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RRB JE CBT 1 - Full Test 10 - Question 1

There are five friends F, G, K, O, and P, who got different grades A, B, C, D, E in an examination, where A grade means lowest and E means highest grades. F neither got the highest nor lowest grade. A number of peoples having a higher grade than K and the number of peoples having a lower grade than K are equal. O gets the lowest grade among them. G does not get the highest grade but his grade is better than K.

Who got grade B?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 1

According to the question,

1) O gets the lowest grade among them.

2) Number of peoples having higher grade than K and number of peoples having lower grade than K are equal.

3) G does not get highest grade but his grade is better than K.

4) F neither got highest nor lowest grade.

Which means, F got grade B, and P got grade E.

Thus F got grade B.

RRB JE CBT 1 - Full Test 10 - Question 2

What was the theme of the Challachitram National Film Festival which was held in March 2019?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 2

- Challachitram National Film Festival was held in March with a special award for entries from the northeastern region.
- The theme of the festival was 'Our Heritage, Our Pride'.
- Entries for animation films, short films, and documentaries had been invited for both the competitive and non-competitive sections.

RRB JE CBT 1 - Full Test 10 - Question 3

In the following question, select the related letters from the given alternatives.

Work : Joule :: Inductance : ?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 3

SI unit of Work is Joule.

Similarly SI unit of Inductance is Henry.

Thus Inductance is related to Henry.

RRB JE CBT 1 - Full Test 10 - Question 4

Three numbers are in A.P. Such that their sum is 18 and the sum of their squares is 158. The greatest number among them is:

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 4

For an odd number of terms of an AP always take the middle term as a and other terms on either side with a common difference d.

Let the three numbers in A.P. be

(a – d), a & (a + d)

Given (a – d) + a + (a + d) = 18 or 3a = 18

∴ a = 6 …(i)

Further (a – d)^{2} + a^{2} + (a + d)^{2} = 158

⇒ 3a^{2} + 2d^{2} = 158

⇒ 2d^{2} = 158 – 3 × 36

⇒ d^{2} = 25 or d = ± 5

Then, the numbers are 1, 6, 11.

Thus, the greatest number is 11.

RRB JE CBT 1 - Full Test 10 - Question 5

Conservation of species in their natural habitats is known as ________.

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 5

- The conservation of species in their natural habitats is known as In situ conservation. It is considered the most appropriate way to conserve biodiversity.
- The conservation of components of biodiversity outside their natural habitats is known as Ex situ conservation.

RRB JE CBT 1 - Full Test 10 - Question 6

In the following question, a matrix of certain numbers is given. These numbers follow a certain trend, row wise or column wise. Find out this trend and choose the missing character accordingly.

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 6

Talking about the 1^{st} row, 5^{th} column element is obtained by multiplying 1^{st} column by 3^{rd} column then adding by 4^{th} column and then subtracting it by 2^{nd} column.

18 × 3 + 1 – 5 = 54 + 1 – 5 → 50

Similarly for 3^{rd} row

20 × 4 + 5 – 30 = 80 + 5 – 30 → 55

So for 2^{nd} row,

12 × ? + 2 – 50 = 24

12 × ? = 72

? = 72/12

= 6

Hence, “6” is the correct answer.

RRB JE CBT 1 - Full Test 10 - Question 7

Why do two ice blocks join to form one block when pressed together?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 7

When two ice cubes are pressed together, the surface pressure temporarily decreases the melting point of the top layer of ice. This top layer melts and as soon as the pressure is released, the molten ice (water) freezes back into ice due to the low temperature of surrounding molecules and this effectively forms a kind of water weld between the ice cubes.

RRB JE CBT 1 - Full Test 10 - Question 8

Mr. X went to a mall along with his friend. Pointing towards a car in the parking, he said to his friend, “This car belongs to my maternal grandmother’s son-in-law’s only siblings. My maternal grandmother have two daughters” How is car owner’s brother related to Mr. X?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 8

According to the question,

Case-1

Case-2

Hence from the above arrangements, car owner’s brother is either father or uncle of Mr. X.

RRB JE CBT 1 - Full Test 10 - Question 9

Which instrument measures AF(Audio Frequency) signal level and noise?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 9

The Psophometer measures AF(Audio Frequency) signal level and noise.

RRB JE CBT 1 - Full Test 10 - Question 10

Study the following information carefully and answer the given question.

In a certain code language,

“China has appropriated the US” is coded as “sdf pft erw ofr xcs”

“Between the US and China” is coded as “ofr pyu qmx sdf xcs”

“China has copied and improved” is coded as “erw ofr pyu oue ker”

Q. What will be the code for Appropriated?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 10

The given information can be represented as,

Hence, the word ‘appropriated’ is coded as ‘pft’.

RRB JE CBT 1 - Full Test 10 - Question 11

A beaker contains acid and water in the ratio 1 ∶ x. When 300 ml of the previous mixture and 50 ml of water are mixed, the ratio of acid and water becomes 2 ∶ 5. What is the value of x?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 11

Quantity of water in 300 ml of mixture = [x/(x + 1)] × 300

When 50 ml of water is mixed in the mixture, ratio of acid and water becomes 2 ∶ 5

⇒ Quantity of water in in the new mixture = 5/7 × (300 + 50)

⇒ (x/x + 1) × 300 + 50 = 5/7 × (300 + 50)

⇒ (x/x + 1) × 300 = 200

⇒ (x/x + 1) = 2/3

∴ x = 2

RRB JE CBT 1 - Full Test 10 - Question 12

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.

1171, 1292, ?, 1473, ?, 1586, ?, 1647, 1663

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 12

The pattern followed here is as follows,

1171 + (11)^{2} = 1171 + 121 = 1292;

**1292 + (10) ^{2} = 1292 + 100 = 1392;**

1392 + (9)^{2} = 1392 + 81 = 1473;

**1473 + (8) ^{2} = 1473 + 64 = 1537;**

1537 + (7)^{2} = 1537 + 49 = 1586;

**1586 + (6) ^{2} = 1586 + 36 = 1622**

1622 + (5)^{2} = 1622 + 25 = 1647;

1647 + (4)^{2} = 1647 + 16 = 1663

Thus the missing numbers are 1392, 1537, 1622.

