The near point and far point of a person are 40 cm and 250 cm, respectively. Determine the power of the lens he/she should use while reading a book kept at distance 25 cm from […]
The angle of incidence for a ray of light at a refracting surface of a prism is 45⁰. The angle of prism is 60⁰. If the ray suffers minimum deviation through the prism, then the […]
A astronomical telescope has objective and eye-piece of focal lengths 40 cm, 4 cm, respectively. To view an object 200 cm away from the objective, the lenses must be seperated by a distance
Options […]
A person can see clearly objects only when they lie between 50 cm and 400 cm from his eyes. In order to increase the maximum distance of distinct vision to infinity, the type and power […]
The frequency of a light wave in a material is 2 x 10¹⁴ Hz and wavelength is 5000Å. The refractive index of material will be
Options
(a) 1.5 (b) 3 (c) 1.33 (d) […]
Fish die in water bodies polluted by sewage due to
Options
(a) pathogens (b) Clogging of gills (c) Decreases in D.O (d) Foul smell
Correct Answer:
Decreases in D.O
Explanation:
Microorganisms from sewage consume […]
Surface water contains
Options
(a) salt + organic matter (b) only salt (c) organic matter (d) suspended impurity
Correct Answer:
salt + organic matter
Explanation:
Surface water contains salt and organic matter.
Addition of phosphate fertilizers into water leads to
Options
(a) increased growth of decomposers (b) reduced algal growth (c) increased algal growth (d) nutrient enrichment(eutrophication)
Correct Answer:
nutrient enrichment(eutrophication)
Explanation:
No explanation available. […]
Atmosphere of big/metropolitan cities is polluted most by
Options
(a) automobile exhausts (b) pesticide residue (c) household waste (d) radioactive fall out
Correct Answer:
automobile exhausts
Explanation:
Atmosphere of big cities is polluted most […]
The basic component of photochemical smog is
Options
(a) PBN (b) PAN (c) SO₂ (d) all of these
Correct Answer:
PAN
Explanation:
No explanation available. Be the first to write the explanation for […]
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