3i Infotech Papers: Sample Questions 72  74 of 1245
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Question number: 72
» Aptitude
Question
A boat travels 20 kms upstream in 6 hours and 18 kms downstream in 4 hrs. Find the speed of the water current?
Choices
Choice (4)  Response  

a.  5 kmph 

b.  kmph 

c.  kmph 

d.  None of the above 

Answer
b.Explanation
Let the speed of boat and speed of water be u and v kmph respectively.
Boat travels 20 km upstream in 6 hours, i. e. ……. (i)
Boat travels 18 km downstream in 4 hours, i. e. ……. (ii)
We are asked to find the speed of water, i. e. v.
Subtracting both the equations,
kmph
So, speed of water will be kmph.
Question number: 73
» Aptitude
Question
15 men take 21 days of 8 hrs each to do a piece of work. How many days of 6 hrs each would it take for 21 women if 3 women do as much work as 2 men?
Choices
Choice (4)  Response  

a.  30 

b.  19 

c.  20 

d.  29 

Answer
a.Explanation
15 men are taking 21 days of 8 hours to do a piece of work.
Here, it is given that work done by 3 women is equal to work done by 2 men.
We are asked to find in how many days 21 women can complete the same work working 6 hours for a day.
Let the days required by women will be x.
So,
So,
So, 21 women will require 30 days to complete the work if they are working for 6 hours.
Question number: 74
Question
Purpose of PC (Program Counter) in a Microprocessor is
Choices
Choice (4)  Response  

a.  Count the number of instructions 

b.  To store address of next instruction to be executed 

c.  To store base address of the stack 

d.  To store address of TOS (Top Of Stack) 

Answer
b.Explanation
The program counter, PC, is a specialpurpose register that is used by the processor to hold the address of the next instruction to be executed. It automatically gets incremented to point to the next instruction during the opcode decode cycle. When computer is reset or gets restarted, Program Counter normally reverts to 0.