FirstRanker Logo

FirstRanker.com - FirstRanker's Choice is a hub of Question Papers & Study Materials for B-Tech, B.E, M-Tech, MCA, M.Sc, MBBS, BDS, MBA, B.Sc, Degree, B.Sc Nursing, B-Pharmacy, D-Pharmacy, MD, Medical, Dental, Engineering students. All services of FirstRanker.com are FREE

Get the MBBS Question Bank Android App

Access previous years' papers, solved question papers, notes, and more on the go!

Install From Play Store

Get the Nursing Question Bank Android App

Access 10+ years of Question Papers with answers, notes for B.Sc Nursing on the go!

Install From Play Store

q

Delhi University Entrance Test (DUET) 2020 Previous Year Question Paper With Answer Key

This post was last modified on 27 December 2020

Download Document
Download Document
DUET Last 10 Years 2011-2021 Question Papers With Answer Key || Delhi University Entrance Test conducted by the NTA


Topic:- ELEC MSC S2

  1. The equation of the plane through the points (1, -1,2), (1, 1, -2) and (-1, 1,2) is

    [Question ID = 1584]

    --- Content provided by‌ FirstRanker.com ---

    1. x + 3y + 2z - 2 = 0
    2. x - y + 2z - 2 = 0
    3. 2x + 2y + z - 2 = 0
    4. x + y - z - 2 = 0

    Correct Answer :-

    --- Content provided by‌ FirstRanker.com ---

    • 2x + 2y + z - 2 = 0

  2. Unit vector perpendicular to A = 3î + î + 2k and B = 2î – 2j + 4k vectors is

    [Question ID = 1585]

    1. ±(3î -j - k)/v14

      2. --- Content provided by‍ FirstRanker.com ---

    2. ±(î+j+k)/v3
    3. ±(î-j+k)/v3
    4. ±(î-j-k)/v3

    Correct Answer :-

    • ±(î-j-k)/v3

    --- Content provided by‍ FirstRanker.com ---

  3. The two complex numbers Z1 = 2 + i2/v3 and Z2 = v3 + i. The argument of Z1/Z2 in degree is

    [Question ID = 1586]

    1. 0°
    2. 90°

      3. --- Content provided by‌ FirstRanker.com ---

    3. 30°
    4. 60°

    Correct Answer :-

    • 0°

    4. --- Content provided by​ FirstRanker.com ---

  4. The value of the definite integral ? sin x dx from 0 to p/2 is

    [Question ID = 1587]

    1. 1
    2. 0
    3. p

      4. --- Content provided by​ FirstRanker.com ---

    4. -p

    Correct Answer :-

    • 0

  5. If we differentiate the f(x) = xx then df/dx

    --- Content provided by‍ FirstRanker.com ---

    [Question ID = 1588]

    1. 1 + logx
    2. -xx(1 + logx)
    3. xx(1 + logx)
    4. xx(logx)

      5. --- Content provided by‌ FirstRanker.com ---

    Correct Answer :-

    • xx(1 + logx)

  6. The absolute maximum and minimum values points of x3 - 6x2 + 9x - 7 in [0 5] are

    [Question ID = 1589]

    --- Content provided by FirstRanker.com ---

    1. the point of maxima is 3 and the point of minima is 5
    2. the point of maxima is 5 and the point of minima is 0
    3. the point of maxima is 5 and the point of minima is 3
    4. There is no maxima and minima points in [0 5]

    Correct Answer :-

    --- Content provided by⁠ FirstRanker.com ---

    • the point of maxima is 5 and the point of minima is 3

  7. The Laplace transform of given unit step function f(t-ß) = {0 t < ß, 1 t > ß} is

    [Question ID = 1590]

    1. e-2s/ß

      2. --- Content provided by​ FirstRanker.com ---

    2. e-ßs/s
    3. -e-2s/s
    4. e-2s

    Correct Answer :-

    • e-ßs/s

    --- Content provided by⁠ FirstRanker.com ---

  8. If 2 and 4 are the eigen values of square matrix A then the Eigen values of AT are

    [Question ID = 1591]

    1. 0.5, 0.25
    2. 2, 4

      3. --- Content provided by⁠ FirstRanker.com ---

    3. 4, 16
    4. 3, 2

    Correct Answer :-

    • 2, 4

    9. --- Content provided by​ FirstRanker.com ---

  9. The system of equation x - 2y + z = 0, 2x - y + 3z = 0 and ? x + y - z = 0 has non zero solution, if ? is

    [Question ID = 1592]

    1. ? = 0.4
    2. ? = -2
    3. ? = 2

      4. --- Content provided by​ FirstRanker.com ---

    4. ? = -0.8

    Correct Answer :-

    • ? = -0.8

  10. If A is skew-Hermitian, then (iA) is

    --- Content provided by FirstRanker.com ---

    [Question ID = 1593]

