A) Sieving done clear
B) Handpicking done clear
C) Threshing done clear
D) Winnowing done clear
View Solution play_arrowquestion_answer2) What type of a substance is steel?
A) A solid - liquid heterogeneous mixture done clear
B) A solid - solid heterogeneous mixture done clear
C) A solid - solid homogeneous mixture done clear
D) A pure substance done clear
View Solution play_arrowquestion_answer3) Vinegar is a solution of acetic acid in water. What kind of mixture is vinegar?
A) A homogeneous mixture of solid and liquid done clear
B) A heterogeneous mixture of liquid and liquid done clear
C) A homogeneous mixture of liquid and liquid done clear
D) A heterogeneous mixture of solid and liquid done clear
View Solution play_arrowA) Sedimentation done clear
B) Liquification done clear
C) Hand picking done clear
D) Decantation done clear
View Solution play_arrowA) Water + sand + glass done clear
B) Oxygen + hydrogen + salt done clear
C) Stones + rice + water done clear
D) Chalk powder + sugar + water done clear
View Solution play_arrowA) Sugar done clear
B) Chalk powder done clear
C) Glass done clear
D) Oxygen done clear
View Solution play_arrowA) Sugar done clear
B) Chalk powder done clear
C) Alcohol done clear
D) Oxygen done clear
View Solution play_arrowquestion_answer8) How are grain seeds removed from their stalks?
A) Sieving done clear
B) Winnowing done clear
C) Threshing done clear
D) All of the above done clear
View Solution play_arrowquestion_answer9) A compound has
A) only one kind of mixture. done clear
B) only one kind of element. done clear
C) a mixture of elements and molecules. done clear
D) only one kind of molecules. done clear
View Solution play_arrowquestion_answer10) A Identify the mixture from the following.
A) Oxygen done clear
B) Carbon dioxide done clear
C) Hydrogen done clear
D) Air done clear
View Solution play_arrowquestion_answer11) Identify the compound from the following.
A) Oxygen done clear
B) Carbon dioxide done clear
C) Hydrogen done clear
D) Air done clear
View Solution play_arrowquestion_answer12) Identify the element from the following.
A) Oxygen done clear
B) Carbon dioxide done clear
C) Water done clear
D) Air done clear
View Solution play_arrowquestion_answer13) Which of the following is an example of a solid-in-gas mixture?
A) Soil done clear
B) Smoke done clear
C) Moisture done clear
D) Dew done clear
View Solution play_arrowquestion_answer14) Which of the following does NOT belong to the group formed by the others?
A) Brass done clear
B) Water done clear
C) Butter-milk done clear
D) Steel done clear
View Solution play_arrowquestion_answer15) A pure substance is made of
A) only one kind of atoms or molecules. done clear
B) two or more kinds of molecules. done clear
C) mixture of homogeneous substances done clear
D) all of the above done clear
View Solution play_arrowquestion_answer16) Which of the following statements about a mixture is TRUE?
A) It is a pure substance. done clear
B) Its constituents are not combined chemically. done clear
C) Its constituents do not retain their individual properties. done clear
D) It is always homogeneous. done clear
View Solution play_arrowquestion_answer17) In a mixture, constituents exhibit
A) similar properties. done clear
B) only those properties which are characteristic to the mixture. done clear
C) their own properties. done clear
D) no properties. done clear
View Solution play_arrowquestion_answer18) What is the process by which a gas changes into a liquid?
A) Decantation done clear
B) Sublimation done clear
C) Condensation done clear
D) Sedimentation done clear
View Solution play_arrowquestion_answer19) What kind of mixtures are alloys?
A) Solid-Gas done clear
B) Liquid-Liquid done clear
C) Gas-Gas done clear
D) Solid-Solid done clear
View Solution play_arrowquestion_answer20) What kind of mixtures are aerated drinks?
A) Solid-Solid done clear
B) Liquid-Solid done clear
C) Gas-Liquid done clear
D) Liquid-Liquid done clear
View Solution play_arrowquestion_answer21) Identify the liquid-in-gas type of mixture from the following.
A) Dissolved carbon dioxide in water done clear
B) Droplets of water in air done clear
C) Dissolved oxygen in water done clear
D) All of the above done clear
View Solution play_arrowquestion_answer22) A homogeneous mixture
A) is made up of one type of molecules. done clear
B) is the one in which the components can be distinguished. done clear
C) is the one in which the components cannot be distinguished. done clear
D) can be separated into its constituents physically. done clear
View Solution play_arrowA) Winnowing, Magnetic separation done clear
B) Magnetic separation, Winnowing done clear
C) Sieving, Magnetic separation. Filtration done clear
D) Handpicking, Sublimation, Sieving done clear
View Solution play_arrowA) Separation of butter from curd. done clear
B) Separation of salt from sea water. done clear
C) Sprinkling water on a dusty street before sweeping. done clear
D) Separation of grain seeds from their stalks. done clear
View Solution play_arrowA) Winnowing done clear
B) Sieving done clear
C) Threshing done clear
D) Magnetic separation done clear
View Solution play_arrowquestion_answer26) Given below are some methods of separation.
| X Winnowing |
| Y-Threshing |
| Z- Sieving |
A) Only X done clear
B) Only Y, Z done clear
C) Only Z, X done clear
D) X, Y and Z done clear
View Solution play_arrowquestion_answer27) How is scrap-iron separated from other wastes in the scrap yard?
