C Sample questions

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PROGRAMMING LANGUAGE ‘C’

1. main()

{

int a=4,b=2;

a=b<>2;

printf("%d", a);

}

a) 32 b) 2 c) 4 d) none

2. main()

{

int *ptr=(int*)malloc(sizeof(int));

*ptr=4;

printf("%d",(*ptr)+++*ptr++);

}

a) 7 b) 9 c) Runtime error d) none

3. #define MAX 3

main()

{

printf("MAX = %d \n",MAX );

#undef MAX

#ifdef MAX

printf("Vector Institute”);

#endif

}

a) MAX=3, Vector Institute b) MAX=3

c) Vector Institute d) Compile time error

4. int array[]={1,2,3,4,5,6,7,8};

#define SIZE (sizeof(array)/sizeof(int))

main()

{

if(-1<=SIZE) printf("1");

else printf("2");

}

a) 1 b) 8 c) 2 d) 4

5. main()

{

int ptr[] = {1,2,23,6,5,6};

printf("%d",&ptr[3]-&ptr[0]);

}

a) 1 b) 2 c) 4 d) none

6. main()

{

char input[] = "SSSWILTECH1\1\1";

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int i, c;

for ( i=2; (c=input[i])!='\0'; i++) {

switch(c) {

case 'a': putchar ('i'); continue;

case '1': break;

case 1: while (( c = input[++i]) != '\1' && c!= '\0');

case 'E': case 'L': continue;

default: putchar(c);continue;

}

putchar(' ');

}

putchar('\n');

}

a) SWITCH b) SSWILI c) SIEH1 d) compile time error

7. main()

{

int a[3][4] ={1,2,3,4,5,6,7,8,9,10,11,12} ;

int i, j , k=99 ;

for(i=0;i<3;i++)

for(j=0;j<4;j++)

if(a[i][j] < k) k = a[i][j];

printf("%d", k);

}

a) 7 b) 9 c) 3 d) 1

8. main()

{

char p[] = "hello world!";

p = "vector";

printf("%s",p);

}

a) vector b) hello world! c) hello world! vector d) none

9. main()

{

enum _tag{ left=10, right, front=100, back};

printf("%d, %d, %d, %d", left, right, front, back);

}

a) 10,0,1,2 b) 10,11,100,102 c) 0,1,2,3 d) none

10. main()

{

char as[] = "\\0\0";

int i = 0;

do{

switch( as[i++]) {case '\\' : printf("A");

break;

case 0 : printf("B"); 3

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break;

default : printf("C");

break;

}

}while(i<3);

}

a) ACB b) ACBC c) BCA d) CBAC

11. main()

{

FILE *fs;

char c[10];

fs = fopen(“source.txt”, ”r”); /* source.txt exists and contains “Vector Institute” */

fseek(fs,0,SEEK_END);

fseek(fs,-3L,SEEK_CUR);

fgets(c,5,fs);

puts(c);

}

a) ute b) itute c) tute d) none

12. main()

{

int a=10,b;

b=a>=5?100:200;

printf("%d\n",b);

}

a) 10 b) 5 c) 100 d) 200

13. main()

{

extern int i;

i =20;

printf("%d\n",sizeof(i));

}

a) 2 b) 4 c) 1 d) none

14. main()

{

int i = 10;

printf(" %d %d %d \n", ++i, i++, ++i);

}

a) 11 11 13 b) 13 11 11 c) 11 12 13 d) 13 12 11

15. main()

{

unsigned int k = 987 , i = 0; 4

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char trans[10];

do {

trans[i++] =(char) (k%16 > 9 ? k%16 - 10 + 'a' : '\0' );

} while(k /= 16);

printf("%s\n", trans);

}

a) bd b) cf c) eg d) none

16. main()

{

struct test

{

char c;

int i;

char m;

} t1;

printf("%d %d\n", sizeof(t1), sizeof(t1.c));

}

a) 4 1 b) 6 2 c) 4 2 d) none

17. main()

