RRB NTPC Mock Test - 4 (English)


100 Questions MCQ Test RRB NTPC - Mock Tests Papers 2020 | RRB NTPC Mock Test - 4 (English)


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This mock test of RRB NTPC Mock Test - 4 (English) for Railways helps you for every Railways entrance exam. This contains 100 Multiple Choice Questions for Railways RRB NTPC Mock Test - 4 (English) (mcq) to study with solutions a complete question bank. The solved questions answers in this RRB NTPC Mock Test - 4 (English) quiz give you a good mix of easy questions and tough questions. Railways students definitely take this RRB NTPC Mock Test - 4 (English) exercise for a better result in the exam. You can find other RRB NTPC Mock Test - 4 (English) extra questions, long questions & short questions for Railways on EduRev as well by searching above.
QUESTION: 1

Complete the incomplete series in the following table by selecting appropriate number from the given alternatives.

Solution:

The logic followed is row wise:

In the above table first two numbers are subtracted to get third number, then the fourth number is obtained by taking cube of third number.

First row,

12 - 10 = 2 ⇒ 23 = 8

Second row,

14 - 8 = 6 ⇒ 63 = 216

Fourth row,

18 - 4 = 14 ⇒ 143 = 2744

Similarly in third row,

16 - 6 = 10 ⇒ 103 = 1000

Hence, “1000” is correct answer.

QUESTION: 2

If “A # B means, A is mother of B”, “A % B means, A is a son of B”, “A * B means A is a father of B”, “A $ B means A is a wife of B”, then how W is related to S in the expression ‘W % T # P $ A * S’?

Solution:

From the given expression ‘W % T # P $ A * S’, we get:

‘W % T’ means ‘W is a son of T’.

‘T # P’ means ‘T is a mother of P’.

‘P $ A’ means ‘P is a wife of A’.

‘A*S’ means ‘A is a father of S’.

Thus, using the following notations, we can draw the family tree:



So, W is the uncle of S.

Hence, ‘Uncle’ is the correct answer.

QUESTION: 3

Two different type of groundnuts of Rs. 35 per kg and other is at certain price are mixed in the ratio of 5 : 2. If mixture formed is sold at Rs. 65 per kg then find the price of 10kg groundnut of other type.

Solution:

Given,

Let the price of the other groundnut type be Rs. M per kg.

Using allegation rule,

⇒ 5/2 = (M – 65) / (65 – 35)

⇒ 5 × 30 = 2M – 130

⇒ M = 140

Price of the other groundnut is Rs. 140

Required price of 10kg groundnuts of other type = 140 × 10 = Rs. 1400

QUESTION: 4

________ founded Seva Sadan in 1908.

Solution:

QUESTION: 5

Asexual reproduction differs from sexual reproduction in that in asexual reproduction _______.

Solution:
  • Asexual reproduction is carried out by a single parent through budding, fission, fragmentation, regeneration or spore formation.
  • Since only a single parent is involved, there are negligible chances of variations in the progeny.
  • As a result, the progeny appears morphologically and genetically identical to the parent. These are called clones.
QUESTION: 6

___________ is the second largest animal phylum.

Solution:
  • The first largest phylum is phylum Arthropoda and the second is phylum Mollusca including oysters, snails, clams and squid of whom there are about 100,000 living species.
  • Phylum Chordata is the third largest phylum in the animal kingdom.
QUESTION: 7

A man reaches his village 25 minutes late if he travels at a speed of 50 km/h and he reaches his village 30 minutes earlier if he travels at a speed of 60 km/h. In what time he will reach if he travels at a speed of 55 km/h?

Solution:

Given, Difference in time taken by man = 25 + 30 = 55/60 hour = 11/12 hour

Let the distance travelled by man be M km.

Given,

⇒ M/50 – M/60 = 11/12

⇒ 10M = (11 × 50 × 60)/12

⇒ M = 275 km

Given,

Speed = 55 km/h

Time taken by man = 275/55 = 5 hours

QUESTION: 8

What were the 12 states of the Sikh confederacy called?

Solution:
  • Sikhism was founded in Punjab by Guru Nanak in the 15th Century.
  • Sikh religion is believed to be have ten gurus- Guru Nanak, Guru Angad, Guru Amar Das, Guru Ram Das, Guru Arjan, Guru Hargobind, Guru Har Rai, Guru Har Krishan, Guru Tegh Bahadur, Guru Gobind Singh.
  • Misl is a term which originated in the eighteenth-century history of the Sikhs to describe a unit or brigade of Sikh warriors.
  • The 'Misldar' was the leader or commander.
QUESTION: 9

Which of the following will give a terminating decimal?

Solution:

Option 1: 12/36 = 1/3 = 0.3333333…..

Option 2: 9/36 = 1/4 = 0.25

Option 3: 3/36 = 1/12 = 0.0833333…

Option 4: 6/36 = 1/6 = 0.166666….

∴ 9/36 gives a terminating decimal

QUESTION: 10

Who has assumed the charge as Vice Chief of the Naval Staff on 30 Jan 2019?