    1. Skew-symmetric
    2. Symmetric
    3. Hermitian
    4. Skew-Hermitian

      5. --- Content provided by⁠ FirstRanker.com ---

    Correct Answer :-

    • Hermitian

  11. The integrating factor of the differential equation dy/dx + y/x = x3 - 3 is

    [Question ID = 1594]

    --- Content provided by‌ FirstRanker.com ---

    1. 1/x
    2. x log x
    3. x
    4. log x

    Correct Answer :-

    --- Content provided by‍ FirstRanker.com ---

    • x

  12. The solution of dy/dx - y tan x = y2 sec x is given by:-

    [Question ID = 1595]

    1. y-1 = sinx + C1 cos x

      2. --- Content provided by​ FirstRanker.com ---

    2. y-1 = cosx + c3 sinx
    3. y-1 = - cosx + c1 sin x
    4. y-1 = -sinx + c2 cos x

    Correct Answer :-

    • y-1 = -sinx + c2 cos x

    --- Content provided by FirstRanker.com ---

  13. The family of conic represented by the solution of the differential equation (4x + 3y +1) dx + (3x+2y+1) dy = 0 is

    [Question ID = 1596]

    1. Parabolas
    2. Circle

      3. --- Content provided by⁠ FirstRanker.com ---

    3. Ellipses
    4. Hyperbola

    Correct Answer :-

    • Hyperbola

    14. --- Content provided by‌ FirstRanker.com ---

  14. The function f(x)= x3- 6x2 + 9x + 25

    [Question ID = 1597]

    1. maxima at x = 1 and a minima at x = 3
    2. a maxima at x = 3 and a minima at x = 1
    3. no maxima, but a minima at x = 1

      4. --- Content provided by​ FirstRanker.com ---

    4. a maxima at x = 1,but no minima

    Correct Answer :-

    • maxima at x = 1 and a minima at x = 3

  15. Consider an optical fiber of 75 µm diameter, core index n1 = 1.5, and cladding index n2 = 1.49 for operation at ? = 1.31 µm. How many modes does this fiber support?

    --- Content provided by FirstRanker.com ---

    [Question ID = 1598]

    1. 244
    2. 312
    3. 484
    4. 188

      5. --- Content provided by⁠ FirstRanker.com ---

    Correct Answer :-

    • 484

  16. When a LED has 2 V applied to its terminals, it draws 100 mA and produces 4 mW of optical power. The LED conversion efficiency from electrical to optical power is:-

    [Question ID = 1599]

    --- Content provided by‌ FirstRanker.com ---

    1. 3%
    2. 4%
    3. 5%
    4. 2%

    Correct Answer :-

    --- Content provided by FirstRanker.com ---

    • 2%

  17. Number of electron-hole pairs generated divided by the number of photons is:-

    [Question ID = 1600]

    1. Dark current

      2. --- Content provided by‌ FirstRanker.com ---

    2. Quantum response
    3. Photo sensitivity
    4. Quantum efficiency

    Correct Answer :-

    • Quantum efficiency

    --- Content provided by​ FirstRanker.com ---

  18. If the refractive index of a media is 1.5, the velocity of light in the medium is:-

    [Question ID = 1601]

    1. 3×108 m/s
    2. 1.5×108 m/s

      3. --- Content provided by FirstRanker.com ---

    3. 1×108 m/s
    4. 2×108 m/s

    Correct Answer :-

    • 2×108 m/s

    19. --- Content provided by​ FirstRanker.com ---

  19. In C language, what is the output of the following code

    int main()
    { int c; printf("%i",c);
    }

    [Question ID = 1602]

    --- Content provided by⁠ FirstRanker.com ---

    1. 1
    2. 0
    3. error
    4. 4

    Correct Answer :-

    --- Content provided by‌ FirstRanker.com ---

    • 0

  20. In C language, what is the output of the following code

    int main()
    { int i = 4; printf("%d%d",i,i++);
    --- Content provided by‍ FirstRanker.com ---
    }

    [Question ID = 1603]

    1. 54
    2. 45
    3. 44

      4. --- Content provided by‌ FirstRanker.com ---

    4. 55

    Correct Answer :-

    • 54

  21. In C language, what is the output of the following code

    --- Content provided by​ FirstRanker.com ---

    int main()
    { int a = 63, b = 9; printf("%d",a>>a/b-2);
    }

    [Question ID = 1604]

    1. 1

      2. --- Content provided by​ FirstRanker.com ---

    2. 2
    3. 3
    4. None of these

    Correct Answer :-

    • 1

    --- Content provided by⁠ FirstRanker.com ---

  22. main()
    { int x; x = 4; while (x > 1) { printf("%d",x); x=x-1; }
    }

    [Question ID = 1605]

    --- Content provided by‌ FirstRanker.com ---

    1. 4323
    2. 432
    3. 4321
    4. 3215

    Correct Answer :-

    --- Content provided by‌ FirstRanker.com ---

    • 432

  23. In C "switch" statement, each case instance value must be:-

    [Question ID = 1606]

