Aptitude Questions and Answers

Showing 21 - 30 of 117 questions

If 9^th of the month falls on the day preceding Sunday, then on what day will 1^st of the month fall?

Friday

Saturday

Sunday

Monday

correct answer a

As per the question 9^th of the Month=Saturday. (Day preceding Sunday)

Day name repeats after 7 days.

Therefore 9 minus 7=2^nd of the given month is also Saturday.

Then 1^st of the given month= Saturday Minus one day = Friday

The average of five numbers is 27. If one number is excluded, the average becomes 25. The excluded number is ?

correct answer b

(27*5)-(25*4)

135-100

A man can do a piece of work in 60 hours. If he takes his son with him and both work together then the work is finished in 40 hours. How many hours will the son take to do the same job, if he worked alone on the job?

100

120

correct answer d

If the man takes 60 hours to complete the work, then he will finish (1/60)thof the work in 1 hour.

Let us assume that his son takes x hours to finish the same work.

If they work together for 1 hour they will finish `1/60 + 1/x = 1/40` of the work.

Therefore,

x=120

The son, working alone would take 120 hours to complete the work.

I forgot the last digit of a 7 digit telephone number. If one randomly dial the final three digits after correctly dialling the four, then what is the chance of dialling the correct number?

`1/1000`

`1/1001`

`1/999`

`1/990`

correct answer a

It is given that last three digits are randomly dialled. Then each of the digit can be selected out of 10 digits in 10 ways.

Hence required probability

= `1/10 * 1/10 * 1/10`

= `1/1000`

Find the remainder when 67⁹⁹ is divided by 7.

correct answer c

Remainder of `((67^99)/7)`==R==>`((63+4)^99)/7`

63 is divisible by 7 for any power, so required remainder will depend on the power of 4.

Require remainder:
`(4^99)/7==R==>(4^(96+3))/7`
`4^3/7==> 64/7==> (63+1)/7==R==>1`

On 5th December 1993, Nirmala and Raju celebrated their anniversary on Sunday. What will be the day of their anniversary in 1997 ?

Wednesday

Thursday

Friday

Tuesday

correct answer c

Normal year jump +1 gain; Leap year jump +2 gain.

Years	Day Gain
1994	1
1995	1
1996 (leap year)	2
1997	1
Total days	5

Sunday plus five days

Monday
Tue
Wed
Thursday
Friday

A sum of money placed at compound interest doubles itself in 4 years. In how many years will it amount to 8 times?

9 years

8 years

27 years

12 years

correct answer d

Let,
Principal = Rs. 100.
Amount = Rs. 200.
Rate = r%
Time = 4 years.
Now,
`A = P*[1+ (r/100)]^n`;
`200 = 100*[1+(r/100)]^4`;
`2 = [1+(r/100)]^4`; ........... (i)
If sum become 8 times in the time n years,
then,
`8 = (1+(r/100))^n`;
`2^3 = (1+(r/100))^n`; ........(ii)
Using eqn (i) in (ii), we get;
`([1+(r/100)]^4)^3 = (1+(r/100))^n`;
`[1+(r/100)]^12 = (1+(r/100))^n`;
Thus, n = 12 years.

The average temperature for Wednesday, Thursday and Friday was 40^oC. The average for Thursday, Friday and Saturday was 41^oC. If temperature on Saturday was 42^oC, what was the temperature on Wednesday?

39 degree celsius

44 degree celsius

38 degree celsius

41 degree celsius

correct answer a

Average temperature for Wednesday, Thursday and Friday = 40^oC
Total temperature = 3*40 = 120^oC
Average temperature for Thursday, Friday and Saturday = 41^oC
Total temperature = 41*3 = 123^oC
Temperature on Saturday = 42^oC
Now,
(Thursday + Friday + Saturday) - (Wednesday + Thursday + Friday) = 123-120;
Saturday - Wednesday = 3
Wednesday = 42-3 = 39^oC.