Modern Physics - Study Mode

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[#96] Consider the statements. 1. Photon is a particle of light. 2. Mass of photon is not defined. 3. Speed of photon is as the speed of light. 4. Photons are charged. Which options is/are correct?

(A) 1 and 2

(B) 1, 2, 3 and 4

(C) 1, 2 and 3

(D) 1 and 3

Correct Answer

(C) 1, 2 and 3

[#97] Assertion (A) Amongst alpha, beta and gamma rays, α-particle has maximum penetrating power. Reason (R) The alpha particle is heavier than beta and gamma rays.

(A) Both A and R are true and R is the correct explanation of A

(B) Both A and R are true, but R is not the correct explanation of A

(C) A is true, but R is false

(D) A is false, but R is true

Correct Answer

(D) A is false, but R is true

[#98] An element has an atomic weight of W and an atomic number of N. The number of protons in the nucleous of its atom is

(A) N

(B) W

(C) W - N

(D) W + N

Correct Answer

(A) N

[#99] Consider the following statements. 1. The Nuclear Security Summits are periodically held under the aegis of the United Nations. 2. The International Panel on Fissile Materials is an organ of International Atomic Energy Agency. Which of the statements given above is/are correct?

(A) Only 1

(B) Only 2

(C) Both 1 and 2

(D) Neither 1 nor 2

Correct Answer

(D) Neither 1 nor 2

[#100] Name the India's oldest nuclear reactor which was recommissioned in 2018.

(A) Dhruva

(B) Bhaskar

(C) Apsara

(D) Dhanush

Correct Answer

(C) Apsara