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826. The chief ingredient of the mosquito repellent cream is derived from
A. Lemon
B. Tulsi
C. Neem
D. Rice bran
Explanation:
827. The colour of the sky looks blue because
A. sky is made up of blue colour particles.
B. blue colour is of longer wavelength.
C. blue colour is more prominent is sunlight.
D. blue colour of light is of shorter wavelength, so these waves are easily scattered by dust particles and water vapour.
Explanation:
828. Which of the following is a correct description of tissue culture ?
A. Conservation of forests and plantation
B. Growth and propagantion of horticultural crops
C. Science of cultivating animal tissue in artificial medium
D. Protection of wild animals
Explanation:
829. Oil rises up the wick in a lamp because
A. oil is very light
B. of the diffusion of oil through the wick
C. oil is volatile
D. of the capillary action phenomenon
Explanation:
830. Which of the following causes the rusting of iron ? 1. Oxidation2. Reduction3. Chemical reaction with oxygen 4. Chemical reaction with carbon dioxide
A. 1 and 2
B. 2 and 3
C. 3 and 4
D. 1 and 3
Explanation:
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