The near point and far point of a person are 40 cm and 250 cm, respectively.
The near point and far point of a person are 40 cm and 250 cm, respectively. Determine the power of…
8 years ago
Questions
The angle of incidence for a ray of light at a refracting surface of a prism is 45⁰.
The angle of incidence for a ray of light at a refracting surface of a prism is 45⁰. The angle…
8 years ago
A astronomical telescope has objective and eye-piece of focal lengths
A astronomical telescope has objective and eye-piece of focal lengths 40 cm, 4 cm, respectively. To view an object 200…
8 years ago
A person can see clearly objects only when they lie between 50 cm and 400 cm from
A person can see clearly objects only when they lie between 50 cm and 400 cm from his eyes. In…
8 years ago
The frequency of a light wave in a material is 2 x 10¹⁴ Hz and wavelength is 5000Å.
The frequency of a light wave in a material is 2 x 10¹⁴ Hz and wavelength is 5000Å. The refractive…
8 years ago
Fish die in water bodies polluted by sewage due to
Fish die in water bodies polluted by sewage due to Options (a) pathogens (b) Clogging of gills (c) Decreases in…
8 years ago
Surface water contains
Surface water contains Options (a) salt + organic matter (b) only salt (c) organic matter (d) suspended impurity Correct Answer:…
8 years ago
Addition of phosphate fertilizers into water leads to
Addition of phosphate fertilizers into water leads to Options (a) increased growth of decomposers (b) reduced algal growth (c) increased…
8 years ago
Atmosphere of big/metropolitan cities is polluted most by
Atmosphere of big/metropolitan cities is polluted most by Options (a) automobile exhausts (b) pesticide residue (c) household waste (d) radioactive…
8 years ago
The basic component of photochemical smog is
The basic component of photochemical smog is Options (a) PBN (b) PAN (c) SO₂ (d) all of these Correct Answer:…
8 years ago