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1. least distance of distinct vision for a normal eye is (a) infinity   (b) 2.5 cm            (c) 205 cm               (d) 25 Cm 2. A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power (a) +0.5 D           (b) -0.5 D     (c) +0.2 D               (d) NONE OF THESE 3. The splitting of white light into different colours on passing through a prism is called (a) reflection         (b) refraction       (c) dispersion      (d)NONE OF THESE 4. At noon, the Sun appears white as (a) blue colour is scattered the most  ...

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1. What is meant by a substance? Solution: It is a pure single form of matter. A substance has definite properties and compositions. Example – Iron 2. List the points of differences between homogeneous and heterogeneous mixtures. Solution: Homogeneous mixture Heterogeneous mixture Particles are uniformly distributed throughout the mixture All the particles are completely mixed and can be distinguished with the bare eyes or under a microscope. Has a uniform composition Irregular composition No apparent boundaries of division Noticeable boundaries of division. Exercise-2.2 Page: 18 1. Differentiate between homogenous and heterogeneous mixtures with examples. Solution: The following are the differences between heterogeneous and homogenous mixtures. Heterogeneous mixture Homogeneous mixture All the particles are completely mixed and can be distinguished with the bare eyes or under a microscope. Particles are uniformly distributed throughout the mixture Irregular composition Has a uniform c...