RRB JE CBT 1 - Full Test 10 - Question 13

Fine solid particles or liquid droplets suspended in air are called ______.

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 13

- The aerosol is the suspension of particles in the air & atmosphere.
- They have both human-made and natural sources.
- Aerosol particles form during combustion or other industrial processes in factories and car engines, from burning biomass (such as trees and brush) to clear land for agriculture, and even in cooking fires.

RRB JE CBT 1 - Full Test 10 - Question 14

Nature of bond present in the molecule of Nitrogen gas will be

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 14

Covalent bonds are formed by atoms sharing electrons to form bonds that hold the atoms together in a molecule. This type of bond usually formed between two non–metallic elements. Nitrogen, being a non-metal, has 5 electrons is its outer shell. So to make the atom count 8 in order to get stabilized, 2 nitrogen atom would share 3 atoms each with each another, thus forming 3 pairs. These bonds which are then formed are known triple covalent bond.

RRB JE CBT 1 - Full Test 10 - Question 15

A number, when divided by 16, leaves a remainder 4. When the square of the number is divided by 16, what will be the remainder?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 15

Let the number be = 16k + 4 (where k is positive integer.)

Square of the number = (16k + 4)^{2} = 256k^{2} + 16 + 128k

Now, we have to find the remainder when the above number is divided by 16.

We will see the reminder of each term when it is divided by 4.

Since 256k^{2} and 128k will give the remainder 0 and 16 will give the remainder 0 when divided by 4.

So the required remainder = 0 + 0 + 0 = 0

RRB JE CBT 1 - Full Test 10 - Question 16

Determine the largest 4-digit number which is a perfect square.

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 16

As,

100 × 100 = 10000

So, the square of any three-digit number is of 5 digit or more

⇒ 99 × 99 = 9801

So, 9801 is the largest 4-digit perfect square

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 17

Here the vertical arrows changes direction in every next step, whereas the inclined lines forms mirror image in each step. The bidirectional arrow rotates 90 degree in clockwise direction in each step.

Hence, the above image will be the next image of the given series.

RRB JE CBT 1 - Full Test 10 - Question 18

If the side of a cube increases by 10%, then what is the percentage increase in the volume of the cube?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 18

Let, side of cube at first = x

∴ Volume of the cube at first = x^{3}

∴ side of the cube now = x + x × 10/100 = 1.1x

∴ Volume of the cube now = (1.1x)^{3} = 1.1331x

∴ percentage increase in the volume of the cube,

⇒ 0.331 × 100%

⇒ 33.1%

RRB JE CBT 1 - Full Test 10 - Question 19

Central Institute for Cotton Research(CICR) is headquartered in _________.

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 19

CICR is headquartered in Nagpur, Maharashtra. It was established in April 1976. On March 15 scientists from the organisation has developed what is reported to be the shortest-duration cotton variety in the world. Requiring only 100-120 days for maturity, the new variety could emerge as the solution to the problems of dryland cotton farmers in regions like Vidarbha and Telangana.

RRB JE CBT 1 - Full Test 10 - Question 20

An equal sum is invested in two different schemes. One scheme gives simple interest and the other gives compound interest. The sum of interest obtained after 2 years from both the schemes is Rs. 5369. If both schemes have 13% per annum interest rate, then what is the total sum?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 20

Net percentage of SI in 2 years = 13 + 13 = 26%

Net percentage of CI in 2 years = 13 + 13 + (13 × 13)/100 = 27.69%

According to question

CI + SI = 26 + 27.69 = 53.69

⇒ 53.69 unit = Rs. 5369

⇒ 100 unit = 5369/53.69 × 100 = Rs. 10,000

∵ An equal sum is invested in two different schemes

⇒ Total sum = 2 × 10,000 = Rs. 20,000

RRB JE CBT 1 - Full Test 10 - Question 21

What is the least common multiple of (7/5) and (9/25)?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 21

LCM of fractions = LCM of numerators/HCF of denominators

LCM of Numerators = LCM of 7 and 9 = 63

HCF of Denominators = HCF of 5 and 25 = 5

∴ LCM of (7/5) and (9/25) = 63/5

RRB JE CBT 1 - Full Test 10 - Question 22

Who was awarded the ‘Oscat’ by People for the Ethical Treatment of Animals (PETA) in February 2019?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 22

- Bradley Cooper was awarded the ‘Oscat’ by People for the Ethical Treatment of Animals (PETA).
- The animal rights organisation awarded the best director award to Cooper for his enlightened decision to cast his own canine companion in ‘A Star Is Born’.
- PETA is an American animal rights organisation based in Norfolk, Virginia, and led by Ingrid Newkirk, its international president.

RRB JE CBT 1 - Full Test 10 - Question 23

If x + y + z = 6 and xy + zx + zy = 10, then find the value of x^{3} + y^{3} + z^{3} – 3xyz.

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 23

We know that,

(x + y + z)^{2} = x^{2} + y^{2} + z^{2} + 2(xy + yz + zx)

Now, substituting the value we have,

⇒ 6^{2} = x^{2} + y^{2} + z^{2} + 2(10)

⇒ 36 = x^{2} + y^{2} + z^{2} + 20

⇒ x^{2} + y^{2} + z^{2} = 16

We know that,

a^{3} + b^{3} + c^{3} = (a + b + c)(a^{2} + b^{2} + c^{2} – ab – bc – ac) + 3abc

So,

⇒ x^{3} + y^{3} + z^{3} – 3xyz = (x + y + z){x^{2} + y^{2} + z^{2} – (xy + yz + zx)}

Now, substituting the values we have,

⇒ x^{3} + y^{3} + z^{3} – 3xyz = 6 × (16 – 10) = 6 × 6 = 36

RRB JE CBT 1 - Full Test 10 - Question 24

In the following question, two statements are given each followed by two conclusions I and II. You have to consider the statements to be true even if they seem to be at variance from commonly known facts. You have to decide which of the given conclusions, if any, follows from the given statements.

**Statement** **I:** Medicines today have become an integral part of everyone’s life.

**Statement II:** People undergo medicinal treatment at any age.

**Conclusion I:** Lifestyle has made us easy going and less caring for health.

**Conclusion II:** Medicines have become a compulsory part of one’s life

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 24

**Statement I:** Medicines today have become an integral part of everyone’s life.

**Statement II**. People undergo medicinal treatment at any age.

**Conclusion I:**

Lifestyle has made us easy going and less caring for health → It does not follow from any of the given statements.

