MDCAT 2026 MCQs

Transformers use changing magnetic flux in coupled coils.
They ideally conserve power while changing voltage and current.

Use F=kq1q2/r² with charges in coulombs.
F=9×10^9×2×10^-6×3×10^-6 = 0.054 N.

Coulomb force varies inversely with distance squared.
Tripling distance multiplies force by 1/3² = 1/9.

Alkanes are saturated because they contain the maximum number of hydrogens.
Their general acyclic formula is CnH2n+2.

Resistance relates voltage and current through Ohm's law.
Its SI unit is the ohm.

Alkenes are unsaturated hydrocarbons.
Their double bond contains one sigma and one pi bond.

An ohmic conductor has V=IR under constant temperature and conditions.
Its V-I graph is linear through the origin.

Alkynes are unsaturated hydrocarbons.
The triple bond contains one sigma and two pi bonds.

Series resistors carry the same current.
The voltage drops add to the source voltage.

Each carbon in an alkane forms four bonds.
An open-chain saturated hydrocarbon follows CnH2n+2.

Parallel resistors share the same voltage.
The total resistance is less than the smallest branch resistance.

One double bond reduces hydrogen count by two relative to an alkane.
Thus the formula is CnH2n.