MCQOPTIONS
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MCQOPTIONS
This section includes 25 Mcqs, each offering curated multiple-choice questions to sharpen your Science knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
All samples of pure water contain hydrogen and oxygen in the mass ratio of\[1:8\].To which of the following laws does the above statement is in agreement? |
| A. | Law of conservation of mass |
| B. | Law of constant proportion |
| C. | Pivot joint |
| D. | Law of definite proportion |
| Answer» C. Pivot joint | |
| 2. |
Calculate the weight in grams present in \[0.7\] moles of sodium. |
| A. | \[16.1\,\,g\] |
| B. | \[16.2\,\,g\] |
| C. | Flightless |
| D. | \[0.161\,\,g\] |
| Answer» B. \[16.2\,\,g\] | |
| 3. |
What weight of calcium contains the same number of atoms as those in \[3\text{ }g\] of carbon? |
| A. | \[10\,\,g\] |
| B. | \[20\,\,g\] |
| C. | Flamingo |
| D. | \[40\,\,g\] |
| Answer» B. \[20\,\,g\] | |
| 4. |
The isotopes contain the same number of____ and different number of______. |
| A. | Neutrons, Protons |
| B. | Electrons, Protons |
| C. | tail feathers with the breast bone |
| D. | Neutrons, Protons |
| E. | None of these |
| Answer» D. Neutrons, Protons | |
| 5. |
Number of atoms present in \[5g\] of \[NaN{{O}_{3}}\]is: |
| A. | \[1.8\times {{10}^{24}}\] atoms |
| B. | 3.54 atoms |
| C. | 1-B 2-C 3-A 4-D |
| D. | \[1.54\times {{10}^{23}}\] atoms |
| E. | None of these |
| Answer» D. \[1.54\times {{10}^{23}}\] atoms | |
| 6. |
Calculate the mass of \[{{H}_{2}}{{O}_{2}}\] contained in \[0.4\] mole of\[{{H}_{2}}{{O}_{2}}\]. |
| A. | 18.2 g |
| B. | 13.6 g |
| C. | Crow |
| D. | 18.4. |
| E. | None of these |
| Answer» C. Crow | |
| 7. |
How many grams of sodium oxalate are to be weighed to get 0.1 mole of sodium oxalate\[(N{{a}_{2}}{{C}_{2}}{{O}_{4}})\]? |
| A. | \[13.4\,\,g\] |
| B. | \[1.34\,\,g\] |
| C. | Beak and legs |
| D. | \[0.134\,\,g\] |
| Answer» B. \[1.34\,\,g\] | |
| 8. |
The percentage of sulphur in sulphuric acid is : |
| A. | 40% |
| B. | 0.326 |
| C. | Eagle |
| D. | 0.35 |
| E. | None of these |
| Answer» C. Eagle | |
| 9. |
The term ?mole? in chemistry was introduced by who of the following. |
| A. | Lavosier |
| B. | Wilhelm Ostwald |
| C. | Beak and legs |
| D. | Neil Bohr |
| E. | None of these |
| Answer» C. Beak and legs | |
| 10. |
Number of atoms in 69 g of Na is : |
| A. | \[1.0\times {{10}^{24}}\] atoms of Na |
| B. | \[1.80\times {{10}^{24}}\] atoms of Na |
| C. | 1 and 3 only |
| D. | \[1.5\times {{10}^{23}}\] atoms of Na |
| E. | None of these |
| Answer» C. 1 and 3 only | |
| 11. |
Calculate the number of sulphur molecules in a 300 g sample of sulphur \[[{{S}_{8}}].\] |
| A. | \[7.7\times {{10}^{20}}\,molecules\] |
| B. | \[7.05\times {{10}^{23}}\,molecules\] |
| C. | A-2 B-3 C-1 D-4 |
| D. | \[6.023\times {{10}^{23}}\,molecules\] |
| E. | None of these |
| Answer» C. A-2 B-3 C-1 D-4 | |
| 12. |
Molar mass of \[{{C}_{2}}{{H}_{4}}\] is: |
| A. | \[26\,g\,mo{{l}^{-1}}\] |
| B. | \[28\,g\,mo{{l}^{-1}}\] |
| C. | fly high |
| D. | \[32\,g\,mo{{l}^{-1}}\] |
| E. | None of these |
| Answer» C. fly high | |
| 13. |
The number of electrons present in M shell of chlorine is: |
| A. | 8 |
| B. | 7 |
| C. | A bird that makes her nest using stones and pebbles on ground |
| D. | 18 |
| E. | None of these |
| Answer» C. A bird that makes her nest using stones and pebbles on ground | |
| 14. |
A molecular formula is a short form representation of\['X'\]. Identify \['X'\] from the following. |
| A. | A compound |
| B. | An element |
