MCQOPTIONS
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MCQOPTIONS
This section includes 6820 Mcqs, each offering curated multiple-choice questions to sharpen your Science knowledge and support exam preparation. Choose a topic below to get started.
| 1901. |
The most reactive metal is? |
| A. | Such as |
| B. | copper |
| C. | lithium |
| D. | silver |
| Answer» D. silver | |
| 1902. |
What is the common name for nucleon? |
| A. | electron and proton |
| B. | protons and neutrons |
| C. | electron and neutron |
| D. | none of these |
| Answer» C. electron and neutron | |
| 1903. |
What is the effective radius of the atom? |
| A. | 10⁻⁶ m |
| B. | 10⁻¹⁰ m |
| C. | 10⁻¹⁴ m |
| D. | 10⁻¹⁵ m |
| Answer» C. 10⁻¹⁴ m | |
| 1904. |
The number of neutrons and protons in the nucleus of Ra²⁶⁶ are respectively? |
| A. | 138 and 88 |
| B. | 88 and 138 |
| C. | 226 and 88 |
| D. | 88 and 226 |
| Answer» B. 88 and 138 | |
| 1905. |
Who discovered the charge of electron? |
| A. | rutherford |
| B. | thomson |
| C. | chadwick |
| D. | Milicon |
| Answer» E. | |
| 1906. |
What is a positron? |
| A. | electron |
| B. | proton |
| C. | neutron |
| D. | mason |
| Answer» B. proton | |
| 1907. |
What is the perimeter of charge on an electron? |
| A. | - 1602x10⁻¹⁹c |
| B. | +16x10⁻¹⁹c |
| C. | - 16x10¹⁹c |
| D. | +16x10¹⁹c |
| Answer» B. +16x10⁻¹⁹c | |
| 1908. |
Is the electronic configuration stable in the second orbit of an atom of an element? |
| A. | 8 |
| B. | 32 |
| C. | 18 |
| D. | 2 |
| Answer» B. 32 | |
| 1909. |
If an atom of an element has 2 protons, two neutrons and 2 electrons, then what will be the mass number of that element? |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» C. 6 | |
| 1910. |
Which fundamental particle was discovered by Rutherford in physics? |
| A. | electron |
| B. | proton |
| C. | neutron |
| D. | mason |
| Answer» C. neutron | |
| 1911. |
What is the size of the nucleus of an atom? |
| A. | 10⁻⁵m |
| B. | 10⁻⁹m |
| C. | 10⁻¹⁰m |
| D. | 10⁻¹⁵m |
| Answer» E. | |
| 1912. |
The atomic number of an element is 35 and it has 18 electrons, then the number of protons will be? |
| A. | 17 |
| B. | 18 |
| C. | 35 |
| D. | 15 |
| Answer» D. 15 | |
| 1913. |
Which of the following electronic configuration is stable? |
| A. | d² |
| B. | p² |
| C. | s² |
| D. | f² |
| Answer» D. f² | |
| 1914. |
Which of the following electronic configuration is for a metallic element? |
| A. | 2 , 8 |
| B. | 2 , 8 , 7 |
| C. | 2 , 8 , 8 |
| D. | 2 , 8 , 8 , 2 |
| Answer» E. | |
| 1915. |
An atom has 9 electrons, 9 protons and 10 neutrons. What will be its mass number? |
| A. | 9 |
| B. | 10 |
| C. | 18 |
| D. | 19 |
| Answer» E. | |
| 1916. |
Which of the following electronic configuration is there for chlorine? |
| A. | 2 , 7 |
| B. | 2 , 8 , 7 |
| C. | 2 , 8 , 8 |
| D. | 2 , 8 , 8 , 2 |
| Answer» C. 2 , 8 , 8 | |
| 1917. |
What is the relation of magnetic quantum number with respect to the molecule of a chemical element? |
| A. | by orientation |
| B. | by frequency |
| C. | by size |
| D. | by rotation |
| Answer» E. | |
| 1918. |
13. What is the electronic structure of 127? |
| A. | 2 , 8 , 2 , 1 |
| B. | 2 , 8 , 3 |
| C. | 2 , 8 , 1 , 2 |
| D. | 3 , 8 , 2 |
| Answer» C. 2 , 8 , 1 , 2 | |
| 1919. |
What will be the number of neutrons in ₉₂U? |
| A. | 146 |
| B. | 234 |
| C. | 90 |
| D. | 138 |
| Answer» B. 234 | |
| 1920. |
The electronic configuration of 1s², 2s 2P⁶ is |
| A. | Na and Ne |
| B. | Ne and Na⁺ |
