## Scientific Assistance CS 15-10-2017

Question 1 |

The difference between the compound interest and the simple earned at the end of 3 rd year on a sum of money at a rate of 10% per annul is Rs. 77.5. What is the sum?

Rs. 3,500 | |

Rs. 2,500 | |

Rs. 3,000 | |

Rs. 2,000 |

Question 1 Explanation:

Let principal be ‘x’

S.I = P T R / 100

S.I = X * 3 * 10 / 100

C.I = [ P (1 + (R / 100)

C.I = [ X (1+ (10 / 100)

C.I = 331X / 1000

Difference between Compound interest and Simple interest is 77.5

( 331X / 1000 ) - ( 3X / 10) = 77.5

31x / 1000 = 77.5

x = 2500.

S.I = P T R / 100

S.I = X * 3 * 10 / 100

C.I = [ P (1 + (R / 100)

^{T}) - P]C.I = [ X (1+ (10 / 100)

^{3}) - X]C.I = 331X / 1000

Difference between Compound interest and Simple interest is 77.5

( 331X / 1000 ) - ( 3X / 10) = 77.5

31x / 1000 = 77.5

x = 2500.

Question 2 |

Aamir and Birju can cut 5000g of wood in 20 min. Birju and Charles can cut 5000g of wood in 40 min. Charles and Aamir cut 5 kg of wood in 30 min. How much time Charles will take to cut 5 kg wood alone?

120 min | |

48 min | |

240 min | |

120 min |

Question 2 Explanation:

Here in this question 5000g means 5kg only

So from that question Aamir (A) Birju (B) Charles (C)

Let Aamir, Birju and Charles alone can complete the work in A, B and C minutes respectively, then

1 min. work of (A+B)=1/20, (B+C)=1/40 and (C+A)=1/30

A + B + C = 13/240

1 min. work of C = (A+B+C) - (A+B) = 13/240 - 1/20 = 1/240

So C alone can complete the work in 240 min.

So from that question Aamir (A) Birju (B) Charles (C)

Let Aamir, Birju and Charles alone can complete the work in A, B and C minutes respectively, then

1 min. work of (A+B)=1/20, (B+C)=1/40 and (C+A)=1/30

A + B + C = 13/240

1 min. work of C = (A+B+C) - (A+B) = 13/240 - 1/20 = 1/240

So C alone can complete the work in 240 min.

Question 3 |

An alloy contains copper and zinc in the ratio 5 : 3 and another contains copper and tin in the ratio 8 : 5, If equal weights of the two are melted together to form a 3 rd alloy, find the weight of tin per kg in the new alloy.

40/129 | |

5/13 | |

5/26 | |

28/5 |

Question 3 Explanation:

Amount of copper in first alloy is 5x/8 and zinc is 3x/8.

Amount of copper in second alloy is 8x/13 and tin is 5x/13.

So after mixing tin is available in 2 alloy only that means in 3rd alloy 5x/13/2x

Tin present in 3rd alloy is 5/26.

Amount of copper in second alloy is 8x/13 and tin is 5x/13.

So after mixing tin is available in 2 alloy only that means in 3rd alloy 5x/13/2x

Tin present in 3rd alloy is 5/26.

Question 4 |

X is a whole number. If the only common factors of X and X2 are 1 and X, then X is _______

1 | |

a perfect square | |

an odd number | |

a prime number |

Question 4 Explanation:

A number that is divisible only by itself and 1 is called prime number.

Question 5 |

Line AB is 24 metres in length and tangent to the inner one of the two concentric circles at point C, Points A and B lie on the circumference of the outer circle. It is known that the radii of the two circles are integers. The radius of the outer circle is

13m | |

5 m | |

7 m | |

4m |

Question 5 Explanation:

Given data,

AB=24cm

CB=12cm

θC=5cm(Assume)

θB=5

^{2} +12

^{ 2} =169

θB=13cm

Note: They forgot to mention the value 5. If we are considering value=5 then answer should be A.

Question 6 |

Monisha is working with a real estate agent to find a location for the kids’ toy store she plans to open in her town. She is looking for a place that is either in the centre or not too far from the centre of town. It should also be attractive for the right kind of footfall too. Which of the following locations should Monisha’s agent call to her attention?

a storefront in a new high-rise building near the train station in the center of town whose occupants are mainly young, childless professionals who use the train to commute to their offices each day | |

a little shop three blocks away from the town’s main street, located across the street from an elementary school and next door to an ice cream store | |

a stand-alone storefront on a quiet residential street ten blocks away from the town’s center | |

a storefront in a small a strip mall located on the outskirts of town that is also occupied by a pharmacy and a dry cleaner |

Question 6 Explanation:

This option is both near the center of town and in a location where children and their parents are sure to be around. This is the only option that meets both of Monisha’s requirements.

