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CBSE Class 11 Pre Board 2021 : Computer Science - Prelim (CBSE Gulf Sahodaya Qatar Chapter, Doha)

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PREBOARD EXAMINATION 2020-21 Class: XI (CBSE) Date . SUBJECT - COMPUTER SCIENCE Total Marks: 80 Time: 3 hrs. General Instructions: All questions are compulsory. Question paper is divided in 3 sections, A, B and C Section - A : Unit-1 Section - B : Unit-2 Section - C : Unit-3 SECTION - A Q1 Arrange the following in ascending order: Byte, TB, Bit, MB, KB, GB, Nibble 1 Q2 What is Unicode? 1 Q3 What is the difference between compiler and interpreter? 1 Q4 Which of the following are not input devices? (i) Keyboard (ii) Microphone (iii) Projector (iv) Headphones 1 Q5 Name any 2 temporary storage devices of the computer. 1 Q6 Prove that X.(X+Y) = X, by truth table method 1 Q7 What is the difference between System software and Application software? 1 Q8 Write the equivalent Boolean expression for the following circuit. 1 Q9 Convert the Following as Directed (i) (534) 10 =(?) 2 (ii) (101011) 2 =(?) 10 2 Page 1 of 5

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