Skip to content
SANEDA
All samples

SAAT (English)

Physics: sample 13

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.

If a radioactive element has a mass of 12 g and a half-life of 25 days, after how many days will its mass reduce to 1.5 g?

  1. 50
  2. 75
  3. 100
  4. 125
Show answer

Correct answer: B. 75

Why

12 → 6 → 3 → 1.5 g takes 3 half-lives; 3 × 25 = 75 days.

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

Want to try questions under time? Take the free preview.