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RRB Technician (Grade-I) 2025 Mix Test - 21
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RRB Technician (Grade-I) 2025 Mix Test - 21
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  • Question 1/10
    1 / -0.33

    The value of inductance needed to store 4kWh of energy in a coil carrying a 2000A current is:

    Solutions

    Correct Answer is: 7.2 H

  • Question 2/10
    1 / -0.33

    A hollow cylindrical pipe is open at both ends. The external radius is 15 cm and the internal radius is 8 cm. The length of the pipe is 28 cm and it is coated with rust-proof polish on the inner and outer curved surfaces as well as on both circular rings at the ends, at a rate of ₹2.20 per cm². If the polisher asks for 25% of the total cost in advance, how much amount remains to be paid? (Use π = 22/7)

    Solutions

    Given:

    Hollow cylinder: external radius, R = 15 cm, internal radius, r = 8 cm, length L = 28 cm

    Polish rate = ₹2.20/cm2

    Advance paid = 25% of total cost.

    Formula Used:

  • Question 3/10
    1 / -0.33

    If the value of the common base current gain (α) is 0.98, then the value of the common collector current gain (γ) is ___________.

    Solutions

    Correct Answer is: 50

  • Question 4/10
    1 / -0.33

    In File Explorer of Windows 11, which of the following tabs includes the 'hidden items' option?

    Solutions

    Correct Answer is: View

    The 'View' tab in the File Explorer of Windows 11 includes the option to show or hide hidden items. This allows users to view files and folders that are usually hidden from the default view.

    (a) Home: This is incorrect because the Home tab contains basic file operations like copy, paste, and delete, not the hidden items option.

    (b) File: This is incorrect because the File tab generally contains options related to file management, such as opening and saving files, not viewing hidden items.

    (d) Share: This is incorrect because the Share tab is used for sharing files and does not contain the option to view hidden items.

  • Question 5/10
    1 / -0.33

    The diameters of the two circular ends of a bucket are 44 cm and 24 cm. The height of the bucket is 35 cm. The capacity of the bucket is:

    Solutions

    Correct Answer is: 32.7 litre

    Given:

    Height, h = 35 cm

    Diameter of larger end, D = 44 cm

    Diameter of smaller end, d = 24 cm

    Radii:

    Therefore, the capacity of the bucket is approximately 32.7 litre.

    Correct answer: (d) 32.7 litre

  • Question 6/10
    1 / -0.33

    In the following question, two positions of a die are given. Which number will appear on the face opposite to the face with the number 4?

    Solutions

    Correct Answer is: 2

    Logic: ​In these types of dice problems, we should write all three numbers/letters in clockwise or anticlockwise from a fix common number/letter.

    Clock wise rotate:

    So, the opposite of 4 is: 2

    Thus, the correct option is: (b)

  • Question 7/10
    1 / -0.33

    A megger has ____ current coil(s) and ____ potential coil(s).

    Solutions

    Correct Answer is: 1, 2

    Current coil (1 coil): This coil is also known as the deflecting coil. It is connected in series with the unknown resistance being measured.

    Potential coils (2 coils): Also known as pressure or control coils, these are connected in parallel across the circuit under test. These two coils, often labeled V1 and V2, are arranged to produce opposing torques, which allows the instrument to give accurate readings across its entire scale, from zero to infinity.

  • Question 8/10
    1 / -0.33

    If 8th and 12th terms of an A.P. be 82 and 478 respectively, then its 50th term is:

    Solutions

    Given:

    The 8th term of the A.P. is 82, and the 12th term is 478.

    We are required to find the 50th term of the A.P.

    Formula Used:

    The formula for the nth term of an A.P. is:

    Solution:

    Let the first term be 'a' and the common difference be 'd'.

    Using the given information, we have the following two equations:

    By subtracting the first equation from the second:

    a + 11d - (a + 7d) = 478 - 82

    4d = 396

    d = 396 / 4 = 99

    Now substitute d = 99 into the first equation to find a:

    a + 7 ×​ 99 = 82

    a = 82 - 693 = - 611

    Now we can find the 50th term using the formula:

  • Question 9/10
    1 / -0.33

    In CRO, the measurement of time period is obtained by the product of the number of divisions occupied by one cycle and ________.

    Solutions

    Correct Answer is: Time/Division

    Time period: The time it takes for one complete cycle of a waveform to pass a given point.

    Number of divisions: The number of horizontal divisions on a Cathode Ray Oscilloscope (CRO) that a single cycle occupies.

    Time/Division: This setting on the CRO indicates how much time each horizontal division represents.

  • Question 10/10
    1 / -0.33

    Which among the following is the dual of Boolean expression X+YZ=(X+Y) (X+Z)?

    Solutions

    Correct Answer is: X.(Y+Z)=X.Y+X.Z

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