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SAAT (English)

Physics: sample 4

These questions are ETEC/Qiyas's own officially published trial-exam questions, shown here with attribution. They are not sold and are not part of Smart Advanced Network for Education, Development & Achievement's original question bank.
Directions

Read the following questions. Choose the right answer.

There is only ONE correct answer to each question.

[Figure: a bridge circuit with resistors 8Ω and 6Ω on one side and 3Ω and unknown R on the other, with a galvanometer G across the bridge.] In the figure, if the circuit is at equilibrium, what is the value of resistance R, in Ω?

  1. 2
  2. 3
  3. 4
  4. 16
Show answer

Correct answer: C. 4

Why

For a balanced (equilibrium) Wheatstone-bridge-style circuit, the ratio of resistors on each side must match: R/8 = 3/6, so R = 8×3/6 = 4.

Source: The Standardized Academic Achievement Test (SAAT) for the Science Track Trial Test (ETEC official) Open the official document

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