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RRB Group D 2025 Mix Test - 42
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RRB Group D 2025 Mix Test - 42
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  • Question 1/10
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    If 2x + 1/3x = 14 then find the value of (4x2 + 1/9x2).

    Solutions

    The correct answer is option 1 i.e. 584/3.

    Given:

    2x + 1/3x = 14

    Formula used:

    (a + b)2 = a2 + b2 + 2ab       

    Calculations:

    2x + 1/3x = 14

    ⇒ (2x + 1/3x)2 = 196

    ⇒ 4x2 + 1/9x2 + 4/3 = 196

    ⇒ 4x2 + 1/9x2 = 196 - 4/3

    ⇒ 4x2 + 1/9x2 = 584/3

  • Question 2/10
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    Select the set in which the numbers are related in the same way as the numbers of the following set.

    (7, 225, 8)

    Solutions

    The correct answer is option 3 i.e. (8, 289, 9)

    Given set: (7, 225, 8)

    Pattern: (x, y, z) ⇒ y = (x + z)2

    = (7 + 8)2

    = (15)2

    = 225

    Similarly, (8, 289, 9):

    = (9 + 8)2

    = (17)2

    = 289

    Hence, the correct answer is (8, 289, 9).

  • Question 3/10
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    How many such 8s are there in the following number sequence each of which is immediately preceded by 4 or 5 but not immediately followed by 3 or 6?

    4 8 9 5 1 8 6 7 5 8 2 9 8 3 5 8 2 7 

    Solutions

    The correct answer is option 3 i.e. Three.

    Given series: 4 8 9 5 1 8 6 7 5 8 2 9 8 3 5 8 2 7 

    Clearly, 3 pairs are given in the series.

    Hence, the correct answer is Three.

  • Question 4/10
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    Who among the following has recently been appointed as the new Ambassador of India to the Netherlands by the Ministry of External Affairs?

    Solutions

    The correct answer is option 1 i.e. Kumar Tuhin.

    The Indian Foreign Service Officer of 1991 batch Shri Kumar Tuhin has recently been appointed as the Ambassador of India to Netherlands. The joining was recently announced by the Ministry of External Affairs. Kumar Tuhin is currently the Director General at Indian Council for Cultural Relations (ICCR).

  • Question 5/10
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    An AB Blood group can take blood from which among the following groups?

    Solutions

    The correct answer is option 4 i.e. All of the above.

    • Donors with type O- red blood cells are referred to as universal donors and their red blood cells can be given to any other blood type.
    • Donors with type AB+ are referred to as universal recipients and can receive red blood cells from any other blood type.
  • Question 6/10
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    The Atomic Mass Number of Oxygen is 16, it is a whole number which is equal to the sum of what?

    Solutions

    The correct answer is Option 1 i.e. Protons and Neutrons.

    • An element’s mass number (A) is the sum of the number of protons and the number of neutrons.
    • Neutral atoms of an element contain an equal number of protons and electrons. The number of protons determines an element’s atomic number (Z) and distinguishes one element from another.
  • Question 7/10
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    Which among the following is the currency of Bhutan?

    Solutions

    The correct answer is Option 2 i.e. Bhutanese Ngultrum.

    The Ngultrum serves as both the official and local currency of Bhutan, utilized in all economic transactions, whether on a professional or local scale. Identified by the currency code BTN and symbolized by Nu, it operates on a decimal system where 100 cents constitute 1 BTN. In Bhutan, cents are referred to as Chhertum.

  • Question 8/10
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    If A denotes ‘+’, B denotes ‘×’, C denotes ‘−’ and D denotes ‘÷’, then what will come in place of ‘?’ in the following equation?

    (18 B 3) D 6 A (24 D 8) B 6 C 28 A (42 B 2) = ?

    Solutions

    The correct answer is option 4 i.e. 83.

    Given the equation: (18 B 3) D 6 A (24 D 8) B 6 C 28 A (42 B 2) = ?

    Given conditions: A denotes ‘+’, B denotes ‘×’, C denotes ‘−’ and D denotes ‘÷’

    After replacement the equation becomes;

    ⇒ (18 × 3) ÷ 6 + (24 ÷ 8) × 6 - 28 + (42 × 2)

    ⇒ (54 ÷ 6) + 3 × 6 - 28 + 84

    ⇒ 9 + (3 × 6) - 28 + 84

    ⇒ 9 + 18 - 28 + 84

    ⇒ 83

    Hence, the correct answer is 83.

  • Question 9/10
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    The speed of the boat in still water is 6 km/hr. While the river is flowing at a speed of 1.2 km/hr and the boat takes 5 hours to row to a place and back. How far is the place?

    Solutions

    The correct answer is option 3 i.e. 14.4 km.

    Let the required length be D

    Speed of boat in upstream = (6 - 1.2) = 4.8 km/hr

    Speed of boat in downstream = (6 + 1.2) = 7.2 km/hr

    According to question

    ⇒ (D/4.8) + (D/7.2) = 5

    ⇒ (10D/48) + (10D/72) = 5

    ⇒ (30D + 20D)/144 = 5

    ⇒ 50D = 720

    ⇒ D = 720/50 = 14.4  km

    Distance = 14.4 km

  • Question 10/10
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    Directions For Questions

    Directions: The bar graph given below shows the amount spent by a customer on different products. Study the bar graph and answer the question carefully.

    ...view full instructions

    Find the difference between the amount spent on beauty products and cosmetic products.

    Solutions

    The correct answer is option 4 i.e. 3000.

    Calculations:

    Amount spent on beauty products = 4000

    Amount spent on cosmetic products = 1000

    Required difference = 4000 - 1000 = 3000

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