Solution:
  • Vice Admiral G Ashok Kumar, AVSM, VSM assumed charge as Vice Chief of the Naval Staff on 30 Jan 2019.
  • Kumar has held various Staff and Command assignments during his distinguished naval career spread over more than three decades.
  • He is an alumnus of National Defence Academy, Khadakvasla, Pune and was commissioned into the Executive Branch of the Indian Navy on 01 Jul 1982.
QUESTION: 11

If Kamala is 50 m south-west of Neeta, and Ria is 50 m south-east of Neeta, then Ria is in which direction with respect to Kamala?

Solution:

The given information can be represented as,


Hence, Ria is in east direction with respect to Kamala.

QUESTION: 12

Echidna and Platypus which lay eggs belongs to the class ________.

Solution:
  • Echidna and Platypus which lay eggs belong to the class of Mammalia.
  • They possess some of the reptilian features. These are considered as primitive mammals with both mammalian and reptilian features.
  • They are also warm-blooded and they nourish their young children which are the features of mammals.
QUESTION: 13

Two pipes X and Y can individually fill a tank in 48 and 72 minutes respectively. If they are opened simultaneously, how long would it take for the tank to fill?

Solution:

Two pipes X and Y can individually fill a tank in 48 and 72 minutes respectively.

Part of tank filled by X and Y together in 1 hour = 1/48 + 1/72 = (3 + 2)/144 = 5/144

∴ Time taken by both the pipes to fill the tank = 144/5 = 28.8 minutes

QUESTION: 14

The state in which molecular attractions are very strong is ______.

Solution:
  • The molecular attractions in solid state are very strong which is why the molecules in a solid are tightly packed.
  • This gives the solid a definite shape, rigidity and high density.
QUESTION: 15

Filament of electric bulbs is generally made of ______.

Solution:
  • Filament of an electric bulb is generally made of Tungsten.
  • These bulbs create light by passing a current through a tungsten filament to heat it to 2700C.
  • The inert gas filled in the bulb prevents the filament from oxidizing and evaporating.
  • Argon is filled in electric bulbs 
QUESTION: 16

A television show lasted for  hours. If 1/5th of the total time was spent on advertisements, what was the actual duration of the televisions show?

Solution:

Television show lasted for 14/3 hours.

1/5th of the total time was spent on ads = 1/5 × 14/3 = 14/15 hours

⇒ Actual duration of television show = 14/3 – 14/15 = 70/15 – 14/15

QUESTION: 17

Directions: Read the situation given below and also take note of the effects mentioned. Then choose the correct option accordingly. 

Namisha and Sujata work at the same firm. Namisha works in the Sales department while Sujata in the Marketing department. They dislike each other and don't get along. Yesterday, Sujata's team leader tells her to work with Namisha on some project.

Effects:
I. Sujata due to her dislikings passes on the responsibility of the project to her colleague, Sheetal.
II. Sujata puts aside her differences and goes to work along with Namisha.

Solution:

When two people are working together, they should do away with their personal feelings and grudges as they as professionals owe a responsibility towards the firm. They must keep the objectives of the firm as their priority. Hence, Sujata should put aside her differences and work with Namisha. While all other options are invalid.

QUESTION: 18

Which among the following crops is affected by Fall Armyworm?

Solution:

QUESTION: 19

If the amount on a certain principal in 3 years at 12% rate of interest compounded annually is Rs. 12,000, what will be the amount (in Rs.) after the 4th year?

Solution:

The amount after 4th year is

⇒ 12000 × (1 + 0.12) = 13440

∴ Amount after 4th year is Rs. 13440.

QUESTION: 20

Select an appropriate figure from the four options that would complete the figure.

Solution:

In the first figure there is one triangle.

In the second figure the triangle is enclosed in a circle.

In the third figure the triangle, the circle is enclosed in a pentagon.

So in the fourth figure the triangle, the circle, the pentagon will be enclosed in a square.


Thus, the answer is option 3.

QUESTION: 21

Arrange the following union territories according to the decreasing order of their coastal length?

A: Lakshdweep
B: Puducherry
C: Daman & Diu
D: Andaman & Nicobar

Solution:

QUESTION: 22

Which Mineral is responsible for proper Insulin functioning in the human body?

Solution:
  • Zinc is responsible for proper Insulin functioning in the human body.
  • Insulin is a hormone made in the pancreas that regulates the level of sugar (glucose) in the blood.
  • Zinc is stored in the muscles, blood cells, skin, bone, kidney, liver and pancreas.
QUESTION: 23

In parts of South India, Lord Vishnu is also known as Lord ________.

Solution:

In parts of South India, Lord Vishnu is also known as Lord Venkateshwara. 

QUESTION: 24

To whom the president has to submit his resignation?

Solution:

Article 56 of the Indian Constitution makes it clear that the term of the President is five years from the date on which he enters the office. His term may terminate earlier (i) by resignation addressed to the Vice-President, or (ii) by removal by impeachment for violation of the Constitution.

QUESTION: 25

The total price of 15 mobile cases and 20 laptop cases is Rs. 10000 and the price of 60 laptop cases and 10 mobile cases is Rs . 23000. Find the price of 5 mobile cases and 6 laptop cases.

Solution:

Given,

Let the price of a mobile case and a laptop case be Rs. M and Rs. N respectively.

