Computer Science Previous Year Questions (page 8)

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Aggression relates to emotions, attitudes and behaviour, which belong to the affective domain of learning.

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The psychomotor domain (doing, action) is also called the conative domain. Cognitive is knowing and affective is feeling.

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In Piaget's sensorimotor stage (birth to 2 years), infants learn about the world through their senses and motor actions.

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Sigmund Freud described the latency period (about 6 years to puberty) as one of the stages of psychosexual development.

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Vygotsky said that private speech (talking to oneself) helps children guide and regulate their own thinking and behaviour.

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In the 2001 revision by Anderson and Krathwohl, the nouns were changed to verbs, and synthesis became "creating", placed at the top level.

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Private-school students could continue studying because they had better access to digital devices and the internet. The gap is a technological (digital divide) factor.

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Adolescents feel that everyone is watching them (Elkind's "imaginary audience"), so they become very self-conscious.

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In childhood (early childhood), imagination is strong, so children enjoy fictional stories such as fairy tales the most.

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Java is strongly (and statically) typed: every variable must be declared with a type, and the compiler does not allow values of incompatible types to be mixed without an explicit cast.

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Options (b) and (c) are printed identically in the source book.

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Morphing smoothly transforms one image or shape into another through intermediate frames. Tweening only generates in-between frames of position or motion, and inverse kinematics deals with jointed movement.

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In immediate addressing the operand value itself is part of the instruction; in ADD R4, #3 the constant 3 (marked by #) is used directly, with no memory lookup.

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A CD-ROM stores data as pits along one continuous spiral track running from the centre outward, while hard disks and floppy disks use concentric circular tracks.

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The OS stores each process's state, program counter, registers, scheduling and memory information in its Process Control Block (PCB), which it uses to save and restore the process during context switches.

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RISC (Reduced Instruction Set Computer) keeps only a small set of simple, essential instructions that run in about one clock cycle each, which increases speed. CISC uses many complex instructions.

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Total bandwidth = 10 channels × 3000 Hz + 9 guard bands × 300 Hz = 30,000 + 2,700 = 32,700 Hz. Ten channels need only nine guard bands between them.

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The IT Act, 2000 was amended by the Information Technology (Amendment) Act, 2008, which added offences such as cyber terrorism and identity theft. This amended version is called the IT Act, 2008.

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random.randrange(100) returns an integer from 0 to 99 (the stop value is excluded). Adding 1 gives a range of 1 to 100.

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The data list has 2 values but the index has 3 labels. pandas cannot match the lengths, so it raises a ValueError ("Length of values does not match length of index").

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LS[::2] takes indexes 0, 2, 4, 6, giving [1, 2, 3, 5]. LS[::-2] starts from the last element and goes backwards in steps of 2, giving [4, 7, 8, 9]. Joined, they give [1, 2, 3, 5, 4, 7, 8, 9].

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NumPy subtracts arrays element by element: [12−10, 23−20] = [2 3]. It does not stack or combine the arrays.

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A variable assigned at the top level of a module is already global, so no global keyword is needed for that first assignment. The keyword is needed only when a function wants to rebind a global name.

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A modem (modulator-demodulator) converts digital data into analog signals for transmission over telephone lines and converts them back at the receiver. Switches, hubs and repeaters handle signals that stay digital.

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GPRS adds packet-switched data to 2G GSM networks. It sits between 2G and 3G, so it is called 2.5G technology.

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CELLPADDING sets the space between a cell's border and its content. CELLSPACING sets the space between neighbouring cells.

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FRAMEBORDER takes 1 or 0 (yes or no) and controls whether a border is shown around the frame. It does not set the border colour or the scrollbars.

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Answer as per the book's key (b). Note that S→next == NULL would normally mean the stack is empty, so this question is doubtful.

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Corrected: the book's key says (c), but (b) is the true statement. Binary search needs random access, so a linked list is unsuitable for it.

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a'b + ab' is 1 only when a and b differ, which is exactly the definition of XOR (a ⊕ b).

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The 1s fill the rows cd = 01 and cd = 11 for every value of ab. In both rows d = 1, while c and a, b change, so the expression is F = d.

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Opacity measures how solid a layer is. Lowering it to 0% makes the layer fully transparent, and raising it makes the layer more solid.

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Stealing a computer speaker is ordinary physical theft. No computer, network or data is used to commit the offence, so it is not a cyber crime.

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In Flash, Break Apart (Ctrl+B) splits a text block into separate letters, so each letter can be placed on its own layer and animated separately.

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The Library panel of a Flash file stores all its symbols, plus any imported bitmaps, sounds and videos, so they can be reused across the document.

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Video editing works on audio and video media streams and is not organised around stored records. Profile, result and inventory systems are classic database applications.

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The crow's foot (many) is on the E1 side and the plain (one) end is on the E2 side. Many E1 entities relate to one E2 entity, so the relationship is many-to-one.

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The loop body does constant work and runs N times, so the running time is linear, O(N). O(2N) also simplifies to O(N).

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Customer calls in a call centre are served in arrival order (first in, first out), so they form a queue, not a hierarchy. Directories, a table of contents and arithmetic expressions are naturally hierarchical trees.

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Multiplication and division are done before addition and subtraction: 2*5 = 10 and 32/8 = 4, so 3 + 10 − 4 = 9.

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Brackets are evaluated first. Among the logical operators, NOT has the highest precedence, then AND, then OR.

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In transactional memory, a memory transaction is a sequence of memory read-write operations that is atomic: either all of them take effect (commit) or none do.

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Minterms 0, 4, 8 and 12 are exactly the cells where Y = 0 and Z = 0, whatever W and X are. These four cells form one group, so F = Y'Z'.

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Perspective makes objects that are farther away appear proportionally smaller, which gives a sense of depth in a two-dimensional image.

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A computer game responds to the player's input, so it is interactive. Radio, TV talk shows and newspapers are one-way media for the audience.

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In the buddy system, when a block is freed, it can be quickly merged with its free buddy to form a larger segment. This merging is called coalescing.

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Positioning time is seek time plus rotational latency. Seek time is the time to move the disk arm to the desired cylinder, and rotational latency is the wait for the sector to rotate under the head.

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Sorting is defined as re-arranging a given set of objects in a specific order (Wirth's definition). The other options describe why sorting is useful, not what sorting is.

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The figure compares pairs, moves the smaller key up each level and puts the minimum (06) at the root. This tournament-style structure is tree (tournament) sort.

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Student S1; creates an object with no arguments, so the default constructor is called. Student S2 = S1; initialises a new object from an existing one, so the copy constructor is called.