Single correct option
The first and last sentences are given. Choose the correct order of P, Q, R, S.
1. A lighthouse beam must be visible from far out at sea.
P. A powerful lamp is placed at the centre of a large lens.
Q. The lens bends the light into a single concentrated beam.
R. The whole lens then rotates, sweeping the beam across the water.
S. This makes the light flash at regular intervals that sailors can identify.
6. Each lighthouse therefore has its own signature pattern.
1. A lighthouse beam must be visible from far out at sea.
P. A powerful lamp is placed at the centre of a large lens.
Q. The lens bends the light into a single concentrated beam.
R. The whole lens then rotates, sweeping the beam across the water.
S. This makes the light flash at regular intervals that sailors can identify.
6. Each lighthouse therefore has its own signature pattern.
- A. PQRS
- B. QPRS
- C. PRQS
- D. SPQR
Show answer and solution
Answer: (A) PQRS
The process starts with the lamp (P), the lens concentrates its light (Q), the lens rotates (R), and the rotation causes regular flashes (S). 'This' in S refers to the sweeping, so S cannot come earlier, and Q needs P to introduce the lens. Look for pronouns, connectors and time words that link a sentence to the one before it; they reveal the logical chain that holds the paragraph together.
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