The cathode rays carry ?

D. Both positive and negative charge

The property that decides the order of elements in the modern periodic table is ?

A. The number of protons (atomic number) in the nucleus

B. The number of neutrons in the nucleus

C. The atomic mass of the element

D. The number of electrons in the outermost shell

Everyday Science · Atoms, Elements & Compounds · page 4 of 30

Atoms MCQs with Answers

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Atoms MCQs (31–40)

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Past paper MCQs in this chapter · See all past papers

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31.
The cathode rays carry ?
Correct Answer: A. Negative charge
One-liner
Cathode rays carry a negative charge because they are streams of electrons emitted from the cathode in a discharge tube.
32.
Which subatomic particle has a negative charge?
Correct Answer: C. Electron
One-liner
The subatomic particle with a negative charge is the electron.
33.
Which of the following is expected to be the most paramagnetic? ⁶C, ³Li, ⁴Be, ⁵B
Correct Answer: A. ⁶C (Carbon)
One-liner
⁶C (Carbon) is expected to be the most paramagnetic because it has the maximum number of unpaired electrons (two) in its electronic configuration among the given options.
34.
Which of the following has the least electron affinity value?
Correct Answer: C. Nitrogen
One-liner
Nitrogen has the least electron affinity among the given options because of its stable half-filled 2p³ electronic configuration.
35.
If nucleon number of potassium is 39, number of neutrons will be _?
Correct Answer: B. 20
One-liner
The number of neutrons will be 20.
36.
The property that decides the order of elements in the modern periodic table is ?
Correct Answer: A. The number of protons (atomic number) in the nucleus
One-liner
The modern periodic table arranges elements in order of increasing atomic number (number of protons in the nucleus).
37.
The atom formed by the beta decay of carbon-14 is _?
Correct Answer: A. Nitrogen-14
One-liner
The atom formed by the beta decay of carbon-14 is Nitrogen-14.
38.
Which subatomic particle has a positive charge?
Correct Answer: B. Proton
One-liner
The subatomic particle with a positive charge is the Proton.
39.
An atom has atomic number 16 and mass number 32, the number of protons is?
Correct Answer: B. 16
One-liner
The number of protons in an atom is equal to its atomic number, so an atom with atomic number 16 has 16 protons.
40.
Consider isotope 92U^237 of uranium. The number of neutrons in it is?
Correct Answer: B. 145
One-liner
The number of neutrons in the isotope 92U^237 is 145.

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Atoms MCQs (31–40)

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