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MCQOPTIONS
This section includes 1777 Mcqs, each offering curated multiple-choice questions to sharpen your 9th Class knowledge and support exam preparation. Choose a topic below to get started.
| 601. |
A dispersed phase particle in a zig-zag movement is shown below. What kind of motion is exhibited by the particle? |
| A. | Transitional motion |
| B. | Circular motion |
| C. | Linear motion |
| D. | Brownian motion |
| Answer» E. | |
| 602. |
Soham, a class 9 student mixed some iron filings and sulphur in a China dish and heated them strongly to obtain a residue.Which of the following is not a characteristic property of the residue? |
| A. | It cannot be separated into sulphur and iron filings by normal physical methods. |
| B. | Its properties are completely different from iron and sulphur. |
| C. | Its composition is same throughout. |
| D. | Its appearance is different from iron and sulphur but it shows chemical properties of both iron and sulphur. |
| Answer» E. | |
| 603. |
In which of the following does scattering of light takes place? |
| A. | Electrolytic solutions |
| B. | Colloidal solutions |
| C. | Electro dialysis |
| D. | Alcoholic solutions |
| Answer» C. Electro dialysis | |
| 604. |
A student added \[10\,\,ml-12\,\,ml\] of Conc. \[{{H}_{2}}S{{O}_{4}}\]in a test tube containing \[5\,\,g-6\,\,g\] of sugar crystals and warmed it gently. He noticed that white crystals slowly turned brown and became a black mass. What happened in this change? |
| A. | \[{{H}_{2}}S{{O}_{4}}\] turned black but no change took place. |
| B. | Sugar got charred by the action of hot. conc. \[{{H}_{2}}S{{O}_{4}}\]and a chemical change took place. |
| C. | It is only a physical change. |
| D. | It is an irreversible physical change. |
| Answer» C. It is only a physical change. | |
| 605. |
Which of these statements is/are true? |
| A. | The components of a suspension can be separated by filtration. |
| B. | The particles of a colloid can pass through a filter paper. |
| C. | The constituents of a compound can be separated easily. |
| D. | Both [a] and [b] |
| Answer» E. | |
| 606. |
The size of a colloidal particle is |
| A. | \[{{10}^{-1}}\]to\[{{10}^{-3}}cm\] |
| B. | \[{{10}^{-5}}\]to\[{{10}^{-7}}cm\] |
| C. | \[{{10}^{-8}}\]to\[{{10}^{-5}}cm\] |
| D. | \[{{10}^{-6}}\]to\[{{10}^{-8}}cm\] |
| Answer» C. \[{{10}^{-8}}\]to\[{{10}^{-5}}cm\] | |
| 607. |
What is the smallest constituent of matter that retains its chemical identity? |
| A. | Atom |
| B. | Molecule |
| C. | Ion |
| D. | Radical |
| Answer» C. Ion | |
| 608. |
Identify a pure substance from the following? |
| A. | Steel |
| B. | Magnalium |
| C. | Ammonia |
| D. | Gun powder |
| Answer» D. Gun powder | |
| 609. |
Which of the following pairs of colloidal solutions have dispersed phase as liquid and dispersing medium as gas? |
| A. | Fog, mist |
| B. | Butter, milk |
| C. | Fog, smoke |
| D. | Smoke, foam |
| Answer» B. Butter, milk | |
| 610. |
Two substances \[P\] and \[Q\] when brought together, form substance \[R\] with the evolution of heat. The properties of \[R\] are different from both \[P\] and\[Q\]. What is substance\[R\]? |
| A. | A compound |
| B. | An element |
| C. | A metal |
| D. | A mixture |
| Answer» B. An element | |
| 611. |
What type of mixture is steel? |
| A. | Solid-liquid heterogeneous mixture |
| B. | Solid-solid heterogeneous mixture |
| C. | Solid-solid homogeneous mixture |
| D. | Pure substance |
| Answer» C. Solid-solid homogeneous mixture | |
| 612. |
The boiling points of a few gases found in air are given below: Element Krypton Neon Nitrogen Oxygen Boiling point \[\mathbf{({}^\circ C)}\] -152 -246 -196 -183 If liquid mixture is fractionally distilled, the order of gases distilling out is |
| A. | Krypton, Neon, Nitrogen, Oxygen |
| B. | Neon, Nitrogen, Oxygen, Krypton |
| C. | Nitrogen, Neon, Oxygen, Krypton |
| D. | Oxygen, Neon, Nitrogen, Krypton. |
| Answer» C. Nitrogen, Neon, Oxygen, Krypton | |
| 613. |
What kind of a colloidal solution is an emulsion? |
