Which one of the following is not a radioactive element ...? Mcqs

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Which one of the following is not a radioactive element ...?

(A) Cadmium
(B) Thorium

(C) Radium
(D) Uranium

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A powder contains 100mg of a radioactive material that emits α-particles. (See in detail)...?

(A) 0mg
(B) 25mg

(C) 50mg
(D) 75mg

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A radioactive element emits a particle from the nucleus of one of its atoms. The particle comprises two protons and two neutrons. The name of this process is called...?

(A) α-emission
(B) β-emission

(C) γ-emission
(D) Nuclear fission

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The half life of a radioactive element is 8-days. How long it take to reduce it from 10 mg to 5 mg...?

(A) 4 days
(B) 12 days

(C) 16 days
(D) 8 days

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Which is the most electro-negative element among the following _________...?

(A) Fluorine
(B) Bromine

(C) Sodium
(D) Oxygen

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Which of the following is a positively charged particle emitted by a radioactive element...?

(A) Beta Rays
(B) Alpha Rays

(C) Gamma Rays
(D) None of these

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A radioactive nuclide emits a β-particle. The atomic number (proton number) of the nucleus number of ______...?

(A) Stays the same
(B) Decreases by 2

(C) Increases by 1
(D) Decreases by 4

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