**Conclusion II:**

Medicines have become a compulsory part of one’s life → 'Integral' does not mean 'compulsory', hence conclusion 2 does not follow.

Hence neither of the conclusions follow.

RRB JE CBT 1 - Full Test 10 - Question 25

In the following question, select the related letters from the given alternatives.

JFTNC : OAYIH :: LSHVM : ?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 25

In JFTNC : OAYIH,

Similarly for LSHVM,

Thus LSHVM is related to QNMQR.

RRB JE CBT 1 - Full Test 10 - Question 26

Which one of the following is not a major component of biotic environment?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 26

Biotic components comprise of living things that contribute in the formation of an ecosystem. These include animals, humans, plants, microorganisms etc.

Abiotic components include non-living parts of the ecosystem such as light, water, air, soil etc.

RRB JE CBT 1 - Full Test 10 - Question 27

**Directions:** In the question a statement is given, followed by two arguments, I and II. You have to consider the statement to be true even if it seems to be at variance from commonly known facts. You have to decide which of the given arguments, if any, is a strong argument.

**Statement:** Should street lights be switched off after midnight?

**Argument I:** No, statistics show that crime and accidents will increase if the street lights are switched off.

**Argument II: **Yes, since fewer vehicles ply after midnight, expensive electricity will be wasted.

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 27

The correct answer is option 1. Only argument I is strong.

The first argument states that if lights are switched off after midnight, then it can result in increased crime and accidents, thus it is a strong argument as it has a direct impact on life of people.

Argument II, in comparison with argument I, is weaker as there are other ways to save electricity, such as switching to more efficient sources, managing the usage of electricity, etc. Switching off streetlights after midnight will increase the risk to human lives which cannot be allowed. Thus, argument II is not strong.

RRB JE CBT 1 - Full Test 10 - Question 28

In the following question, select the odd numbers from the given alternatives.

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 28

3709, 5147, and 2671 all are prime numbers whereas 3171 is not.

Thus 3171 is the odd number.

RRB JE CBT 1 - Full Test 10 - Question 29

Avogadro’s Law shows a relationship between ________.

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 29

Avogadro’s Law states that at constant temperature and pressure, all equal volume of gases will have an equal number of molecules" which means 'V' is directly proportional to the 'Number of molecules'.

RRB JE CBT 1 - Full Test 10 - Question 30

In the following question, by using which mathematical operators will the expression become correct?

130 _ 15 _ 20 _ 10_ 2 = 45

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 30

Following the BODMAS rule,

1) ×, ÷, +, - → 130 × 15 ÷ 20 + 10 - 2 = 105.5 ≠ 45

2) ÷, ×, +, - → 130 ÷ 15 × 20 + 10 - 2 = 181.33 ≠ 45

3) **+, -, ×, ÷ → 130 + 15 - 20 × 10 ÷ 2 = 45**

4) -, ÷, ×, + → 130 - 15 ÷ 20 × 10 + 2 = 124.5 ≠ 45

Hence, “+, -, ×, ÷” is the correct answer.

RRB JE CBT 1 - Full Test 10 - Question 31

The elements in the middle of the periodic table are called ________.

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 31

- In the periodic table of elements, there are seven horizontal rows of elements called periods. The vertical columns of elements are called groups, or families.
- The transition metalsmake up the middle block of the periodic table.
- The
**transition elements****or transition metals**occupy the short columns in the center of the periodic table, between Group 2A and Group 3A. They are sometimes called the*d*-block elements, since in this region the*d*-orbitals are being filled in, and are also referred to as B-group elements since in most numbering systems of the columns on the periodic table the numerals of these groups are followed by the letter B.

RRB JE CBT 1 - Full Test 10 - Question 32

The average of 10 numbers is 20 and that of the other 30 numbers is 40. What is the average of all the numbers?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 32

Given,

The average of 10 numbers = 20

⇒ Sum of 10 numbers = 20 × 10 = 200

The average of other 30 numbers = 40

⇒ Sum of other 30 numbers = 40 × 30 = 1200

Sum of all 40 numbers = 200 + 1200 = 1400

∴ Average of all 40 numbers = 1400/40 = 35

Hence, Average of 40 numbers = 35

RRB JE CBT 1 - Full Test 10 - Question 33

Given below are certain facts about radioactivity. Identify the correct one(s).

Marie and Pierre Curie discovered radioactivity.

The term “radioactivity” was given by Henri Becquerel.

Henri Becquerel also discovered radioactive elements, radium and polonium.

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 33

**Henri Becquerel**discovered radioactivity in 1896.- The term “radioactivity” was given by
**Marie and Pierre Curie**. **Marie and Pierre Curie**discovered radioactive elements, radium and polonium.- The process by which an unstable atomic nucleus loses energy by emitting energy is termed as radioactivity.

RRB JE CBT 1 - Full Test 10 - Question 34

Which of the following acids destroys bacteria in stomach?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 34

- The acid which help us to digest food and is present in our stomach is HCL.
- Hydrochloric acid activates pepsinogen into the enzyme pepsin, which then helps digestion by breaking the bonds linking amino acids, a process known as proteolysis.
- Gastric acid, gastric juice or stomach acid, is a digestive fluid formed in the stomach and is composed of hydrochloric acid, potassium chloride and sodium chloride

RRB JE CBT 1 - Full Test 10 - Question 35

From the given alternative words select the word which cannot be formed using the given letter of the given word.

PRONUNCIATION

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 35

1) Opinion → **P**R**ON**UNC**I**AT**ION**

2) Cartoon → P**RO**NUN**C**I**AT**I**ON**

3) Curtain → P**R**ON**U**N**CIAT**IO**N**

4) Curator → cannot be formed as there is single R in the word PRONUNCIATION.

Thus word ‘Curator’ cannot be formed from the word PRONUNCIATION.

RRB JE CBT 1 - Full Test 10 - Question 36

What will come in place of question mark ‘?’ in the following question?

