CTET Solved Paper - UPTET October 2017 Paper2
112. Mica is used in cooking utensils because it is
- Option : A
- Explanation : (A) Mica is used in cooking utensils because it is a good conductor of heat but bad conductor of electricity.
113. The angle of dip at magnetic pole of earth is
- Option : C
- Explanation : (C) The angle between the total earth magnetic field and surface of the earth is known as angle of dip.
Magnetic field of the magnetic pole of the earth is vertical. Thus angle (dip) made by total magnetic field φ with the surface of the earth is 900 •
- Option : B
- Explanation : (B) One compression and one rarefaction constitutes one wave. The length between the compression and rarefaction is called wavelength.
Here 20 compressions and 20 rarefactions shall from 20 waves. These are have length of 20 waves.
So, 20 x λ = 10 m = 1000 cm
∴ Wavelength, λ = 50 cm
be respectively the absolute refractive indices of water and glass, then the refractive index of glass relative to water is
