Gamma rays have the highest penetration power because they: MCQ with Answer and Explanation

Gamma rays have the highest penetration power because they:
A. Carry positive charge
B. Have no mass and no charge
C. Are slowest
D. Are heaviest
Answer: Option B
Solution (By JKSSB Mock Tests)
Gamma rays are electromagnetic waves with no rest mass and no charge, so they do not readily interact with matter via ionization compared to alpha and beta particles. They can penetrate deep into materials, requiring dense lead or thick concrete for shielding. Alpha and beta particles interact strongly via charge, losing energy quickly. Gamma rays are similar to X-rays but from nuclear origin.

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Practice More chemistry Questions

Question #1
The electrolyte used in copper refining is:
A. NaCl
B. KOH
C. AgNO₃
D. CuSO₄ + H₂SO₄

Correct Answer: Option D


Explanation:
In electrolytic refining of copper, the electrolyte is acidified copper sulfate solution (CuSO₄ acidified with H₂SO₄). The anode is impure copper, cathode is pure copper. Cu²⁺ ions from the electrolyte are reduced and deposited on the cathode, while copper from anode oxidizes and enters solution. Impurities settle as anode mud (containing Ag, Au).

This question belongs to: Science chemistry
Question #2
Who discovered the electron and determined its charge-to-mass ratio?
A. Niels Bohr
B. J. J. Thomson
C. James Chadwick
D. Ernest Rutherford

Correct Answer: Option B


Explanation:
J.J. Thomson discovered the electron through cathode ray tube experiments in 1897 and measured the e/m ratio by applying electric and magnetic fields. Rutherford discovered the nucleus via the gold foil experiment. Chadwick discovered the neutron (1932). Bohr proposed the planetary model of the atom with quantized orbits. Thomson's model (plum pudding) was later superseded. Exam memory: Thomson = electron (e/m); Rutherford = nucleus; Chadwick = neutron; Bohr = energy levels.

This question belongs to: Science chemistry
Question #3
An ion M³⁺ has 10 electrons and 14 neutrons. The atomic number and mass number of M are:
A. 13 and 27
B. 10 and 24
C. 13 and 24
D. 10 and 27

Correct Answer: Option A


Explanation:
The ion M³⁺ has lost 3 electrons, so the neutral atom M has 10 + 3 = 13 electrons. Thus, the atomic number is 13. The mass number is protons + neutrons = 13 + 14 = 27. The element is Aluminum, and the specific isotope is Aluminum-27.

This question belongs to: Science chemistry