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RRB Group D Mock Test - 22 - Railways MCQ


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30 Questions MCQ Test - RRB Group D Mock Test - 22

RRB Group D Mock Test - 22 for Railways 2024 is part of Railways preparation. The RRB Group D Mock Test - 22 questions and answers have been prepared according to the Railways exam syllabus.The RRB Group D Mock Test - 22 MCQs are made for Railways 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for RRB Group D Mock Test - 22 below.
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RRB Group D Mock Test - 22 - Question 1
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Bhim can complete a work in 15 days and Amar can do the same work in 18 days. Bhim worked for 10 days and left the job. In how many days, Amar alone can finish the remaining work?

Detailed Solution for RRB Group D Mock Test - 22 - Question 1

Explanation in English :

Bhim’s 1 day work = 1/15

∴ Bhim’s 10 day work = 10 * 1/15 = 2/3

Remaining work = (1 – 2/3) = 1/3

Now, 1/18 work is done by Amar in 1 day.

∴ 1/3 work is done by Amar in (18 * 1/3) = 6 days.

RRB Group D Mock Test - 22 - Question 2
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The present ages of Muni and Pani are in the ratio 15 : 8. After 8 years, their ages will be in the ratio 17 : 10. The present age of Muni is

Detailed Solution for RRB Group D Mock Test - 22 - Question 2

Explanation in English :

Let present ages of Muni and Pani be 15x and 8x.

According to given statement

(15x + 8)/(8x + 8) = 17/10

150x + 80 = 136x + 136

14x = 56

x = 4

Hence, present age of Muni = 15x

= 15 X 4 = 60 years.

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RRB Group D Mock Test - 22 - Question 3
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In a rectangle, the length is thrice its breadth. If the area of the rectangle is 6075 cm2, the length will be

Detailed Solution for RRB Group D Mock Test - 22 - Question 3

Let the breadth of rectangle be ‘b’ cm

∴ length will be = ‘3b’ cm

=> b * 3b = 6075

=> b2 = 6075/3 = 2025

=> b = 45 cm

Length of the rectangle = 3 * 45 = 135 cm.

RRB Group D Mock Test - 22 - Question 4
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The profit earned after selling a box for Rs. 1516 is the same as loss incurred after selling it for Rs. 1112. What is the cost price of the box?
Detailed Solution for RRB Group D Mock Test - 22 - Question 4

According to the given statement

1516 – x = x – 1112, where x is the CP

2x = 2628

x = CP = Rs. 1314

RRB Group D Mock Test - 22 - Question 5
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The average age of 80 kids in a class is 15. The average age of a group of 15 kids in the class is 16 and the average age of another 25 kids in the class is 14. What is the average age of the remaining kids in the class?
Detailed Solution for RRB Group D Mock Test - 22 - Question 5

Let S80 be the sum of the ages of kids

S15 be the sum of the ages of a group of 15 kids

S25 be the sum of the ages of another 25 kids

As per problem,

S80 = 15 X 80 = 1200

S15 = 16 X 15 = 240

S25 = 14 X 25 = 350

Sum of the ages of remaining kids = 1200 – (S15 + S25)

= 1200 – (240 + 350)

= 1200 – 590

= 610

∴ Average = 610/40 = 15.25

RRB Group D Mock Test - 22 - Question 6
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Ramya purchased an item of Rs. 460 and sold it at loss of 12 percent. With that amount, she purchased another item and sold it at a gain of 12 percent. What was her overall gain/loss?
Detailed Solution for RRB Group D Mock Test - 22 - Question 6

Explanation in English :

Loss of 12% = (88/100) X 460

= Rs. 404.8

On this amount, profit of 12% = (112/100) X 404.8

= 453.376

In overall transaction, since CP is greater than SP, it’s loss

Loss = 460 – 453.376

= Rs. 6.624

RRB Group D Mock Test - 22 - Question 7
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16 fitters and 12 welders together can complete a work in 8 days. 20 fitters can complete the same work in 16 days. How many days will 16 welders take to complete the same work?
Detailed Solution for RRB Group D Mock Test - 22 - Question 7

