C Programming Test (Random Questions)

C Programming Test (Random Questions) - Computer Science & Engineering

Instruction:

This is a FREE online test. DO NOT pay money to anyone to attend this test.
Total number of questions : 20.
Time alloted : 30 minutes.
Each question carry 1 mark, no negative marks.
DO NOT refresh the page.
All the best :-).

class HappyGarbage01
{
public static void main(String args[])
{
HappyGarbage01 h = new HappyGarbage01();
h.methodA(); /* Line 6 */
}
Object methodA()
{
Object obj1 = new Object();
Object [] obj2 = new Object[1];
obj2[0] = obj1;
obj1 = null;
return obj2[0];
}
}

Where will be the most chance of the garbage collector being invoked?

	A.	After line 9
	B.	After line 10
	C.	After line 11
	D.	Garbage collector never invoked in methodA()

Your Answer: Option

Correct Answer: Option D

Explanation:

Option D is correct. Garbage collection takes place after the method has returned its reference to the object. The method returns to line 6, there is no reference to store the return value. so garbage collection takes place after line 6.

Option A is wrong. Because the reference to obj1 is stored in obj2[0]. The Object obj1 still exists on the heap and can be accessed by an active thread through the reference stored in obj2[0].

Option B is wrong. Because it is only one of the references to the object obj1, the other reference is maintained in obj2[0].

Option C is wrong. The garbage collector will not be called here because a reference to the object is being maintained and returned in obj2[0].

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When using SQL*Plus, Oracle commands, column names, table names and all other database elements:

	A.	are case insensitive.
	B.	are case sensitive.
	C.	must always be in lower case.
	D.	must always be in upper case.

Your Answer: Option

Correct Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

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What is not true of a Java bean?

	A.	There are no public instance variables.
	B.	All persistent values are accessed using getxxx and setxxx methods.
	C.	It may have many constructors as necessary.
	D.	All of the above are true of a Java bean.

Your Answer: Option

Correct Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

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What is not an advantage of stored procedures?

	A.	Greater security
	B.	SQL can be optimized
	C.	Code sharing
	D.	Increased network traffic

Your Answer: Option

Correct Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

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Which of the following statements about a String is correct?

	A.	A String is created on the stack.
	B.	Whether a String is created on the stack or the heap depends on the length of the String.
	C.	A String is a primitive.
	D.	A String can be created by using the statement String s1 = new String;
	E.	A String is created on the heap.

Your Answer: Option

Correct Answer: Option E

Explanation:

No answer description available for this question. Let us discuss.

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class A
{
protected int method1(int a, int b)
{
return 0;
}
}

Which is valid in a class that extends class A?

	A.	public int method1(int a, int b) {return 0; }
	B.	private int method1(int a, int b) { return 0; }
	C.	public short method1(int a, int b) { return 0; }
	D.	static protected int method1(int a, int b) { return 0; }

Your Answer: Option

Correct Answer: Option A

Explanation:

Option A is correct - because the class that extends A is just simply overriding method1.

Option B is wrong - because it can't override as there are less access privileges in the subclass method1.

Option C is wrong - because to override it, the return type needs to be an integer. The different return type means that the method is not overriding but the same argument list means that the method is not overloading. Conflict - compile time error.

Option D is wrong - because you can't override a method and make it a class method i.e. using static.

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A datum that indicates some important state in the content of input or output is

Your Answer: Option

Correct Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

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An attribute that names or identifies entity instances is a(n):

	A.	entity.
	B.	attribute.
	C.	identifier.
	D.	relationship.

Your Answer: Option

Correct Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

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Which command is used to remove an index from the database in SQL?

Your Answer: Option

Correct Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

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10.

Which of the following function prototype is perfectly acceptable?

	A.	int Function(int Tmp = Show());
	B.	float Function(int Tmp = Show(int, float));
	C.	Both A and B.
	D.	float = Show(int, float) Function(Tmp);

Your Answer: Option

Correct Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

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11.

A rectangle represents which of the following in an ERD?

	A.	Attribute
	B.	Entity
	C.	Optional One
	D.	Relationship

Your Answer: Option

Correct Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

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12.

Which of the following statements are correct about enum used in C#.NET?

1 Every enum is derived from an Object class.

2 Every enum is a value type.

3 There does not exist a way to print an element of an enum as a string.

4 Every enum is a reference type.

5 The default underlying datatype of an enum is int.

	A.	1, 2, 5
	B.	1, 4
	C.	3, 5
	D.	2, 3, 4

Your Answer: Option

Correct Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

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13.

The command to remove rows from a table 'CUSTOMER' is:

	A.	REMOVE FROM CUSTOMER ...
	B.	DROP FROM CUSTOMER ...
	C.	DELETE FROM CUSTOMER WHERE ...
	D.	UPDATE FROM CUSTOMER ...

Your Answer: Option

Correct Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

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14.

Which option will be used with touch command to change the access time?

Your Answer: Option

Correct Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

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15.

With which type of SQL Server recovery model, is no logging done?

	A.	Differential recovery
	B.	Full recovery
	C.	Bulk-logged recovery
	D.	Simple recovery

Your Answer: Option

Correct Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

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16.

Normalization ________ data duplication.

	A.	eliminates
	B.	reduces
	C.	increases
	D.	maximizes

Your Answer: Option

Correct Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

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17.

What is the frequency range of the IEEE 802.11g standard?

	A.	2.4Gbps
	B.	5Gbps
	C.	2.4GHz
	D.	5GHz

Your Answer: Option

Correct Answer: Option C

Explanation:

The IEEE 802.11b and IEEE 802.11g standards both run in the 2.4GHz RF range.

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18.

Which of the following statement is correct?

	A.	The order of the default argument will be right to left.
	B.	The order of the default argument will be left to right.
	C.	The order of the default argument will be alternate.
	D.	The order of the default argument will be random.

Your Answer: Option

Correct Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

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19.

The ASCII

	A.	is a subset of 8-bit EBCDIC
	B.	is used only in Western Countries
	C.	is version II of the ASC Standard
	D.	has 128 characters, including 32 control characters
	E.	None of the above

Your Answer: Option

Correct Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

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20.

Some Streams work with input, and some with output

	A.	True
	B.	False

Your Answer: Option

Correct Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

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