Study
and learn Java MCQ questions and answers on Primitive data types like byte,
short, char, int, long, float, double and boolean. Attend job interviews easily
with these MCQs.
Go
through Java Basic Theory Notes on Data Types before studying
these questions.
1) What does a Data Type in Java refers to?
A) The place
where data is stored
B) The
technique how data is retreived
C) The type
or variety of data being handled for reading and writing
D) None of
the above
Answer [=]
C
Explanation:
Integers, Real numbers, Boolean,
Characters etc
2) Choose the wrong statement about Java programming?
A) Java
supports unsigned integers
B) Java
supports signed integers
C) Java
supports signed char
D) None of
the above
Answer [=]
A
Explanation:
Only C language supports unsigned
integers. Java does not support.
3) Which data type among the following is an
implementation of Objects or OOPs?
A) byte
B) int
C) char
D) None of
the above
Answer [=]
D
Explanation:
All primitive data types are
implemented in a Non-Object Oriented way.
4) What is a Primitive Data Type in Java?
A) Data
type, which is implemented in an Object-oriented way.
B) Data Type
which is implemented in a machine-dependent way
C) Data Type
which is implemented in a non-object oriented way.
D) None of
the above
Answer [=]
C
5) which among the following is not a Data Type in
Java?
A) short
B) int
C) long
double
D) double
Answer [=]
C
Explanation:
"long double" is present
only in C language.
6) Which among the following is not a valid Data Type
in Java?
A) long
B) bool
C) double
D) float
Answer [=]
B
Explanation:
It is "boolean" not "bool".
7) Which is the data type used mostly to handle
streams and buffers in Java language?
A) short
B) int
C) byte
D) float
Answer [=]
C
8) Which is the data type that is not recommended for
numeric applications in Java?
A) byte
B) float
C) int
D) long
Answer [=]
A
Explanation:
Size of a byte is only 8 bits. Also,
any arithmetic operation produces output in int, float or double. It cannot
handle more data.
9) Choose the number range for byte data type in Java?
A) -127 to
+128
B) -128 to
+127
C) 0 to 256
D) 0 to 255
Answer [=]
B
10) What is the size of a SHORT integer in Java?
A) 1 byte
B) 2 bytes
C) 4 bytes
D) 8 bytes
Answer [=]
B
Explanation:
Number range is -32768 and +32767.
11) What is the size of an INT integer in Java?
A) 2 bytes
B) 4 bytes
C) 6 bytes
D) 8 bytes
Answer [=]
B
Explanation:
Number range is -2147483648 and
2147483647.
12) What is the size of a LONG integer in Java?
A) 2 bytes
B) 4 bytes
C) 8 bytes
D) 16 bytes
Answer [=]
C
Explanation:
Range: -9223372036854775808 and
9223372036854775807.
13) What is the size of a FLOAT floating point number
in Java?
A) 2 bytes
B) 4 bytes
C) 6 bytes
D) 8 bytes
Answer [=]
B
Explanation:
Number range
is ±3.40282347E+38F
14) What is the size of a DOUBLE floating point number
in Java?
A) 4 bytes
B) 6 bytes
C) 8 bytes
D) 16 bytes
Answer [=]
C
Explanation:
Number range
is ±1.79769313486231570E+308.
15) What is the size of a CHAR data type constant in
Java?
A) 1 byte
B) 2 bytes
C) 4 bytes
D) 6 bytes
Answer [=]
B
16) What is the size of a boolean data type constant
in Java?
A) 1 bit
B) 4 bits
C) 8 bits
D) Not
documented well
Answer [=]
D
Explanation:
A boolean value can hold only one
bit of information. But the size of a boolean constant in memory is not defined
clearly anywhere. It is machine dependent. It may be 4 bytes or so.
17) What is the IEEE standard adopted to represent
Floating point numbers in Java?
A) IEEE 9000
B) IEEE 800
C) IEEE 754
D) IEEE 512
Answer [=]
C
Explanation:
IEEE stands for Institute of
Electrical and Electronics Engineers. Original specifications were defined in
the year 1985. The current version includes improvements or corrections done in
the year 2008.
18) What is the character encoding standard used in Java
language?
A) ASCII
B) Unicode
C) Hexacode
D) Bytecode
Answer [=]
C
Explanation:
Unicode takes 2 Bytes of memory to
represent all characters of all languages.
19) What is the abbreviation of ASCII?
A) American
Standard Characters for Information Interchange
B)
Australian Standard Code for Information Interchange
C)
American Standard Code for Information Interchange
D) None of
the above
Answer [=]
C
Explanation:
ASCII can represent only the English
Alphabets and a few special symbols.
20) Choose the right statement about Java Data types.
A) Integer
data types are short, int and long
B) Real
number data types are float and double
C) The
character data type is char.
D) All the
above
Answer [=]
D
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