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Right answer is (a) measured in radians

To EXPLAIN: The cos FUNCTION COMPUTES the COSINE of x (measured in radians).

The CORRECT option is (a) math.h

Explanation: The header file math.h DECLARES all the MATHEMATICAL FUNCTIONS and macros.

The correct option is (b) OBJECT

Best EXPLANATION: An object of TYPE va_list has to be created in order to ACCESS the varying ARGUMENTS.

The correct answer is (b) bsearch()

To EXPLAIN I WOULD say: bsearch() FUNCTION is USED tosearch an array of objects, the initial ELEMENT is pointed by base, for an element that matches the object is pointedby key. The size of each element of the array is specified by size.

Right answer is (d) assert

The best I can explain: The header file assert.h of the C Standard Library defines a macro CALLED assert is used to verify assumptions made by the program and PRINT a DIAGNOSTIC message if this ASSUMPTION is false.

The correct choice is (B) an integer number

The explanation: int abs (int i);

The abs() FUNCTION is used to COMPUTE the ABSOLUTE value of an integer i. If the result cannot be REPRESENTED, the behavior is undefined.

The correct choice is (a) malloc() does not SET the memory to zero WHEREAS calloc() SETS allocated memory to zero

To EXPLAIN: The DIFFERENCE in malloc() and calloc() is that calloc() sets the memory to zero whereas malloc()does not sets allocated memory to zero.

The CORRECT answer is (B) va_arg

For explanation: va_arg is the C LIBRARY macro defined under stdarg.h which RETRIEVES the next argument in the PARAMETER list of the function.

Correct ANSWER is (d) EXIT_SUCCESS

To explain: SEEK_CUR and SEEK_END is DEFINED under stdio.h, CLOCKS_PER_SEC is defined under time.h, EXIT_SUCCESS is defined under stdlib.h.

EXIT_SUCCESS specifies value for status argument to exit INDICATING SUCCESS.

Correct option is (a) int quot and int rem

Easy explanation - A structure of type div_t is returned by the FUNCTION DIV(), contains both the QUOTIENT and the REMAINDER. The structurecontains two members,

 int quot; /* quotient */

int rem; /* remainder */

Right answer is (b) ABORT()

To EXPLAIN I would say: void abort (void);

The abort() function causes ABNORMAL PROGRAM termination to OCCUR, and comes out directly from that place.

Correct CHOICE is (a) atof(const char *STR)

The explanation is: The atof function converts the initial portion of the string pointed to by str to double representation. Except for the behavior on the error, it is equivalent to strtod (nptr, (char **)NULL).

Right choice is (a) tanh(DOUBLE X)

The EXPLANATION: The correct code is tanh(double x). The tanh() function computes the HYPERBOLIC TANGENT of x.

The correct answer is (a) true

The EXPLANATION is: When the EXPRESSION in the macro void ASSERT(INT expression) is zero then the macro DISPLAYS error message on stderr.

Correct choice is (a) true

Easy explanation - double ldexp(double X, int exp);

The ldexp function multiplies a floating-point number by an integral POWER of 2. A range error may OCCUR. The ldexp() function RETURNS the value of x times 2 raised to the power exp.

The CORRECT choice is (C) three

The BEST I can explain: The HEADER file stdarg.h has three macros DEFINED in it.

Right answer is (a) true

The EXPLANATION: mbstowcs() function RETURNS the number of array elements that are modified. It does not return a terminating zero code if any. The mbstowcs() function is used to convert a SEQUENCE of MULTIBYTE characters that begins in the initial SHIFT state from the array pointed to by, into a sequence of corresponding codes.

Correct OPTION is (a) div()

To explain: div_t div(int num, int den);

The div () function is USED to COMPUTE the QUOTIENT and remainder of the division of the NUMERATOR num by the denominator den.div_t is the structure which contains a quotient member and a remainder member.

The correct CHOICE is (c) NULL pointer

To explain: The pointer returned points to the lowest BYTE address of the allocated space. A null pointer is returned, if the space cannot be allocated.

Right choice is (c) strtoul()

To EXPLAIN: UNSIGNED long INT strtoul(const char *p, char **PTR, int base) function is used toconvert the initial part of the string in p to an unsigned long int value ACCORDING to the given base,it must be between 2 and 36 inclusive, or be the special value 0.

Correct choice is (b) false

Easiest EXPLANATION - sqrt(X) function is generally much faster than the APPARENT equivalent POW (x, 0.5).

Right answer is (d) EXP X

The best I can EXPLAIN: The exp(x) FUNCTION computes the exponential function of x.

The correct option is (c) cosh(X)

To explain I would SAY: The cosh() function computes the HYPERBOLIC cosine of x. The cosh function returns the hyperbolic cosine VALUE.

The correct CHOICE is (a) true

The BEST I can explain: If the RESULT UNDERFLOWS i.e the magnitude of the result is very small to be represented in an object of the specified type, the function RETURNS zero.

The correct answer is (b) The atexit() functionis used to return ZERO if the registration succeeds, nonzero if it fails

Easiest EXPLANATION - The prototype of FUNCTION isint atexit (void (*FUNC) (void) );

The atexit() function is used to register the function POINTED to by func, to be called without arguments at normal program termination.

Correct answer is (a) true

Easiest explanation - RAND_MAX is the macro which EXPANDS to an INTEGRAL constant EXPRESSION, the value of which is the maximum value RETURNED by the rand function.