1. What is the maximum limit of BOD of water approved by WHO?
A. 6 ppmB. 3 ppmC. 10 ppmD. 6.5 − 8.5 ppm
2. Which one is the correct order of electron affinity?
A. F > Cl > Br > IB. Cl > F > Br > IC. F > Cl > I > BrD. I > Br > Cl > F
3. What is the value of? 1 ω ω2 ω ω2 1 ω2 1 ω
A. ω4B. 1 + ω + ω2C. ω3D. 1 ω = 0 = 1 + ω + ω2 1 + ω + ω2 ω ω2 1 + ω + ω2 ω2 1 1 + ω + ω2 1 ω
4. Which preservative is used to preserve vegetable?
A. EDTAB. Sodium benzoateC. Sulfite saltD. Calcium propanoate
5. Rays of infrared region can be observed in which series of the atomic spectrum of H atom?
A. Paschen seriesB. Balmer seriesC. Lyman seriesD. All
6. sin 28∘ 32′sin 88∘ 32′ + sin 61∘ 28′sin 1∘ 28′ =?
A. √3 2B. 1 2C. 1D. √2 2