Answer: A) Laser Explanation: Compact disc (CD) is a digital optical disc data storage format that was co-developed by Philips and Sony and released in 1982.  These are actually made to replace floppy disks that were used to store files and programs from the computer.   The format was originally developed to store and play only sound recordings but was later adapted for storage of data (CD-ROM).   These CD's uses Laser technology.

Answer: A) असेंबलर स्पष्टीकरण: असेंबलर का उपयोग निम्न-स्तरीय असेंबली भाषा में लिखे गए प्रोग्राम को मशीन कोड (ऑब्जेक्ट कोड) फ़ाइल में अनुवाद करने के लिए किया जाता है ताकि इसे कंप्यूटर द्वारा उपयोग और निष्पादित किया जा सके। इसलिए, असेंबलर असेंबली भाषा में इस्तेमाल किया जाने वाला अनुवादक प्रोग्राम है।

Answer: C) 7 Explanation:

Answer: C) Operating system Explanation: In a brief, the system software is the interface between the hardware and user applications. System software is a type of computer program that is designed to run a computer’s hardware and application programs.   Examples : OS, System utilities, BIOS like mouse, keyboard, hard disc, Device drivers, Assembler,...