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Placement Papers Wipro

11530.12 members were present at a board meeting. Each member shake hands with all of the other members before and after the meeting .How many hand shakes were there?
130
134
132
135
Explanation:

In order to have a hand shake there must be two members. Therefore to select 2 out of 12 we have 12C2.

This happens twice that is before and after the meeting

Answer = 12C2 × 2 = 132.

11531.An emergency vehicle travels 10 miles at a speed of 50 miles per hour. How fast must the vehicle travel on return trip if the round trip travel time is to be 20 minutes?
75 mph
70 mph
65 mph
80 mph
Explanation:

Going trip time = t = dsds = 1050 × 601050 × 60 = 12 minutes.

Given total time = 20 minutes

Return trip time = Total time - Going trip time = 20 - 12 = 8 minutes = 860860 hours.

As the distance is 10 miles during even return trip,

The return speed = dtdt = 1086010860 = 10 × 60810 × 608 = 75 mph.

11532.Mary and John can do a piece of work in 24 day; John and Vino in 30 days;Vino and Mary in 40 days. If Mary, John and Vino work together they will complete work in ?
10 days
20 days
47 days
45 days
Explanation:

Given that

Mary and John take 24 days; i.e., (Mary + John)`s 1 day`s work = 124124

John and Vino take 30 days; i.e., (John + Vino)`s 1 day`s work = 130130

Vino and Mary take 40 days; i.e., (Vino + Mary)`s 1 day`s work = 140140

Adding above 3 equations, we get,

[(Mary + John) + (John + Vino) + (John + Vino)]`s 1 day`s work = 124+130+140124+130+140

2((Mary + John + Vino)`s 1 days work = 124+130+140124+130+140

2(Mary + John + Vino)`s 1 days work = 5+4+31205+4+3120 = 110110

Therefore, (Mary + John + Vino)`s 1 days work = 120120

i.e., Mary, John and Vino together can complete the work in 20 days.

11533.My friend collects antique stamps. She purchased two, but found that she needed to raise money urgently. So she sold them for Rs. 8000 each. On one she made 20% and on the other she lost 20%. How much did she gain or lose in the entire transaction?
she lost Rs 500.67
she lost Rs 666.67
she gain Rs 666.67
she gain Rs 500.67
Explanation:
Let buying price of Ist stamp be Rs.x
Then
8000 - 0.2x = x
x = 8000/1.2
x = Rs.6666.67

Let buying price for IInd stamp be Rs.Y
Then
8000+0.2x = y
y = 8000/0.8
Y = Rs. 10000

Total money spend on purchasing the stamps
= x+y
= 6666.67+10000
= Rs.16666.67

Total money earned by selling the stamps = Rs.8000+8000
= Rs. 16000

Loss = Buying price - selling price
= Rs. 16666.67-16000
= Rs. 666.67 (Answer)
11534.If the sum of n terms of two series in A.P. are in the ratio (5n + 4) : (9n + 6) then find the ratio of their 13th terms.
129231129231
1212
23152315
None of the above
Explanation:

Formula for sum of n terms in AP = SnSn = n2(2a + (n - 1)d ]

5n + 4 => 5(n - 1) + 9 => [2(92)+(n-1)5][2(92)+(n-1)5]

Common difference (d) = 5, First term (a) = 9292

Similarly

Second series given 9n + 6 =>=> 9(n - 1) + 15 ? [2(152)+(n-1)9][2(152)+(n-1)9]

Common difference (d) = 9, First term (a) = 152152

So

13th term for first series is = a + 12d = 12921292

13th terms for second series is = a + 12d = 23122312

Ratio = 129231

11535.A team P of 20 engineers can complete work or task in 32 days. Another team Q of 16 engineers can complete same task in 30 days.Then the ratio of working capacity of 1 member of P to the 1 member of Q is
3 : 2
4 : 3
2 : 5
3 : 5
Explanation:

Let the capacity of an engineer in P = x units, and in Q = y units.

Working capacity of P = x × 32 × 20

Working capacity of Q = y × 16 × 30

As the total work is same, we equate the above equations.

=> x × 32 × 20 = y × 16 × 30

=> xy = 16 × 30 × 32 × 20 = 34

11536.Ravi`s salary was reduced by 25%. Percentage increase to be effected to bring salary to original level =
20%
25%
33.33%
None of the above
Explanation:

Let the Salary be 100.

Salary was reduced by 25%. So present salary = 75.

Percentage has to be increased in order to get Original level = 2575 × 1002575 × 100 = 33.33 %

11537.An ore contains 25% of an alloy that has 90% iron. Other than this, in remaining 75% of the ore ,there is no iron. How many kgs of the ore are needed to obtain 60 kg. of pure iron.?
250
275
300
266.66
Explanation:

Let us take 100x kgs of ore. Now it contains 25x kgs of alloy and it contains 90% (25x) kgs of iron.

90% (25x) = 60 kg => x = 60 × 10090 × 12560 × 10090 × 125 = 8383

So iron ore required = 100 × 8383 = 266.66

11538.Find the day of the week on 16th july, 1776.
Sunday
Monday
Tuesday
Wednesday
Explanation:

Split the year 1775 + 16th july 1776

Till 1600 years no odd days.