⇒ 15M + 20N = 10000

⇒ 3M + 4N = 2000

Then,

⇒ 10M + 60N = 23000

⇒ M + 6N = 2300

Solving,

⇒ 3M + 18N = 6900

⇒ 3M + 4N = 2000

⇒ 14N = 4900

⇒ N = 350

⇒ M = 2300 – 350 × 6

⇒ M = 200

Total price of 5 mobile case and 6 laptop case

= 200 × 5 + 350 × 6 = Rs. 3100

QUESTION: 26

Which King made Al-Biruni, the writer of Kitab-ul-Hind, a hostage?

Solution:
  • Al-Biruni was made hostage by Mahmud of Ghazni. He was from Khwarazm and was an Iranian scholar.
  • The title of "founder of Indology" has been given to Al-Biruni.
  • He spent many years in Ghazni and was made astrologer in the court of Mahmud of Ghazni.
  • Kitab-ul-Hind is an Arabic text written by him, wherein, he comments on Indian customs, sciences, social organization, and Hindu beliefs.
QUESTION: 27

The figures of the Mathura school of arts were made of ________.

Solution:
  • The figures of the Mathura school of arts were made of spotted red sandstone.
  • The Mathura School of arts, noted for its vitality and assimilative character, was a result of the religious zeal of Brahmanism, Jainism, and Buddhism.
  • Mathura School of Art flourished mainly during reign of Kushana emperor and reached its peak during the Gupta period in 6th or 7th century.
QUESTION: 28

Which is the fundamental particle not present in the nucleus of hydrogen atom?

Solution:
  • A hydrogen atom is an atom of the chemical element hydrogen.
  • The electrically neutral atom contains a single positively charged proton and a single negatively charged electron bound to the nucleus by the Coulomb force but no neutron is present in the nucleus of the hydrogen atom.
QUESTION: 29

Select the option that will correctly fit in the blank space in the given figure.

Solution:


Thus, the image at option 3 will complete the given figure.

QUESTION: 30

Which of the following is a prime number?

Solution:

Prime number is number having factors 1 and itself only.

⇒ 1147 = 31 × 37 × 1

⇒ 889 = 7 × 127 × 1

 997 = 997 × 1 is prime number

⇒ 899 = 29 × 31

QUESTION: 31

John is 15 years younger than Jill. 12 years ago, Jill’s age was 1.5 times that of John. Jill is now ______ years old.

Solution:

Let John and Jill age be M and N years respectively.

John is 15 years younger than Jill,

⇒ M = N - 15

12 years ago, Jill’s age was 1.5 times that of John,

⇒ 1.5(M - 12) = (N - 12)

⇒ 1.5M - 18 = N - 12

⇒ 1.5M - N = 6

⇒ 1.5N - N - 22.55 = 6

⇒ N = 57

∴ Jill is 57 years old.

QUESTION: 32

X's rank is 15th from the top, and in total, there were 40 students in the class, then X's rank from the bottom in the class is: 

Solution:

X’s rank from bottom of the class = (Total number of students) – (X’s rank from top of the class) + 1

Thus, X’s rank from bottom of the class = 40 – 15 + 1 = 26.

QUESTION: 33

In which year the Sisodiya Capital of Chittor was seized by Akbar?

Solution:
  • The Sisodiya Capital of Chittor was seized by the forces led by Akbar on 23 February 1568.
  • In 1567, the campaign of the Mughal Empire against the Kingdom of Mewar was called as ‘Siege of Chittorgarh’.
  • The ‘Siege of Chittorgarh’ happened between 20 October, 1567 – 23 February, 1568.
QUESTION: 34

The ratio of the length and the breadth of a rectangle is 11 ∶ 3. If the perimeter of the rectangle is 420 cm, then what is the breadth (in cm) of the rectangle?

Solution:

Let the length and the breadth be 11x and 3x.

We know that,

Perimeter of rectangle = 2(Length + Breadth)

⇒ Perimeter of rectangle = 420

⇒ 2(11x + 3x) = 420

⇒ 2 × 14x = 420

⇒ 28x = 420

⇒ x = 15

Then, the length = 11x = 165 and the breadth = 3x = 45

Hence, the breadth = 45 cm

QUESTION: 35

At which place did Gautam Buddha pass away?

Solution:
  • Kushinagar is the place where Gautam Buddha passed away.
  • It is an important Buddhist pilgrimage site, where Buddhists believe Gautama Buddha attained Parinirvana after his death.
QUESTION: 36

Directions: In the following question, a group of inter related words is given. Choose a word from the given alternatives, which is similar to the given words and hence belongs to the same group.

If Bihu dance is called Bharatnatyam, Bharatnatyam is called Kathak, Kathak is called Kathakali, Kathakali is called Manipuri, Manipuri is called Kuchipudi, Kuchipudi is called Gidda then which of the following is dance of Kerala?

Solution:

Kathakali is dance of Kerala but here it is mentioned that Kathaki is called Manipuri.

Hence, the answer is Manipuri.

QUESTION: 37

With the increase in the distance between two objects, the force of gravity between them ________.

Solution:

The force of gravity (F) acting between two objects is given by,

where G is the gravitational constant

           M and m are the masses of the two objects

           r is the distance between them

As evident from the above relation, the force of gravity acting between two objects is inversely proportional to the distance between them. Therefore, with the increase in the distance, the force of gravity decreases.

