Ms. Rani decides to convert her AC generator into a DC generator. Which one of the following she would need to use?

Ramesh cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power

Which of the following statements are correct about the electrical resistance and resistivity of a wire?

1. Both quantities depend on the area of cross-section of the wire

2. Both depend on the temperature

3. Resistance of the wire is directly proportional to the resistivity of the wire

4. Resistivity of the wire is directly proportional to the length of the
wire

Select the correct answer using the code given below:

An iron nail sinks in water whereas an iron ship floats. Which of the following statements is correct in this regard?

1. Average density of ship is greater than that of the water

2. Average density of iron nail is greater than that of the water

3. Average density of the ship is less than that of the water

4. Average density of the ship is equal to that of the water

Select the correct answer using the code given below: