TCS ILP PAT TEST on Java

1.Which of the following statements is false about objects?

a.An instance of a class is an object
b.Objects can access both static and instance data
c.Object is the super class of all other classes
d.Objects do not permit encapsulation

2.Which methods can access to private attributes of a class?

a.Only Static methods of the same class
b.Only instances of the same class
c.Only methods those defined in the same class
d.Only classes available in the same package.

3.What is an aggregate object?

a.An object with only primitive attributes
b.An instance of a class which has only static methods
c.An instance which has other objects
d.None of the above

4.Assume that File is an abstract class and has toFile() method. ImageFile and BinaryFile are concrete classes of the abstract class File. Also, assume that the method toFile() is implemented in both Binary File and Image File. A File references an ImageFile object in memory and the toFile method is called, which implementation method will be called?

a.Binary File
b.Image File
c.Both File and Binary Files
d.None of the above

5.A class can have many methods with the same name as long as the number of parameters or type of parameters is different. This OOP concept is known as

a.Method
b.Invocating
c.Method
d.Overriding
e.Method Labeling
f.Method
g.Overloading

6.Which of the following is considered as a blue print that defines the variables and methods common to all of its objects of a specific kind?

a.Object
b.Class
c.Method
d.Real data
e.types

7.What are the two parts of a value of type double?

a.Significant Digits,
b.Exponent
c.Length, Denominator
d.Mode, Numerator

8.After the following code fragment, what is the value in fname?

Code:

String str;
int fname;
str = "Foolish boy.";
fname = str.indexOf("fool");

a.2
b.-1
c.4

9.What is the value of ‘number’ after the following code fragment execution?

Code:

int number = 0;
int number2 = 12
while (number < number2)
{number = number + 1;
}

a.5
b.12
c.21
d.13

10.Given the following code snippet;

Code:

int salaries[];
int index = 0;
salaries = new int salaries[4];
while (index < 4)
{
salaries[index] = 10000;
index++;
}

What is the value of salaries [3]?

a.4000

b.5000

c.1500

d.1000

12.Which of the following is not a return type?

a.boolean
b.void
c.public
d.Button

13.If result = 2 + 3 * 5, what is the value and type of ‘result’ variable?

a.17,byte
b.25, byte
c.17, int
d.25, int

14.What is the data type for the number 9.6352?

a.float
b.double
c.Float
d.Double

15.Assume that the value 3929.92 is of type ‘float’. How to assign this value after declaring the variable ‘interest’ of type float?

a.interest = 3929.92
b.interest = (Float)3929.92
c.interest = 3929.92(float)
d.interest = 3929.92f