QUESTION: 38

In question, which one of the given responses would be a meaningful order of conversion of sugarcane to sugar?

A. Crystallization and drying
B. Crushing
C. Harvesting
D. Purification
E. Melting

Solution:

The sequence followed for conversion of sugarcane to sugar is:

First sugarcane is harvested.

Then sugar cane juice is extracted by crushing.

Then partial purification to raw cane sugar is done.

Then it is melted and filtered to remove impurities.

Finally, the purified syrup is crystallized and dried to obtain sugar.

Hence, “C, B, D, E, A” is the correct answer.

QUESTION: 39

Two businessmen A and B invest in a business in the ratio 5 ∶ 8. They decided to reinvest 30% of the profit they earned back into the business. The remaining profit they distributed amongst themselves. If A's share of the profit was Rs. 87,500 then how much profit (in Rs.) did the business make?

Solution:

Since Ratio of investment = 5 ∶ 8,

⇒ Ratio of profit distribution will also be = 5 : 8

Let us take the total profit = P

Since they decided to reinvest the 30% profit so remaining profit that is been distributed = 0.7P

⇒ A's share in the profit = 5/13 × 0.7P

⇒ 7P/26 = 87500

∴ P = Rs. 325000

QUESTION: 40

In the question given below find the odd one form the given responses.

Solution:

(1) L5R ⇒ There are 5 letters M, N, O, P, Q between L and R.

(2) H9R ⇒ There are 9 letters I, J, K, L, M, N, O, P, Q between H and R.

(3) Q3U ⇒ There are 3 letters R, S, T between Q and U.

(4) S4W ⇒ There are 3 letters T, U, V between S and W hence, this is the odd term.

Here, the correct answer is S4W.

QUESTION: 41

What is the value of (cos 30° + 1/2)?

Solution:

∴ (cos 30° + 1/2) = √3/2 + 1/2 = (√3 + 1)/2

QUESTION: 42

Which state is known to be the birthplace of Jainism?

Solution:
  • The birthplace of Jainism is known to be in Bihar
  • This is because the founder of Jainism Vardhaman Mahavir was born there in the early part of the 6th century BC
  • He is also known as the 24th Tirthankara, he was a royal prince who gave up his royal life at the age of 30 to pursue spiritual awakening.
QUESTION: 43

Pointing to a photograph, David said, “My son’s grandfather’s daughter-in-law is the daughter of this woman.”

How is the woman in the photograph related to David’s son?

Solution:


Let us represent the given relations in the form of a family tree

Clearly, the woman is the maternal grandmother of David’s son.

QUESTION: 44

A gas is said to behave like an ideal gas at ________. 

Solution:

There are no ideal gases in nature but at extremely high temperature and low-pressure conditions, some real gases such as helium, oxygen, etc obey gas laws and behave as nearly perfect gases.

QUESTION: 45

The sum of 17 observations of a data is (496 + x). if the mean of the data is x, then the value of x is.

Solution:

The sum of 17 observations of a data is (496 + x),

⇒ 17x = 496 + x

⇒ x = 31

QUESTION: 46

The height of two cylinders are equal and their radius are in the ratio of 1 : 2 respectively. What is the respective ratio of the volume of the two cylinders?

Solution:

Ratio of radius = 1 ∶ 2

Let, ratio of the first cylinder = x and ratio of second cylinder = 2x

Let, height of both cylinders = h

∴ Ratio of volume of the two cylinders,

⇒ π × x× h ∶ π × (2x)2 × h

⇒ x2 ∶ 4x2

⇒ 1 ∶ 4

QUESTION: 47

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.
1, 2, 5, 13, 34, ?

Solution:

The relation among given numbers is that they are the alternate terms of the Fibonacci sequence. The Fibonacci sequence is:

1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144…

Where every term is the sum of two previous terms in the sequence as shown:

1 + 1 = 2

1 + 2 = 3

2 + 3 = 5

3 + 5 = 8

5 + 8 = 13

8 + 13 = 21

13 + 21 = 34 and so on…

Taking alternate terms starting from the beginning, we have:

1, 2, 5, 13, 34, 89

Hence, “89” will complete the series.

QUESTION: 48

The average of 6 consecutive numbers is 12.5. If the next 3 numbers are also included, then what will be the new average?

Solution:

Given, the average of 6 consecutive numbers is 12.5.

Sum of six numbers = 6 × 12.5 = 75

Let 6 consecutive numbers be x - 3, x - 2, x - 1, x, x + 1, x + 2 respectively.

Average = sum of elements / number of elements

⇒ 12.5 = [(x - 3) + (x - 2) + (x - 1) + x + (x + 1) + (x + 2)]/6

⇒ 12.5 = [6x - 3]/6

⇒ x = 13

then the next three numbers are (x + 3), (x + 4) and (x + 5) = 16, 17 and 18

Sum of all 9 numbers = 75 + 16 + 17 + 18 = 126

Average of 9 numbers = 126/9 = 14

∴ New average is 14.

QUESTION: 49

From the given alternative words select the word which cannot be formed using the letters of the given word ‘ACCESSSORISES’?

Solution:

ESCORT → ACCESSSORISES → There is no letter ‘T’ so it cannot be formed.

