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in Problem Solving and Python ProgrammingThese multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Computer Science Engineering (CSE) , Information Technology Engineering (IT) , Electrical Engineering , Civil Engineering , Mechanical Engineering .
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| 151. |
What is the use of “a” in file handling? |
| A. | read |
| B. | write |
| C. | append |
| D. | none of the mentioned |
| Answer» C. append | |
| Explanation: this opens the fhe file in appending mode. that means, it will be open for writing and everything will be written to | |
| 152. |
Which function is used to read all the characters? |
| A. | read() |
| B. | readcharacters() |
| C. | readall() |
| D. | readchar() |
| Answer» A. read() | |
| Explanation: the read function reads all characters fh = open(“filename”, “r”) content = fh.read(). | |
| 153. |
Which function is used to read single line from file? |
| A. | readline() |
| B. | readlines() |
| C. | readstatement() |
| D. | readfullline() |
| Answer» B. readlines() | |
| Explanation: the readline function reads a single line from the file fh = open(“filename”, “r”) | |
| 154. |
Which function is used to write all the characters? |
| A. | write() |
| B. | writecharacters() |
| C. | writeall() |
| D. | writechar() |
| Answer» A. write() | |
| Explanation: to write a fixed sequence of characters to a file | |
| 155. |
Which function is used to write a list of string in a file? |
| A. | writeline() |
| B. | writelines() |
| C. | writestatement() |
| D. | writefullline() |
| Answer» A. writeline() | |
| Explanation: with the writeline function you can write a list of strings to a file | |
| 156. |
Which function is used to close a file in python? |
| A. | close() |
| B. | stop() |
| C. | end() |
| D. | closefile() |
| Answer» A. close() | |
| Explanation: f.close()to close it and free up any system resources taken up by the open file. | |
| 157. |
Is it possible to create a text file in python? |
| A. | yes |
| B. | no |
| C. | machine dependent |
| D. | all of the mentioned |
| Answer» A. yes | |
| Explanation: yes we can create a file in python. creation of file is as shown below. file = open(“newfile.txt”, “w”) file.write(“hello world in the new file\n”) file.write(“and another line\n”) file.close(). | |
| 158. |
Which of the following are the modes of both writing and reading in binary format in file? |
| A. | wb+ |
| B. | w |
| C. | wb |
| D. | w+ |
| Answer» A. wb+ | |
| Explanation: here is the description below “w” opens a file for writing only. overwrites the file if the file exists. if the file does not exist, creates a new file for writing. | |
| 159. |
Which of the following is not a valid mode to open a file? |
| A. | ab |
| B. | rw |
| C. | r+ |
| D. | w+ |
| Answer» B. rw | |
| Explanation: use r+, w+ or a+ to perform both read and write operations using a single file object. | |
| 160. |
Which of the following is not a valid attribute of a file object (fp)? |
| A. | fp.name |
| B. | fp.closed |
| C. | fp.mode |
| D. | fp.size |
| Answer» D. fp.size | |
| Explanation: fp.size has not been implemented. | |
| 161. |
How do you close a file object (fp)? |
| A. | close(fp) |
| B. | fclose(fp) |
| C. | fp.close() |
| D. | fp. close () |
| Answer» C. fp.close() | |
| Explanation: close() is a method of the file object. | |
| 162. |
How do you get the current position within the file? |
| A. | fp.seek() |
| B. | fp.tell() |
| C. | fp.loc |
| D. | fp.pos |
| Answer» B. fp.tell() | |
| Explanation: it gives the current position as an offset from the start of file. | |
| 163. |
How do you rename a file? |
| A. | fp.name = ‘new_name.txt’ |
| B. | os.rename(existing_name, new_name) |
| C. | os.rename(fp, new_name) |
| D. | os.set_name(existing_name, new_name) |
| Answer» B. os.rename(existing_name, new_name) | |
| Explanation: os.rename() is used to rename files. | |
| 164. |
How do you delete a file? |
| A. | del(fp) |
| B. | fp.delete() |
| C. | os.remove(‘file’) |
| D. | os.delete(‘file’) |
| Answer» C. os.remove(‘file’) | |
| Explanation: os.remove() is used to delete files. | |
| 165. |
How do you change the file position to an offset value from the start? |
| A. | fp.seek(offset, 0) |
| B. | fp.seek(offset, 1) |
| C. | fp.seek(offset, 2) |
| D. | none of the mentioned |
| Answer» A. fp.seek(offset, 0) | |
| Explanation: 0 indicates that the offset is with respect to the start. | |
| 166. |
What happens if no arguments are passed to the seek function? |
| A. | file position is set to the start of file |
| B. | file position is set to the end of file |
| C. | file position remains unchanged |
| D. | error |
| Answer» D. error | |
| Explanation: seek() takes at least one argument. | |
| 167. |
Which function overloads the == operator? |
| A. | eq () |
| B. | equ () |
| C. | isequal () |
| D. | none of the mentioned |
| Answer» A. eq () | |
| Explanation: the other two do not exist. | |
| 168. |
Which operator is overloaded by lg ()? |
| A. | < |
| B. | > |
| C. | != |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| Explanation: lg () is invalid. | |
| 169. |
Which function overloads the >> operator? |
| A. | more () |
| B. | gt () |
| C. | ge () |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| Explanation: rshift () overloads the >> operator. | |
| 170. |
Let A and B be objects of class Foo. Which functions are called when print(A + B) is executed? |
| A. | add (), str () |
| B. | str (), add () |
| C. | sum (), str () |
| D. | str (), sum () |
| Answer» A. add (), str () | |
