Atomic Nucleus|. Practice MCQs Physics for Mdcat By Engr. Kamran Soomro | mosaicbro.com

Atomic Nucleus|. Practice MCQs Physics for Mdcat By Engr. Kamran Soomro

7 of 114 questions (Page 4 of 17)

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22 A particle having the mass of an electron and the charge of a proton is called a:
Correct Answer: B
Explanation: A positron has the mass of an electron but a positive charge.
23 The nucleus consists of:
Correct Answer: A
Explanation: The nucleus contains protons and neutrons; electrons orbit outside.
24 Mass of neutron is:
Correct Answer: B
Explanation: The mass of a neutron is approximately $1.67 \times 10^{-27}\text{kg}$.
25 Mass of protons is:
Correct Answer: A
Explanation: Protons have a mass of about $1.67 \times 10^{-27}\text{kg}$.
26 I amu is equal to:
Correct Answer: D
Explanation: 1 atomic mass unit (amu) equals $1.66 \times 10^{-27}\text{kg}$.
27 Atoms in an element whose atomic number are the same but have different mass number are called:
Correct Answer: C
Explanation: Isotopes have identical atomic numbers but different mass numbers.
28 The nuclei having the same mass number but different atomic number are called:
Correct Answer: B
Explanation: Isobars share the same mass number but differ in atomic number.
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