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Which one of the following statements is not true about nuclear energy generation in a nuclear reactor? 1 (A) Energy is obtained by a process called nuclear fission. (B) The nucleus of Uranium is bombarded with high energy neutrons. (C) A chain reaction is set in the process. (D) In this process a tremendous amount of energy is released at a controlled rate.

(B) The nucleus of Uranium is bombarded with high energy neutrons. Explanation The nucleus of Uranium is bombarded with low-energy... View Article

Isotopes are (i) Atoms of an element with similar chemical properties but different atomic masses. (ii) Atoms of different elements with similar chemical properties but different atomic masses. (iii) Atoms of an element with different chemical properties but same atomic masses. (iv) Atoms of different elements with different chemical properties but same atomic masses.

b) Atoms of same elements, having the same atomic number but different mass numbers. Explanation Isotopes of an element possess... View Article

Rishi went to a palmist to show his palm. The palmist used a special lens for this purpose. (i) State the nature of the lens and reason for its use. (ii) Where should the palmist place/hold the lens so as to have a real and magnified image of an object? (iii) If the focal length of this lens is 10 cm and the lens is held at a distance of 5 cm from the palm, use lens formula to find the position and size of the image.

(i) The nature of the lens will be convex lens and the reason for its use is, it gives a magnified... View Article