ROSES → ACCESSSORISES → can be formed.

CEASE → ACCESSSORISES → can be formed.

RECESS → ACCESSSORISES → can be formed.

Hence, " ESCORT " is the answer.

QUESTION: 50

The HCF of 162, 54 and 135 is:

Solution:

⇒ 162 = 2 × 34

⇒ 54 = 2 × 33

⇒ 135 = 33 × 5

∴ H.C.F = 33 = 27

QUESTION: 51

What is the SI unit of electric current?

Solution:
  • SI unit of the electric current is Ampere.
  • It is denoted by ‘A’.
  • Ampere was named after the French scientist André-Marie Ampère.

 

QUESTION: 52

Rahi deposited Rs. 600 in a bank that promised 8% simple interest per annum. If Rahi kept the money with the bank for 5 years, she will earn an interest of:

Solution:

Let P = principal, R = rate of interest and N = time period

Simple Interest = PNR/100

∴ Simple Interest = (600 × 8 × 5)/ 100 = Rs. 240

QUESTION: 53

The repeated reflection that results in persistence of sound is called ________.

Solution:
  • The repeated reflection that results in persistence of sound is called reverberation.
  • Reverberation is related with a shorter reflection time that is, the sound reflects from a big room or an object, there would be repeated reflections from walls all around.
  • Examples of repeated reflection objects are loudspeakers, horn, trumpets, etc.
QUESTION: 54

Ringworm is caused by ________.

Solution:
  • Ringworm is a disease acquired mostly from soil or by sharing items such as comb with an infected person and it is caused by fungi belonging to genera Trichophyton, Epidermophyton, and Microsporum.
  • Symptoms include the appearance of scaly, itchy, and dry legions on body parts such as nails, skin, and scalp.
QUESTION: 55

Rahim bought a T.V. with 20% discount on marked price. If he had bought it with 25% discount, he would have saved Rs. 500. At what price did he buy the T.V.?

Solution:

Let the MP be x.

And Discount% = 20%

SP = MP - Discount

Discount = 20% of Marked price = 0.2x

SP = 0.8x

If Discount would have been 25%.

Discount = 25% of Marked price = 0.25x

SP = MP - Discount

SP = x - 0.25x = 0.75x

SP = 0.75x

Difference,

⇒ 0.8x - 0.75x = 500

⇒ x = 10000

Rquired price = 80% of marked price = 10000 × 0.8 = Rs. 8000

QUESTION: 56

According to Passport index 2019, what is the rank of Indian passport?

Solution:

The passport index 2019, which ranks almost 199 countries in the world based on their Visa-Free Scores and their ranking according to the UNDP human development index, shows that Indian passport has steadily strengthened in a period of 5 years from rank 77 in 2015 to 67 in 2019. In the year 2018, it was 1 point higher with 68 ranks.

QUESTION: 57

The large carnivores are also called ______.

Solution:
  • Large Carnivores are quaternary consumers
  • An example is a hawk that eats owls. Each food chain end with a top predator, and animal with no natural enemies.
  • Quaternary consumers are predators who eat a lot of prey, but are usually not preyed upon themselves. They are the apex predators at the top of the food chain.
QUESTION: 58

If in a coded language, COCK is written as DPDL, then how will HEN be written in that language?

Solution:

Given,


Similarly,

Hence, “IFO” is the correct answer.

QUESTION: 59

A’s Salary is 40% of B’s Salary. B’s salary is 62.5% of C’s. What Percentage of C’s salary is A’s salary?

Solution:

⇒ Let C’s salary be Rs. 100

∴ B’s salary = 62.5/100 × 100 = Rs. 62.5

⇒ A’s salary = 40/100 × 62.5 = Rs. 25

⇒ Percentage of C’s salary = 25/100 × 100 = 25%

QUESTION: 60

Directions: Read the situation given below and choose the correct answer out of the 5 options. 

Mariotte is returning home after work at 12 o clock in the night. As she is driving she hits a lady crossing the road and the lady falls down. What should Mariotte do?

Solution:

She should do everything in her power to ensure the safety of the lady first and think about the consequences later. Doing anything other than that will make her a criminal and a fugitive.

QUESTION: 61

Which of the following statements is true with respect to Simple Harmonic Motion (S.H.M.)?

Solution:
  • In the case of Simple Harmonic Motion (S.H.M), acceleration is ahead of velocity in phase by π2π2rad which is why when acceleration is 0, velocity is maximum and vice versa.
  • S.H.M or simple harmonic motion is a special type of oscillation or periodic motion where the restoring force acts in the direction opposite to the displacement and is directly proportional to it.
QUESTION: 62

What is the sum of the measures of all the interior angles of a regular polygon of 9 sides?

Solution:

For a regular polygon with n sides,

Sum of interior angles = (n - 2) 180°

∴ Sum of interior angles of a regular polygon with 9 sides = (9 - 2) × 180° = 1260°

QUESTION: 63

Choose the correct water image of the given problem figure.

Solution:

The water image is the inverted image obtained by turning the object upside down.


Thus, the water image of the given image is figure B.

QUESTION: 64

If a = 1 + √3, b = 1 – √3, then what is the value of a2 + b2?

