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

Stationary electric charges are called Static charges.

• Static Charges: These are electric charges that are not in motion. They can accumulate on the surface of objects and are typically generated through processes such as friction, where electrons are transferred from one material to another.

The name of the motion of charged particles in any medium is Current.

• Current refers to the flow of electric charge, which is typically carried by electrons in a conductor. When charged particles move through a medium, they create an electric current.

The rated output voltage of a silver oxide cell is 1.5 VDC.

• Silver oxide batteries typically have a nominal voltage of approximately 1.5 volts, which remains stable during discharge, making them suitable for various applications, including watches and medical devices.

The materials commonly used for semiconductors are Silicon and germanium.

• Silicon (Si): This is the most widely used semiconductor material due to its abundant availability, stable properties, and suitability for various electronic applications.
• Germanium (Ge): Although less common than silicon, germanium is also an important semiconductor material, particularly in high-speed electronics and certain types of transistors.

For measuring electrical quantities, the terminal of the meter that is connected is the Input terminal.

• The input terminal is where the electrical quantity (such as voltage or current) enters the meter for measurement. In various types of meters, including energy meters and multimeters, the input terminal is crucial for obtaining accurate readings of the electrical parameters being measured.
• The output terminal, on the other hand, is typically used to send the measured data to a display or another device, while the pointer mechanism refers to the part of an analog meter that indicates the measurement but does not directly relate to where connections are made for measurement.

The name of the pair of metal strips used in a battery cell is Electrodes.

• Electrodes are the conductive materials through which electric current enters or leaves the battery.
• In a typical battery cell, there are two electrodes: the anode (negative electrode) and the cathode (positive electrode).
• These electrodes are crucial for the electrochemical reactions that occur within the battery, enabling it to store and release energy.

Mechanical zero error in panel meters occurs at normal condition.

• Mechanical zero error is a common issue that arises due to the mechanical components of the meter not returning to the true zero position when no input is applied.

• The material used for the negative terminal of alkaline manganese dioxide batteries is Zinc.
• This is because, during the battery’s electrochemical reaction, zinc serves as the anode where oxidation occurs, while manganese dioxide acts as the cathode

• An ammeter is connected in a circuit in series.
• This configuration allows the ammeter to measure the total current flowing through the circuit, as all the current must pass through it.
• If an ammeter is connected in parallel, it can cause a short circuit due to its low resistance, potentially damaging the meter and affecting the circuit’s operation

• The Ammeter resistance value should be very low.
• Ideally, an ammeter should have zero internal resistance to ensure that it does not affect the current flowing through the circuit it measures.
• In practice, while it may have a very small resistance (often in the range of milliohms), it is designed to be as low as possible to avoid influencing the circuit’s operation