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  • Question

  • A magnet does not attract


  • Options
  • A. nickel
  • B. iron
  • C. copper
  • D. iron and copper

  • Correct Answer
  • copper 

    Explanation
    Only copper is non-magnetic.

    Materials and Components problems

    Search Results

    • 1. The number of protons in germanium atom is

    • Options
    • A. 4
    • B. 16
    • C. 28
    • D. 32
      • Discuss
    • 2. Tesla is a unit of

    • Options
    • A. flux
    • B. field strength
    • C. flux density
    • D. MMF
      • Discuss
    • 3. The colour code on a carbon resistor is brown-black-red-gold. The value of resistance is

    • Options
    • A. 100 ?
    • B. 1000 ?
    • C. 1000 ? ± 5%
    • D. 1000 ? ± 10%
      • Discuss
    • 4. In the wave mechanical theory, the maximum of the charge distribution in the ground state occurs for a distance from the nucleus equal to

    • Options
    • A. first Bohr radius
    • B. second Bohr radius
    • C. third Bohr radius
    • D. either first or second Bohr radius
      • Discuss
    • 5. Assertion (A): Acceptor extrinsic semiconductor has higher conductivity than intrinsic semiconductor.

      Reason (R): Addition of p-type impurity produces an allowable discrete energy level just above valence band.


    • Options
    • A. Both A and R are true and R is correct explanation of A
    • B. Both A and R are true but R is not correct explanation of A
    • C. A is true but R is false
    • D. A is false but R is true
      • Discuss
    • 6. At 0 K, silicon and germanium behave like monoatomic crystals.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. Two coaxial metallic cylinders have radii R1 and R2. The space between them is filled with a dielectric having dielectric constant ?r. The capacitance per metre length is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 8. Hysteresis curve is associated with motion of domain walls.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. The induced magnetic dipole moment has a direction opposite to the applied magnetic field.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. A sample of N type semiconductor has an electron density of 6.25 x 1018/cm3 at 300 K. If intrinsic concentration of carriers in this sample is 2.5 x 1013/cm3 at this temperature, the hole density is

    • Options
    • A. 106 / cm3
    • B. 108 / cm3
    • C. 1010 / cm3
    • D. 1012 / cm3
      • Discuss

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