    1. constant

      2. --- Content provided by‌ FirstRanker.com ---

    2. Variable
    3. Special symbol
    4. None of these

    Correct Answer :-

    • constant

    --- Content provided by‍ FirstRanker.com ---

  24. If mobility of an electrons in Si at 300 K is 0.16 m²/V.s then the diffusion coefficient of electrons is:-

    [Question ID = 1607]

    1. 20.7 x 10-4 m²/s
    2. 62.1 x 10-4 m²/s

      3. --- Content provided by‌ FirstRanker.com ---

    3. 6.4 x 10-2 m²/s
    4. 41.4 x 10-4 m²/s

    Correct Answer :-

    • 41.4 x 10-4 m²/s

    25. --- Content provided by FirstRanker.com ---

  25. If an electric field of 45 V/m is applied to a semiconductor sample whose Hall coefficient is 0.04 m³/C then the current density in the sample is (Given: µn = 0.36 m²/V)

    [Question ID = 1608]

    1. 203 A/cm²
    2. 814 A/m²
    3. 414 A/m²

      4. --- Content provided by FirstRanker.com ---

    4. 650 A/cm²

    Correct Answer :-

    • 414 A/m²

  26. Radiation recombination lifetime is 0.3 ns from a contact. If the minority carrier mobility is 8000 cm²/V.s at 300 K then the diffusion length for the electron is:-

    --- Content provided by⁠ FirstRanker.com ---

    [Question ID = 1609]

    1. 2.50 µm
    2. 1.25 µm
    3. 5.00 µm
    4. 7.98 µm

      5. --- Content provided by⁠ FirstRanker.com ---

    Correct Answer :-

    • 2.50 µm

  27. Consider a 10 µm diameter p-n junction fabricated in Si. If donor density is 1015 /cm³ and acceptor density is 1016 /cm³ then built in potential in the p-n junction is (Given: intrinsic carrier concentration for Si = 1.75 × 1010 /cm³)

    [Question ID = 1610]

    --- Content provided by‍ FirstRanker.com ---

    1. 0.31 V
    2. 1.12 V
    3. 1.42 V
    4. 0.63 V

    Correct Answer :-

    --- Content provided by‍ FirstRanker.com ---

    • 0.63 V

  28. In an n-type GaAs crystal at 300 K, the electron concentration varies as n(x) = 1.5 × 1015 exp(-x/L) /cm2. If the electron diffusion co-efficient is 250 cm2/s then the diffusion current density at x = 0 is (where L = 1.5µm and x > 0)

    [Question ID = 1611]

    1. 1.5 kA/cm²

      2. --- Content provided by FirstRanker.com ---

    2. 1.0 kA/cm²
    3. 10.0 kA/cm²
    4. 0.4 kA/cm²

    Correct Answer :-

    • 0.4 kA/cm²

    --- Content provided by⁠ FirstRanker.com ---

  29. In a MOSFET the transfer characteristics are used to determine which of the following device parameter?

    [Question ID = 1612]

    1. threshold voltage and output resistance
    2. threshold voltage and transconductance

      3. --- Content provided by‍ FirstRanker.com ---

    3. transconductance and output resistance
    4. transconductance and channel length modulation

    Correct Answer :-

    • threshold voltage and transconductance

    30. --- Content provided by FirstRanker.com ---

  30. The maximum voltage gain obtained from FET having gm = 5ms and rd = 20kO is

    [Question ID = 1613]

    1. 100
    2. 10
    3. 0

      4. --- Content provided by FirstRanker.com ---

    4. infinity

    Correct Answer :-

    • 100

  31. The drain of n-channel MOSFET is shorted to the gate and threshold voltage is 1.5V. If the drain current (ID) is 2 mA for VGS = 2.5 V then for VGS = 3.5 V the ID is

    --- Content provided by​ FirstRanker.com ---

    [Question ID = 1614]

    1. 2 mA
    2. 4 mA
    3. 8 mA
    4. 1 mA

      5. --- Content provided by⁠ FirstRanker.com ---

  32. If a BJT has base current 250 µA and emitter current collector current

    [Question ID = 1615]

    1. 14.75 µ? and 99
    2. 14.75 A and 59

      3. --- Content provided by FirstRanker.com ---

    3. 14.75 µ? and 99.8
    4. 14.75 mA and 59

    Correct Answer :-

    • 14.75 mA and 59

    33. --- Content provided by FirstRanker.com ---

  33. For the following Lissajous figure, the ratio of frequencies of signals applied to two inputs of CRO is

    This download link is referred from the post: DUET Last 10 Years 2011-2021 Question Papers With Answer Key || Delhi University Entrance Test conducted by the NTA

--- Content provided by⁠ FirstRanker.com ---

This post was last modified on 27 December 2020