In optometry, the least distance of distinct vision (LDDV) or the reference seeing distance (RSD) is the closest someone with “normal” vision (20/20 vision) can comfortably look at something. In other words, LDDV is the minimum comfortable distance between the naked human eye and a visible object. The Least Distance of Distinct vision (in cm) for a normal human being is 25 cm.
Q2. What is the full form of ISDN?
आईएसडीएन.का असंक्षिप्त रूप क्या है?
(a) International Service Digital network/ इंटरनेशनल सर्विस डिजिटल नेटवर्क
(b) Indian Service Digital Network/ इंडियन सर्विस डिजिटल नेटवर्क
(c) Integrated Service Digital Network/ इंटीग्रेटेड सर्विस डिजिटल नेटवर्क
(d) Internal Service Digital Network/ इंटरनल सर्विस डिजिटल नेटवर्क
Integrated Services Digital Network (ISDN) is a set of communication standards for simultaneous digital transmission of voice, video, data, and other network services over the traditional circuits of the public switched telephone network.
Q3. Which among the following is used to treat Indigestion?
निम्नलिखित में से किसे अजीर्ण के इलाज के लिए उपयोग किया जाता है?
Antacids are medicines that counteract (neutralise) the acid in your stomach to relieve indigestion and heartburn. They come as a liquid or chewable tablets and can be bought from pharmacies and shops without a prescription.
Q4. At what temperature (in degree celsius), the numerical values on Celsius and Fahrenheit scales become equal?
किस तापमान (डिग्री सेल्सियस में) पर सेल्सियस तथा फ़ारेनहाइट स्केल पर अंकीय मान समान हो जाते हैं?
The two scales have different zero points and the Celsius degree is bigger than the Fahrenheit one. There is one point on the Fahrenheit and Celsius scales where the temperatures in degrees are equal. This is -40 °C and -40 °F.
MICR is an acronym for Magnetic Ink Character Recognition
MICR code is a character-recognition technology used mainly by the banking industry to ease the processing and clearance of cheques and other documents. The MICR encoding, called the MICR line, is at the bottom of cheques and other vouchers and typically includes the document-type indicator, bank code, bank account number, cheque number, cheque amount, and a control indicator. The technology allows MICR readers to scan and read the information directly into a data-collection device.
Q6. What is the process of conversion of solid state directly to gaseous state called?
ठोस अवस्था से सीधे गैसीय अवस्था में परिवर्तन की प्रक्रिया को क्या कहते हैं?
Evaporation – Evaporation is when a liquid becomes a gas without forming bubbles inside the liquid volume. If bubbles are formed we are talking instead about “boiling”. For example, water left in a bowl will slowly disappear. The water evaporates into water vapor, the gas phase of water.
Condensation – Condensation is the process by which water vapor in the air is changed into liquid water.
Sublimation – Sublimation is the phase transition of a substance directly from the solid to the gas phase without passing through the intermediate liquid phase.
Distillation – Distillation is a chemical process where a mixture made of two or more liquids (called “components”) with different boiling points can be separated from each other. The mixture is heated until one of the components boils (turns to a vapor). The vapor is then fed into a condenser, which cools the vapor and changes it back into a liquid that is called distillate. What remains in the original container is called the “residue”.
The CDC 6600 was the flagship mainframe supercomputer of the 6000 series of computer systems manufactured by Control Data Corporation. The CDC 6600 anticipated the RISC design philosophy and, unusually, employed a one’s’-complement representation of integers.
An aerosol is a colloid of fine solid particles or liquid droplets, in air or another gas. Aerosols can be natural or anthropogenic. Examples of natural aerosols are fog, forest exudates and geyser steam. Examples of artificial aerosols are haze, dust, particulate air pollutants and smoke.
Q10. When light passes from one medium to another, this phenomenon of change in its direction is called _____.
प्रकाश के एक माध्यम से दूसरे माध्यम में गुजरने पर उसकी दिशा में होने वाले दिशा परिवर्तन की घटना _____ कहलाती है।
Refraction – Refraction is the change in direction of a wave, caused by the change in the wave’s speed. Examples of waves include sound waves and light waves. Refraction is seen most often when a wave passes from one medium to a different medium. Different types of medium include air and water.
Diffraction – Diffraction refers to various phenomena that occur when a wave encounters an obstacle or a slit. It is defined as the bending of light around the corners of an obstacle or aperture into the region of geometrical shadow of the obstacle.
Propagation – It is the action of widely spreading and promoting an idea, theory, etc.
Q11. Which among the following is not an input device?
निम्नलिखित में से कौन एक इनपुट डिवाइस नहीं है?
(a) Plotter/ प्लॉटर
(b) Magnetic Ink Character Recognition (MICR)/ मैग्नेटिक इंक करैक्टर रिकग्निशन (ओएमआर)
(c) Optical Mark Recognition (OMR)/ ऑप्टिकल मार्क रिकग्निशन (ओएमआर)
An input device is any hardware device that sends data to a computer, allowing you to interact with and control the computer. Examples of input devices include keyboards, mouse, scanners, digital cameras and joysticks.
An output device is any device used to send data from a computer to another device or user. Most computer dataoutput that is meant for humans is in the form of audio or video. Thus, most output devices used by humans are in these categories. Examples include monitors, projectors, speakers, headphones and printers.
Q12. Which of the following is also known as Carbolic Acid?
निम्नलिखित में से कौन सा कार्बोलिक अम्ल के नाम से भी जाना जाता है?
Phenol, also known as carbolic acid, is an aromatic organic compound with the molecular formula C6H5OH. It is a white crystalline solid that is volatile. The molecule consists of a phenyl group (−C6H5) bonded to a hydroxyl group (−OH).