{

printf("%x",-1<<4);

}

a) FF00 b) FFFF c) FFF0 d) Compile time error

18. main()

{

int var1=12, var2=35;

printf(“%d”,max(var1,var2));

}

int max(int x, int y)

{

x>y? return x: return y;

}

a) 12 b) 35 c) compile time error d) run time error

19. main()

{

int x, arr[8]={11,22,33,44,55,66,77,88};

x=(arr+2)[3];

printf(“%d”,x);

}

a) 33 b) 66 c) 44 d) 77

20. struct tag{

auto int x;

static int y;

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};

main()

{

struct tag s;

s.x=4;

s.y=5;

printf(“%d”,s.x);

}

a) 4 b) 5 c) 9 d) none

DIGITAL

21. A Bipolar transistor has a total of

a) Two similarly doped regions b) Three alternatively doped regions

c) Two alternatively doped regions d) Three similarly doped regions

22. Which transistor current formula is correct

a) IC=IB+IE b) IB=IC+IE c) IE=IB-IC d) IB=IE-IC

23. BJT is a_______________

a) Voltage controlled device b) rectifier

c) current controlled device d) inverter

24. The sum of binary formats 10101010 and 01111 is __

a) 128 b) 271 c) 200 d) 252

25. Which type of error was eliminated through the use of gray code

a) timing b) decoding c) encoding d) conversion

26. If a parity bit is added to a four bit word, how many output lines will be required after multiplexing ?

a) 5 b) 1 c) 7 d) 9

27. In a 100KHz four-stage frequency divider, if the CLEAR input to stage two is LOW, what will be the fourth

stage output frequency ?

a) 50 KHz b) 12.5 KHz c) 0.0KHz d) 25 KHz

28. How many clock pulses required to load 4-bit SIPO register and transfer the data to a output register.

a) 16 b) 8 c) 5 d) 4

29. Which type of device may be used to interface a parallel data format with an external equipments serial

format ?

a) Key matrix b) Memory chip c) UART d) SIPO

30. If 00000111 in a register is shifted to read 00111000, the arithmetic operation is

a) X2 b) X4 c) X16 d) X8

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Micro Processor (8085/8086): ( Select either [ ] 8085 / [ ] 8086 )

8085:

31. The 8085 microprocessor is an ___ bit microprocessor. It is a _____ pin IC.

a) 8 , 20 b) 16 , 40 c) 16 , 20 d) 8 , 40

32. The following are true about 8085 except that, ______.

a) It is manufactured by using NMOS technology

b) It is having on-chip clock generation facility

c) It has 8 address lines

d) Lower order address bus is multiplexed with data bus

33. The status register or flag register of 8085 include ______ flags.

a) 3 b) 5 c) 7 d) 9

34. The data conditions, after execution of an arithmetic or logical operations are indicated by setting or resetting

the ___________ called flags.

a) Flip-flops b) latches c) registers d) gates

35. Address Latche Enable(ALE) signal is used to de-multiplex ________ and _________ buses.

a) Address , data b) Address, control c) Data,control d) None of the above

36. SID and SOD signals are used _______________.

a) For Serial communication b) For DMA operation

c) By slow operating peripherals d) None of the above

37. In the 8085, the machine cycle may consists of _______ to _______ T-states.

a) 2, 4 b) 3,6 c) 2,8 d) 3,8

38. The 8085 instruction cycle consists of one to five machine cycles.The first machine cycle of each instruction

cycle is always _____________ machine cycle.

a) I/O read b) I/O write c) Memory read d)None of the above

39. The ______ instruction is Machine control instruction.

a) HLT b) PUSH c) IN d) LDA

40. The number of ways in which the operand information is specficied in the instruction code are ______.

a) 4 b) 5 c) 12 d) 24

41. The data bus of any microprocessor is always

a) Unidirectional b) Bi-directional

c) Either unidirectional or bi-directional d) None of the above

42. In a microprocessor based system, the stack is always in

a) Microprocessor b) RAM c) ROM d) EPROM

43. In 8085 microprocessor ,the I/O devices can be used in

a) Memory mapped I/O only b) I/O mapped I/O only

c) Memory mapped I/O or I/O mapped I/O d) None of the above

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44. In 8085 micprocessor,in response to RST 7.5 interrupt the execution is transferred to memory location.

