Q79.
Due to improper/indiscriminate disposal of old and used computers or their parts, which of the following are released into the environment as e-waste? 1. Beryllium 2. Cadmium 3. Chromium 4. Heptachlor 5. Mercury 6. Lead 7. Plutonium Select the correct answer using the codes given below:
Answer
B
Explanation
Beryllium is used in circuit boards. Cadmium is in wiring boards and connectors. Chromium in hard disk drives. Mercury in LCD screens and laptops. Lead in motherboards. Heptachlor is an organochlorine insecticide — not a component of computers. Plutonium is a radioactive metal not present in computers.