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Q101 (CAPF/2026) Science & Technology › New Materials, Energy & Environment-linked Tech

Which of the following statements about nuclear fuel are correct?
1. Spent fuel is highly radioactive.
2. Fuel has to be enriched.
3. Failure of the control system can lead to a meltdown.
Select the answer using the code given below.

Result
Your answer: —  ·  Correct: B

Explanation

All three statements regarding nuclear fuel are correct:

  • Statement 1: Spent fuel is the fuel removed from a reactor after use. It is highly radioactive because it contains fission products (like Cesium-137 and Strontium-90) and transuranic elements that emit intense radiation and heat for long periods.
  • Statement 2: In the standard nuclear fuel cycle, uranium must be enriched. Natural uranium contains only about 0.7% of the fissile isotope U235. Most commercial Light Water Reactors (LWRs) require enrichment to 3-5% U235 to maintain a sustained chain reaction.
  • Statement 3: Control systems, such as control rods (which absorb neutrons) and coolant systems, regulate the reactor's temperature and fission rate. A failure in these systems can lead to an uncontrolled chain reaction or loss of cooling, causing the fuel to melt (a nuclear meltdown).
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SIMILAR QUESTIONS

CDS-I · 2008 · Q60 Relevance score: 3.92

Consider the following statements 1. India has 10 Pressurized Heavy Water Reactors (PHWRs). 2. The spent fuel from the PHWRs is reprocessed into plutonium. 3. All imported reactors are under the safeguards of the international Atomic Energy Agency (IAEA). Which of the statements given above is/are correct ?

CDS-II · 2007 · Q41 Relevance score: 3.92

Consider the following statements 1. India has 10 Pressurized Heavy Water Reactors (PHWRs). 2. The spent fuel from the PHWRs is reprocessed into plutonium. 3. All imported reactors are under the safeguards of the international Atomic Energy Agency (IAEA). Which of the statements given above is/ are correct ?

CDS-I · 2002 · Q8 Relevance score: 2.05

Consider the following statements: 1. Plutonium-239 can be made artificially 2. Boron is used in a nuclear reactor to absorb unwanted neutrons 3. In nature, the availability of Uranium-238 is much more than that of Uranium-235 Which of these statements is/are correct?

UPPCS · 2021 · Q23 Relevance score: 1.97

With reference to the radioactivity, which of the following statements is/are correct ?
1. Radioactivity is a nuclear property.
2. Hydrogen bomb is prepared on the principle of nuclear fission.
Select the correct answer using the codes given below.
Codes :

IAS · 2023 · Q11 Relevance score: 1.66

Consider the following statements : Statement-I : India, despite having uranium deposits, depends on coal for most of its electricity production. Statement-II : Uranium, enriched to the extent of at least 60%, is required for the production of electricity. Which one of the following is correct in respect of the above statements?