2112 + 692 × 2 – 1111 × 5 + 7324 × 8 = ?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 36

Follow BODMAS rules to solve the equation

Step -1: The part of the equation containing 'Brackets' must be solved first, and in the bracket,

Step -2: Any mathematical 'Of' or 'Exponent' must be solved next,

Step -3: Next, the parts of the equation that contain 'Division' and 'Multiplication' are solved

Step -4: At last, the part of the equation that contains 'Addition' and 'Subtraction' should be solved.

⇒ 2112 + 692 × 2 – 1111 × 5 + 7324 × 8 = ?

⇒ 2112 + 1384 – 5555 + 58592 = ?

⇒ ? = 62088 – 5555 = 56533

∴ ? = 56533.

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 37

Given,

x + 4/x = 4

⇒ x^{2} + 4 = 4x

⇒ x^{2} - 4x + 4 = 0

⇒ (x - 2)^{2} = 0

⇒ x = 2

∴ (x^{6} + 1) = 2^{6} + 1 = 64 + 1 = 65

RRB JE CBT 1 - Full Test 10 - Question 38

A car completed a journey of 4200 km. First 2000 km at 50 km/hr then next 1200 km at 60 km/hr and rest at 100 km/hr. Calculate the average speed of the journey.

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 38

∵ Time = Distance/Speed

Total time = T_{1} + T_{2} + T_{3}

⇒ Total time = 2000/50 + 1200/60 + 1000/100

⇒ Total time = 40 + 20 + 10 = 70 hrs

Average speed = (Total Distance)/(Total time)

∴ Average speed = 4200/70 = 60 km/hr

RRB JE CBT 1 - Full Test 10 - Question 39

Indravati, Pranhita and Sabari are important tributaries of which of these rivers?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 39

Godavari is the second longest river in India. It originates from the Brahmagiri Mountain located in Maharashtra.

It’s major tributaries are divided into left bank tributaries and right bank tributaries. Pranhita, Indravati and Sabari are the major left bank tributaries of Godavri.

RRB JE CBT 1 - Full Test 10 - Question 40

Who among the following administers the oath of office to the Speaker of the Lok Sabha?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 40

- There is no oath of office to be administered to the Speaker of the Lok Sabha.
- The Speaker submits his or her resignation to the Deputy Speaker of the Lok Sabha.
- The Chief Justice is responsible for administering the oath of office to the President whereas he submits his resignation to the Vice President.
- The President administers the oath of office to the Prime Minister and he submits his resignation also to the President.
- The President administers the oath of office to the Vice President and also accepts his or her resignation if required.

RRB JE CBT 1 - Full Test 10 - Question 41

Which of the following alloy is used for making magnets for hearing aids?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 41

Alnico is from a family of iron alloys which in addition to iron are composed primarily of aluminium, nickel, and cobalt. They also include copper, and sometimes titanium. They are used for making magnets for hearing aids.

RRB JE CBT 1 - Full Test 10 - Question 42

Rishu travels at 40 km/hr, he reaches his destination late by 10 minutes but if he travels at 60 km/h then he reaches 10 minutes earlier. The distance travelled by him is:

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 42

⇒ Let the distance to office be x km

⇒ Time taken if he rides at 40 km/hr = (x/40) hr

⇒ Time taken if he rides at 60 km/hr = (x/60) hr

⇒ difference of time = 10 min + 10 min = 20 min = 1/3 hr

⇒ (x/40) − (x/60) = 1/3

⇒ (3x - 2x)/120 = 1/3

⇒ 3x = 120

∴ x = 40 km

RRB JE CBT 1 - Full Test 10 - Question 43

Where in the human body would you find a bony piece called “Stapes”?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 43

**Stapes**is found in**Ears**.- It is one of the three ear ossicles present in human body. The three ossicles are Malleus, Incus and Stapes.
- Stapes is shaped like a stirrup and is the smallest bone in the Human body.

RRB JE CBT 1 - Full Test 10 - Question 44

If 50 less had applied and 25 less selected, the ratio of selected to unselected would have been 9 : 4. How many candidates had applied, if the ratio of selected to unselected was 2 : 1?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 44

Since the ratio of selected to unselected was 2 : 1;

Selected candidates = 2x, Unselected candidates = x and total applied candidates = 3x

If 50 less had applied and 25 less selected, the ratio of selected to unselected would have been 9 : 4

∴ Total applied candidates = (3x – 50)

And Selected candidates = (2x – 25) and Unselected candidates = x – 50 + 25

∴ (2x – 25) / (x – 25) = 9/4

⇒ x = 125

∴ Total number of candidates who applied = 3x = 375

RRB JE CBT 1 - Full Test 10 - Question 45

**Direction**: In making decisions about important question, it is desirable to be able to distinguish between strong and weak arguments. Strong arguments are those, which are both important and directly related to the question. Weak arguments are those, which are of minor importance and also may not be directly related to the question or may be related to a trivial aspect of the question. The question below is followed by two arguments numbered I and II. You have to decide which of the arguments a Strong argument is and which a weak argument is.

**Statement:**

Should NDMC introduce e-scooters sharing system?

**Arguments:**

I. Yes. E-scooters will help in improving air quality and decrease pollution.

II. No. Introducing new e- vehicles on road will lead to traffic congestion.

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 45

Since e-scooters run on batteries, so there are no fumes or burning of fuels in the engine. Thus, these are eco-friendly. Therefore, argument I is strong.

Argument II is a weak argument as sharing system will help in reducing the number of vehicles on road and also the e-scooters have leaner volume which means they can reduce the traffic congestion instead of increasing it.

Hence, only argument I is strong.

RRB JE CBT 1 - Full Test 10 - Question 46

Study the following information carefully to answer the given question.

If 'A + B' means 'B is the son of A'

If 'A × B' means 'A is the mother of B'

If 'A % B' means 'A is the sister of B'

If 'A ÷ B' means 'B is the father of A'If 'A $ B' means 'B is the wife of A'

Which of the following option is true if the expression D + Z $ P × N % O $ T is definitely true?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 46

According to the question, D + Z $ P × N % O $ T , can be decoded as, Z is son of D, P is wife of Z, P is mother of N, N is sister of O, T is wife of O.

Let’s check each option,

1) D is grandfather of N → False since gender of D is not defined.

2) Z is mother of N → False as Z is father of N.

3) O is granddaughter of D → False as O is grandson of D.

