bloodstream.

Question 4

A car decelerates uniformly from 30 m/s to rest over 150 m. What is its deceleration?

Accepted Answer

3 m/s²

Answer

Using v² = u² + 2as: 0 = 900 + 2a(150), so a = −3 m/s², deceleration = 3 m/s².

Question 5

In the reaction CH₄ + 2O₂ → CO₂ + 2H₂O, methane is acting as a:

Accepted Answer

Reducing agent

Answer

Methane is oxidised (carbon goes from −4 to +4), so it acts as the reducing agent by donating electrons.

BMAT - Assessment Practice Test