MCQOPTIONS
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MCQOPTIONS
This section includes 1489 Mcqs, each offering curated multiple-choice questions to sharpen your 8th Class knowledge and support exam preparation. Choose a topic below to get started.
| 451. |
Which one of the following will be flattened on beating with a hammer? |
| A. | Coal |
| B. | Sulphur |
| C. | Zinc |
| D. | Iodine |
| E. | None of these |
| Answer» D. Iodine | |
| 452. |
Nylon is used to make ropes because: |
| A. | It is wrinkle resistant. |
| B. | It is easy to wash. |
| C. | It is lustrous in appearance. |
| D. | It is very strong. |
| E. | None of these |
| Answer» E. None of these | |
| 453. |
Natural polymer present in wood pulp is: |
| A. | Rayon |
| B. | Cellulose |
| C. | Chlorophyll |
| D. | Silk |
| E. | None of these |
| Answer» C. Chlorophyll | |
| 454. |
_____ is used as a substitute for glass for making windows in aeroplanes. |
| A. | Melamine |
| B. | PVC |
| C. | Perspex |
| D. | Polyethene |
| E. | None of these |
| Answer» D. Polyethene | |
| 455. |
Viscose is formed by dissolving: |
| A. | Wood pulp into a solution of hydrochloric acid. |
| B. | Wood pulp into sodium hydroxide solution. |
| C. | Wood pulp into sulphuric acid solution. |
| D. | Polyester into sodium hydroxide solution. |
| E. | None of these |
| Answer» C. Wood pulp into sulphuric acid solution. | |
| 456. |
Identify the metal that does NOT react with \[HCl\] |
| A. | Ag |
| B. | Mg |
| C. | M |
| D. | Fe |
| Answer» B. Mg | |
| 457. |
Which of the following non-metals exists in liquid state at room temperature? |
| A. | Chlorine |
| B. | Nitrogen |
| C. | Bromine |
| D. | Hydrogen |
| Answer» D. Hydrogen | |
| 458. |
Which of the following are the properties of non-metals? (i) They have low densities (ii) They have low melting points (iii) They are poor conductors of electricity |
| A. | Only (i) and (ii) |
| B. | Only (ii) and (iii) |
| C. | Only (i) and (iii) |
| D. | (i), (ii) and (iii) |
| Answer» E. | |
| 459. |
Aluminium foil is used for wrapping food. On which property is it used? |
| A. | Density |
| B. | Malleability |
| C. | Ductility |
| D. | Strength |
| Answer» C. Ductility | |
| 460. |
Identify the non-metal which exhibits yellow colour. |
| A. | Silicon |
| B. | Phosphorus |
| C. | sulphur |
| D. | Carbon |
| Answer» D. Carbon | |
| 461. |
Identify the metal that replaces magnesium from its salt. |
| A. | Ca |
| B. | \[Al\] |
| C. | Zn |
| D. | Fe |
| Answer» B. \[Al\] | |
| 462. |
Which of the following metals does NOT produce hydrogen gas when added to acid? |
| A. | Potassium |
| B. | Gold |
| C. | Zinc |
| D. | Magnesium |
| Answer» C. Zinc | |
| 463. |
Which of the following statements is NOT true of sodium and potassium? |
| A. | Both are metals. |
| B. | Both are hard. |
| C. | Both are solids at room temperature. |
| D. | Both react with oxygen to form oxides. |
| Answer» C. Both are solids at room temperature. | |
| 464. |
Which of the following is a chemical displacement reaction? |
| A. | \[2Al+F{{e}_{2}}{{O}_{3}}\xrightarrow[{}]{heat}A{{l}_{2}}{{O}_{3}}+2Fe+Heat\] |
| B. | \[2Na+C{{l}_{2}}\to 2\,NaCl\] |
| C. | \[{{P}_{2}}{{O}_{5}}+3{{H}_{2}}O\xrightarrow{{}}2{{H}_{3}}P{{O}_{4}}\] |
| D. | \[2\,PbS+3{{O}_{2}}\xrightarrow[{}]{heat}PbO+3S{{O}_{2}}\] |
| Answer» B. \[2Na+C{{l}_{2}}\to 2\,NaCl\] | |
| 465. |
To which category do antimony and arsenic belong? |
| A. | Metals |
| B. | Metalloids |
| C. | Non-metals |
| D. | Minerals |
| Answer» C. Non-metals | |
| 466. |
Study the reaction given below. \[X+YS{{O}_{4}}\to Y+XS{{O}_{4}}\] What are X and T? |
| A. | \[Al,Mg\] |
| B. | \[Zn,Cu\] |
| C. | \[Ag,K\] |
| D. | \[H,Al\] |
| Answer» C. \[Ag,K\] | |
| 467. |
Which of the following statements is true of the given chemical reactions? \[ZnO+C\to Zn+CO\] \[2F{{e}_{3}}{{O}_{3}}+3C\to 6Fe+3C{{O}_{2}}\] |
| A. | Carbon is reduced. |
| B. | Carbon is oxidized. |
| C. | Metal oxide is reduced to metal. |
| D. | Metal oxide is oxidized. |
| Answer» D. Metal oxide is oxidized. | |