a) 0000H b) 002CH c) 0034h d) 003CH

45. Which of the data transfer is not possible in 8085 microprocessor ?

a) Memory to accumulator b) Accumulator to memory

c) Memory to memory d) I/O device to accumulator

46. _________type of ADC is the fastest type of ADC.

a) Flash b) Counter c) Dual slope d) Successive approximation

47. The number of comparators in a 4-bit flash type ADC is ________ .

a) 4 b) 5 c) 15 d) 16

48. An ADC is usually considered as an _________.

a) Encoder b) Decoder c) Tri-State Logic d) None of the mentioned

49. The resolution of a 4 bit counting ADC is 0.5 volts. For an analog input of 6.6 volts,the digital output of the

ADC will be _______ .

a) 1011 b) 1101 c) 1100 d) 1110

50. There are _____ types of DAC’s avaible.

a) 2 b) 3 c) 4 d) 5

8086:

31. What is the maximum clock frequency in 8086?

a) 4MHz b) 5MHz c) 6MHz d)7MHz

32. Size of the IP reg in 8086 is------

a) 8 bits b) 16 bits c) 20 bits d) 24 bits

33. ------register can be changed directly using POP instruction

a) ss b) es c)ds d) cs

34. SIM is-------------------

a) serial interrupt mask. b) set interrupt monitor

c) set interrupt mask d) serial interrupt monitor

35. What is the size of the instruction queue?

a) 4 bytes b) 6 bytes c) 8 bytes d) 2 bytes

36. What is the size of each segment in 8086?

a)12kb b) 32kb c) 64kb d)128kb

37. Which micro processor accepts the program written for 8086 with out any changes

a) 8085 b) 8087 c) 8088 d) 80286

38. Which are the basic parts of 8086?

a) BIU b) EU c) pipelining d) a and b

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39. 8086 is -------bit microprocessor?

a)8 b)16 c)20 d) 24

40 among all which one is co –processor for 8086?

a) 8085 b) 8087 c) 8088 d) 80286

41. How many general purpose registers available in 8086?

a) 4 b) 8 c) 10 d) none

42. -----------------reg (in 8086)contains the address of the next instruction to be fetched?

a) bp b) sp c) pc d) ip

43. Which Segment is used to store interrupt and subroutine return address registers.

a) ss b) es c) ds d) cs

44. Which Flag can be set or reset by the programmer and also used to control the operation of the processor?

a) trace b) interrupt c) direction d) all

45. Give example of maskable interrupt?

a) RST 7.5 b) RST 6.5 c) TRAP d) a and b

46. MOV Cx, 1234H instruction belongs to which addressing mode ?

a) Register b) memory c) direct d) Immediate

47. 8086 instructions varied from ----------- to ---------- bytes ?

a) 1 to 2 bytes b) 1 to 3 bytes c) 1 to 4 bytes d) none

48. 8086 prefetches only when at least ------------ bytes are free in queue.

a) 4 b) 3 c) 2 d) 1

49. An RS-232 interface is

a) a parallel interface b) a serial interface c) printer interface d) a modem interface

50. 8086 has -------------- flag signals.