| Explanation: the function add () is called first since it is within the bracket. the function str () is then called on the object that we received after adding a and b. | |
| 171. |
Which function overloads the // operator? |
| A. | div () |
| B. | ceildiv () |
| C. | floordiv () |
| D. | truediv () |
| Answer» C. floordiv () | |
| Explanation: floordiv () is for //. | |
| 172. |
How many except statements can a try- except block have? |
| A. | zero |
| B. | one |
| C. | more than one |
| D. | more than zero |
| Answer» D. more than zero | |
| Explanation: there has to be at least one except statement. | |
| 173. |
When is the finally block executed? |
| A. | when there is no exception |
| B. | when there is an exception |
| C. | only if some condition that has been specified is satisfied |
| D. | always |
| Answer» D. always | |
| Explanation: the finally block is always executed. | |
| 174. |
What happens when ‘1’ == 1 is executed? |
| A. | we get a true |
| B. | we get a false |
| C. | an typeerror occurs |
| D. | a valueerror occurs |
| Answer» B. we get a false | |
| Explanation: it simply evaluates to false and does not raise any exception. | |
| 175. |
Which of the following is not an exception handling keyword in Python? |
| A. | try |
| B. | except |
| C. | accept |
| D. | finally |
| Answer» C. accept | |
| Explanation: the keywords ‘try’, ‘except’ and ‘finally’ are exception handling keywords in python whereas the word ‘accept’ is not a keyword at all. | |
| 176. |
)) type(g) |
| A. | class <’loop’> |
| B. | class <‘iteration’> |
| C. | class <’range’> |
| D. | class <’generator’> |
| Answer» D. class <’generator’> | |
| Explanation: another way of creating a generator is to use parenthesis. hence the output of the code shown above is: class<’generator’>. | |
| 177. |
+ '3' |
| A. | nameerror |
| B. | indexerror |
| C. | valueerror |
| D. | typeerror |
| Answer» D. typeerror | |
| Explanation: the line of code shown above will result in a type error. this is because the operand ‘+’ is not supported when we combine the data types ‘int’ and ‘str’. sine this is exactly what we have done in the code shown above, a type error is thrown. | |
| 178. |
43') |
| A. | importerror |
| B. | valueerror |
| C. | typeerror |
| D. | nameerror |
| Answer» B. valueerror | |
| Explanation: the snippet of code shown above results in a value error. this is because there is an invalid literal for int() with base 10: ’65.43’. | |
| 179. |
Which of the following statements is true? |
| A. | the standard exceptions are automatically imported into python programs |
| B. | all raised standard exceptions must be handled in python |
| C. | when there is a deviation from the rules of a programming language, a semantic error is thrown |
| D. | if any exception is thrown in try block, else block is executed |
| Answer» A. the standard exceptions are automatically imported into python programs | |
| Explanation: when any exception is thrown in try block, except block is executed. if exception in not thrown in try block, else block is executed. when there is a deviation from the rules of a programming language, a | |
| 180. |
Which of the following is not a standard exception in Python? |
| A. | nameerror |
| B. | ioerror |
| C. | assignmenterror |
| D. | valueerror |
| Answer» C. assignmenterror | |
| Explanation: nameerror, ioerror and valueerror are standard exceptions in python whereas assignment error is not a standard exception in python. | |
| 181. |
Syntax errors are also known as parsing errors. |
| A. | true |
| B. | false |
| Answer» A. true | |
| Explanation: syntax errors are known as parsing errors. syntax errors are raised when there is a deviation from the rules of a language. hence the statement is true. | |
| 182. |
An exception is |
| A. | an object |
| B. | a special function |
| C. | a standard module |
| D. | a module |
| Answer» A. an object | |
| Explanation: an exception is an object that is raised by a function signaling that an unexpected situation has occurred, that the function itself cannot handle. | |
| 183. |
exceptions are raised as a result of an error in opening a particular file. |
| A. | valueerror |
| B. | typeerror |
| C. | importerror |
| D. | ioerror |
| Answer» D. ioerror | |
| Explanation: ioerror exceptions are raised as a result of an error in opening or closing a particular file. | |
| 184. |
Which of the following blocks will be executed whether an exception is thrown or not? |
| A. | except |
| B. | else |
| C. | finally |
| D. | assert |
| Answer» C. finally | |
| Explanation: the statements in the finally block will always be executed, whether an exception is thrown or not. this clause is used to close the resources used in a code. | |
| 185. |
Which of these definitions correctly describes a module? |
| A. | denoted by triple quotes for providing the specification of certain program elements |
| B. | design and implementation of specific functionality to be incorporated into a program |
| C. | defines the specification of how it is to be used |
| D. | any program that reuses code |
| Answer» B. design and implementation of specific functionality to be incorporated into a program | |
| Explanation: the term “module” refers to the implementation of specific functionality to be incorporated into a program. | |
| 186. |
Which of the following is not an advantage of using modules? |
| A. | provides a means of reuse of program code |
| B. | provides a means of dividing up tasks |
| C. | provides a means of reducing the size of the program |
| D. | provides a means of testing individual parts of the program |
| Answer» C. provides a means of reducing the size of the program | |