Solution:

a2 + b2 = (a + b)2 – 2ab = (1 + √3 + 1 – √3)2 – 2 × (1 + √3) × (1 – √3) = 2– 2(1– √32) = 4 – 2(1 – 3) = 4 + 4 = 8. ((a – b) (a + b) = a– b2)

QUESTION: 65

The ratio of sand to gravel in a mixture is 7 : 8 while that between gravel and cement is 6 : 7. What is the ratio of sand to cement in the mixture?

Solution:

The ratio of sand to gravel in a mixture is 7 : 8,

⇒ S : G = 7 : 8

While that between gravel and cement is 6 : 7,

⇒ G : C = 6 : 7

⇒ S : C = 42 : 56 = 3 : 4

QUESTION: 66

Where did the Attukal Pongala festival begin on 20 February 2019?

Solution:
  • Attukal Pongala festival has begun at Thiruvananthapuram in Kerala on 20 February 2019.
  • The festival is considered as one of the world's largest religious gathering of women on a single day.
  • It is a 10-day festival celebrated at the Attukal Temple.
  • Attukal temple is also popularly known as women's Sabarimala.
  • 'Pongala' is a mix of rice, jaggery and scraped coconut.
QUESTION: 67

Which part of the plant helps in holding the plant firmly in the soil?

Solution:
  • Roots of the plant help in holding the plant firmly in the soil.
  • Roots suck water and nutrients from the soil and transfer the same into the plants.
  • Roots also help in holding the soil together.
  • Roots are generally of two types- Tap Roots and Fibrous Roots.
QUESTION: 68

Find out which one of the given alternatives will be another member of the group or of that class in place of the question mark?
Bears : squirrel : Ape : ?

Solution:

The given group is set of mammals.

In the given alternatives only bat is a mammal.

Hence, Bat is another member of the group.

QUESTION: 69

Which of the following articles is related to reservation of seats in Panchayats?

Solution:

Panchayat Raj institution was constitutionalized through the 73rd Constitutional Amendment Act of 1992 to build democracy at the grass root level.

QUESTION: 70

Right to Education became a fundamental right on _________.

Solution:
  • Right to Education became a fundamental right on April 1, 2010.
  • The Right to Education Act (RTE), is an Act of the Parliament of India enacted on 4 August 2009.
  • The Right to education is fundamental right which is given to every citizen of India by the Constitution of India.
  • The Right to education not only give the right to get an education in any region of India but also in Schools, Colleges, and Universities.
  • All children between the age of  6 to 14 have the right to get free and compulsory education under Article 21A of the Indian Constitution.
QUESTION: 71

In question select the related word from the given alternatives.
Ammeter : Anemometer : Hygrometer : ?

Solution:

The given group is set of measuring instruments.

Ammeter: It used to measure the current in a circuit

Anemometer: used for measuring wind speed

Hygrometer: It is a weather instrument used to measure the amount of humidity in the Atmosphere

Similarly:

Barometer: It is used to measure atmospheric pressure.

In the given alternatives only, barometer is a measuring instrument.

Hence, Barometer is another member of the group.

QUESTION: 72

Who was conferred with the Sasakawa Award for Disaster Risk Reduction in 2019?

Solution:
  • United Nations Office for Disaster Risk Reduction (UNDRR) conferred Sasakawa Award 2019 for Disaster Risk Reduction to Dr. Pramod Kumar Mishra.
  • He is the Additional Principal Secretary to Prime Minister of India.
  • The award was announced during the ongoing 6th Session of Global Platform for Disaster Risk Reduction (GPDRR) 2019 at Geneva.
QUESTION: 73

The relative lowering of vapour pressure is equal to the________ of the solute.

Solution:
  • The relative lowering of vapour pressure is related to the mole fraction of the solute. 
  • For any solution, the vapour pressure of the components is directly proportional to the mole fraction. 
  • Mole fraction is defined as the number of moles of a component of a solution divided by the total number of moles of the solution. 
  • It is used as a unit of concentration. 
QUESTION: 74

Puneet scored 10% marks in an exam and failed by 50 marks. If he scored 40% marks, then he gets 25 marks more than passing marks. What are the passing marks for the exam?

Solution:

Let the total marks be x

According to the question,

⇒ (10x/100) + 50 = (40x/100) – 25

⇒ 3x/10 = 75

⇒ x = 250

Thus, Total marks = 250

∴ Passing marks = {(40/100) × 250} – 25 = 100 – 25 = 75

QUESTION: 75

A man and train running at speed of 9 km/h and 72 km/h cross each other in 30 seconds in same direction. Train crosses another train in the same direction with a speed of 18 km/h in 40 seconds, then find the length of another train.

Solution:

Let the length of the train be A m.

Speed of man = 9 × 5/18 = 2.5 m/sec

Speed of train = 72 × 5/18 = 20m/sec

Given,

Relative speed = 20 – 2.5 = 17.5

⇒ A/17.5 = 30

⇒ A = 525 m

Let the length of another train be B m.

Speed of another train = 18 × 5/18 = 5 m/sec

Relative speed = 20 – 5 = 15

⇒ B/15 = 40

⇒ B = 600 m

∴ The length of another train is 600 m.