(a) 3 b) 5 c) 7 d) 9

BASIC ELECTRONICS & CIRCUITS

51. A charged Capacitor, it __________?

a) blocks A/C b) blocks DC c) Allows both A/c, DC d) Blocks both A/C, DC

52. A lightning bolt carrying 15,000 A lasts for 100 μs. If the lightning strikes an airplane flying at 2km, the charge

deposited on the plane is

a) 13.33 μC b) 75 C c)1500 μC d) 1.5 C

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53. If 120 C of charge passes through an electric conductor in 60 sec, the current in the conductor is

a) 0.5 A b) 2 A c) 3.33 mA d) 0.3 mA

54. The energy required to move 120 coulomb through 3 V is

a) 25 mJ b) 360 J c) 40 J d) 2.78 mJ

55. For the figure given below, i = ?

a) 1 A b) 2 A c) 3 A d) 4 A

56. Each branch of circuit graph of figure given below represent a circuit element. The value of the voltage v1 is

a) – 30 V b) 25 V c) – 20 V d) 15 V

57. For the figure given below, v0 = ?

a) 10 V b) 15 V c) 20 V d) None

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58. For the figure given below, R1 = ?

a) 25 Ω b) 50 Ω c) 100 Ω d) 2000 Ω

59. Twelve 6 Ω resistor are used as edge to form a cube. The resistance between two diagonally opposite

corner of the cube is

a) (5/6) Ω b) (6/5) Ω c) 5 Ω d) 6 Ω

60. For the figure given below, v1 = ?

a) – 11 V b) 5 V c) 8 V d) 18 V

APTITUDE

61. The sum of a number and the number preceding it is 33. By how much is two less than six times the

number?

a) 196 b) 94 c) 90 d) 100

62. If the length and breadth of a room are increased by y feet each, the perimeter increases by 16 feet. Find y

a) 8 b) 2 c) 6 d) 4

63. One-fourth of a number is greater than one-fifth of the number succeeding it by 1. Find the number.

a) 24 b) 42 c) 36 d) 48

64. An oil cylinder was 3/4th full. When two bottles of oil is poured into it, it is 4/5th full. How many bottles of oil

can the full cylinder hold?

a) 20 b) 15 c) 40 d) 30

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65. The ratio of present age of A and B is 4:3. A will be 26yrs old in 6yrs from now. How old is B now?

a) 15yrs b) 20yrs c) 25yrs d) 10yrs

66. A profit of Rs. 500 is divided between X and Y in the ratio of ½ : 1/3 .What is the difference between their profit

shares ?

a) Rs. 200 b) Rs. 100 c) Rs. 300 d) Rs. 50

67. The sum of the present ages of A, B, C is 45 yrs. Three years ago their ages were in the ratio 1:2:3. What

is the present age of A

a) 10yrs b) 6yrs c) 8yrs d) 9yrs

68. If the denominator of a fraction is increased by 4, then the fraction becomes 5/8. If the numerator is 11

less than the denominator, find the numerator.

a) 25 b) 20 c) 30 d) 35

69. 15-mangoes and 7-apples cost as much as 10-mangoes and 9-apples. What is the ratio of cost of one

mango to cost of one apple?

a) 2:5 b) 5:2 c) 3:4 d) Cannot be determined

70. A person sold his watch for 96 $ and got some percentage of profit which was numerically equal to the cost

price. What is the cost price of the watch

a) 50 $ b) 54 $ c) 60 $ d) 80 $

71. Tap A can fill an empty tank in 6-hours and Tap B can empty the full tank in 8-hours. If the tank is empty when

tap A is opened at 9:00 am and tap B is opened at 11:00 am, then at what time is the tank filled?

a) 6:00pm b) 3:00 am c) 3:00pm d) 6:00am

72. 20 men can plant 50 saplings in 8-hours. In how many hours can 15men plant 80 saplings?

a) 17 1/25 b) 12 7/11 c) 20 d) None of these

73. A man can row at 6 km/h in still water and at 4 km/h upstream. How long will the man take to go to a place

1 km downstream and return?

a) 36 min b) 24 min c) 12 min d) 18min

74. Some telegraph poles are placed 20 m apart. How many poles will a train pass in 3-hours at 60km/h ?

a) 1200 b) 2500 c) 4000 d) 9000

75. A hollow rectangular metal box of outer dimensions 30cmx24cmx18cm and of thickness 3cm is melted to

form a solid cube. What is the measure of side of the cube (in cm)?

a) 36√36 b) 6 c) 18 3√36 d) 6 3√36

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