| A. | Solid dispersed in solid. |
| B. | Liquid dispersed in liquid. |
| C. | Gas dispersed in liquid. |
| D. | Liquid dispersed in solid. |
| Answer» C. Gas dispersed in liquid. | |
| 614. |
Both cooking oil and water are liquids at room temperature. By which of the given characteristics are they different chemically? |
| A. | Same colour and flammability |
| B. | Odour and in flammability |
| C. | Solubility and similar taste |
| D. | Odour and flammability |
| Answer» C. Solubility and similar taste | |
| 615. |
What kind of change is undergone when an electric bulb glows |
| A. | A physical change |
| B. | A chemical change |
| C. | Both a physical and a chemical change |
| D. | A permanent change |
| Answer» B. A chemical change | |
| 616. |
What is the technique used to separate dirt particles from clothes in a washing machine? |
| A. | Magnetic separation |
| B. | Filtration |
| C. | Evaporation |
| D. | Centrifugation |
| Answer» E. | |
| 617. |
Which of the following apparatus is used to separate a mixture of immiscible liquids? |
| A. | Centrifuge |
| B. | Condenser |
| C. | Separating funnel |
| D. | Distillation flask |
| Answer» D. Distillation flask | |
| 618. |
By which method can ammonium chloride be separated from sand? |
| A. | By hand picking |
| B. | By filtration |
| C. | By sublimation |
| D. | By diffusion |
| Answer» D. By diffusion | |
| 619. |
What is the process involved in making candy? |
| A. | Filtration |
| B. | Crystallisation |
| C. | Sedimentation |
| D. | Centrifugation |
| Answer» C. Sedimentation | |
| 620. |
Which of the following processes can be useful in separating the salt from a mixture of sand and salt? |
| A. | Dissolution |
| B. | Filtration |
| C. | Evaporation |
| D. | All of the above |
| Answer» E. | |
| 621. |
Which of the following processes is useful to collect pure water from a solution of sugar and water or salt and water? |
| A. | Filtration |
| B. | Evaporation |
| C. | Distillation |
| D. | Crystallisation |
| Answer» D. Crystallisation | |
| 622. |
Which of the following processes of separating substances involves both evaporation and condensation? |
| A. | Filtration |
| B. | Crystallisation |
| C. | Distillation |
| D. | Sedimentation |
| Answer» D. Sedimentation | |
| 623. |
Which of the following statements is/are incorrect? I Centrifugation method can be used to separate butter from cream. II Coloured component of blue ink can be separated by evaporation. III Chromatography can be used to detect drugs in blood. IV Camphor can be separated from salt by crystallisation. |
| A. | II only |
| B. | II and III only |
| C. | IV only |
| D. | II and IV only |
| Answer» D. II and IV only | |
| 624. |
Which of the following is a homogeneous solution? |
| A. | Muddy water |
| B. | Bread |
| C. | Concrete |
| D. | A solution of sugar in water |
| Answer» E. | |
| 625. |
How can sugar from sugar solution be separated? |
| A. | By distillation |
| B. | By evaporation |
| C. | By sublimation |
| D. | By filtration |
| Answer» C. By sublimation | |
| 626. |
By which process the drugs from the blood are separated? |
| A. | Distillation |
| B. | Chromatography |
| C. | Sublimation |
| D. | Separating funnel |
| Answer» C. Sublimation | |
| 627. |
Which of the following obey the law of constant proportions in their formation? |
| A. | Mixtures |
| B. | Compounds |
| C. | Elements |
| D. | Colloids |
| Answer» C. Elements | |
| 628. |
Which of the following is an example of a mixture? |
| A. | Sugar |
| B. | Brass |
| C. | \[C{{O}_{2}}\] |
| D. | \[N{{O}_{2}}\] |
| Answer» C. \[C{{O}_{2}}\] | |
| 629. |
What happens when salt dissolved in water is heated? |
| A. | There is an increase in the boiling point. |
| B. | There is no change in the boiling point. |
| C. | There is a decrease in the boiling point. |
| D. | All of the above |
| Answer» B. There is no change in the boiling point. | |
| 630. |
Which of the following is a characteristic of both mixtures and compounds? |
| A. | They contain components in fixed proportions. |
