Higher Study | Java Program

Which is true?

ক

∑F = ∑Fx + ∑Fy + ∑Fz

খ

∑F = -(∑Fx + ∑Fy + ∑Fz)

গ

∑F = ∑Fxi + ∑Fyj + ∑Fzk

ঘ

∑F = -(∑Fxi+ ∑Fyj + ∑Fzk)

How many Primitive data types are there in Java?

ক

4

খ

2

গ

8

ঘ

7

Java is a ........... language.

ক

weakly typed

খ

strongly typed

গ

moderate typed

ঘ

None of these

In Java byte, short, int and long all of these are

ক

signed

খ

unsigned

গ

Both of the above

ঘ

None of these

Size of int in Java is

ক

16 bit

খ

32 bit

গ

64 bit

ঘ

Depends on execution environment

The smallest integer type is ......... and its size is ......... bits.

ক

short, 8

খ

byte, 8

গ

short, 16

ঘ

short, 16

Size of float and double in Java is

ক

32 and 64

খ

64 and 64

গ

32 and 32

ঘ

64 and 32

Automatic type conversion in Java takes place when

ক

Two type are compatible and size of destination type is shorter than source type.

খ

Two type are compatible and size of destination type is equal of source type.

গ

Two type are compatible and size of destination type is larger than source type.

ঘ

All of the above

Which of the following automatic type conversion will be possible?

ক

short to int

খ

byte to int

গ

int to long

ঘ

All of these

In Java, the word true is ................

ক

A Java keyword

খ

A Boolean literal

গ

Same as value 1

ঘ

Same as value 0

Suppose a class has public visibility. In this class we define a protected method. Which of the following statements is correct?

ক

This method is only accessible from inside the class itself and from inside all subclasses.

খ

In a class, you cannot declare methods with a lower visibility than the visibility of the class in which it is defined.

গ

From within protected methods you do not have access to public methods.

ঘ

This method is accessible from within the class itself and from within all classes defined in the same package as the class itself.

A package is a collection of

ক

Classes

খ

Interfaces

গ

Editing tools

ঘ

Classes and Interfaces

ঙ

Editing tools and Interfaces

A method within a class is only accessible by classes that are defined within the same package as the class of the method. Which one of the following is used to enforce such restriction?

ক

Declare the method with the keyword public.

খ

Declare the method with the keyword private.

গ

Declare the method with the keyword protected.

ঘ

Do not declare the method with any accessibility modifiers.

ঙ

Declare the method with the keyword public and private.

Name the keyword that makes a variable belong to a class, rather than being defined for each instance of the class.

ক

static

খ

final

গ

abstract

ঘ

native

ঙ

volatile

In Java arrays are

ক

objects

খ

object references

গ

primitive data type

ঘ

None of the above