QUESTION: 76

________ is a lustrous non-metal.

Solution:
  • Iodine is a lustrous non-metal.
  • It shows lustre like metals and has lower electronegativity like other non-metals.
  • It shows the properties of both metals and non-metals.
QUESTION: 77

Select the correct combination of mathematical signs to replace ∗ signs and to balance the given equation.

20 ∗ 5 ∗ 10 ∗ 40

Solution:

Let us check out,

1) 20 ÷ 5 × 10 = 40, True

2) 20 × 5 ÷ 10 = 40, False

3) 20 ÷ 5 = 10 × 40, False

4) 20 = 5 × 10 ÷ 40, False

Hence, ‘÷, ×, =’ is correct sequence.

QUESTION: 78

A watch shows 6 p.m. when the hour hand points east. In which direction is the minute hand facing when the time is 9:15 p.m.?

Solution:

When the hour hand points east direction at 6 p.m., we can represent it as follows,

So at 9:15 p.m.

Thus at 9:15 p.m. minute hand faces in the north direction.

QUESTION: 79

Dronacharya award is given for which among the following purposes?

Solution:
  • Dronacharya Award is given to coaches for outstanding contribution towards any sports or games.
  • The award was instituted in the year 1985 and is given away every year.
QUESTION: 80

If x stands for -, ÷ stands for +, + stands for ÷ and - stands for x, which of the following gives 125 - 50 ÷ 10 + 20 × 4?

Solution:

According to the given information,


Given Expression: 125 - 50 ÷ 10 + 20 × 4

After changing the symbols:125 × 50 + 10 ÷ 20 - 4

= 6250 + 0.5 -4

= 6246.5

Hence, “6246.5” is the correct answer.

QUESTION: 81

A box contain equal number of 1 rupee, 2 rupee and 5 rupee coins. If the total amount is Rs. 184, then how many coins of each type are there?

Solution:

Let equal number of 1 rupee, 2 rupee and 5 rupee coins be x

So, (1 × x + 2 × x + 5 × x) = 184

⇒ 8x = 184

⇒ x = 23

So, number of coins is 23

QUESTION: 82

Solve the following:

Solution:


⇒ ? = 24 - [25 - {26 - (27 + 1)}]

⇒ ? = 24 - [25 - {26 - 28}]

⇒ ? = 24 - [25 + 2]

⇒ ? = 24 - 27

⇒ ? = -3

QUESTION: 83

Which of the following has an equal number of neutrons and protons?

Solution:

Deuterium is one of two stable isotopes of hydrogen. The nucleus of deuterium, called a deuteron, contains one proton and one neutron, whereas the far more common protium has no neutron in the nucleus.

QUESTION: 84

From a point P, the angle of elevation of a tower is such that its tangent is 3/4. On walking 560 metres towards the tower the tangent of the angle of elevation of the tower becomes 4/3. What is the height (in metres) of the tower?

Solution:


Let OP = x mtr and RO = h mtr

Given tan ∠RPO = ¾

⇒ h/x = ¾

⇒ 4h = 3x       ---- (1)

Given tan∠RQO = 4/3

⇒ h/ (x - 560) = 4/3

⇒ 3h = 4x - 2240

From equation (1)

⇒ 3h = 16h/3 - 2240

⇒ 7h/3 = 2240

⇒ h = 960 mtr

∴ Height of the tower = 960 mtr

QUESTION: 85

The standard deviation of the set {10, 10, 10, 10, 10} is

Solution:

From the given data,

Mean of (10, 10, 10, 10, 10) = (10 + 10 + 10 + 10 + 10)/5 = 10

Variance = [(10 - 10)2 + (10 – 10)2 + (10 – 10)2 + (10 – 10)2 + (10 – 10)2]/(5 – 1)

⇒ (0 + 0 + 0 + 0 + 0)/4 = 0/4 = 0

⇒ Standard deviation = √variance = √0 = 0

QUESTION: 86

Direction: Study the table given below carefully and answer the following question.

Based on the given data, the percentage of literates in City C is ______ (round to one decimal).

Solution:

Required percentage = (50/150) × 100 = 33.33%

QUESTION: 87

Which country will host International Association of Athletics Federations World Athletics Series Event 2021?

Solution:

Australia will host the International Association of Athletics Federations World Athletics Series Event for the first time in 25 years, following the decision to award the 2021 World Cross Country Championships to Bathurst in New South Wales.

QUESTION: 88

Find the wrong term in the series
ABCDE, BCDE, ABC, DE, E

Solution:

The series is first letter goes missing, means skipping the first letter

ABCDE, BCDE(A left), CDE(B left), DE(C left) ,E

So, the term should be CDE Instead of ABC.

QUESTION: 89

Find out which one of the given alternatives will be another member of the group or of that class in place of the question mark?
Hydrogen : Nitrogen : Oxygen : ?

Solution:

According to NASA, the gases in Earth's atmosphere are Nitrogen, Oxygen, Argon, Carbon dioxide, neon, helium, methane, krypton and hydrogen.

The given members of group are gases present in the atmosphere.

Hence, Argon is another member of the group.

QUESTION: 90

The energy released at the end of digestion is in the form of:

Solution:

The energy released at the end of digestion is chemical energy.

