Modern Physics - Study Mode

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[#201] Among the following radiations, which has the highest energy?

(A) Visible

(B) X-ray

(C) Ultra-violet

(D) Infra-red

Correct Answer

(B) X-ray

[#202] Which type of reaction produces the most harmful radiation?

(A) Fusion reaction

(B) Fission reaction

(C) Chemical reaction

(D) Photochemical reaction

Correct Answer

(B) Fission reaction

[#203] Which of the following statements are true? 1. All radioactive elements decay exponentially with time. 2. Half-life time of radioactive elements is the time required for one-half of the radioactive atoms to disintegrate. 3. Age of the earth can be determined by radioactive dating. 4. Half-life time of a radioactive element is fifty percent of its average life period. Select the correct answer:

(A) 1 and 3

(B) 1, 3 and 4

(C) 1, 2 and 3

(D) 2 and 3

Correct Answer

(C) 1, 2 and 3

[#204] The important nuclear fuel available in India in abundance is

(A) Uranium

(B) Thorium

(C) Iridium

(D) Plutonium

Correct Answer

(B) Thorium

[#205] Positive rays are very identical to

(A) α-particle rays

(B) β-rays

(C) γ-rays

(D) None of these

Correct Answer

(A) α-particle rays