| B. | Their properties are the same as those of their components. |
| C. | Their weight is equal to the sum of the weights of their components. |
| D. | Energy is given out when they are being prepared. |
| Answer» D. Energy is given out when they are being prepared. | |
| 631. |
What is a solution of iodine in carbon tetrachloride called? |
| A. | Aqueous solution |
| B. | Alcoholic solution |
| C. | Non-aqueous solution |
| D. | Tincture of iodine |
| Answer» D. Tincture of iodine | |
| 632. |
Which of the following is a solid-in-solid colloid? |
| A. | Shaving cream |
| B. | Milk of magnesia |
| C. | Milky glass |
| D. | Cheese |
| Answer» D. Cheese | |
| 633. |
Which of the following statements about the given experimental set-up is/are incorrect? I. It is used to separate a mixture of two or more miscible liquids for which the difference in boiling points is more than 25 K. II. It is used for the separation of different gases from air. III. It is used to separate acetone and water from their mixture. IV. It is based on the principle of repeated cooling and condensation of vapours by providing surface for the vapours. |
| A. | I only |
| B. | III and IV only |
| C. | I and II only |
| D. | I and III only |
| Answer» E. | |
| 634. |
What are the materials which contain at least two pure substances and show the properties of their constituents called? |
| A. | A compound |
| B. | An element |
| C. | A mixture |
| D. | A solution |
| Answer» D. A solution | |
| 635. |
Nidhi took two China dishes and marked them as I and II. In China dish I, she mixed iron filings and sulphur powder. In China dish II, she mixed iron filings and dilute hydrochloric acid. What were her observations in both the dishes? |
| A. | In China dish I, a mixture is formed, where iron filings and sulphur powder can be seen separately. |
| B. | In China dish II, a new compound is formed, which is different from iron filings and dilute hydrochloric acid. |
| C. | A colourless and odourless gas comes out from China dish II. |
| D. | All the above observations are correct. |
| Answer» E. | |
| 636. |
A liquid and a solid are found together in a single phase. What is this known as? |
| A. | Solution |
| B. | Solute |
| C. | Solvent |
| D. | Emulsion |
| Answer» B. Solute | |
| 637. |
Study the given flow chart and choose the correct statements. (i) The property used to separate the mixture is solubility of different components in different solvents. (ii) Sulphur is soluble in carbon disulphide, salt in water and coal is insoluble in both. (iii) X is water and Y is carbon disulphide. |
| A. | (i) and (ii) only |
| B. | (ii) and (iii) only |
| C. | (i) and (iii) only |
| D. | All are correct. |
| Answer» E. | |
| 638. |
Which of the following is a true solution? |
| A. | \[NaCl\] in sulphur dioxide. |
| B. | Copper in silver. |
| C. | Salt in petrol. |
| D. | Mud in water. |
| Answer» C. Salt in petrol. | |
| 639. |
Match column I with column II and select the correct option from the codes given below. Column I Column II (a) Sublimation (i) Separation of water and \[\text{CC}{{\text{l}}_{4}}\] (b) Magnetic separation (ii) Separation of \[\text{NaCl}\] from \[\text{KN}{{\text{O}}_{3}}\] (c) Distillation (iii) Separation of benzene and aniline (d) Separating funnel (iv) Separation of iron and sand (e) Fractional Crystallisation (v) Separation of iodine and sand |
| A. | (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv), (e)-(v) |
| B. | (a)-(v), (b)-(iv), (c)-(iii), (d)-(i), (e)-(ii) |
| C. | (a)-(iv), (b)-(v), (c)-(ii), (d)-(i), (e)-(iii) |
| D. | (a)-(i), (b)-(ii), (c)-(iv), (d)-(v), (e)-(iii) |
| Answer» C. (a)-(iv), (b)-(v), (c)-(ii), (d)-(i), (e)-(iii) | |
| 640. |
What kind of solution is amalgam? |
| A. | Solid in solid |
| B. | Solid in mercury |
| C. | Liquid in solid |
| D. | Liquid in liquid |
| Answer» C. Liquid in solid | |
| 641. |
Study the given Venn diagram carefully. Which of the following colloidal systems correctly represent points 1, 2 and 3? |
| A. | 123MistWhipped creamDust fumes |