Hence, “none of the above” is the answer.

RRB JE CBT 1 - Full Test 10 - Question 47

A bifocal lens is used as a remedy in which of the following defects in the eyes?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 47

RRB JE CBT 1 - Full Test 10 - Question 48

Which meristem increases the length of the stems and the roots?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 48

- Apical Meristem increases the length of the roots and stem as it produces auxin which is a plant hormone.
- It can be found at the tips of the shoot and root of a plant.

RRB JE CBT 1 - Full Test 10 - Question 49

What will come in place of question mark ‘?’ in the following question?

0.001 × 11 – 0.1 ÷ 100 + 0.01 × 0.11 × 1.1 = ?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 49

⇒ 0.001 × 11 – 0.1 ÷ 100 + 0.01 × 0.11 × 1.1 = ?

Follow these BODMAS rules to solve the question

Step-1: The part of the equation containing 'Brackets' must be solved first, and in the bracket,

Step-2: Any mathematical 'Of' or 'Exponent' must be solved next,

Step-3: Next, the parts of the equation that contain 'Division' and 'Multiplication' are solved

Step-4: At last, the part of the equation that contains 'Addition' and 'Subtraction' should be solved.

⇒ 0.011 – 0.001 + 0.00121 = ?

⇒ 0.01 + 0.00121 = ?

∴ ? = 0.01121

RRB JE CBT 1 - Full Test 10 - Question 50

Study the following information carefully and answer the questions that follow.

5 persons Anil, Bhagat, Ishan, Deepak, and Parmish use 5 different apps namely, Whats-App, Instagram, Twitter, Facebook, and LinkedIn. They all wear different brands of shoes namely, Adidas, Reebok, Nike, Puma, and Vans. The person who wears Puma shoes does not use Facebook. Parmish wears Nike shoes and uses the LinkedIn app. Anil who wear Adidas shoes but neither uses Facebook nor Twitter. Ishan neither wear Vans nor Puma shoes but he uses the Twitter app. The person who uses Whats-App doesn’t wear Adidas shoes. Bhagat uses the Facebook app.

Q. Deepak wear which shoes brand, and also determines who uses Instagram?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 50

According to the question,

1) Parmish wear Nike shoes and uses the LinkedIn app.

2) Anil who wear Adidas shoes but neither uses Facebook nor Twitter.

3) Bhagat uses the Facebook app.

4) Ishan neither wears Vans nor Puma shoes but he uses the Twitter app.

Thus he must be wearing Reebok shoes.

5) The person who uses Whats-App doesn’t wear Adidas shoes.

Thus Anil must be using Instagram.

6) The person who wears Puma shoes does not use Facebook.

Hence, Deepak wears Puma shoes and Bhagat wears Vans shoes.

Thus Deepak wears Puma shoes and Anil uses Instagram

RRB JE CBT 1 - Full Test 10 - Question 51

A shopkeeper sold big, medium and small sized bulbs for Rs. 150, Rs. 80 and Rs. 50 respectively. The total number of bulbs sold were in the ratio of 2 ∶ 7 ∶ 11. What is the average price paid for a bulb?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 51

Let the total number of bulbs be 2x, 7x and 11x.

Then,

Total price of Big bulbs = 150 × 2x = 300x

Total price of Medium bulbs = 80 × 7x = 560x

Total price of Small bulbs = 50 × 11x = 550x

Average cost of bulbs = (300x + 560x + 550x)/20x = 1410/20 = 70.5

RRB JE CBT 1 - Full Test 10 - Question 52

A man undertakes to do a work in 150 days. He employs 200 men. He finds that only a quarter of the work is done in 50 days. How many additional men should he employ so that the whole work is finished in time?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 52

200 men can complete the quarter of work in 50 days

If they continue the work, time is taken to complete the remaining work = 3 × 50 = 150 days

[∵ ¾ th of the work is remaining]

But they have to complete in 100 days to finish in time

Time ∝ 1/Number of employees

Let the number of extra employees required to complete the work in time be x

∴ 150/100 = (200 + x)/200

300 = 200 + x

∴ x = 100

RRB JE CBT 1 - Full Test 10 - Question 53

If one root of the equation Ax2 + Bx + C = 0 is two and a half times the other, then which of the following is TRUE?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 53

Ax^{2} + Bx + C = 0

Let one root be P and then the other root will be 2.5P

⇒ P + 2.5P = -B/A (Sum of Roots)

⇒ 3.5P = -B/A ---- (1)

⇒ P × 2.5P = C/A (Product of Roots)

⇒ 2.5 P^{2} = C/A ---- (2)

From equation 1 and 2

⇒ 2.5 × B^{2}/ (3.5 × 3.5 × A^{2}) = C/A

⇒ B^{2} = 4.9AC

∴ 10B^{2} = 49AC

RRB JE CBT 1 - Full Test 10 - Question 54

The price of the LED strap is directly proportional to square to its length. Shopkeepers cut the LED strip in the ratio of 5 ∶ 4 ∶ 3 and this leads to a loss of Rs 1880. What is the initial price of the LED strap?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 54

Let initial length of the LED strap = (5 + 4 + 3) = 12 unit

So, initial price of the LED strap = 12^{2} = 144

Price, after cutting the LED strap = 5^{2} + 4^{2} + 3^{2} = 25 + 16 + 9 = 50

⇒ (144 - 50) unit = 1880

⇒ 94 unit = 1880

⇒ 1 unit = 20

So, initial price of the LED strap = 144 × 20 = Rs 2,880

RRB JE CBT 1 - Full Test 10 - Question 55

Select a suitable figure from the answer figures that would replace the question mark (?)

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 55

As the plant is developed from seeds,

Similarly,

Flower also develops from a bud.

Hence, option 3 is the correct answer.

RRB JE CBT 1 - Full Test 10 - Question 56

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.

Bharatnatyam, Kathak, Kathakali, Manipuri, Mohiniyattam, Kuchipudi,?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 56

Given series refers to the classical dance forms of India.

Sattriya is also a classical dance form of Assam.

Thus Sattriya, is the next term in the series.

RRB JE CBT 1 - Full Test 10 - Question 57

An engineer got an increment of 20% on his salary. Before the increment, he used to donate 2% of his salary. After his increment, he continued to donate 2% of his salary. If his monthly donation was increased by Rs. 500, find his new monthly salary.

