Q. The hysteresis phenomenon in ferromagnetic materials exists at all temperatures.

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Q. Assertion (A): Magnetic susceptibility of diamagnetic materials is much less than that of paramagnetic materials.
Reason (R): For diamagnetic as well as paramagnetic materials, μᵣ is nearly equal to 1.

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Q. The conductivity of intrinsic semiconductor is given by

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Q. The core of a coil has a length of 10 cm. The self inductance is 8 mH. If the core length is doubled, all other quantities remaining the same, the self inductance will be

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Q. The minority carrier life time and diffusion constant in a semiconducting material are 100 μs and 100 cm²/s respectively. The diffusion length of carriers is

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Q. Assertion (A): Electronic and Ionic polarization in a polyatomic gas are independent of temperature.
Reason (R): The orientation polarization is independent of temperature.

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Q. Two materials having temperature coefficients of 0.004 and 0.0004 respectively are joined in series. The overall temperature coefficient is likely to be

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Q. Diamond is a paramagnetic material.

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Q. Which capacitor-store higher amount of energy?

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Q. Above ferroelectric curie temperature, spontaneous polarization in ferroelectric materials becomes stronger.

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Q. In paramagnetic materials

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Q. Assertion (A): Atomic number of sodium is 11.
Reason (R): Sodium has a body centred cubic lattice.

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Q. The number of valence electrons in pentavalent impurity is

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Q. If the diameter of a wire is doubled, its current carrying capacity becomes

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Q. The law J = σE, where J is current density, σ is electrical conductivity and E is field strength is

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Q. Assertion (A): Silicon is less sensitive to changes in temperature than germanium.
Reason (R): Cut in voltage in silicon is less than that in germanium.

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Q. Material which lack permanent magnetic dipoles are known as

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Q. The attraction between the nucleus and valence electron of copper atom is

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Q. If the temperature of an extrinsic semiconductor is increased so that the intrinsic carrier concentration is doubled, then

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Q. There is no hysteresis phenomenon is any dielectric material.

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