RRB NTPC 2016 PYQs

Question 1

7 men and 3 women complete the work together in 10 days. 8 men and 2 women complete the same work in 8 days. How much work can be done by 12 men in one day?

Accepted Answer

Formulate two equations based on work rates: (7M + 3W) * 10 = Total Work and (8M + 2W) * 8 = Total Work. Solve these to find the individual work rates of men (M) and women (W). Then calculate 12M's one-day work as a percentage of total work.

Question 2

Pointing to the lady in the metro, Twinkle said, "she is the sister of the father of my mother's son." who is the lady to Twinkle?

Accepted Answer

Twinkle's mother's son is Twinkle's brother. The father of Twinkle's brother is Twinkle's father. The sister of Twinkle's father is Twinkle's aunt.

Question 3

Thomas Clifford Allbutt is associated with the invention of:

Accepted Answer

Thomas Clifford Allbutt is credited with inventing the short, practical clinical thermometer in 1866, revolutionizing medical diagnostics.

Question 4

Read the statements and select a conclusion from the given alternatives:Statements:Some doors are shelves. All the shelves are windows.Conclusions:1. Some doors are windows.2. No shelf is door

Accepted Answer

From the statements, 'Some doors are shelves' and 'All shelves are windows', it logically follows that 'Some doors are windows'. Conclusion 2 contradicts the first statement.

Question 5

If the Standard deviation of a distribution is 9, what is the value of variance?

Accepted Answer

Variance is the square of the standard deviation. Given standard deviation is 9, so variance = 9² = 81.

Question 6

If the average age of 40 students in Class I is 10 years and the average age of 30 students in Class II is 12 years, find the average age (in years) for all students.

Accepted Answer

Calculate total age for Class I (40*10=400) and Class II (30*12=360). Sum total ages (400+360=760) and divide by total students (40+30=70). Average = 760/70 = 10.85.

Question 7

Antonio Meucci is associated with the invention of:

Accepted Answer

Antonio Meucci was an Italian inventor who developed a voice communication apparatus, which he called the 'teletrofono'. He is recognized for his pioneering work on the telephone.

Question 8

Pointing to person, Aranav said to Preeti, "His mother is the only daughter of your father”. How was Preeti related to that person?

Accepted Answer

Preeti's father's only daughter is Preeti herself. So, the person's mother is Preeti. Therefore, Preeti is the person's mother.

Question 9

Fill in the blanks with suitable option:A/An__________ turns blue litmus red and a/an________ turns_________ litmus blue.

Accepted Answer

Acids turn blue litmus red. Bases turn red litmus blue. This is a fundamental property used to distinguish between acids and bases.

Question 10

Keeping voltage constant, if more lamps are put into a series circuit, the overall current in the circuit:

Accepted Answer

Adding more lamps in series increases the total resistance of the circuit. According to Ohm's Law (I=V/R), with constant voltage, increased resistance leads to decreased current.

Question 11

Which city hosted the first ‘India International Science Festival, 2015’?

Accepted Answer

The first India International Science Festival in 2015 was held in New Delhi. This is a direct factual recall question.

Question 12

In a fruit basket, the ratio of number of apples to bananas is A and the ratio of bananas to apples is B, then A+B is:

Accepted Answer

Let apples be 'a' and bananas be 'b'. A = a/b and B = b/a. Since a and b are positive, A and B are positive reciprocals. The sum of a positive number and its reciprocal is always greater than or equal to 2.

Question 13

Directions (Qs 50-52): Read the passage given below and answer the questions that follow:
Prerna, Qutub, Rahul, Stalin, Tuhin, Ujala, Varun, and Waheeda are sitting around a circle facing the centre.
Waheeda is to the immediate left of Prerna but is not the neighbor of Tuhin or Stalin.
Ujala is to the immediate right of Qutub.
Varun is sitting next to Tuhin.
Rahul is sitting between Tuhin and Ujala.

What is the position of Stalin?

Accepted Answer

Without a seating arrangement diagram or description, it's impossible to determine Stalin's position. The question is incomplete and cannot be answered.

Question 14

When was the GSLV used in India for the first time?

Accepted Answer

The Geosynchronous Satellite Launch Vehicle (GSLV) was first used by India in the year 2001. The options provided do not include the correct answer.

Question 15

Two positive integers are in the ratio of 3 : 4. If the product of the two numbers is 1728, what is the value of the greater number?

Accepted Answer

Let the numbers be 3x and 4x. Their product is 12x² = 1728. Solving for x, x² = 144, so x = 12. The greater number is 4x = 4 * 12 = 48.

Question 16

In a right-angled triangle, the longest side is 1 cm longer than the middle side and the middle side is 49 cm longer than the shortest side. Calculate the length of the shortest side.

Accepted Answer

Let sides be x, x+49, x+50. Apply Pythagoras theorem: x² + (x+49)² = (x+50)². Solve the quadratic equation to find x=11.

Question 17

What fraction of 2 hours is 18 seconds?

Accepted Answer

Convert 2 hours to seconds: 2 hours * 60 minutes/hour * 60 seconds/minute = 7200 seconds. The fraction is 18/7200, which simplifies to 1/400.

Question 18

If a box contains 3 white cushions, 4 red cushions and 5 blue cushions, what is the probability of selecting a white or blue cushion?

Accepted Answer

Total cushions are 3+4+5 = 12. Favorable outcomes (white or blue) are 3+5 = 8. Probability is 8/12, which simplifies to 2/3.

Question 19

Gitesh took a loan for 6 years at 5% simple interest. If the total interest paid was ₹615, calculate the principal.

Accepted Answer

Use the simple interest formula: Principal = (Interest × 100) / (Rate × Time). Substitute the given values: (615 × 100) / (5 × 6) = 61500 / 30 = ₹2050.

Question 20

IRS series of Indian Satellites are used for

Accepted Answer

IRS stands for Indian Remote Sensing satellites. These satellites are specifically designed and used for remote sensing applications, including resource monitoring and environmental studies.