Practice Chemistry basic - general science mcq Online Quiz (set-2) For All Competitive Exams
Q-1) The chemical symbol for barium is
(a)
(b)
(c)
(d)
Q-2) An atom of carbon has 6 protons. Its mass number is 12. How many neutrons are present in an atom of carbon?
(a)
(b)
(c)
(d)
Q-3) An oxide of nitrogen has molecular weight 30. What is the number of electrons in one molecule of the compound?
(a)
(b)
(c)
(d)
Q-4) A group of atoms chemically bonded together is a (an)
(a)
(b)
(c)
(d)
In a molecule two or more than two atoms are convalently bonded with each other.
Q-5) What is the number of mole(s) of H2 (g) required to saturate one-mole benzene?
(a)
(b)
(c)
(d)
Q-6) Match List-I with List-II and select the correct answer using the code given below the lists.
List-I (Characteristic)
List-II (Particle)
A. Zero mass
1. Positron
B. Fractional charge
2. Neutrino
C. Fractional spin
3. Quark
D. Integral spin
4. Photon
| List-I (Characteristic) | List-II (Particle) |
| A. Zero mass | 1. Positron |
| B. Fractional charge | 2. Neutrino |
| C. Fractional spin | 3. Quark |
| D. Integral spin | 4. Photon |
(a)
(b)
(c)
(d)
Q-7) The nucleus of an atom contains
(a)
(b)
(c)
(d)
The nucleus contains protons and neutrons whereas electrons revolves around the nucleus in circular orbits.
Q-8) Match List-I with List-II and select the correct answer using the code given below the lists.
List-I (Scientist)
List-II (Discovery)
A. Goldstein
1. Atomic theory
B. Chadwick
2. Proton
C. JJ Thomson
3. Neutron
D. John Dalton
4. Electron
Code: A B C D
| List-I (Scientist) | List-II (Discovery) |
| A. Goldstein | 1. Atomic theory |
| B. Chadwick | 2. Proton |
| C. JJ Thomson | 3. Neutron |
| D. John Dalton | 4. Electron |
(a)
(b)
(c)
(d)
Q-9) Radioactivity was discovered by
(a)
(b)
(c)
(d)
Q-10) Which of the following is not a basic particle of an element?
(a)
(b)
(c)
(d)
Q-11) One gram of which of the following contains largest number of oxygen atoms?
(a)
(b)
(c)
(d)
The no. of atoms in O3 is maximum i.e., 3
Q-12) The number value 6.022 × 1023 is also called
(a)
(b)
(c)
(d)
Q-13) Which one among the following transitions of electron of hydrogen atom emits radiation of the shortest wavelength?
(a)
(b)
(c)
(d)
Q-14) Which one of the following pairs constitutes particle-antiparticle pair?
(a)
(b)
(c)
(d)
Q-15) Which of the following describes an isotope with a mass number of 99 that contains 56 neutrons in its nucleus ?
(a)
(b)
(c)
(d)
Given mass number (Z) = 99
No. of neutrons = 56
∴ No. of protons = atomic number = 99 – 56 = 43
i.e., $↖56↙43{Tc}$
Q-16) The number of molecules in one mole of a gas is
(a)
(b)
(c)
(d)
Q-17) In an atom valence electron are present in
(a)
(b)
(c)
(d)
Q-18) In an atom valence electron are present in
(a)
(b)
(c)
(d)
Q-19) What is the number of water molecules present in a tiny drop of water ( volume 0.0018 ml ) at room temperature?
(a)
(b)
(c)
(d)
Q-20) What is the weight of one atom of Hydrogen in grams?
(a)
(b)
(c)
(d)