| 468. |
When a little aluminium powder is added to dilute sulphuric acid, the produces(s) formed in the reaction is |
| A. | sulphur dioxide. |
| B. | aluminium sulphate. |
| C. | hydrogen. |
| D. | Both (B) and (C) |
| Answer» E. | |
| 469. |
Arrange the given metals in the descending order of their reactivity. |
| A. | Aluminium, copper, potassium |
| B. | Sodium, iron, copper |
| C. | Silver, zinc, calcium |
| D. | Magnesium, copper, sodium |
| Answer» C. Silver, zinc, calcium | |
| 470. |
Which of the following metals in their molten state cause galvanization of an iron article? |
| A. | Zinc |
| B. | Copper |
| C. | Carbon |
| D. | Gold |
| Answer» B. Copper | |
| 471. |
Which of the following substances will prevent corrosion of metals? |
| A. | Nitrogen |
| B. | Hydrogen |
| C. | Oxygen |
| D. | Carbon |
| Answer» B. Hydrogen | |
| 472. |
Which of the following is NOT a heavy metal? |
| A. | Cd |
| B. | Hg |
| C. | Pb |
| D. | K |
| Answer» E. | |
| 473. |
Why is tungsten used as a filament in electric bulbs? |
| A. | It is sonorous. |
| B. | It is metallic. |
| C. | It has a high melting point. |
| D. | It has high density. |
| Answer» D. It has high density. | |
| 474. |
How many electrons are present in non- metals in their outermost shell? |
| A. | 1, 2 or 3 |
| B. | 8, 9 or 10 |
| C. | 10, 20 or 30 |
| D. | 4, 5, 6 or 7 |
| Answer» E. | |
| 475. |
Which of the following is called a noble metal? |
| A. | Mercury |
| B. | Gold |
| C. | Lithium |
| D. | Caesium |
| Answer» C. Lithium | |
| 476. |
Which non-metal is used in the treatment of rubber during the process of vulcani-sation? |
| A. | Sulphur |
| B. | Phosphorus |
| C. | arbon |
| D. | Chlorine |
| Answer» B. Phosphorus | |
| 477. |
Which material is used for making crucibles? |
| A. | Sulphur |
| B. | Silicon |
| C. | Graphite |
| D. | Phosphorus |
| Answer» D. Phosphorus | |
| 478. |
Which of the following compounds is used to make photographic films? |
| A. | Sodium chloride |
| B. | Silver bromide |
| C. | Potassium iodide |
| D. | Copper chloride |
| Answer» C. Potassium iodide | |
| 479. |
Which of the following dissolves in water to form sulphuric acid? |
| A. | Sulphur dioxide |
| B. | Sulphur |
| C. | Sulphur trioxide |
| D. | Copper sulphate |
| Answer» D. Copper sulphate | |
| 480. |
Phosphorus combines with oxygen to form oxides. How many types of oxides are formed by it? |
| A. | One |
| B. | Two |
| C. | Three |
| D. | Four |
| Answer» C. Three | |
| 481. |
Identify the oxide of a non-metal which is neutral. |
| A. | \[S{{O}_{2}}\] |
| B. | \[N{{O}_{2}}\] |
| C. | \[{{P}_{2}}{{O}_{3}}\] |
| D. | \[CO\] |
| Answer» E. | |
| 482. |
When non-metals combine with oxygen, what do they produce? |
| A. | Acidic oxides |
| B. | Basic oxides |
| C. | Amphoteric oxides |
| D. | Salts |
| Answer» B. Basic oxides | |
| 483. |
Which metal reacts vigorously with\[HCl\]to produce salt and hydrogen? |
| A. | Na |
| B. | Zn |
| C. | Sn |
| D. | Pb |
| Answer» B. Zn | |
| 484. |
How many electrons are generally present in metals in their valence shell? |
| A. | 1, 2 or 3 |
| B. | 7, 8 or 9 |
| C. | 10, 11 or 12 |
| D. | 20, 30 or 40 |
| Answer» B. 7, 8 or 9 | |
| 485. |
A When the angle between two plane mirrors is \[60{}^\circ \], how many images will be formed by the mirrors? |
| A. | 5 |
| B. | 6 |
| C. | 7 |
| D. | 8 |
| Answer» B. 6 | |
| 486. |
Which of the following is used by E.N.T. doctors? |
| A. | Convex mirror |
| B. | Convex lens |
| C. | Plane mirror |
| D. | Concave mirror |
| Answer» E. | |
| 487. |
The diagram shows a ray of light reflected at a plane mirror.Which pair of the angle of incidence and angle of reflection is correct? |
| A. | Angle of IncidenceAngle of reflection\[\text{30 }\!\!{}^\circ\!\!\text{ }\]\[\text{30 }\!\!{}^\circ\!\!\text{ }\] |
| B. | Angle of IncidenceAngle of reflection\[\text{30 }\!\!{}^\circ\!\!\text{ }\]\[\text{60 }\!\!{}^\circ\!\!\text{ }\] |
| C. | Angle of IncidenceAngle of reflection\[\text{60 }\!\!{}^\circ\!\!\text{ }\]\[\text{30 }\!\!{}^\circ\!\!\text{ }\] |