| Explanation: the total size of the program remains the same regardless of whether modules are used or not. modules simply divide the program. | |
| 187. |
Program code making use of a given module is called a of the module. |
| A. | client |
| B. | docstring |
| C. | interface |
| D. | modularity |
| Answer» A. client | |
| Explanation: program code making use of a given module is called the client of the module. there may be multiple clients for a module. | |
| 188. |
is a string literal denoted by triple quotes for providing the specifications of certain program elements. |
| A. | interface |
| B. | modularity |
| C. | client |
| D. | docstring |
| Answer» D. docstring | |
| Explanation: docstring used for providing the specifications of program elements. | |
| 189. |
Which of the following is true about top- down design process? |
| A. | the details of a program design are addressed before the overall design |
| B. | only the details of the program are addressed |
| C. | the overall design of the program is addressed before the details |
| D. | only the design of the program is addressed |
| Answer» C. the overall design of the program is addressed before the details | |
| Explanation: top-down design is an approach for deriving a modular design in which the overall design. | |
| 190. |
In top-down design every module is broken into same number of submodules. |
| A. | true |
| B. | false |
| Answer» B. false | |
| Explanation: in top-down design every module can even be broken down into different number of submodules. | |
| 191. |
All modular designs are because of a top- down design process. |
| A. | true |
| B. | false |
| Answer» B. false | |
| Explanation: the details of the program can be addressed before the overall design too. | |
| 192. |
Which of the following is not a valid namespace? |
| A. | global namespace |
| B. | public namespace |
| C. | built-in namespace |
| D. | local namespace |
| Answer» B. public namespace | |
| Explanation: during a python program execution, there are as many as three namespaces – built-in namespace, global namespace and local namespace. | |
| 193. |
Which of the following is false about “import modulename” form of import? |
| A. | the namespace of imported module becomes part of importing module |
| B. | this form of import prevents name clash |
| C. | the namespace of imported module becomes available to importing module |
| D. | the identifiers in module are accessed as: modulename.identifier |
| Answer» A. the namespace of imported module becomes part of importing module | |
| Explanation: in the “import modulename” form of import, the namespace of imported module becomes available to, but not part of, the importing module. | |
| 194. |
Which of the following is false about “from-import” form of import? |
| A. | the syntax is: from modulename import identifier |
| B. | this form of import prevents name clash |
| C. | the namespace of imported module becomes part of importing module |
| D. | the identifiers in module are accessed directly as: identifier |
| Answer» B. this form of import prevents name clash | |
| Explanation: in the “from-import” form of import, there may be name clashes because names of the imported identifiers aren’t specified along with the module name. | |
| 195. |
Which of the statements about modules is false? |
| A. | in the “from-import” form of import, identifiers beginning with two underscores are private and aren’t imported |
| B. | dir() built-in function monitors the items in the namespace of the main module |
| C. | in the “from-import” form of import, all identifiers regardless of whether they are private or public are imported |
| D. | when a module is loaded, a compiled version of the module with file extension .pyc is automatically produced |
| Answer» C. in the “from-import” form of import, all identifiers regardless of whether they are private or public are imported | |
| Explanation: in the “from-import” form of import, identifiers beginning with two underscores are private and aren’t imported. | |
| 196. |
What is the order of namespaces in which Python looks for an identifier? |
| A. | python first searches the global namespace, then the local namespace and finally the built- in namespace |
| B. | python first searches the local namespace, then the global namespace and finally the built-in namespace |
| C. | python first searches the built-in namespace, then the global namespace and finally the local namespace |
| D. | python first searches the built-in namespace, then the local namespace and finally the global namespace |
| Answer» B. python first searches the local namespace, then the global namespace and finally the built-in namespace | |
| Explanation: python first searches for the local, then the global and finally the built-in namespace. | |
| 197. |
What type of a structure is this?
|
| A. | sequence |
| B. | case |
| C. | repetition |
| D. | process |
| Answer» B. case | |
| Explanation: This is a case structure. Certain cases are given along with a default case in the case structure | |
| 198. |
are identified by their addresses, we give them names (field names / variable names) using words. |
| A. | memory variables |
| B. | memory locations |
| C. | memory addresses |
| D. | data variables |
| Answer» B. memory locations | |
| 199. |
Operators with the same precedence are evaluated in which manner? |
| A. | left to right |
| B. | right to left |
| C. | can’t say |
| D. | none of the mentioned |
| Answer» A. left to right | |
| 200. |
The expression Int(x) implies that the variable x is converted to integer. |
| A. | true |
| B. | false |
| Answer» A. true | |
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