F = Fitter; W = Welder

(16F + 12W) X 8 = 20F X 16

128F + 96W = 320F

96W = 192F

W = 2F

∴ 20 fitters will correspond to 10 welders

10 welders can complete the work in 16 days

∴ 16 welders can complete the work in (16 X 10)/16

= 10 days

RRB Group D Mock Test - 22 - Question 8
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The average height of 34 students of a school is 150 cm. If the height of the teacher is included, the average rises by 1 cm. Find the height of the teacher.
Detailed Solution for RRB Group D Mock Test - 22 - Question 8

et S34 be the sum of the heights of students

S35 be the sum of the heights of students + teacher

As per problem,

S34 = 150 X 34 = 5100

S35 = 151 X 35 = 5285

Height of the teacher = 5285 – 5100

= 185 cm

RRB Group D Mock Test - 22 - Question 9
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A sum of money becomes 3 times in 5 years under simple interest. In how many years it will become 5 times at the same rate of simple interest?
Detailed Solution for RRB Group D Mock Test - 22 - Question 9

As per given statement,

(P X 5 X R)/100 = 2P

R = 40%

In second case,

(P X T X 40)/100 = 4P

=> T = 10 years

RRB Group D Mock Test - 22 - Question 10
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Which is the least number to be subtracted from 3198 to make it a perfect square?
Detailed Solution for RRB Group D Mock Test - 22 - Question 10

The perfect squares, between which 3198 lies, are

3136 and 3249

3136 < 3198 < 3249

∴ 3198 – 3136 = 62 is the number which has to subtracted from 3198 to make it a perfect square.

RRB Group D Mock Test - 22 - Question 11
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What will come in the place of question mark?

326, 982, 353, 1009, 380, ?
Detailed Solution for RRB Group D Mock Test - 22 - Question 11

Explanation in English :

 

326(+27=) 353(+27=)380

982(+27=) 1009(+27=) 1036

Explanation in Hindi :

 

326(+27=) 353(+27=)380

982(+27=) 1009(+27=) 1036

RRB Group D Mock Test - 22 - Question 12
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What will come in the place of question mark?

63, 54, 45, 36, ?
Detailed Solution for RRB Group D Mock Test - 22 - Question 12

63(-9=) 54(-9=) 45(-9=) 36(-9=) 27

Explanation in Hindi :

 

63(-9=) 54(-9=) 45(-9=) 36(-9=) 27

RRB Group D Mock Test - 22 - Question 13
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What will come in the place of question mark?

147, 130, 113, 96, ?
Detailed Solution for RRB Group D Mock Test - 22 - Question 13

 

147(-17=) 130(-17=) 113(-17=) 96(-17=) 79

Explanation in Hindi :

 

147(-17=) 130(-17=) 113(-17=) 96(-17=) 79

RRB Group D Mock Test - 22 - Question 14
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As per following data, solve the questions
Detailed Solution for RRB Group D Mock Test - 22 - Question 14

[(3/5) X 60] + [(2/5) X 40] = 36 + 16 = 52

RRB Group D Mock Test - 22 - Question 15
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Total number of boys from Class 5, 6 and 7 is
Detailed Solution for RRB Group D Mock Test - 22 - Question 15

[(2/5) X 60] + [(3/5) X 40] + [(2/3) X 30]

= 24 + 24 + 20

= 68

RRB Group D Mock Test - 22 - Question 16
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Difference between 5th class girls and 7th class boys is
Detailed Solution for RRB Group D Mock Test - 22 - Question 16

[(2/3) X 30] ~ [(3/5) X 60] = 20 ~ 36

= 16

RRB Group D Mock Test - 22 - Question 17
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The sum of a number and its four-fifth is 27. What is the number?
Detailed Solution for RRB Group D Mock Test - 22 - Question 17

If x is the required number,

Then according to the problem statement

x + (4/5)x = 27

5x + 4x = 135

9x = 135

x = 15

RRB Group D Mock Test - 22 - Question 18
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If + means *, - means ÷, * means -, ÷ means +, then solve the following
Detailed Solution for RRB Group D Mock Test - 22 - Question 18

25 + 6 – 2 * 1 = ?

