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 - 30
B
8 - 10 - 20 - 40
C
4 - 8 - 12 - 24
D
6 - 12 - 24 - 48
Question 1928
Arithmetic

If A = ÷, B = ×, C = ÷, D = − , then which of the following expressions equals 5 ?

A
96 C 12 B 45 A 3 D 14
B
96 B 12 D 45 A 3 C 14
C
96 A 12 D 45 C 3 B 14
D
96 D 12 C 45 B 3 A 14
Question 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
67.5
B
71.5
C
68.5
D
70.5
Question 1930
Arithmetic

After independence, co-operatives became an integral part of which planning initiative in India?

A
Green Revolution
B
Operation Flood
C
Five-Year Plans
D
Industrial Policy Resolution
Question 1931
Arithmetic

Which of the following does NOT contribute much to the degradation of the Thar Desert ecosystem?

A
Climate change
B
Erratic rainfall
C
Grazing by livestock
D
Increased plantation of native trees
Question 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 Pandurang
B
Dayanand Saraswati
C
Swami Vivekanand
D
Raja Ram Mohan Roy
Question 1933
Arithmetic

What should come in place of the question mark (?) in the given series? 501 500 497 492 485 ?

A
476
B
475
C
473
D
471
Question 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 sister
B
Wife's mother's mother
C
Wife's mother's sister
D
Wife's father's mother
Question 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
East
B
North
C
West
D
South
Question 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
55,000
B
66,000
C
60,500
D
49,500
Question 1937
Arithmetic

A person saves 40% of his income. If his expenditure is ₹480, then his income (in ₹) is:

A
800
B
192
C
288
D
840
Question 1938
Arithmetic

Which of the following numbers is divisible by 38?

A
1938
B
1495
C
2620
D
2423
Question 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
1597
B
1595
C
1596
D
1598
Question 1940
Arithmetic

Through which of the following plateaus does the River Damodar flow?

A
Meghalaya Plateau
B
Malwa Plateau
C
Deccan Plateau
D
Chhotanagpur Plateau
Question 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
17
B
18
C
21
D
19
Question 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
Four
B
One
C
Two
D
Three
Question 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 Swaminathan
B
Chakravarthi Rangarajan
C
Verghese Kurien
D
Krishnaswamy Kasturirangan
Question 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
Italy
B
China
C
India
D
Japan
Question 1945
Arithmetic

What is the projected population of India by 2036, according to the National Commission on Population?

A
1.38 billion
B
1.52 billion
C
1.45 billion
D
1.32 billion
Question 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, % = NHY
B
# = MKI, % = NHU
C
# = JGM, % = URX
D
# = LKP, % = FGH
Question 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, 11
B
70, 6
C
100, 11
D
60, 6
Question 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
Three
B
One
C
Two
D
Four
Question 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
28
B
26
C
24
D
20
Question 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 Directors
B
The Governor General
C
The British Crown
D
The British Parliament