RRB-NTPC 2021 Mathematics
Practice subject-wise previous year questions
Question 1926
Arithmetic
Which of the following is true about trichomes on the stem?
A
They never function in water retention.B
They are multicellular and may be secretory.C
They are present only in the roots.D
They are always unbranched and unicellular.Question 1927
Arithmetic
Two sets of numbers are given below. In each set of numbers, certain mathematical operation(s) on the first number result(s) in the second number. Similarly, certain mathematical operation(s) on the second number result(s) in the third number and so on. Which of the given options follows the same set of operations as in the given sets? (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into their constituent digits. E.g. 13 - Operations on 13 such as adding / subtracting /multiplying to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.) 10 - 20 - 40 - 80 3 - 6 - 12 - 24
A
5 - 10 - 20 - 30B
8 - 10 - 20 - 40C
4 - 8 - 12 - 24D
6 - 12 - 24 - 48Question 1928
Arithmetic
If A = ÷, B = ×, C = ÷, D = − , then which of the following expressions equals 5 ?
A
96 C 12 B 45 A 3 D 14B
96 B 12 D 45 A 3 C 14C
96 A 12 D 45 C 3 B 14D
96 D 12 C 45 B 3 A 14Question 1929
Arithmetic
The average weight of 10 boys is 70 kg. But later, it was found that at two places the weight 54 kg was read as 44 kg and at one place weight 35 kg was read as 40 kg. Find the correct average weight (in kg) of the 10 boys.
A
67.5B
71.5C
68.5D
70.5Question 1930
Arithmetic
After independence, co-operatives became an integral part of which planning initiative in India?
A
Green RevolutionB
Operation FloodC
Five-Year PlansD
Industrial Policy ResolutionQuestion 1931
Arithmetic
Which of the following does NOT contribute much to the degradation of the Thar Desert ecosystem?
A
Climate changeB
Erratic rainfallC
Grazing by livestockD
Increased plantation of native treesQuestion 1932
Arithmetic
Who is referred to as the 'Father of the Indian Renaissance' due to their contribution in social reform, literary works and unwavering patriotism?
A
Atmaram PandurangB
Dayanand SaraswatiC
Swami VivekanandD
Raja Ram Mohan RoyQuestion 1933
Arithmetic
What should come in place of the question mark (?) in the given series? 501 500 497 492 485 ?
A
476B
475C
473D
471Question 1934
Arithmetic
In a certain code language, A + B means 'A is the mother of B' A - B means 'A is the brother of B' A x B means 'A is the wife of B' and A ÷ B means 'A is the father of B'. How is M related to Q if 'M + N ÷ O-P x Q'?
A
Wife's father's sisterB
Wife's mother's motherC
Wife's mother's sisterD
Wife's father's motherQuestion 1935
Arithmetic
Town E is to the east of Town F. Town F is to the south of Town G. Town G is to the east of Town H. Town H is to the west of Town I. Town E is to the south-west of Town I. What is the position of Town G with respect to Town I?
A
EastB
NorthC
WestD
SouthQuestion 1936
Arithmetic
Ashish's salary is ₹11,000 per month. He spends ₹4,000 on house rent and ₹1,500 on bills, and the rest of the amount is his monthly savings. Find his savings (in ₹) in a year, if in the month of his birthday, he spent all his monthly savings on birthday celebrations.
A
55,000B
66,000C
60,500D
49,500Question 1937
Arithmetic
A person saves 40% of his income. If his expenditure is ₹480, then his income (in ₹) is:
A
800B
192C
288D
840Question 1938
Arithmetic
Which of the following numbers is divisible by 38?
A
1938B
1495C
2620D
2423Question 1939
Arithmetic
A can do a piece of work in 57 hours, B and C together can do it in 28 hours, while A and C together can do it in 19 hours. How long (in hours) will B alone take to do it?
A
1597B
1595C
1596D
1598Question 1940
Arithmetic
Through which of the following plateaus does the River Damodar flow?
A
Meghalaya PlateauB
Malwa PlateauC
Deccan PlateauD
Chhotanagpur PlateauQuestion 1941
Arithmetic
This question is based on the five, three-digit numbers given below. (Left) 898 740 280 169 993 (Right) (Example: 697 - First digit = 6, second digit = 9 and third digit = 7) (NOTE: All operations to be done from left to right.) What will be the resultant if the first digit of the highest number is added to the third digit of the lowest number?
A
17B
18C
21D
19Question 1942
Arithmetic
Refer to the following number and symbol series and answer the question that follows. Counting to be done from left to right only. (Left) 8 £ 6 @ & %46 @ 8$ 7 & 3 Ω 9 # 1 * 4 5 (Right) How many such symbols are there each of which is immediately preceded by an even number and also immediately followed by an odd number?
A
FourB
OneC
TwoD
ThreeQuestion 1943
Arithmetic
Who was the chairman of the National Commission on Farmers (NCF) when it was constituted on 18 November 2004 in India?
A
MS SwaminathanB
Chakravarthi RangarajanC
Verghese KurienD
Krishnaswamy KasturiranganQuestion 1944
Arithmetic
Which country hosted the 58th Annual Meeting of the Asian Development Bank (ADB) in 2021, where India discussed the Strategic Action Plan 2021-2029?
A
ItalyB
ChinaC
IndiaD
JapanQuestion 1945
Arithmetic
What is the projected population of India by 2036, according to the National Commission on Population?
A
1.38 billionB
1.52 billionC
1.45 billionD
1.32 billionQuestion 1946
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 ::? #: OLR :: PMS : %
A
# = KLM, % = NHYB
# = MKI, % = NHUC
# = JGM, % = URXD
# = LKP, % = FGHQuestion 1947
Arithmetic
In the following number-pairs, the second number is obtained by applying certain mathematical operations to the first number. Select the set in which the numbers are related in the same way as are the numbers of the following sets. (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into their constituent digits. E.g. 13 - Operations on 13 such as adding/subtracting/multiplying to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.) 50, 4 80, 7
A
90, 11B
70, 6C
100, 11D
60, 6Question 1948
Arithmetic
Seven people, I, J, K, L, O, P and Q are sitting in a row, facing north. No one sits to the right of I. Only three people sit between I and J. Only two people sit between J and Q. L sits third to the left of P. K sits to the immediate right of P. How many people sit between O and Q?
A
ThreeB
OneC
TwoD
FourQuestion 1949
Arithmetic
If 2 is added to each even digit and 2 is added to each odd digit in the number 7362145, what will be the sum of all the odd digits in the new number thus formed?
A
28B
26C
24D
20Question 1950
Arithmetic
According to the Regulating Act of 1773 of the East India Company, to whom did the governors of Madras and Bombay report regularly?
A
Court of DirectorsB
The Governor GeneralC
The British CrownD
The British Parliament