Q: 74 (CDS-I/2005)

Consider the following statements: Copper rods are generally preferred to iron rods for making lightning conductors because
1. Copper is a better conductor of electricity than iron.
2. Copper is not easily oxidised under atmospheric conditions.
3. Copper is cheaper and easily available as compared to iron.
4. Specific heat of copper is more than that of iron.
Which of the statements given above are correct ?
question_subject: 
Science
question_year: 
2005
question_exam: 
CDS-I
stats: 
0,312,264,312,64,48,152