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 57

Let his initial monthly salary be Rs. ‘x’

New monthly salary = (100 + 20)% of x = 1.2x

Initial monthly donation = 2% of x = 0.02x

New monthly donation = 2% of 1.2x = 0.024x

Now, increase in monthly donation = Rs. 500

⇒ 0.024x – 0.02x = 500

⇒ x = 500/0.004 = 125000

∴ His new monthly salary = 1.2x = 1.2 × 125000 = Rs. 150000

RRB JE CBT 1 - Full Test 10 - Question 58

Which state launched the 'Yuva Swabhiman Yojana' on 26 January 2019?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 58

- The government of Madhya Pradesh launched the 'Yuva Swabhiman Yojana' on 26 January 2019.
- It aims to provide employment to the youth belonging to the weaker section of the society mainly in urban areas of the state.
- Under this scheme, 100 days of employment will be provided to youngsters from economically weaker sections of the society in urban areas.

RRB JE CBT 1 - Full Test 10 - Question 59

Which of the following statements is not correct about Lichens?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 59

- Statement 3 is not correct.
- The Lichens are famous as they do not need a regular supply of water.
- Their metabolism can go into suspension and later revive.
- They can occur anywhere on land and under water.

RRB JE CBT 1 - Full Test 10 - Question 60

Who was the Nawab of Bengal during the battle of Plassey?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 60

- Battle of Plassey was fought between Nawab of Bengal and Robert Clive.
- The battle took place on 23 June 1757.
- At that time the Nawab of Bengal was Siraj ud daulah.
- Robert clive bribed Mir Jafar, who was the chief of the Nawab's army.

RRB JE CBT 1 - Full Test 10 - Question 61

In plants, water is transported through which of the following medium?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 61

Xylem tissues are responsible for transportation of water in plants.

- Phloem tissues are responsible for transportation of food in plants.

Hence, option 1 is correct.

RRB JE CBT 1 - Full Test 10 - Question 62

Which among the following Indus Valley Civilization sites is/are NOT situated in India?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 62

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 63

Inderkilla National Park is in Himachal Pradesh. Following national parks of Himachal Pradesh are

**Trick : Simba ne Great Himalaya ke Valley me Inder ke Saath Khir Khai**

RRB JE CBT 1 - Full Test 10 - Question 64

If the compound interest received on a certain amount in the 2nd year is Rs. 250. What will be the compound interest (in Rs.) for the 3rd year on the same amount at 12% rate of interest?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 64

CI of the 2^{nd} year = Rs. 250

⇒ CI of the 3^{rd} year will be = [CI of 2^{nd} year] + [12% interest on CI of 2^{nd} year].

∴ CI of 3^{rd} year = 250 + 250 × 0.12 = Rs. 280

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 65

Given that,

12x – 7y = 5x + 3y

⇒ 7x = 10y

⇒ x/y = 10/7

Squaring both the side, we get

x^{2}/y^{2} = 100/49

By the rule of componendo and dividendo

RRB JE CBT 1 - Full Test 10 - Question 66

Find out which of the figures can be formed by using all the pieces given in the figure.

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 66

The seven figures are arranged in a particular order to form image at option 3.

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 67

Here in each square the outer figure are rotating in an anti-clockwise direction, whereas in the inner part of the figure is rotates 90 degrees in the clockwise direction.

Hence, the above image will be the next image of the given series.

RRB JE CBT 1 - Full Test 10 - Question 68

When is the World Refugee Day is celebrated across the world?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 68

The world refugee day is celebrated on 20^{th} June every year. It is celebrated to commemorate the strength, courage, and perseverance of millions of refugees. The day was established by the General Assembly of United Nations for the refugees to honour them for their courage of facing lots of problems after losing homes due to conflict or violence and their contributions to their communities.

RRB JE CBT 1 - Full Test 10 - Question 69

What is the simplified form of 4^{12} × 16^{35} × 64^{15}?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 69

⇒ 4^{12} × 16^{35} × 64^{15}

⇒ 4^{12} × (4^{2})^{35} × (4^{3})^{15}

⇒ 4^{12} × 4^{70} × 4^{45}

⇒ 4^{12 + 70 + 45}

⇒ 4^{127}

RRB JE CBT 1 - Full Test 10 - Question 70

Which of the following diseases is caused by bacteria?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 70

RRB JE CBT 1 - Full Test 10 - Question 71

P and Q are two points observed from the top of a building 10√3 m high. If the angles of depression of the points are complementary and PQ = 20 m, then the distance of P from the building is (Given that distance of P from the building is more than the distance of q)

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 71

Let OR = 10√3 m.

The angles of depression of the points are complementary and PQ = 20 m.

⇒ ∠OQR + ∠OPR = 90°

Let ∠OQR = x and ∠OPR = y

⇒ x + y = 90°

And let RQ = l m.

⇒ tan x = 10√3/l …….. eq(1)

⇒ tan y = 10√3/(l + 20)

⇒ tan (90 – x) = 10√3/(l + 20)

⇒ cot x = 10√3/(l + 20)

We know that tan θ . cot θ = 1.

⇒ 100 × 3 = l (l + 20)

⇒ 10 (10 + 20) = l (l + 20)

⇒ l = 10 m.

∴ The distance of P from the building = 10 + 20 = 30 m.

RRB JE CBT 1 - Full Test 10 - Question 72

**Directions: **Study carefully the information given below and answer the questions that follows.

Prashant start driving from his home in east direction, after driving 30km he turns 45 degree towards right and drives for about 30 minutes having speed of 40kmph to reach his lawyer’s office. From lawyer’s office he moves in north direction for 40km to reach his office. From office he travels in west direction for about 20km then turn 60 degree towards left and drives about 25km to reach his home.

Q. If Prashant goes directly to his office, what cannot be the distance between his home and his office?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 72

The path followed by Prashant is as follows,

When Prashant drives for about 30 minutes with speed of 40kmph, that means he drives 20 km.

If he goes directly to office from his home, we will consider triangle ADE,

By applying triangle inequality property,

1) Difference of two sides < x < sum of two sides.

From the above inequality,

25 - 20 < x < 20 + 25

5 < x < 45

Hence the distance between his office and his home should be in range from 5 to 45.

