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Indian Institute of Technology Kharagpur

Software Testing
Assignment- 2
TYPE OF QUESTION: MCQ/MSQ
Number of questions: 10 Total mark: 10 X 1 = 10
For each of the following questions one or more of the given options are correct. Choose the
correct option(s).

QUESTION 1:
Which of the following are not black box testing techniques?

a. Boundary value testing

b. Cause-effect graph testing
c. Path testing
d. Combinatorial testing
e. Basic Condition testing

Correct Answer: c. Path testing

e. Basic condition testing
Detailed Solution:
Path testing and Basic condition testing are white-box testing techniques.

QUESTION 2:
Assume you have developed a simple web-based calculator. The user interface has 3 input fields:
Operand1, Operator, and Operand2. The user can give 9 valid inputs: {1, 2, …, 9} for Operand1 and also for
Operand2. The user can enter four valid inputs for Operator: {+, -, *, /}. How many test cases would
exhaustive functional testing require?

a. 3
b. 12
c. 22
d. 256
e. 324

Correct Answer: e. 3 24
Detailed Solution:

9 (Operand1) × 4 (Operator) × 9 (Operand 2) = 324

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QUESTION 3:
Which of the following are false about white-box testing?

a. Test cases are designed using only functional specification of the software:
b. Test cases are designed without any knowledge of the internal structure of the
software.
c. White-box testing is also known as structural testing.
d. Test case design requires a knowledge of the internal structure of the unit under
test
e. White-box tests can detect trojans in the code
f. White-box testing can be used to detect if a software meets all its functional
requirements

Correct Answer: a. Test cases are designed using only functional specification of the software
b. Test cases are designed without any knowledge of the internal structure of
the software
f. White-box testing can be used to detect if a software meets all its
functional requirements
Detailed Solution:
In White box testing design test cases so that certain program elements are executed (or covered),
design test cases that focus on discovering certain types of faults. So, option a., option b. and option f.
are false about white box testing.
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Indian Institute of Technology Kharagpur

QUESTION 4:
Assume that a function test takes three parameters x, y, and z as arguments. Each of these three
parameters can assume values in the range -100 to +100. How many boundary value test cases with valid
values should be designed?

a. 7
b. 9
c. 11
d. 13
e. 17

Correct Answer: d. 13
Detailed Solution:
In general, need (4z + 1) test cases for z independent inputs. Here z=3, so, 4*3+1=13 test cases
required. Please refer week-2 lecture material (slide no. 39-40).

QUESTION 5:
Consider the function find-intersection(float m1,float c1, float m2, float c2) that computes the
point of intersection of two straight lines of the form y=mx+c. For equivalence class testing, at the first
level of the equivalent class hierarchy the valid and invalid equivalence classes can be formed. The valid set
of input values can be further divided into how many equivalence classes?

a. 1
b. 2
c. 3
d. 4
e. 6

Correct Answer: c. 3

Detailed Solution:
The equivalence classes are the following:
• Parallel lines (m1=m2, c1≠c2)
• Intersecting lines (m1≠m2)
• Coincident lines (m1=m2, c1=c2)
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QUESTION 6:
Which of the following are not combinatorial testing techniques?

a. Decision table-based testing

b. Condition-coverage testing
c. Cause-effect graphing
d. Pair-wise testing
e. Path testing

Correct Answer: b. Condition-coverage testing

e. Path testing

Detailed Solution:
Several types of combinatorial testing strategies:
Decision table-based testing, Cause-effect graphing, Pair-wise testing. Conditional and path testing
part of white box testing.

QUESTION 7:
Which one of the following is an implicit assumption made in equivalence class testing?

a. A program behaves in similar ways to every input value belonging to an equivalence class.
b. Different equivalence classes of a program contain similar bugs
c. Different equivalence classes of a program behave similarly to an input
d. Equivalence classes define the behaviorally similar components of a program
e. Equivalence classes help identify program functions that can be considered to be behaviorally
similar

Correct Answer: a. A program behaves in similar ways to every input value belonging to an
equivalence class.

Detailed Solution:

An implicit assumption made in equivalence class testing is that: A program behaves in similar ways to
every input value belonging to an equivalence class.
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QUESTION 8:
Consider a function that takes an integer a (which can assume integral values between 0 to 100) as
argument and carries out actions involving setting the value of a variable b as specified in the following
table.

Condition Action
(a<10)||(a>80) b=b+10
(a== 30) b=b+20;
(a==40) b=b+30;
For all other cases b=b+40;

During black box testing of the function, how many valid equivalence class test cases with valid input
values are required?
a. 4
b. 5
c. 8
d. 9
e. 10

Correct Answer: b. 5
Detailed Solution:

valid equivalence test cases: a<10 any value, a>80 any value, a=30, a=40 and for other cases a value
of a variable. So, five valid test cases.

QUESTION 9:

Which one of the following techniques is not used to identify the equivalence classes of a unit?
a. Identify scenarios
b. Examine the input data.
c. Analyze program structure
d. Examine output
e. Develop cause-effect model of the program

Correct Answer: c. Analyze program structure

Detailed Solution:
The techniques used to identify the equivalence classes:
Identify scenarios, Examine the input data, Examine output. Please refer week-2 lecture material (slide
no.4) for the same
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QUESTION 10:
Suppose a function named try takes two Boolean variables as input. At least how many valid equivalence
classes needs to be designed for the black-box testing of the function try?
a. 2
b. 4
c. 6
d. 8
e. 10
Correct Answer: b. 4
Detailed Solution:
Two Boolean variables so each of them has two values. So, valid
equivalence classes =2×2=4.

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