Materials and Components

High thermal conductivity and high melting point ✘ Low thermal conductivity and low melting pointL ✘ High thermal conductivity and low melting point ✘ Low thermal conductivity and high melting point ✔

Covalent bonding ✘ Recombination ✘ Thermal energy ✘ Free electrons ✔

Answer: Option B ✘ Ferrimagnetic materials have anti parallel orientation of equal moments of permanent dipoles. ✘ 1 ✘

Are not shared ✘ Are shared only between neighbouring atoms ✘ Are shared by all atoms ✘ Either B or C ✔

Answer: Option C ✘ Wood is a diamagnetic material. ✘ 1 ✘

2 ✘ 9 ✘ 11 ✘ 29 ✔

Increase in metals as well as in intrinsic semiconductor ✘ Increase in metals but decrease in intrinsic semiconductor ✘ Decrease in metals but increase in intrinsic semiconductor ✘ Decrease in metals as well as in intrinsic semiconductor ✔

Answer: Option C ✘ If the number of atoms per unit volume of a monoatomic gas changes, the dielectric constant still remains constant. ✘ 1 ✘

Good conductors at room temperature ✘ Ferromagnetic at room temperature ✘ Relatively poor conductors at room temperature ✘ Insulators at room temperature ✔

4 ✘ 8 ✘ 12 ✘ 14 ✔