A) Sublimation done clear
B) Magnetic separation done clear
C) Handpicking done clear
D) Winnowing done clear
View Solution play_arrowquestion_answer28) Match the entries in Column-I with those in Column-II
| Column - I | Column - II | ||
| a. | A chalk water mixture | 1. | A gaseous mixture |
| b. | A glucose solution | 2. | A heterogeneous solid-liquid mixture |
| c. | Carbonated water | 3. | A homogeneous solid-liquid mixture |
| d. | Air | 4. | A gas - liquid mixture |
A) \[a-2,\text{ }b-3,\text{ }c-4,\text{ }d-1\] done clear
B) \[a-1,\text{ }b-4,\text{ }c-2,\text{ }d-3\] done clear
C) \[a-2,\text{ }b-4,\text{ }c-3,\text{ }d-1\] done clear
D) \[a-2,\text{ }b-4,\text{ }c-1,\text{ }d-3\] done clear
View Solution play_arrowquestion_answer29) Which of the following mixtures can be separated by using a filter paper?
A) Vinegar done clear
B) Saltwater done clear
C) Sand and water done clear
D) Sugar water done clear
View Solution play_arrowquestion_answer30) Study the table given below.
| Mixture | Wanted | Unwanted |
| 1. Wheat flour | Flour | X |
| 2. Y | Grain seeds | Stalks |
A)
| X | Y |
| Husk | Cut paddy |
B)
| X | Y |
| Wheat | Husk |
C)
| X | Y |
| Wheat | Sawdust |
D)
| X | Y |
| Husk | Sand |
question_answer31) Which process is used to separate a pure solid from a solid-liquid solution?
A) Simple distillation done clear
B) Crystallization done clear
C) Filtration done clear
D) Sedimentation and decantation done clear
View Solution play_arrowquestion_answer32) Given below are some physical properties.
| (i) Physical state |
| (ii) Density |
| (iii) Size of constituents |
A) Only (i) and (ii) done clear
B) Only (ii) and (iii) done clear
C) Only (i) and (iii) done clear
D) (i), (ii) and (iii) done clear
View Solution play_arrowquestion_answer33) What happens when distilled water is evaporated?
A) Some salt is left behind. done clear
B) Some sand is left behind. done clear
C) Some sugar is left behind. done clear
D) Nothing is left behind. done clear
View Solution play_arrowquestion_answer34) Which process is used for separating a mixture of water and sulphur?
A) Filtration done clear
B) Winnowing done clear
C) Evaporation done clear
D) Distillation done clear
View Solution play_arrowquestion_answer35) Which of the following are involved in filtration technique?
A) Hair in our nostrils done clear
B) Oil and air filters in cars done clear
C) Air filters in air conditioners done clear
D) All of the above done clear
View Solution play_arrowA) Filtration done clear
B) Crystallization done clear
C) Sublimation done clear
D) Fractional distillation done clear
View Solution play_arrowA) Salt done clear
B) Flour done clear
C) Sand done clear
D) Iron filings done clear
View Solution play_arrowquestion_answer38) Study the information given below.
| Some substances are made up of two or more elements combined together chemically. |
| Properties of these substances are different from the elements that make them. |
| This substances cannot be broken down by physical methods. |
A) Iodine done clear
B) Calcium done clear
C) Air done clear
D) Sugar done clear
View Solution play_arrowquestion_answer39) Which process takes place in a washing machine while clothes are being dried.
A) Magnetic separation done clear
B) Filtration done clear
C) Evaporation done clear
D) Centrifugation done clear
View Solution play_arrowquestion_answer40) The flow chart given below are examples of materials X and Y. 
Identify X and Y.
A)
| X | Y |
| Non metals | Metals |
B)
| X | Y |
| Mixtures | Metals |
C)
| X | Y |
| Compounds | Elements |
D)
| X | Y |
| Compounds | Pure substances |
question_answer41) Which of the following statements is NOT true?
A) No more salt can be dissolved in a saturated solution of salt water without heating. done clear
B) Water dissolves different amounts of soluble substances in it. done clear
C) A mixture of milk and water can be separated by filtration. done clear
D) Salt is separated from sea water by evaporation. done clear
View Solution play_arrowquestion_answer42) By which method is wheat flour separated from wheat bran?
A) Handpicking done clear
B) Sieving done clear
C) Winnowing done clear
D) Filtration done clear
View Solution play_arrowquestion_answer43) Which of the following is NOT a pure substance?
A) Argon done clear
B) Helium done clear
C) Water done clear
D) Air done clear
View Solution play_arrowquestion_answer44) Why do we separate substances in a mixture?
| (i) To separate two different but useful components. |
| (ii) To remove useless components. |
| (iii) To remove impurities. |
A) Only (i) and (ii) done clear
B) Only (ii) and (iii) done clear
C) Only (i) and (iii) done clear
D) (i), (ii) and (iii) done clear
View Solution play_arrow| (i) This phenomenon is known as condensation. |
| (ii) This proves that water vapour is present in air. |
| (iii) This is also observed when a hot object is cooled in the open. |
A) Only (i) and (ii) done clear
B) Only (ii) and (iii) done clear
C) Only (i) and (iii) done clear
D) (i), (ii) and (iii) done clear
View Solution play_arrow
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What could the mixture be? 
What is substance Q? 
Which of the following substances can be separated from the mixture by using a magnet? 
