Glass is a bad conductor of heat. It doesn’t allow the flow of electrons easily from atom to atom, as seen in substances like copper, and other metals which are excellent conductors of both heat and electricity.
Q2. Which of the following stores data permanently in a computer?
निम्नलिखित में से कौन कंप्यूटर में स्थाई रूप डाटा संधित करता है?
Whole Disk encryption is a technology which protects information by converting it into unreadable code that cannot be deciphered easily by unauthorized people. Disk encryption uses disk encryption software or hardware to encrypt every bit of data that goes on a disk or disk volume.
Q6. Oxide of which of the following will turn red litmus blue?
निम्नलिखित में से किसका ऑक्साइड लाल लिटमस को नीला कर देता है |
A black board has all colours in light or white light . So when light falls on it, board absorbs all colours because all are present so no light is reflected back . That is the case when board has all colours and so it will appear black as it absorbs all colours of light that fall on it.
Q8. Which one among the following is a main system board of a computer?
निम्लिखित में से कौन सा एक संगणक या कंप्यूटर का मुख्य निकाय है |
A ‘motherboard’ is the main the main system board found in general purpose computers. It holds and allows communication between many of the crucial electronic components of a system, such as the central processing unit (CPU) and memory and provides connectors for other peripherals.
Q9. Which among the following metal is used for galvanization?
बिजली से धातु चढाने की क्रिया या गैल्वनीकरण में निम्लिखित में से किस धातु का उपयोग किया जाता है?
Electromagnetic waves do not show interference and diffraction.
General Properties of all electromagnetic radiation:
Electromagnetic radiation can travel through empty space. Most other types of waves must travel through some sort of substance. For example, sound waves need either a gas, solid, or liquid to pass through in order to be heard.
The speed of light is always a constant. (Speed of light : 2.99792458 x 108 m s-1)
Wavelengths are measured between the distances of either crests or troughs. It is usually characterized by the Greek symbol
Q11. What is a bug in computer terminology?
कंप्यूटर शब्दावली में बग से क्या अभिप्राय है?
(a)A virus / एक वायरस
(b)A program / एक प्रोग्राम
(c)An error in program / प्रोग्राम में एक गलती
(d)Magnetic disk storage device / चुम्बकीय डिस्क भण्डारण उपकरण
A bug is an error, flaw, failure or fault in a computer program or system that causes it to produce an incorrect or unexpected result, or to behave in unintended ways. The process of fixing bugs is termed as “debugging”.
Q12. A radio-active substance has a half life of six months. Three-fourth of the substance will decay in ______.
एक रेडियो-थेर्मी वस्तु की अर्ध आयु 6 मास है | वस्तु का तीन-चौथाई हिस्सा_________में क्षय होगा |
Half life of a radioactive substance is the time period in which half of the amount of a radioactive substance decays. If the half life period of a particular radioactive substance is 6 months, then it means that the radioactive substance shall reduce to half of the initial amount in 6 months. It is, then, further decomposed to half (half of the half, i.e., one-fourth) in next 6 months.