Which of the following methods is most suitable for ore concentration if the ore is soluble in some suitable solvent? [A] Hydraulic Washing [B] Magnetic Separation [C] Froath floatation [D] Leaching
Adv.
Leaching
Which of the following refining methods works on the principle that impurities are more soluble in the melt than in the solid state of the metal? [A] Liquation [B] Electrolytic refining [C] Zone refining [D] Vapour Phase refining
What is the total number of allowed orbitals in a shell, if principal quantum number is n? [A] n [B] 2n [C] n2 [D] n3
What can be the maximum number of electrons in a shell, if principal quantum number is n? [A] n [B] n2 [C] 2n2 [D] 3n3
Which of the following quantum number determines the number of sub-shells? [A] Electron spin quantum number [B] Principal quantum number [C] Magnetic quantum number [D] Azimuthal quantum number
What do we call an ideal body which emits and absorbs all frequencies? [A] Black body [B] White body [C] Red body [D] Zero body
Which of these species are isoelectronic? [A] Al+ , B– [B] Mg+ , Cu– [C] Na+ , Al– [D] Na+ , F–
Which of the following are the limitations of Bohr’s model of atom? [A] it cannot explain spectrum of atoms containing more than one electron [B] it cannot explain the Zeeman effect [C] it cannot explain the Stark effect [D] All of the above
What is the general Q-value for alpha-decay? [A] greater than 0 [B] less than 0 [C] equal to 0 [D] None of the above
When is the gamma ray emitted? [A] When a nucleus in a ground state goes to the excited state [B] When a nucleus in an excited state spontaneously decays to its ground state [C] When alpha rays and beta rays collide [D] None of the above
Which of the following is correct about the principal quantum number? [A] It determines the size of the orbital [B] It can have positive integer values [C] It identifies the shell [D] All of the above
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