NDA 2026
- Exam
- NDA
- Year
- 2026
- Subject
- General Ability
- Chapter
- General Studies
NDA 2026 · General Ability · General Studies
Consider the following critical minerals: I. Neodymium II....
Consider the following critical minerals:
I. Neodymium
II. Tellurium
III. Dysprosium
IV. Gallium
Which of the above minerals are not used for the production of photovoltaic cells used in solar panels?
I. Neodymium
II. Tellurium
III. Dysprosium
IV. Gallium
Which of the above minerals are not used for the production of photovoltaic cells used in solar panels?
Options
- AI and IV
- BII and III
- CI and III
- DII and IV
Correct answer
C. I and III
Step-by-step solution
Neodymium (I) and Dysprosium (III) are rare earth elements primarily used in the manufacturing of strong permanent magnets, which are essential for wind turbines and electric vehicle motors. They are not used in the production of photovoltaic cells.
Tellurium (II) is a key component in cadmium telluride (CdTe) thin-film solar cells.
Gallium (IV) is used in the production of copper indium gallium selenide (CIGS) and gallium arsenide (GaAs) solar cells.
Thus, Neodymium and Dysprosium are not used for the production of photovoltaic cells.
Answer: I and III
Tellurium (II) is a key component in cadmium telluride (CdTe) thin-film solar cells.
Gallium (IV) is used in the production of copper indium gallium selenide (CIGS) and gallium arsenide (GaAs) solar cells.
Thus, Neodymium and Dysprosium are not used for the production of photovoltaic cells.
Answer: I and III