From the above options, “50” cannot be the distance between his office and his home.

Hence, “50” is the correct answer.

RRB JE CBT 1 - Full Test 10 - Question 73

**Directions: **Study carefully the information given below and answer the questions that follows.

Prashant start driving from his home in east direction, after driving 30km he turns 45 degree towards right and drives for about 30 minutes having speed of 40kmph to reach his lawyer’s office. From lawyer’s office he moves in north direction for 40km to reach his office. From office he travels in west direction for about 20km then turn 60 degree towards left and drives about 25km to reach his home.

Q. If Prashant drives whole journey with same speed of 40kmph, then how much time he drives the car?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 73

The path followed by Prashant is as follows,

When Prashant drives for about 30 minutes with speed of 40kmph, which means he drives 20 km.

Total distance travelled by Prashant = 30 + 20 + 40 + 20 + 25 = 135km

Speed = 40kmph

Time = Total distance/ speed

= 135/40

= 27/8 hr.

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 74

Gobar gas or biogas typically refers to a mixture of different gases produced by the breakdown of organic matter in the absence of oxygen. It is primarily methane (CH_{4}) and carbon dioxide (CO_{2}) and may have small amounts of hydrogen sulfide (H_{2}S), moisture and siloxanes.

RRB JE CBT 1 - Full Test 10 - Question 75

A train passes a man standing on a 154 m long platform in 5s. The train takes 12s to completely pass the platform. What is length and speed of the train?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 75

Let the length of the train be x m and the speed be y m/s.

While crossing a man, train covers a distance equal to its own length.

∴ x/y = 5

⇒ x = 5y

While crossing a platform, train covers a distance equal too sum of its own length and length of platform.

∴ length of train and platform together = (x + 154) m

⇒ x + 154 = 12y

⇒ 5y + 154 = 12y (Putting the value x = 5y)

⇒ y = 154/7 = 22

∴ Length of the train = 5 × 22 = 110 m

Speed of the train = 22 m/s

RRB JE CBT 1 - Full Test 10 - Question 76

Which Aluminium salt is commonly used to stop bleeding?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 76

Aluminum salt commonly used to stop bleeding is Potash Alum. It is also known as aluminum potassium Sulphate. It is commonly used in purification of drinking water. It is naturally transpiring mineral salt.

RRB JE CBT 1 - Full Test 10 - Question 77

In the following question, select the odd numbers from the given alternatives.

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 77

1) 1243 → 1 + 2 + 4 + 3 = 10

2) 1621 → 1 + 6 + 2 + 1 = 10

3) 2061 → 2 + 0 + 6 + 1 = 9

4) 1171 → 1 + 1 + 7 + 1 = 10

Thus 2061 is the odd number.

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 78

- Milarite is an ore of Nickel. Haemetite, Siderite, Magnetite and Limonite are ores of Iron.
- Ore is a naturally occurring rock or mineral from which metals can be extracted.

RRB JE CBT 1 - Full Test 10 - Question 79

Plants which grow in salty water near sea shore are called as ______.

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 79

A halophyte is a plant that grows in salty water coming into contact with saline water through its roots or by salt spray, such as in saline semi-deserts, mangrove swamps, marshes and sloughs and seashores.

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 80

- ‘India: The Future Is Now’ is a book written by Shashi Tharoor.
- It is regarding an inspiring vision of India by the young parliamentarians of the country.

RRB JE CBT 1 - Full Test 10 - Question 81

Lysosome is formed from which of the following cell organelles?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 81

Lysosomes are formed by the fusion of Golgi network with endosomes, which contain molecules taken up by endocytosis at the plasma membrane. Lysosomes are tiny sack filled with fluid containing digestive enzymes that acts as a biological catalyst. The main function of lysosomes is to remove waste as well as destroying a cell after it has died. They are also known as garbage disposal of cells.

RRB JE CBT 1 - Full Test 10 - Question 82

Choose the correct information regarding the acids and bases as per the different theories are given below.

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 82

According to Bronsted and Lowry theory, a base is a proton acceptor.

RRB JE CBT 1 - Full Test 10 - Question 83

Recently, Manfred Eigen passed away. He received Nobel Prize in the field of ________ in 1967.

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 83

- Manfred Eigen, who was awarded a one-half share of the 1967 chemistry Nobel prize died.
- He developed techniques to determine the rates of reactions and processes and also pioneered a process called relaxation.
- He founded the Max Planck Institute for Biophysical Chemistry by merging the Max Planck Institute for Physical Chemistry in 1971.

RRB JE CBT 1 - Full Test 10 - Question 84

Two water taps together can fill a tank in hours. The tap of larger diameter takes 8 hours less than the smaller one to fill the tank separately. Find the time (in hours) in which each tap can separately fill the tank.

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 84

Let first tap alone can fill the tank in x h and second in y h

⇒ 1/x + 1/y = 8/51

Let the diameter of first pipe is greater

⇒ x = y - 8

⇒ 1/(y - 8) + 1/y = 8/51

⇒ (2y - 8) / [y(y - 8)] = 8/51

⇒ 51(2y - 8) = 8y(y – 8)

⇒ 102y - 408 = 8y^{2} - 64 y

⇒ 8y^{2} - 166y + 408 = 0

⇒ 4y^{2} - 83y + 204 = 0

Solving this equation, we get

⇒ y = 17.9, 2.8

⇒ x = 9.9, -5.2

But x can’t be negative

∴ x = 9.9 and y = 17.9

RRB JE CBT 1 - Full Test 10 - Question 85

A ball rolling along the ground gradually slows down and finally comes to rest. It is due to ________.

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 85

A rolling ball stops because the surface on which it rolls resists its motion. It happens because of friction, when the ball rolls across the floor, the floor opposes the motion of the ball which takes away from the momentum of the ball.

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 86

Checking the options by putting A = 30°;

∴ Here it is evident that option 1 is correct.

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 87

RRB JE CBT 1 - Full Test 10 - Question 88

Which of the following organs is termed as “graveyard of RBC”?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 88

**Spleen**is termed as “**graveyard of RBC**” because it removes the old RBCs (Red Blood Cells).- It is an active haemopoietic organ and in adults act as “blood bank”.
- Heart is the central pumping organ which sends blood to different body parts and then receives it.
- The interstitial fluid when gets collected in the lymphatic system is termed as lymph.
- Liver is the second largest organ in the human body and its main function is to detoxify chemicals and metabolize drugs.