| D. | Angle of IncidenceAngle of reflection\[\text{60 }\!\!{}^\circ\!\!\text{ }\]\[\text{60 }\!\!{}^\circ\!\!\text{ }\] |
| Answer» B. Angle of IncidenceAngle of reflection\[\text{30 }\!\!{}^\circ\!\!\text{ }\]\[\text{60 }\!\!{}^\circ\!\!\text{ }\] | |
| 488. |
If the angle of incidence is \[{{80}^{o}},\] what will be the angle of reflection? |
| A. | \[{{80}^{\text{o}}}\] |
| B. | \[{{100}^{\text{o}}}\] |
| C. | \[{{160}^{\text{o}}}\] |
| D. | \[{{20}^{\text{o}}}\] |
| Answer» B. \[{{100}^{\text{o}}}\] | |
| 489. |
A prism splits up light into different colours but a glass slab does not show dispersion because |
| A. | The emergent ray is deviated from the direction of the incident ray by the angle of deviation |
| B. | The incident and emergent rays are parallel to each other |
| C. | The emergent ray is laterally displaced from glass slab and changes its direction |
| D. | The incident and emergent rays are not parallel to each other |
| Answer» C. The emergent ray is laterally displaced from glass slab and changes its direction | |
| 490. |
Which of the following ray diagrams shown below shows respectively the short sightedness condition and its correctness by using a lens? |
| A. | (a) and (d) |
| B. | (a) and (c) |
| C. | (b) and (d) |
| D. | (b) and (c) |
| Answer» D. (b) and (c) | |
| 491. |
What is the perpendicular drawn at any point on a mirror called? |
| A. | Incident ray |
| B. | Reflected ray |
| C. | Normal |
| D. | Image |
| Answer» D. Image | |
| 492. |
What is the phenomenon of light bouncing back into the same medium called? |
| A. | Reflection |
| B. | Refraction |
| C. | Dispersion |
| D. | Splitting |
| Answer» B. Refraction | |
| 493. |
According to the laws of reflection, which of the following statements is correct? |
| A. | The angle of incidence is greater than the angle of reflection. |
| B. | The angle of incidence is less than the angle of reflection. |
| C. | The angle of incidence is equal to the angle of reflection. |
| D. | The angle of incidence is not equal to the angle of reflection. |
| Answer» D. The angle of incidence is not equal to the angle of reflection. | |
| 494. |
Which of the following occurs in persons suffering from myopia? |
| A. | The eye ball is shortened. |
| B. | Ciliary muscles contract. |
| C. | The eye ball elongates. |
| D. | The retina expands. |
| Answer» D. The retina expands. | |
| 495. |
Identify the nature of the image formed by the eye lens of a human eye. |
| A. | Real, upright and enlarged |
| B. | Real, upright and diminished |
| C. | Real, inverted and diminished |
| D. | Virtual, inverted and diminished |
| Answer» D. Virtual, inverted and diminished | |
| 496. |
Identify the part of the human eye on which different images are formed. |
| A. | Iris |
| B. | Pupil |
| C. | Cornea |
| D. | Retina |
| Answer» E. | |
| 497. |
For a normal eye, in an adult, what is the least distance of distinct vision? |
| A. | 5 to 8 cm |
| B. | 10 to 15 cm |
| C. | 20 to 25 cm |
| D. | 30 to 35 cm |
| Answer» D. 30 to 35 cm | |
| 498. |
Which of the following prevents internal reflections of light inside the human eye? |
| A. | Iris |
| B. | Pupil |
| C. | Choroid |
| D. | Blind spot |
| Answer» D. Blind spot | |
| 499. |
What makes objects visible? |
| A. | The absorption of light by objects |
| B. | The reflected light from the object |
| C. | The total internal reflection taking place in an object |
| D. | The refracted light from the object |
| Answer» C. The total internal reflection taking place in an object | |
| 500. |
A series of fast moving still pictures can create an illusion of movement. Why? |
| A. | The eye can focus on very rapidly changing pictures. |
| B. | The eye is quicker than the brain. |
| C. | The eye can separate two images only when the interval of separation between them is one-sixteenth of a second. |
| D. | The optical cortex can see through the rapidly moving images. |
| Answer» D. The optical cortex can see through the rapidly moving images. | |