Tag: general knowledge

Impulse is the product of force and the time interval over which it acts (J = F × Δt). This equals the change in momentum of an object, making it a fundamental concept in analyzing collisions and forces.

In series circuits, resistances add directly (Rtotal = R1 + R2 + R3 + ...). Current must flow through each resistor sequentially, so the total resistance is the sum of all individual resistances.

The Ganga was officially declared India's national river in 2008, recognizing its immense cultural, religious, and economic significance. It is considered sacred in Hinduism and supports millions of people.

The first PLC was developed in 1968 at General Motors' Hydramatic division in the United States, with Dick Morley widely credited as the 'father of the PLC.' This revolutionized industrial automation by replacing hard-wired relay systems.

No industrial network is universally the best - each has strengths suited to different applications. Profibus offers robust communication, DeviceNet provides efficient manufacturing integration, and Fieldbus has specific advantages. The choice depends on speed, noise immunity, cost, and compatibility requirements.

The IEC 61158 Fieldbus standard (IEC 61158) currently includes 8 different communication network types. These include various industrial communication protocols like FOUNDATION Fieldbus, Profibus, and others that were standardized under this international standard. Options A (1), B (3), and D (15) are incorrect as they don't match the actual number of standardized networks.

Koneru Humpy became India's first Woman Grandmaster (WGM) in 2002 when she earned the title at age 15. Aarthie Ramaswamy and S. Vijayalakshmi are also strong chess players but Humpy achieved the WGM title first. S. Meenakshi is another Indian woman chess player but not the first WGM. The WGM title is the highest title for women chess players, below the unrestricted Grandmaster (GM) title.

Temperature is the most commonly measured variable in industrial process control and measurement. This is because temperature affects virtually every chemical reaction, physical process, and material property in industrial settings. Temperature sensors (thermocouples, RTDs, thermistors) are ubiquitous in process industries. While pressure, flow, and level are also critical measurements, temperature is measured more frequently than any other variable.

Infrared waves have longer wavelengths than visible red light. The visible spectrum ranges from approximately 380nm (violet) to 750nm (red). Infrared radiation starts just beyond red light (~700nm-1mm) and has longer wavelengths. Yellow and green have shorter wavelengths than red (~570-590nm for yellow, ~495-570nm for green), while ultraviolet has shorter wavelengths than the entire visible spectrum (~10-400nm).

The law of reflection states that the angle of incidence equals the angle of reflection. Both angles are measured with respect to the normal (a line perpendicular to the surface at the point of incidence). This is a fundamental principle of geometric optics and applies to all types of waves reflecting off surfaces. Options A and B are incorrect because the relationship is equality, not a fractional or multiple relationship.