1601 to 1700 = 5 odd days

1701 to 1775 = 75 + 18 = 93 = 2 odd days. (75 years has 93 odd days (=> 18 leap + 57 non leap years)

upto 15th july 1776 = 31 + 29 + 31 + 30 + 31 + 30 + 15 = 197 = 1 odd day.

Total odd days = 5 + 2 + 1 = 8 = 1 odd day.

So one day after Monday. That is Tuesday.

11539.The radius of a sphere is increased by 50%. The increase in surface area of the sphere is :
100%
125%
150%
200%
Explanation:

Take radius 100. Then surface area is 4 × pp × 100 × 100.

After increase radius by 50% the radius becomes100 + 50% of 100 = 150

Then new surface area is 4 × $\pi^2$ × 150 × 150

Then put the values into formula of percentage = 4$\pi$1502 - 4$\pi$10024$\pi$1002 × 1004$\pi$1502 -4$\pi$10024$\pi$1002 × 100 = 125%

11540.On 8th Dec, 2007 Saturday falls. What day of the week was it on 8th Dec, 2006?
Sunday
Thursday
Tuesday
Friday
Explanation:

8th Dec 2007 - 8th Dec 2006 = 52 weeks 1 day. So Dec 8th 2006 is behind one day = Friday.

11541.Which one of the following option is the closest in the meaning to the word given below..MITIGATE
Diminish
Divulge
Dedicate
Denote
Explanation:

Mitigate means to make something less severe. Divulge means reveal. Denote means indicate. Diminish means to make or to cause something to become less in size, importance etc.

11542.On increasing the price of T.V. sets by 30%, their sale decreases by 20%. What is the effect on the revenue receipts of the shop ?
4% increase
4% decrease
8% increase
8% decrease
Explanation:

Let the price be = Rs.100, and number of units sold = 100

Then, sale value = Rs.(100 × 100) = Rs.10000

New sale value = Rs.(130 × 80) = Rs.10400

Increase% = 4001000040010000 × 100 = 4%

11543.In an examination, 35% of total students failed in Hindi, 45% failed in English and 20% in both. The percentage of these who passed in both the subjects is :
10%
20%
30%
40%
Explanation:

Formula n(a?b) = n(a) + n(b) - n(anb)

Fail in Hindi or English = 35 + 45 - 20 = 60

Therefore students who passed = 100 - 60 = 40.

11544.Find the angle between the minute hand and hour hand of a click when the time is 7.20?
100 degrees
200 degrees
50 degrees
80 degrees
Explanation:
Answer: 100 degrees
11545.A contractor undertook to make 15 km of roadway in 40 weeks. In 10 weeks, 3 km was complete by 180 men working 8 hours a day. The men then agreed to work 1 hour a day overtime, And some boys were engaged to assist them, the work was finished in the stipulated time(40 weeks). How many boys were employed, if the work of 3 boys is equal to that of 2 men?
70
50
60
80
Explanation:

Let the capacity of man = 3 units, and boy = 2 units per hour.

Now total work = 3 × 180 × 8 × 7 × 10 = 3 km. - - - - - - - (1)

Let k boys were recruited. Now total work = (3 × 180 + 2 × k) × 9 × 7 × 30 = 12km. - - - - - - (2)

By dividing 2nd equation by 1st,

=> (540+2k) × 9 × 7 × 303 × 180 × 8 × 7 × 10 = 4(540+2k) × 9 × 7 × 303 × 180 × 8 × 7 × 10 = 4

=> k = 50.

11546.A can do a piece of work in 10 days, B in 15 days. They work for 5 days. The rest of work finished by C in 2 days.If they get Rs 1500 for the whole work, the daily wages of B and C are?
Rs 225
Rs 25
Rs 250
Rs 20
Explanation:

Let the total work = 30 units.

Then capacity of A = 3 units, B = 2 units. Now they worked for 5 days. So they must have completed 25 units.

Rest of the work 5 units done by C in 2 days. So C capacity = 5/2 = 2.5 units.

Given that toatal wages are Rs.1500 for 30 units. So for 1 unit of work they get Rs.50. Now B and C per day

work = (2 + 2.5) = 4.5 units. So their daily wages = 4.5 $\times$ 50 = Rs.225.

11547.The average of ten numbers is 7 .If each number is multiplied by 12 , then the average of new set of numbers is ?
7
19
82
84
Explanation:

If each number is multiplied by K, then the new average increases by K times. So new average = 84

11548.In an examination, a student scores 4 marks for every correct answer and loses 1 mark for every wrong answer. If he attempts all 75 questions and secures 125 marks, the number of questions he attempts correctly, is ?
35
40
42
46
Explanation:

Let the number of correct answers be x.

Then numbers of incorrect answers will be 75 - x

We get 4x - (75 - x) × 1 = 125

On solving the equation we get x= 40.

11549.A car moves at the speed of 80 km/hr. what is the speed of the car in metres per second?
8 m/sec
20 × 1919 m/sec
21 × 2929 m/sec
22 × 2929 m/sec
Explanation:

For convert km/hr into m/sec multiply the speed with 518518

For convert m/sec into km/hr multiply the speed with 185185

80 × 518518 => 22 × 2929 m.sec.

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