| B. | 123MilkHair creamPumice stone |
| C. | 123PaintsSmokeCloud |
| D. | 123Coloured glassesWings of butter fliesButter |
| Answer» D. 123Coloured glassesWings of butter fliesButter | |
| 642. |
What kind of solution is drinking soda? |
| A. | Gas in liquid |
| B. | Liquid in gas |
| C. | Gas in gas |
| D. | Solid in liquid |
| Answer» B. Liquid in gas | |
| 643. |
Read the given passage and fill in the blanks by choosing an appropriate option.When a mixture of two ___i___ liquids having a difference of \[25{}^\circ C\] in their boiling points is to be separated, a ___ii___ is used which increases the ___iii___ surface area. As a result, when the vapours of both the liquids rise, the ___iv___ volatile liquid will condense while the vapours of ___v___ volatile liquid will rise. |
| A. | (i)(ii)(iii)(iv)(v)ImmiscibleDistillation flaskHeatingMoreLess |
| B. | (i)(ii)(iii)(iv)(v)Non-volatileCondenserCoolingLessMore |
| C. | (i)(ii)(iii)(iv)(v)MiscibleFractionating columnCoolingLessMore |
| D. | (i)(ii)(iii)(iv)(v)VolatileCondenserHeatingMoreLess |
| Answer» D. (i)(ii)(iii)(iv)(v)VolatileCondenserHeatingMoreLess | |
| 644. |
Shaving cream produces foam. What kind of colloid is shaving cream? |
| A. | Liquid dispersed in a gas |
| B. | Gas dispersed in a liquid |
| C. | Solid dispersed in a liquid |
| D. | Solid dispersed in a gas |
| Answer» C. Solid dispersed in a liquid | |
| 645. |
Ms Mehta, a science teacher gave different mixtures to four groups of students to separate their components. Which group was not following the correct method? |
| A. | Group 1 was separating a mixture of ethyl alcohol and water by using separating funnel. |
| B. | Group 2 was separating a mixture of ammonium chloride and sodium chloride using sublimation. |
| C. | Group 3 was separating a mixture of iron pins and sand by using a magnet. |
| D. | Group 4 was separating mud particles suspended in water using sedimentation and decantation. |
| Answer» B. Group 2 was separating a mixture of ammonium chloride and sodium chloride using sublimation. | |
| 646. |
Natural water is impure and needs to be purified before this water can be supplied to homes for drinking purposes. The sequence of steps involved in purification of water is |
| A. | Filtration, sedimentation, decantation and aeration |
| B. | Sedimentation, loading, filtration and chlorination |
| C. | Chlorination, aeration, sedimentation and filtration |
| D. | Chlorination, filtration and distillation. |
| Answer» C. Chlorination, aeration, sedimentation and filtration | |
| 647. |
In both dialysis and osmosis which particles do not pass through the semipermeable membrane? |
| A. | Water |
| B. | Small molecules |
| C. | Colloids |
| D. | All of the above |
| Answer» D. All of the above | |
| 648. |
Sahil took a white solid from his teacher to find out its melting point. During the experiment, he found that the melting point was \[\text{160 }\!\!{}^\circ\!\!\text{ C}\]. But, the teacher told him that actual melting point of the solid is \[\text{150 }\!\!{}^\circ\!\!\text{ C}\]. What could be the reason for Sahil's observation? |
| A. | Melting point of a solid depends upon the procedure and the amount taken. |
| B. | Solids can have different melting points depending upon the method of storage. |
| C. | The solid contains some impurities mixed with the pure compound. |
| D. | If solid is heated strongly, the melting point increases. |
| Answer» D. If solid is heated strongly, the melting point increases. | |
| 649. |
What is the function of X in the given experimental set-up? |
| A. | To apply pressure to the mixture in distillation flask |
| B. | To allow only lower boiling component to escape |
| C. | To cool and condense the vapours |
| D. | To allow the water from the mixture to move out |
| Answer» D. To allow the water from the mixture to move out | |
| 650. |
What is a sol? |
| A. | A solid dispersed in a liquid |
| B. | A liquid dispersed in a gas |
| C. | A gas dispersed in a liquid |
| D. | A gas dispersed in a solid |
| Answer» B. A liquid dispersed in a gas | |