| C. | Ne and F |
| D. | Na and F |
| Answer» C. Ne and F | |
| 1921. |
Which of the following properties would be different for electrically neutral atoms of two isotopes of the same element? |
| A. | atomic number |
| B. | atomic mass |
| C. | number of protons |
| D. | number of electrons |
| Answer» C. number of protons | |
| 1922. |
The electronic configuration of an atom is 2, 8, 2. What is the number of valence electrons in it? |
| A. | 10 |
| B. | 12 |
| C. | 8 |
| D. | 2 |
| Answer» E. | |
| 1923. |
In the nucleus of a chlorine atom of atomic number - 17 and mass number - 35 is? |
| A. | 18 protons |
| B. | 18 neutrons |
| C. | 35 protons |
| D. | 35 neutrons |
| Answer» C. 35 protons | |
| 1924. |
The difference between an atomic mass and mass number is called? |
| A. | Atomic number |
| B. | atomic number |
| C. | mass loss |
| D. | number of electrons |
| Answer» D. number of electrons | |
| 1925. |
What are the components of atomic nucleus? |
| A. | electron and proton |
| B. | protons and neutrons |
| C. | electron and neutron |
| D. | electrons, protons and neutrons |
| Answer» C. electron and neutron | |
| 1926. |
Are atoms electric? |
| A. | in a positive way |
| B. | negatively |
| C. | biphasically |
| D. | indifferently |
| Answer» E. | |
| 1927. |
Is it a positron? |
| A. | positively charged electron |
| B. | the nucleus of a proton and a neutron |
| C. | nucleus of two protons charged |
| D. | helium |
| Answer» B. the nucleus of a proton and a neutron | |
| 1928. |
Who is the discoverer of neutrinos? |
| A. | anderson |
| B. | Paulie |
| C. | Yukawa |
| D. | goldstein |
| Answer» C. Yukawa | |
| 1929. |
Who among the following propounded the atomic theory? |
| A. | Benjamin Franklin |
| B. | madam curie |
| C. | Albert Einstein |
| D. | John Dalton |
| Answer» E. | |
| 1930. |
The quantum number that specifies the direction of orientation in space in an orbit is |
| A. | Key quantum number |
| B. | Orbital quantum number |
| C. | Magnetic quantum number |
| D. | Quantitative quantum number |
| Answer» D. Quantitative quantum number | |
| 1931. |
What happens when two electrons are in the same orbital? |
| A. | same spin |
| B. | reverse spin |
| C. | same or opposite rotation |
| D. | no spin |
| Answer» C. same or opposite rotation | |
| 1932. |
If the number of orbitals was denoted by d, then the maximum number of electrons in an orbital would be? |
| A. | n |
| B. | n² |
| C. | 2n² |
| D. | 2n³ |
| Answer» D. 2n³ | |
| 1933. |
o two electrons in an atom have the same four quantum numbersis it? |
| A. | hund's rule |
| B. | Pauli's Exclusion Principle |
| C. | avogadro's law |
| D. | Heisenberg's Uncertainty Principle |
| Answer» C. avogadro's law | |
| 1934. |
Can the nature of elements be known? |
| A. | by electronic configuration |
| B. | By atomic number |
| C. | by atomic mass |
| D. | by atomic weight |
| Answer» B. By atomic number | |
| 1935. |
What is the number of neutrons in the bipositive zinc ion whose mass number is 70? |
| A. | 34 |
| B. | 40 |
| C. | 38 |
| D. | 36 |
| Answer» C. 38 | |
| 1936. |
No two electrons in an atom can have the same four quantum numbers. This law is related to which of the following scientists? |
| A. | Hund |
| B. | Paulie |
| C. | faraday |
| D. | rhenius |
| Answer» C. faraday | |
| 1937. |
The ratio of the radii of two nuclei is 1 : 2. What will be the ratio of their mass numbers? |
| A. | 0.0472222222222222 |
| B. | 0.0444444444444444 |