QUESTION: 91

Match the following Northeastern lakes of India

Solution:

QUESTION: 92

Consider the given statements to be true and decide which of the conclusions logically follow(s) from the statements.

Statements: No girl can jump. Some girls are swimmers

Conclusion I: Male swimmers can jump.

Conclusion II: Some swimmers can jump.

Solution:

The least possible Venn diagram for the given statement is as follows,


Conclusion I: Male swimmers can jump → False (as there is no data given about Male)

Conclusion II: Some swimmers can jump → False (its possible but not definite)

Hence, neither 1 nor 2 follows.

QUESTION: 93

Select the missing number from the given series.

41, 42, 46, 55, ?

Solution:

The given Series: 41, 42, 46, 55, ?

Logic behind the Series is:


Hence, the 71 will be the next term.

QUESTION: 94

Mission of Ramsar Convention is to conserve ______.

Solution:
  • The Ramsar Convention is a treaty that aims at conservation of wetlands and the wise use of the resources from the wetlands as a part of sustainable development.
  • This treaty was first adopted by the Ramsar city of Iran in 1971.
QUESTION: 95

Which of the following jumbled words is of an animal?
TLEAPHEN (word to be unjumbled)

Solution:

Elephant is an animal, we obtained by jumbling TLEAPHEN.

Hence, the answer is option 2.

QUESTION: 96

The speed of a stream is 3 km/hr. A boat goes 60 km and comes back to the starting point in 15 hours. What is the speed (in km/hr) of the boat in still water?

Solution:

Let the speed of boat be u km/hr.

Total time = Distance/Speed


By solving the above equation, we get

Speed of boat = u = 9 km/hr

QUESTION: 97

Study the following information carefully and answer the question based on it.

Identify the region that represents people who like to eat only Pizza and burger but not wraps.

Solution:

According to Venn diagram,

People eating Pizza and Burger but not wraps.

Hence, “6” is the correct answer.

QUESTION: 98

Study the following information carefully and answer the question based on it.

Identify the region that represents people who like to eat only Pizza and burger but not wraps. 

Solution:

According to Venn diagram,

The region that represents people who like to eat all the three food items (Pizza, burger and wraps).


Hence, the correct answer is ‘6’.

QUESTION: 99

Direction: Read the following information and answer the questions that follow.

Tharun, Nikitha, Surya, Priya and Akshaya are five members of a family.

They have their birthdays from August to December, each member in one of these months. Each one likes one particular item for his/her birthday out of Chocolates, Pastries, Ice cream, Cake and Sweets. The one who likes Chocolates is born in the month which is exactly in the middle in the given months. Akshaya doesn’t like Chocolates but brings Ice cream for Surya in September. Priya who is fond of Sweets is born in the month immediately after Nikitha. Nikitha doesn’t like Chocolates and Pastries and is born not in the month in which chocolates are eaten.

Q. Who was born in the month next to Akshaya? 

Solution:

Persons: Tharun, Nikitha, Surya, Priya and Akshaya.

Months: August, September, October, November and December.

Items: Chocolates, Pastries, Ice cream, Cake and Sweets.

Considering the information provided in the question:

1) The one who likes Chocolates is born in the month which is exactly in the middle in the given months.

2) Akshaya brings Ice cream for Surya in September.

 

3) Nikitha doesn’t like Chocolates and Pastries and is born not in the month in which chocolates are eaten.

4) Priya who is fond of Sweets is born in the month immediately after Nikitha.

(Hence, Nikitha is born only in the month of November and is fond of Cake. So, Priya is born in December.)

 

5) Akshaya doesn’t like Chocolates.

(Hence, she is born in the month of August.

The remaining item is Pastries and is taken in the month of August.

Hence, Tharun is born in October.)

Clearly, Surya was born in the month next to Akshaya. 

QUESTION: 100

Direction: Read the following information and answer the questions that follow.

Tharun, Nikitha, Surya, Priya and Akshaya are five members of a family.

They have their birthdays from August to December, each member in one of these months. Each one likes one particular item for his/her birthday out of Chocolates, Pastries, Ice cream, Cake and Sweets. The one who likes Chocolates is born in the month which is exactly in the middle in the given months. Akshaya doesn’t like Chocolates but brings Ice cream for Surya in September. Priya who is fond of Sweets is born in the month immediately after Nikitha. Nikitha doesn’t like Chocolates and Pastries and is born not in the month in which chocolates are eaten.

Q. In which month was Tharun born?

Solution:

Persons: Tharun, Nikitha, Surya, Priya and Akshaya.

Months: August, September, October, November and December.

Items: Chocolates, Pastries, Ice cream, Cake and Sweets.

Considering the information provided in the question:

1) The one who likes Chocolates is born in the month which is exactly in the middle in the given months.

2) Akshaya brings Ice cream for Surya in September.

 

3) Nikitha doesn’t like Chocolates and Pastries and is born not in the month in which chocolates are eaten.

4) Priya who is fond of Sweets is born in the month immediately after Nikitha.

(Hence, Nikitha is born only in the month of November and is fond of Cake. So, Priya is born in December.)

 

5) Akshaya doesn’t like Chocolates.

(Hence, she is born in the month of August.

The remaining item is Pastries and is taken in the month of August.

Hence, Tharun is born in October.)


Tharun was born in the month of October. 

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