The SI unit of frequency is the hertz (Hz), named after the German physicist Heinrich Hertz; one hertz means that an event repeats once per second. An older name for this unit was cycles per second (cps).
Q2. Which among the following is a ‘Modifier key’?
निम्नलिखित में से कौन सा एक ‘संशोधक बटन (मोडिफायर की)’ है?
An inert gas is a gas that has extremely low reactivity with other substances. The noble gases—helium, argon, neon, xenon, krypton, radon, and element 118 (Uuo)—exist in their elemental form and are found in Group 18 of the periodic table.
Q4. Optical fibre works on which of the following principle of light?
प्रकाशीय तंतु निम्नलिखित में से प्रकाश के किस सिद्धांत पर कार्य करता है?
(a) Reflection/ परावर्तन
(b) Refraction/ अपवर्तन
(c) Diffraction/ विवर्तन
(d) Total internal reflection/ पूर्ण आंतरिक परावर्तन
An optical fiber or optical fibre is a flexible, transparent fiber made by drawing glass or plastic to a diameter slightly thicker than that of a human hair. Optical fibers are used most often as a means to transmit light between the two ends of the fiber and find wide usage in fiber-optic communications, where they permit transmission over longer distances and at higher bandwidths (data rates) than wire cables. Optical fibre uses the principle of total internal reflection to the propagation of the light or data.
Q5. Which key is used to move to next line in a Ms-Word document?
एम एस वर्ड डाकुमेंट में दूसरे लाइन में जाने के लिए किस की का प्रयोग होता है?
A pyrometer is a type of remote-sensing thermometer used to measure the temperature of a surface. it is a device that from a distance determines the temperature of a surface from the spectrum of the thermal radiation it emits, a process known as pyrometry and sometimes radiometry.
A local-area network (LAN) is a computer network that spans a relatively small area. Most often, a LAN is confined to a single room, building or group of buildings, however, one LAN can be connected to other LANs over any distance via telephone lines and radio waves.
Q9. Which acid is released when an Ant bites?
जब एक चींटी काटती है, तो किस अम्ल का रिसाव होता है?
A bitmap is a type of memory organization or image file format used to store digital images. The term bitmap comes from the computer programming terminology, meaning just a map of bits, a spatially mapped array of bits.
Q12. Process of gaining electrons is known as ________.
इलेक्ट्रान को प्राप्त करने की प्रक्रिया को _______कहते हैं?
(a) Oxidation/ ऑक्सीकरण
(b) Reduction/ अपचयन
(c) Radiation/ विकिरण
(d) Both oxidation and reduction/ ऑक्सीकरण तथा अपचयन दोनों
The process of gaining electrons is known as reduction. Reduction is a chemical reaction that involves the gaining of electrons by one of the atoms involved in the reaction. The term refers to the element that accepts electrons, as the oxidation state of the element that gains electrons is lowered.