| C. | 0.0458333333333333 |
| D. | 0.05 |
| Answer» B. 0.0444444444444444 | |
| 1938. |
The atomic number of sodium is 11 and the atomic mass is 23. The number of electrons, neutrons and protons in it will be respectively? |
| A. | 11 , 11 , 12 |
| B. | 12 , 11 , 12 |
| C. | 12 , 12 , 11 |
| D. | 11 , 12 , 11 |
| Answer» E. | |
| 1939. |
What is needed for the process of nuclear fusion in the Sun? |
| A. | low temperature and high pressure |
| B. | very high temperature and very high pressure |
| C. | high temperature and low pressure |
| D. | very high temperature and no pressure |
| Answer» C. high temperature and low pressure | |
| 1940. |
What is the oxidation number of the central S atom of Na₂S₂O?? |
| A. | 2 |
| B. | 0 . 2 |
| C. | 6 |
| D. | 4 |
| Answer» C. 6 | |
| 1941. |
Which of the following is a nuclear donor impurity? |
| A. | Al |
| B. | B |
| C. | Ga |
| D. | P |
| Answer» E. | |
| 1942. |
Which of the following is the maximum number of electrons that can be present in the m shell? |
| A. | 2 |
| B. | 8 |
| C. | 18 |
| D. | 32 |
| Answer» D. 32 | |
| 1943. |
A piece of paper and a coin, both of equal mass, are dropped from the 10th floor of a building. A piece of paper will take longer to reach the ground, because . . . |
| A. | Gravitational force is less on paper than on coin |
| B. | The buoyant force is greater on a piece of paper than on a coin |
| C. | The buoyant force on the coin is high and it acts in a downward direction. |
| D. | A piece of paper travels a longer path to reach the ground surface. |
| Answer» C. The buoyant force on the coin is high and it acts in a downward direction. | |
| 1944. |
When graphite is heated by an electric arc in the presence of an inert gas, it is obtained? |
| A. | Diamond |
| B. | Cetyl Tri Methyl Ammonium Bromite |
| C. | fullerene |
| D. | water gas |
| Answer» D. water gas | |
| 1945. |
What is in the nucleus of helium? |
| A. | only one proton |
| B. | two protons |
| C. | two protons and two neutrons |
| D. | one proton and two neutrons |
| Answer» D. one proton and two neutrons | |
| 1946. |
What is the correct order of electronegativity of atoms C, N, O and F? |
| A. | Cu003eNu003eOu003eF |
| B. | Nu003eCu003eOu003eF |
| C. | Fu003eOu003eNu003eC |
| D. | Cu003eNu003eFu003eO |
| Answer» D. Cu003eNu003eFu003eO | |
| 1947. |
How many neutrons are there in a U atom? |
| A. | 92 |
| B. | 238 |
| C. | 146 |
| D. | 330 |
| Answer» D. 330 | |
| 1948. |
An electron and a proton are moving in circular paths of equal radius with the same speed. If the mass of the proton is about 2000 times that of the mass, then which one of the following will occur? |
| A. | The centripetal force required for the electron would be about 2000 times greater than the centripetal force required for the proton. |
| B. | The centripetal force required for the proton will be about 2000 times greater than the centripetal force required for the electron. |
| C. | No centripetal force is necessary for a charged particle |
| D. | The same centripetal force will be acting on both the particles because they are rotating in the same circular path. |
| Answer» C. No centripetal force is necessary for a charged particle | |
| 1949. |
How many meters are in one angstrom? |
| A. | 10⁻¹⁰m |
| B. | 10²m |
| C. | 10¹⁰m |
| D. | 10⁷m |
| Answer» B. 10²m | |
| 1950. |
How many meters are there in a micron? |
| A. | 10⁻⁴ |
| B. | 10⁻⁶ |
| C. | 10⁴ |
| D. | 10⁶ |
| Answer» C. 10⁴ | |