2 previous year UPSC Prelims questions on Chemistry: Physical Chemistry (Science and Technology). Choose an option to see the answer and explanation.
Explanations state facts as of the year each question was asked; words like “recently” refer to that year.
Showing 1–2 of 2 questions
Barium is used in X-ray imaging because it effectively absorbs X-rays, which makes it show up clearly on X-ray images. This property helps in creating a clear contrast between the stomach and surrounding tissues, allowing doctors to examine the stomach’s structure more easily.
Cobalt-60 is a radioactive isotope that emits gamma rays. These high-energy rays are used in radiation therapy for cancer treatment because they can penetrate deep into tissues and target cancer cells effectively while minimizing damage to surrounding healthy tissues. Related terms:
Proton therapy is a type of cancer treatment that uses protons to precisely target and destroy tumor cells, minimizing damage to surrounding healthy tissues. It is particularly effective for tumors near sensitive areas, offering fewer side effects compared to conventional radiation therapy.
| Q | UPSC year | Correct answer |
|---|---|---|
| 1 | 1999 | (c) barium is a good absorber of X-rays and this helps the stomach to appear clearly in contrast with the other regions in the picture. |
| 2 | 1999 | (c) Gamma rays |
This page covers 2 previous year UPSC Prelims GS Paper-I questions on Chemistry: Physical Chemistry (Science and Technology), asked from 1996 to 2009. Each has the correct answer and an explanation.
Attempt each question first, then open the answer and read the explanation for every option. Repeat by chapter, and track which statements UPSC reuses across years. Previous year questions show the exam pattern and difficulty level.
Questions on Chemistry: Physical Chemistry (Science and Technology) are available for 8 years, from 1996 to 2009. Use the Year filter to practise a single paper.
