Class Xi MCQ Test

30 Questions | Total Attempts: 45

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Class Xi MCQ Test

TIME ALLOTTED: 60 MINUTES NEGATIVE MARKING OF -1 MARKS FOR INCORRECT ANSWERS


Questions and Answers
  • 1. 
    Which orbital diagram does not obey Aufbau Principle? 
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 2. 
    The basis of three unpaired electrons present in the configuration of Nitrogen is
    • A. 

      Aufbau's principle

    • B. 

      Pauli's principle

    • C. 

      Hund's principle

    • D. 

      Uncertainty principle

  • 3. 
    An electron has kinetic energy 2.8×10-23 J De-broglie wavelength will be nearly? 
    • A. 

      9.8×10-24 

    • B. 

      9.8×10-7

    • C. 

      9.8×10-8

    • D. 

      9.8×10-10

  • 4. 
    The quantum numbers +1/2 and -1/2 for the electron spin represent? 
    • A. 

      Rotation of electron in clockwise and anticlockwise direction respectively. 

    • B. 

      Rotation of electron in anticlockwise and clockwise direction respectively. 

    • C. 

      Magnetic moment of the electron pointing up and down respectively

    • D. 

      Two quantum mechanical spin states which have no classical analogue. 

  • 5. 
    The number of electrons that can be accommodated in dz2 orbital is? 
    • A. 

      10

    • B. 

      4

    • C. 

      1

    • D. 

      2

  • 6. 
    Uncertainty in position of a 0.25 g particle is 10-5 m. Then uncertainty in its velocity will be? (h=6.6×10-34 Js) 
    • A. 

      1.2×1034

    • B. 

      2.1×10-26

    • C. 

      1.6×10-20

    • D. 

      1.7×10-9

  • 7. 
    Which of the following is correctly matched
    • A. 

      Isotopes 20Ca40 19K40

    • B. 

      Isotones Si30  P31  S32

    • C. 

      Isobars O16  O17  O18

    • D. 

      Isoelectronic N-3 O-2 CrCr+3

  • 8. 
    Angular momentum for P-shell electron-
    • A. 

      3h/π

    • B. 

      Zero

    • C. 

      √2h/2π

    • D. 

      None

  • 9. 
    In an electronic transition atom cannot emit
    • A. 

      Visible light

    • B. 

      Gamma rays

    • C. 

      Infra red light

    • D. 

      UV light

  • 10. 
    Heisenberg Uncertainty principle is not valid for
    • A. 

      Moving electron

    • B. 

      Motor car

    • C. 

      Stationary particles

    • D. 

      2 & 3 both

  • 11. 
    In an atom, for how many electrons, the quantum numbers will be, n=3, l=2 , m= +2 , s= +1/2
    • A. 

      18

    • B. 

      6

    • C. 

      24

    • D. 

      1

  • 12. 
    Electronic configuration given below has violated
    • A. 

      Hund's rule

    • B. 

      Paul's principle

    • C. 

      Aufbau's principle

    • D. 

      N+l rule

  • 13. 
    The atomic number of the element having maximum number of unpaired 3p electrons is (in ground state) 
    • A. 

      15

    • B. 

      10

    • C. 

      12

    • D. 