Question 7 |

Reading is a psycholinguistic guessing game. To read critically is a skill as it is a demanding process. One must slow down one’s reading and, with a pencil in hand, perform specific operations on the text. Mark up the text with reactions, conclusions and questions. When one reads, one becomes an active participant.

critical reading is a slow, dull, but essential process. | |

the best critical reading happens at critical times in a person’s life. | |

readers should get in the habit of questioning the truth of what they read. | |

critical reading requires thoughtful and careful attention |

Question 7 Explanation:

Option-A FALSE: The author never says that reading is dull.

Option-B,C FALSE: Not related to given paragraph.

Option-D TRUE: The author stresses the need to read critically by performing thoughtful and careful operations on the text.

Option-B,C FALSE: Not related to given paragraph.

Option-D TRUE: The author stresses the need to read critically by performing thoughtful and careful operations on the text.

Question 8 |

Find the missing term:

60, 40, 55, 45, 50, 50,?

60, 40, 55, 45, 50, 50,?

45 | |

50 | |

55 | |

60 |

Question 8 Explanation:

Question 9 |

Find the missing alphabet:

T, r, O, m, J,?

T, r, O, m, J,?

h | |

i | |

I | |

g |

Question 9 Explanation:

In between r and T there is letter is s

Likewise m and O letter is n

Same h is the next letter to fit in that sequence

Likewise m and O letter is n

Same h is the next letter to fit in that sequence

Question 10 |

Here are some words translated from an artificial language.

Qmelaqali means fruitcake

Qalitiimmeo means cakewalk

Useguamao means buttercup

Which word could mean “cupcake”?

Qmelaqali means fruitcake

Qalitiimmeo means cakewalk

Useguamao means buttercup

Which word could mean “cupcake”?

qalitiiqali | |

amaotiimmeo | |

pakitreft | |

amaoqali |

Question 10 Explanation:

Qmelaqali→ fruitcake

We can divide artificial language into parts.

Qmela→ fruit

qali→ cake

Qalitiimmeo→ cakewalk

We can divide artificial language into parts.

Qali→ cake

tiimmeo→ walk

Useguamao → buttercup

We can divide artificial language into parts.

Usegu→ butter

amao→ cup

cupcake→ ?

amao→ cup

qali→ cake

So, option-D is correct answer.

We can divide artificial language into parts.

Qmela→ fruit

qali→ cake

Qalitiimmeo→ cakewalk

We can divide artificial language into parts.

Qali→ cake

tiimmeo→ walk

Useguamao → buttercup

We can divide artificial language into parts.

Usegu→ butter

amao→ cup

cupcake→ ?

amao→ cup

qali→ cake

So, option-D is correct answer.

Question 11 |

A man walks 5 Km towards south and then turns to the right. After walking 3 Km he turns to the left and walks 5 Km. Now in which direction is he from the starting place?

West | |

South | |

North-East | |

South- West |

Question 11 Explanation:

Question 12 |

If the consonants in the word ‘DROVE’ are first arranged alphabetically and the vowels are put in between two pairs of consonants in the alphabetical order, which of the following will be the fourth from the right end after the rearrangement?

D | |

E | |

R | |

O |

Question 12 Explanation:

In the word DROVE we have two vowels

Those are O and E

After consonants are arranged in alphabetically we got the word like DRV

But we have two place vowels in between two pairs of consonants we got finally DEROV

So right from fourth letter is E

Those are O and E

After consonants are arranged in alphabetically we got the word like DRV

But we have two place vowels in between two pairs of consonants we got finally DEROV

So right from fourth letter is E

Question 13 |

There is a queue in a ticketing office. Amanda is 10 th from the front while Murthy is 25 th from behind and Marta is just in the middle of the two. If there be 50 persons in the queue. What position does Marta occupy from the front?

16 | |

18 | |

15 | |

17 |

Question 13 Explanation:

Question 14 |

There are five janitors. Pali, Qureshi, Rohan, Sant and Timber. They all have a different height, Qureshi is shorter than only Timber and Sant is shorter than Pali and Qureshi. Who among them is the shortest?

Rohan | |

Sant | |

Pali | |

Data inadequate |

Question 14 Explanation:

From that question we can decide Pali Quereshi sant and timber but Rohan is not mentioned there. So Data inadequate is answer.

Question 15 |

A $ B means A is the father of B; A # B means A is the sister of B; A * B means A is the daughter of B and A @ B means A is the brother of B. Which of the following indicates that M is the wife of Q?

Q $ R # T @ M | |

Q $ R @ T # M | |

Q $ R * T # M | |

Q $ R @ T * M |

Question 15 Explanation:

Q $ R means R’s father is Q

R @ T means T’s brother is R

T * M means M’s Daughter T

Finally M’s Daughter is T and T’s Brother is R and R’s father is Q so Q’s wife is M.

R @ T means T’s brother is R

T * M means M’s Daughter T

Finally M’s Daughter is T and T’s Brother is R and R’s father is Q so Q’s wife is M.