| C. | d e f g Nectar Flesh Muddy water with insects Seeds |
| D. | An alloy |
| Answer» B. An element | |
| 15. |
Which one of the following was not explained in Rutherford's nuclear model of atom? |
| A. | An atom consists of tiny positively charged nucleus surrounded by negatively charged electrons. |
| B. | Stability of an atom. |
| C. | |
| D. | The number of electrons and protons are equal in an atom. |
| E. | None of these |
| Answer» C. | |
| 16. |
16 g of water is equal to ____ moles. |
| A. | 1.2 |
| B. | 1.9 mol |
| C. | Ashok, Beena, Shuchi and Siddhi only |
| D. | 8.8 mol |
| E. | None of these |
| Answer» D. 8.8 mol | |
| 17. |
Cathode rays are: |
| A. | Negatively charged |
| B. | Positively charged |
| C. | It makes the beak strong and is used for cracking seeds. |
| D. | All above |
| E. | None of these |
| Answer» B. Positively charged | |
| 18. |
Sulphate of divalent metal M exists in hydrated form. If 0.10 mol of metal sulphate combines with 9.0 g of water to form the hydrated salt then, the formula of metal sulphate will be |
| A. | \[\text{MS}{{\text{O}}_{\text{4}}}\text{.}{{\text{H}}_{\text{2}}}\text{O}\] |
| B. | \[{{\text{M}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}}\text{.2}{{\text{H}}_{\text{2}}}\text{O}\] |
| C. | birds do not take care of their young ones |
| D. | \[\text{MS}{{\text{O}}_{\text{4}}}\text{.5}{{\text{H}}_{\text{2}}}\text{O}\] |
| Answer» E. | |
| 19. |
Calculate the number of moles of helium present in\[6.46\,\,g\]. (The atomic weight of helium is\[4\,\,a.m.u.\]). |
| A. | \[16.15\] moles |
| B. | \[1.615\] moles |
| C. | Ground |
| D. | \[0.1615\] moles |
| Answer» C. Ground | |
| 20. |
Direction: Observe the given flow chart and answer the following question.What are c and d? |
| A. | c = multiply by \[{{\text{N}}_{\text{A}}}\], d = divide by \[{{\text{N}}_{\text{A}}}\] |
| B. | c = multiply by \[{{\text{N}}_{\text{A}}}\], d = multiply by \[{{\text{N}}_{\text{A}}}\] |
| C. | Partridge |
| D. | c = divide by \[{{\text{N}}_{\text{A}}}\], d = divide by \[{{\text{N}}_{\text{A}}}\] |
| Answer» D. c = divide by \[{{\text{N}}_{\text{A}}}\], d = divide by \[{{\text{N}}_{\text{A}}}\] | |
| 21. |
Which of the following represents the correct number of moles of each element in 40 g of ferric sulphate? [Atomic mass of Fe = 56 u, S = 32 u, 0 = 16 u] |
| A. | Fe S 0 2 3 12 |
| B. | Fe S 0 1 1 4 |
| C. | swimming bird |
| D. | Fe S 0 0.1 0.1 0.4 |
| Answer» D. Fe S 0 0.1 0.1 0.4 | |
| 22. |
Calculate the number of atoms present in \[6.4\,\,g\] of sulphur. |
| A. | \[2.4\times {{10}^{-23}}\]atoms |
| B. | \[2.4\times {{10}^{-23}}\]atoms |
| C. | On snowy mountains |
| D. | \[1.2\times {{10}^{-23}}\]atoms |
| Answer» D. \[1.2\times {{10}^{-23}}\]atoms | |
| 23. |
Which one of the following fundamental particles is negatively charged? |
| A. | Electron |
| B. | Proton |
| C. | a duck has broad and flat beak with strainers |
| D. | All the above |
| E. | None of these |
| Answer» B. Proton | |
| 24. |
Select the relation between atomic number, mass number and number of neutrons. |
| A. | Mass number = atomic number + number of neutrons |
| B. | Mass number = atomic number/number of neutrons |
| C. | long, slender and curved beak |
| D. | Mass number = atomic number - number of neutrons |
| E. | None of these |
| Answer» B. Mass number = atomic number/number of neutrons | |
| 25. |
Which of the following shells can hold maximum number of electrons? |
| A. | M |
| B. | N |
| C. | 1-B, 2-A, 3-D, 4-C |
| D. | K |
| E. | None of these |
| Answer» C. 1-B, 2-A, 3-D, 4-C | |