RRB-NTPC 2021 Mathematics
Practice subject-wise previous year questions
Question 2526
Arithmetic
Select the pair that follows the same pattern as that followed by the two pairs given below. Both pairs follow the same pattern. KNR: HKS TGK: QDL
A
LOQ: FJUB
FXL: CUMC
HMI: DKLD
GCP: EHRQuestion 2527
Arithmetic
Which of the following is the easternmost international border point of India?
A
RohtangB
LipulekhC
Nathu LaD
KibithuQuestion 2528
Arithmetic
Amit had invested same amount of sums at simple as well as compound interest, compounded annually. The time period of both the sums was 2 years and rate of interest too was the same, 4% per annum. At the end, he found a difference of ₹45 in both the interests received. What were the sums (in ₹) invested?
A
27,375B
28,125C
27,225D
28,475Question 2529
Arithmetic
Three numbers are in the ratio 1: 3: 5, and their LCM is 285. Their HCF is ______.
A
19B
15C
17D
24Question 2530
Arithmetic
In January 2021, which of the following individuals was appointed as the Chairman of the Indian Space Research Organisation (ISRO)?
A
V NarayananB
Tapan MisraC
G Madhavan NairD
K SivanQuestion 2531
Arithmetic
The fourth proportion to 9, 3 and 27 is the same as the third proportion to A and 24. What is the value of A?
A
61B
63C
62D
64Question 2532
Arithmetic
The length of the diagonals of a rhombus are $(y + xy + 5)$ m and $(y-xy + 7)$ m, respectively. Find the area of the rhombus, if $x = 2$ and $y = 1$.
A
27 m²B
18 m²C
21 m²D
24 m²Question 2533
Arithmetic
Which of the following is INCORRECT based on the Supreme Court's ruling in 'Samtola Devi vs The State Of Uttar Pradesh', on 27 March 2021, regarding the 'Maintenance and Welfare of Parents and Senior Citizens Act, 2007'?
A
Senior citizens can file for maintenance even after transferring their property to their legal heirs.B
Eviction of a child or relative is mandatory in every case of neglect under the Act.C
The Act does not provide any provision for the eviction of a child or relative.D
Tribunals under the Act have the authority to order the eviction of a child or relative if it is deemed necessary for the protection of the senior citizen.Question 2534
Arithmetic
On 26 February 2021, the Centre for Science and Environment (CSE) and Down To Earth (DTE) magazine released their annual publication 'State of India's Environment' from which state?
A
West BengalB
RajasthanC
GujaratD
KeralaQuestion 2535
Arithmetic
If it is 12 noon at IST (82°30′E), what time is it approximately at 97°30'E longitude?
A
11:00 AMB
12:30 PMC
1:20 PMD
1:00 PMQuestion 2536
Arithmetic
A salesman marks his good 20% above the cost price and gives a discount of 25% on them. Find the percentage of this gain or loss.
A
9% gainB
10% lossC
11% lossD
12% lossQuestion 2537
Arithmetic
A shopkeeper fixes the marked price of an item 50% above its cost price. What percentage of discount on the marked price should be allowed to gain 14%?
A
21%B
27%C
26%D
24%Question 2538
Arithmetic
What should come in place of the question mark (?) in the given series? 282, 259, 226, ?, 130, 67
A
173B
183C
193D
186Question 2539
Arithmetic
If the median of a data is 71.24 less than its mode, then the median of the data exceeds its mean by _______. (Use the empirical formula)
A
34.14B
35.62C
41.97D
33.91Question 2540
Arithmetic
With reference to computing, what does ASCII stand for?
A
American Standard Code for Information IntegrityB
American Systematic Code for International InteroperabilityC
Algorithmic Standard Code for International InformationD
American Standard Code for Information InterchangeQuestion 2541
Arithmetic
A and B can do a piece of work in 12 days and 18 days, respectively. Both work for 2 days and then A goes away and B completed the remaining work alone. The whole work was completed in ______ days.
A
13B
14C
15D
16Question 2542
Arithmetic
Following the provisions of the 73rd Constitutional Amendment 1992, how frequently are the members of the Gram Sabha expected to meet in a year?
A
At least twice in a yearB
Every weekC
Once a monthD
Once every five yearsQuestion 2543
Arithmetic
Gyanesh starts from Point Y and drives 11 km towards the south. He then takes a left turn, drives 45 km, turns right and drives 29 km. He then takes a right turn and drives 18 km. He takes a right turn, drives 13 km. He then turns right, drives 29 km, turns left and drives 27 km to stop at Point Z. How far (shortest distance) and towards which direction should he drive in order to reach Point Y again? (All turns are 90-degree turns only unless specified.)
A
53 km towards the northB
61 km towards the westC
56 km towards the westD
51 km towards the eastQuestion 2544
Arithmetic
What is the primary objective of 'Srjanam', the biomedical waste conversion system launched in 2021?
A
To increase the use of landfills for biomedical wasteB
To reduce environmental hazards by eliminating incinerationC
To promote traditional biomedical waste disposal methodsD
To develop a new method for incinerationQuestion 2545
Arithmetic
Chords AB and CD of a circle intersect externally at P. If AB = 7 cm, CD = 1 cm and PD = 5 cm, then the length of PB (in cm) is:
A
3B
4C
2D
5Question 2546
Arithmetic
Based on the English alphabetical order, three of the following four letter-cluster pairs are alike in a certain way and thus form a group. Which is the letter-cluster pair that DOES NOT belong to that group? (Note: The odd one out is not based on the number of consonants/vowels or their position in the letter-cluster.)
A
OJ - NLB
IK - PRC
HJ - OQD
GI - NPQuestion 2547
Arithmetic
A train is 591 m and it crosses a platform in 1.7 minutes running at the speed of 36 km/hr. Find the difference between the length of the train and the platform.
A
162 mB
171 mC
170 mD
159 mQuestion 2548
Arithmetic
What natural feature existed between the Himalayas and the Deccan Plateau before the formation of the Great Plain?
A
A mountain rangeB
A deep ocean trenchC
A shallow trough or geosynclineD
A dense forestQuestion 2549
Arithmetic
Which of the following ratios is greatest?
A
19:37B
10:15C
15:33D
18:37Question 2550
Arithmetic
Which of the following letter-clusters should replace # and % so that the pattern and relationship followed between the letter-cluster pair on the left side of :: is the same as that on the right side of :: ? #: VXB :: GIM : %
A
# = SUY, % = LLPB
# = SUY, % = JLPC
# = SEY, % = JLPD
# = SUY, % = JLL