      8

  • 14. 
    Assertion- No teo electrons in an atom can have the same values of four quantum numbers.  Reason- No two electrons in an atom can be simultaneously in the same shell, same Subshell, same orbitals and have same spin.  Choose the answers appropriately.  A: If both Assertion and Reason are True and Reason is the correct explanation of Assertion. B : If both Assertion and Reason are True but Reason is the wrong explanation of Assertion. C : If Assertion is True but Reason is False. D : If both Assertion and Reason are False.​​​​​​
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 15. 
    Assertion- p- orbital has dumb bell shape.  Reason- Electrons present in p-orbital can have three values for 'm' - 0, +1 , -1 Choose the answers appropriately.  A: If both Assertion and Reason are True and Reason is the correct explanation of Assertion. B : If both Assertion and Reason are True but Reason is the wrong explanation of Assertion. C : If Assertion is True but Reason is False. D : If both Assertion and Reason are False.
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 16. 
    Assertion- The ground state configuration of Cr is 3d4s1 Reason- A set of exactly half filled orbitals containing parallel spin arrangement provide extra stability.  Choose the answers appropriately.  A: If both Assertion and Reason are True and Reason is the correct explanation of Assertion. B : If both Assertion and Reason are True but Reason is the wrong explanation of Assertion. C : If Assertion is True but Reason is False. D : If both Assertion and Reason are False. ​​
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 17. 
    Assertion- An orbital cannot have more than two electrons Reason-  The two electrons with opposite spin in an orbital create opposite magnetic field.  Choose the answers appropriately.  A: If both Assertion and Reason are True and Reason is the correct explanation of Assertion. B : If both Assertion and Reason are True but Reason is the wrong explanation of Assertion. C : If Assertion is True but Reason is False. D : If both Assertion and Reason are False.
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 18. 
    Assertion- The configuration of B atom cannotbe 1s2 2s3 Reason- Hund's rule demands that the configuration should display maximum multiplicity.  Choose the answers appropriately.  A: If both Assertion and Reason are True and Reason is the correct explanation of Assertion. B : If both Assertion and Reason are True but Reason is the wrong explanation of Assertion. C : If Assertion is True but Reason is False. D : If both Assertion and Reason are False.
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 19. 
    Assertion- In Rutherford's gold foil experiment, a very few alpha particles are deflected back.  Assertion- Nucleus present inside the atom is heavy.  ​​Choose the answers appropriately.  A: If both Assertion and Reason are True and Reason is the correct explanation of Assertion. B : If both Assertion and Reason are True but Reason is the wrong explanation of Assertion. C : If Assertion is True but Reason is False. D : If both Assertion and Reason are False.  
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 20. 
    The wavelength of spectral lines emitted is inversely proportional to? 
    • A. 

      Velocity

    • B. 

      Energy

    • C. 

      Quantum number

    • D. 

      Radius

  • 21. 
    Assertion- Bohr model fails in case of multielectron species.  Reason- It does not mention electron-electron interaction.  Choose the answers appropriately.  A: If both Assertion and Reason are True and Reason is the correct explanation of Assertion. B : If both Assertion and Reason are True but Reason is the wrong explanation of Assertion. C : If Assertion is True but Reason is False. D : If both Assertion and Reason are False.
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 22. 
    The wave number which corresponds to electromagnetic radiation of wavelength 500 nm is equal to 
    • A. 

      5×10-11 cm-1

    • B. 

      2×10cm-1

    • C. 

      5×10-5 cm-1

    • D. 

      2×10-9 sec-1

  • 23. 
    The De-broglie wavelength of an electron is 66 nm. The velocity of the electron is (h=6.6 × 10-34 kg ms​​​​​​-1 m=9.0 × 10-31 kg) 
    • A. 

      1.84 × 10-14 m s-1

    • B. 

      1.1 × 10m s-1

    • C. 

      5.4 × 103 m s-1

    • D. 

      1.1 × 103  m s-1

  • 24. 
    If the Planck's constant h= 6.6 × 10-34  ​​Js , de Broglie wavelength of a particle having momentum of 3.3× 10-24 kg m s-1 will be
    • A. 

      0.02 A°

    • B. 

      0.5 A°

    • C. 

      2 A°

    • D. 

      500 A°

  • 25. 
    The wavelength associated with a ball of mass 100g moving with a speed of 10cm/sec (h= 6.6 × 10-34 J/s) is:-
    • A. 

      6.6 × 1032 cm 

    • B. 

      6.6 × 1027 cm 

    • C. 

      6.6 × 10-27 cm 

    • D. 

      6.6 × 10-32 cm 

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