Are there elimination tricks for match-the-column questions, or do I have to know every pair?

5 answers & replies

• [+][–]CBCommons Biology DeskTeam· 11d ago

  Use anchors: pairs you are fully sure of. Work through a worked example.

  Column I: (a) Calcitonin, (b) Glucagon, (c) Cortisol, (d) Melatonin. Column II: (p) Pineal, (q) Adrenal cortex, (r) Thyroid, (s) Alpha cells of the pancreas.

  Options:

  1. a-r, b-s, c-q, d-p
  2. a-r, b-q, c-s, d-p
  3. a-s, b-r, c-p, d-q
  4. a-p, b-q, c-r, d-s

  Suppose you only know melatonin is from the pineal gland (d-p). Options 3 and 4 die. Calcitonin-thyroid (a-r) does not separate 1 and 2. But glucagon-alpha cells (b-s) leaves only option 1. Two pairs were enough.

  Start with the pair you are most certain of, not the first in the list.

  Report
• [+][–]CMCommons Mock & PYQ DeskTeam· 11d ago

  Some tactics from exam practice:

  • Scan the options first for what they disagree on. If three options agree on pair (a), that pair adds nothing. Spend your effort on the pairs where options differ.
  • Stop when one option remains. Do not verify the rest. That saves time.
  • Distrust the 70 percent pair. A match you feel mostly sure about is not an anchor. Use it only to break a tie.
  • Double-check the final survivor. Options are often built so that a near-miss differs from the answer by one swap.

  Time cap: if after a short look you have no anchor, mark it and move on. On review, note whether you lacked the facts or just the technique. Add your own tricks below if you have some.

  Report
• [+][–]CCCommons Chemistry DeskTeam· 10d ago

  Chemistry match questions often reward classification. Example: match the molecule with its shape (VSEPR, from Chemical Bonding).

  Molecule	Shape
  $\text{BF}_3$	Trigonal planar
  $\text{NH}_3$	Trigonal pyramidal
  $\text{SF}_6$	Octahedral

  If you know only that $\text{SF}_6$ is octahedral, the options with $\text{SF}_6$ elsewhere vanish.

  Physical chemistry gives clean anchors too. Units of the rate constant: zero order is $\text{mol L}^{-1}\text{s}^{-1}$, first order is $\text{s}^{-1}$, second order is $\text{L mol}^{-1}\text{s}^{-1}$. If a column pairs orders with units, one confident pair settles most of it.

  The trap: pairs that look alike (two similar reagents or two similar shapes). Slow down for those.

  Report
• [+][–]CPCommons Physics DeskTeam· 10d ago

  Use dimensions to anchor. Torque has dimensions $ML^2T^{-2}$, angular momentum $ML^2T^{-1}$, moment of inertia $ML^2$. All three look similar, but only one has the $T^{-2}$ factor, and only one has no time factor. So even if you forget a name, you can still sort them.

  For matching graphs to relationships: ask what each curve must do at zero and at large values. A straight line through the origin means direct proportion; a curve that falls steeply and flattens suggests an inverse relationship.

  Physics column questions often carry one pair with a clear signature. Find it first.

  Report
• [+][–]CSCommons Strategy DeskTeam· 10d ago

  Build the habit in revision, not in the exam. Make two-column flashcards for things that are naturally paired (scientist-discovery, hormone-gland, disease-organism, named reaction-reagent). Shuffle the right column and match them from memory, then check the ones you hesitated on.

  A pair that you can produce quickly is an anchor on exam day. A pair that took you ten seconds of thinking is not, so it goes back into the next revision round. Over a few weeks the set of instant pairs grows, and match-the-column questions start to feel like a short lookup instead of a puzzle.

  Report