The nucleon number and the proton number of a neutral atom of an element are 238 and 92 respectively. What is the number of neutrons in the atom?
A. 330 B. 238 C. 146 D. 119 E. 73 Correct Answer: Option C – 146 Explanation 238 – 92 = 146
In 24 days a radioactive isotope decreases in mass from 64g to 2g. What is the half life of the radioactive material
A. 0.75 days B. 2.58 days C. 4 days D. 4.80 days E. 6 days Correct Answer: Option D – 4.80 days Explanation 64g → 32g → 16g → 8g → 4g → 2g Half life time= 24/5 = 4.8 days
When an atom loses or gains a charge, it becomes an?
A. ion B. an electron C. a neutron D. a proton E. a deuteron Correct Answer: Option A – an electron
Which of the following substances is not an insulator?
A. Aluminium B. Glass C. Plastic D. Clay E. Cork Correct Answer: Option A – Aluminium
A car fuse is marked 15A and operates normally on a 12V battery. Calculate the resistance of the fuse wire
A. 180Ω B. 27Ω C. 3Ω D. 1.3Ω E. 0.8Ω Correct Answer: Option E – 0.8Ω Explanation R = V/I=12/15 = 0.8ΩProducts
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