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21

Convert: 6 TB = ______ GB.

SHORT Medium
Information Technology (802) · Class 11 · Sep 26, 2026
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Explanation: 6 TB = 6 x 1024 GB = 6144 GB.
22

A query that joins two tables WITHOUT any join condition in the WHERE clause, producing a Cartesian product of all rows, is called a:

MCQ Medium
a. Inner Join
b. Cross Join
c. Outer Join
d. Self Join
Information Technology (802) · Class 12 · Sep 26, 2026
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Cross Join
Explanation: Without a WHERE clause joining the tables, the result is the Cartesian product of both tables' rows — this is called a Cross Join.
23

Evaluate the Java logical expression: (7 > 3) && (2 < 5)

MCQ Medium
a. TRUE
b. FALSE
Information Technology (802) · Class 12 · Sep 26, 2026
Show answer
TRUE
Explanation: Using && (both true), || (either true), and ! (negation) rules, (7 > 3) && (2 < 5) evaluates to true.
24

The binary language, also called machine language, uses only two digits 0 and 1.

TRUE FALSE Easy
a. TRUE
b. FALSE
Information Technology (802) · Class 11 · Sep 26, 2026
Show answer
TRUE
Explanation: Binary language works on two digits, 0 and 1, denoting off and on electronic signals.
25

Convert: 7 TB = ______ GB.

SHORT Medium
Information Technology (802) · Class 11 · Sep 26, 2026
Show answer
Explanation: 7 TB = 7 x 1024 GB = 7168 GB.
26

If Teacher has 14 rows and Department has 9 rows, how many rows result from a Cross Join (SELECT ... FROM Teacher, Department with no WHERE clause)?

MCQ Medium
a. 14
b. 9
c. 23
d. 126
Information Technology (802) · Class 12 · Sep 26, 2026
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126
Explanation: A Cross Join produces the Cartesian product: 14 x 9 = 126 rows.
27

Evaluate the Java logical expression: (7 > 3) && (2 > 5)

MCQ Medium
a. TRUE
b. FALSE
Information Technology (802) · Class 12 · Sep 26, 2026
Show answer
FALSE
Explanation: Using && (both true), || (either true), and ! (negation) rules, (7 > 3) && (2 > 5) evaluates to false.
28

Hardware refers to intangible components of a computer such as operating systems.

TRUE FALSE Easy
a. TRUE
b. FALSE
Information Technology (802) · Class 11 · Sep 26, 2026
Show answer
FALSE
Explanation: Hardware refers to tangible components (keyboard, mouse, monitor); software is intangible.
29

Convert: 2 PB = ______ TB.

SHORT Easy
Information Technology (802) · Class 11 · Sep 26, 2026
Show answer
Explanation: 2 PB = 2 x 1024 TB = 2048 TB.
30

When the same attribute name (e.g., Dept_ID) exists in both joined tables, ambiguity is resolved by:

MCQ Medium
a. Renaming one of the tables permanently
b. Prefixing the attribute name with the relation name (e.g., Teacher.Dept_ID)
c. Deleting the duplicate column
d. It is not possible to join such tables
Information Technology (802) · Class 12 · Sep 26, 2026
Show answer
Prefixing the attribute name with the relation name (e.g., Teacher.Dept_ID)
Explanation: Ambiguity between same-named attributes across joined tables is resolved by prefixing the attribute with its relation name, e.g., Department.Dept_ID.
31

Evaluate the Java logical expression: (1 > 2) || (3 < 4)

MCQ Medium
a. TRUE
b. FALSE
Information Technology (802) · Class 12 · Sep 26, 2026
Show answer
TRUE
Explanation: Using && (both true), || (either true), and ! (negation) rules, (1 > 2) || (3 < 4) evaluates to true.
32

A computer's main (primary) memory is volatile, meaning data is lost when power is switched off.

TRUE FALSE Easy
a. TRUE
b. FALSE
Information Technology (802) · Class 11 · Sep 26, 2026
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TRUE
Explanation: Primary/main memory (RAM) is volatile; secondary memory retains data without power.
33

Convert: 3 PB = ______ TB.

SHORT Easy
Information Technology (802) · Class 11 · Sep 26, 2026
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Explanation: 3 PB = 3 x 1024 TB = 3072 TB.
34

Aliases for table names in SQL are created using which keyword?

MCQ Easy
a. ALIAS
b. AS
c. RENAME
d. RESOLVE
Information Technology (802) · Class 12 · Sep 26, 2026
Show answer
AS
Explanation: Aliases are created using the keyword AS, e.g., FROM Teacher AS T, Department AS D.
35

Evaluate the Java logical expression: (1 > 2) || (3 > 4)

MCQ Medium
a. TRUE
b. FALSE
Information Technology (802) · Class 12 · Sep 26, 2026
Show answer
FALSE
Explanation: Using && (both true), || (either true), and ! (negation) rules, (1 > 2) || (3 > 4) evaluates to false.
36

Define GIGO with respect to computers.

SHORT Medium
Information Technology (802) · Class 11 · Sep 26, 2026
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Explanation: GIGO stands for Garbage In Garbage Out. It means that errors seen in computer output are usually due to wrong data entry or wrong instructions given by the user, not due to the machine itself.
37

Convert: 4 PB = ______ TB.

SHORT Easy
Information Technology (802) · Class 11 · Sep 26, 2026
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Explanation: 4 PB = 4 x 1024 TB = 4096 TB.
38

Which keyword eliminates duplicate values from a query's result set?

MCQ Easy
a. UNIQUE
b. DISTINCT
c. ONLY
d. SINGLE
Information Technology (802) · Class 12 · Sep 26, 2026
Show answer
DISTINCT
Explanation: The DISTINCT keyword in the SELECT clause removes duplicate values from the result.
39

Evaluate the Java logical expression: !(6 > 2)

MCQ Medium
a. TRUE
b. FALSE
Information Technology (802) · Class 12 · Sep 26, 2026
Show answer
FALSE
Explanation: Using && (both true), || (either true), and ! (negation) rules, !(6 > 2) evaluates to false.
40

What is a program?

SHORT Easy
Information Technology (802) · Class 11 · Sep 26, 2026
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Explanation: A program is a set of instructions provided to the computer for doing a specific task.