RRB JE CBT 1 - Full Test 10 - Question 89

Total internal reflection will never take place if the light goes from water to glass. Which among the following will explain the reason for this phenomenon?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 89

- For total internal reflection to take place, the light should travel from denser to rarer medium.
- Since glass is denser than water, the total internal reflection will not take place if the light goes from water to glass.
- In the case of total internal reflection, the angle of incidence must also exceed the critical angle.
- Sparkling of diamond, mirage etc. are examples of total internal reflection.

RRB JE CBT 1 - Full Test 10 - Question 90

Which of the following symbols should be placed in the blank spaces respectively (in the same order from left to right) in order to complete the given expression in such a manner that “P > Q” definitely holds false?

T _ P _ M _ W _ Q

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 90

Let’s check each option,

1) T < P > M = W > Q → here P > Q hold true.

2) T ≤ P ≥ M > W ≤ Q → here no relation can be determined between P and Q.

3) T ≥ P ≥ M = W = Q → here P > Q is possible.

4) T = P ≤ M < W ≤ Q → here P > Q hold false

Hence, “=, ≤, <, ≤” is the correct answer.

RRB JE CBT 1 - Full Test 10 - Question 91

Which of the following controls the size of the pupil in the human eye?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 91

RRB JE CBT 1 - Full Test 10 - Question 92

Which of the following is necessary for a natural monopoly?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 92

- A natural monopoly is a monopoly that exists because of the cost of producing the product i.e. a good or a service is lower due to economies of scale.
- A natural monopoly occurs whenever an industry is high, and its market shared among two or more rival plants owning duplicate distribution networks.
- A natural monopoly can also appear in smaller local markets for products that are difficult to transport.

RRB JE CBT 1 - Full Test 10 - Question 93

Who formulated the classical theory of electromagnetic radiation?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 93

James Clerk Maxwell was a Scottish scientist in the field of mathematical physics. His most notable achievement was to formulate the classical theory of electromagnetic radiation, bringing together for the first time electricity, magnetism, and light as manifestations of the same phenomenon.

RRB JE CBT 1 - Full Test 10 - Question 94

Soda bottles are made of thick glass so that they can withstand the ______.

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 94

**Soda bottles**are made of**thick glass**so that they can withstand the**pressure in summer**.- Soda bottles are generally made of
**'Polyethylene Terephthalate'**, commonly known as**PET**plastic, or glass using the blow moulding process. - Usually, the plastic bottles used to hold potable water, soda and other drinks are made from PET material because that is both strong and light, so that they can withstand pressure in summer.
- *To be able to withstand internal gas pressure, the bottle is made from thick, heavy glass

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 95

SI units:

- Conductivity is the reciprocal of resistivity.
- The resistance offered by a wire of unit length and unit area of cross-section is called resistivity or specific resistance (r).
- Resistance is the ratio of applied potential difference (V) to the current (I) flowing through the conductor.
- Conductance is the reciprocal of resistance.

RRB JE CBT 1 - Full Test 10 - Question 96

**Directions:** In the question given below is given a statement followed by two conclusions. You have to assume everything in the statement to be true and decide which of the assumption logically follows beyond a reasonable doubt from the information given in the statement.

**Statement:**

An advertisement provides - “Use Surf Royal to get clean and white clothes.”

**Conclusions:**

I. People like to use surf which cleans clothes.

II. People easily get attracted to an advertisement.

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 96

Conclusion 1 says: **People like to use surf which cleans clothes**. This does not follow as there is no such information provided in the statement.

Conclusion 2 says: **People easily get attracted to an advertisement**.** **This does not follow as nowhere is it written that this advertisement might have the same effect of being popular.

Hence, none follows.

RRB JE CBT 1 - Full Test 10 - Question 97

Article 51-A of the Indian Constitution deals with which of the following matter?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 97

**Article 51-A**of the Indian Constitution deals with**Fundamental Duties**.- Articles 12-35 of the Indian Constitution deals with Fundamental Rights.
- Articles 5-11 of the Indian Constitution deals with Citizenship.
- Articles 343-351 of the Indian Constitution deals with Official language.

RRB JE CBT 1 - Full Test 10 - Question 98

A number is multiplied by (6/7) instead of (5/8). New value is what percent of desired value?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 98

Let the number be x.

When the number is multiplied by 6/7, then we get = 6x/7

And when this number is multiplied by 5/8, then we get = 5x/8

Required Percentage =

RRB JE CBT 1 - Full Test 10 - Question 99

The ratio in which a variety of U.P sugar at Rs. 25/kg is mixed with another type of Gujarat sugar costing Rs 30/kg to get a gain of 20% by selling the blended sugar at Rs. 34/kg is:

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 99

Let the amount of U.P sugar in a mixture of 1 kg be x kg

⇒ Amount of Gujarat sugar in 1 kg mixture = (1 – x) kg

⇒ Total cost price of 1 kg mixture = 25x + 30(1 – x) = 30 – 5x

Now, for 20% profit

⇒ S.P = (120/100) × C.P

⇒ 34 = 120C.P/100

But, C.P = 30 – 5x

⇒ 34 = 120(30 – 5x)/100

⇒ 17 = 3(6 – x)

⇒ 17 = 18 – 3x

⇒ 3x = 1

⇒ x = 1/3

⇒ 1 – x = 1 – 1/3 = 2/3

∴ So the desired ratio is x : (1 – x) = 1 : 2

RRB JE CBT 1 - Full Test 10 - Question 100

Which of following sectors does NOT come under tertiary sector?

Detailed Solution for RRB JE CBT 1 - Full Test 10 - Question 100

• Tertiary sector also known as service sector is one among the three type of economic sectors in a developed economy, the other two being Primary (extraction of raw materials) and secondary (manufacturing) sectors.

• Tertiary sector is concerned with the provision of services to other businesses and to final consumers too. Apart from electricity, other three options i.e. Business services, transport and trade come under tertiary sector.

• **Electricity** doesn’t fall into the category of tertiary sector because it is a joint collaboration between government with the states as they both share the funding part by creating overall economic growth.

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