IOCL Junior Operator General Science MCQ || IOCL Junior Operator General Science Questions and Answers

The shape of the standard wire gauge is Circular metal disk.

• Standard wire gauges are typically made in a circular shape, allowing for the measurement of various wire diameters through notches or holes that correspond to different gauge sizes. This design facilitates easy and accurate measurement of wire thickness.

The metal that has very good conductivity of electric current is Silver.

• Silver is known to have the highest electrical conductivity of all metals, making it the best conductor for electric current.
• It is followed closely by copper, which also has excellent conductivity but is less effective than silver.
• Gold and aluminum have lower conductivity compared to both silver and copper.

The rated voltage of a single cell in a lead-acid battery is indeed often specified as 2.2 V when fully charged.

The percentage of conductivity of electric current in aluminum is 60%.

• The conductivity of aluminum is typically around 61% to 65% of the International Annealed Copper Standard (IACS).

The effect on the current flow with increased diameter of a conductor is it allows high current flow.

• A larger diameter conductor has a greater cross-sectional area, which provides more pathways for electrons to move through.
• This results in lower resistance, enabling a higher current to flow without overheating the conductor.
• Essentially, thicker wires can carry more current safely compared to thinner ones.

The cores used in intermediate frequency transformers are typically made of Ferrite.

• Ferrite materials are preferred for intermediate frequency transformers due to their high magnetic permeability and low losses at higher frequencies.
• They help in efficiently transferring energy while minimizing heat generation, making them suitable for applications in radio and communications equipment.

In hydropower stations, the energy that is converted into electrical energy is primarily Mechanical energy.

• Hydropower plants utilize the potential energy of water stored at height, which is converted into kinetic energy as the water flows down.
•  This kinetic energy then drives turbines, converting it into mechanical energy, which is subsequently transformed into electrical energy by generators.

Batteries are classified primarily as Primary cells and secondary cells.

• Primary cells are non-rechargeable batteries that can be used once and then discarded.
• Secondary cells are rechargeable batteries that can be used multiple times by recharging them after use.

To correct the mechanical zero error of a panel meter, the appropriate method involves adjusting a screw that is specifically designed for this purpose. This adjustment is referred to as the mechanical zero setting of the meter.

1. Open Circuit: Ensure that the terminals of the meter are open (not connected to any circuit).
2. Locate the Zero-Adjust Screw: Find the screw on the panel meter that is used for zero adjustment.
3. Adjust the Screw: Turn the screw slowly until the pointer aligns exactly with the zero mark on the scale.

The insulation coating on wires remains undamaged even when bent due to its elastic properties. Therefore, the correct answer is due to elastic property of insulation.

• The elastic property of the insulation material allows it to stretch and flex without cracking or breaking when the wire is bent.
• This characteristic is crucial for maintaining the integrity of the insulation, especially in applications where wires are subject to frequent movement or bending.