25 X 6 ÷ 2 – 1 = ?

25 X 3 – 1 = ?

75 – 1 = ?

∴ ? = 74

RRB Group D Mock Test - 22 - Question 19
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10 – 5 - 4 + 1 X 2 = ?
Detailed Solution for RRB Group D Mock Test - 22 - Question 19

10 – 5 - 4 + 1 X 2 = ?

10 ÷ 5 ÷ 4 X 1 – 2 = ?

2 ÷ 4 X 1 – 2 = ?

(1/2) – 2 = ?

∴ ? = -1.5

RRB Group D Mock Test - 22 - Question 20
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A person is standing at a distance from a flag post and the height of the flag post is 20 m. Angle of elevation from his toe is 45o. How far is he standing from the flag post?
Detailed Solution for RRB Group D Mock Test - 22 - Question 20


 

tan 450 = 20/x, where x = distance of the person from the flag post

1 = 20 / x

∴ x = 20 m

RRB Group D Mock Test - 22 - Question 21
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In a regular pentagon, the exterior angle will be ______
Detailed Solution for RRB Group D Mock Test - 22 - Question 21

RRB Group D Mock Test - 22 - Question 22
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The average speed of a bus is 4/5th the average speed of a bike. The bike covers 520 km in 8 h. How much distance (in km) will the bus cover in 9 h?
Detailed Solution for RRB Group D Mock Test - 22 - Question 22

Average speed of bike = 520/8 = 65 km/h

Average speed of bus = 4/5 * 65 = 52 km/h

Distance covered by bus = 52 * 9 = 468 km.

RRB Group D Mock Test - 22 - Question 23
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A train crosses a platform in 60 sec and a man standing on the platform in 20 sec. What is the length of the platform? (Consider length of train to be 280m)
Detailed Solution for RRB Group D Mock Test - 22 - Question 23

Let the length of platform be x m.

Speed of train = (x + 280)/60 = 280/20

=> (x + 280)/60 = 14

=> x + 280 = 840

=> x = 560 m.

RRB Group D Mock Test - 22 - Question 24
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Angle in the semi-circle will be
Detailed Solution for RRB Group D Mock Test - 22 - Question 24

RRB Group D Mock Test - 22 - Question 25
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The factors of x2 + 16x + 48 are
Detailed Solution for RRB Group D Mock Test - 22 - Question 25

x2 + 12x + 4x + 48

= x(x + 12) + 4(x + 12)

= (x + 12) (x + 4)

RRB Group D Mock Test - 22 - Question 26
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Which of the following has the longest wavelength?
Detailed Solution for RRB Group D Mock Test - 22 - Question 26

Red light has longest wavelength = 620-740 nm

RRB Group D Mock Test - 22 - Question 27
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Optical fiber works on the principle of
Detailed Solution for RRB Group D Mock Test - 22 - Question 27

An optical fiber is a cylindrical dielectric waveguide, that transmits light along its axis, by the process of total internal reflection.

RRB Group D Mock Test - 22 - Question 28
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SONAR is based on the principle of
Detailed Solution for RRB Group D Mock Test - 22 - Question 28

Sonar uses the echo principle by sending out sound waves underwater or through the human body to locate objects.

RRB Group D Mock Test - 22 - Question 29
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1 amu is equal to –
Detailed Solution for RRB Group D Mock Test - 22 - Question 29

1 a.m.u. = 1.6726219 × 10−24 g

1 a.m.u. = 1.6726219 × 10−27 kg

RRB Group D Mock Test - 22 - Question 30
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Bar is unit of –
Detailed Solution for RRB Group D Mock Test - 22 - Question 30

No explanation provided

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