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- Question
In a polyatomic gas, the types of polarization which exist together are
Options- A. electronic and orientational
- B. electronic and ionic
- C. ionic and orientational
- D. electronic, orientational and ionic
- Correct Answer
- electronic, orientational and ionic
ExplanationAll the three types of polarization exist in polyatomic gases.
Materials and Components problems
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- 1. Electrical conductivity of metals expressed in ohm-1 m-1 is of the order of
Options- A. 1010
- B. 105
- C. 10-4
- D. 10-6 Discuss
Correct Answer: 105
Explanation:
Conductivity is reciprocal of resistivity. Since resistivity of metals is around 10-7 ohm-m, conductivity is about 107 ohm-1 m-1. So 105 is the nearest value.- 2. When a ferromagnetic substance is magnetised there are small changes in dimensions. This phenomenon is called
Options- A. hysteresis
- B. magnetostriction
- C. diamagnetism
- D. dipolar relaxation Discuss
Correct Answer: magnetostriction
- 3. In a metal the probability of a state 0.1 eV below Fermi level being occupied
Options- A. is more than the probability of state 0.1 eV above Fermi level being occupied
- B. is the same as the probability of state 0.1 eV above Fermi level being occupied
- C. is less than the probability of state 0.1 eV above Fermi level being occupied
- D. may be equal to or more or less than the probability of state 0.1 eV above Fermi level being occupied Discuss
Correct Answer: is more than the probability of state 0.1 eV above Fermi level being occupied
- 4. The iron core of a coil is removed so that it becomes an air cored coil. Its inductance will
Options- A. increase
- B. decrease
- C. remain the same
- D. may increase or decrease Discuss
Correct Answer: decrease
Explanation:
Because magnetic flux will decrease.- 5. At T = 0, the resistivity of a perfect single crystal of a metal is
Options- A. 0
- B. low
- C. high
- D. finite Discuss
Correct Answer: 0
Explanation:
At absolute zero temperature resistivity of metals is zero.- 6. In elemental dielectrics, the orientation and ionic polarization are absent.
Options- A. True
- B. False Discuss
Correct Answer: True
- 7. An electron in a homogeneous magnetic field and having velocity perpendicular to the direction of field moves
Options- A. perpendicular to the field
- B. along the field
- C. along a straight line inclined at 45° to field
- D. in a circular path Discuss
Correct Answer: in a circular path
- 8. An homogeneous dielectric material is subjected to an electric field E. If a small cavity is made inside the material, the electric field intensity inside and outside the cavity are different.
Options- A. True
- B. False Discuss
Correct Answer: False
Explanation:
The electric field intensity inside and outside the cavity are equal.- 9. A particle of charge Q coulombs is bound elastically to an equilibrium position with a force constant of f newton per metre. The polarizability of the system is
Options- A.
- B.
- C.
- D. Qf Discuss
Correct Answer:
- 10. In an hydrogen atom, an electron moves in the field of a proton. The stability of orbit requires equilibrium between coulomb's force and centrifugal force.
Options- A. True
- B. False Discuss
Correct Answer: True
Explanation:
Orbit is stable only if the two forces are equal and opposite.
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