MCQOPTIONS
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MCQOPTIONS
This section includes 837 Mcqs, each offering curated multiple-choice questions to sharpen your Grade10 knowledge and support exam preparation. Choose a topic below to get started.
| 401. |
The boiling point of kerosene is |
| A. | below 20 °C |
| B. | 35 °C to 70 °C |
| C. | 70 °C to 120 °C |
| D. | 170 °C to 250 °C |
| Answer» E. | |
| 402. |
What is the color of Bromothymol blue in basic solution? |
| A. | yellow |
| B. | blue |
| C. | pink |
| D. | colorless |
| Answer» C. pink | |
| 403. |
What is the color of Phenolphthalein in acidic solution? |
| A. | red |
| B. | yellow |
| C. | blue |
| D. | colorless |
| Answer» E. | |
| 404. |
What happens when a solution becomes acidic? |
| A. | [H+] increases |
| B. | [H+] decreases |
| C. | [OH-] increases |
| D. | [OH-] decreases |
| Answer» B. [H+] decreases | |
| 405. |
Citric acid converts amines to |
| A. | nitric acid |
| B. | non-volatile salts |
| C. | hydrochloric acid |
| D. | sulphuric acid |
| Answer» C. hydrochloric acid | |
| 406. |
Which of the following decreases when pH is less than 7? |
| A. | [H+] |
| B. | [OH-] |
| C. | [O-] |
| D. | [O+] |
| Answer» C. [O-] | |
| 407. |
The solution becomes acidic when pH is |
| A. | greater than 7 |
| B. | less than 7 |
| C. | greater than 6 |
| D. | less than 6 |
| Answer» C. greater than 6 | |
| 408. |
What is the term used for a salt containing a replaceable OH group? |
| A. | basic salt |
| B. | common salt |
| C. | acid salt |
| D. | normal salt |
| Answer» B. common salt | |
| 409. |
What is the cause of an unpleasant fishy odor? |
| A. | amines |
| B. | sea water |
| C. | dirt |
| D. | worms |
| Answer» B. sea water | |
| 410. |
Water is an example of |
| A. | acid |
| B. | base |
| C. | amphoteric substance |
| D. | salt |
| Answer» D. salt | |
| 411. |
Which of the following is used in making mortar, plasters, cement? |
| A. | sodium hydroxide |
| B. | potassium hydroxide |
| C. | calcium hydroxide |
| D. | magnesium hydroxide |
| Answer» D. magnesium hydroxide | |
| 412. |
Which of the following statements about catalysts is not true? |
| A. | they speed up a chemical reaction |
| B. | they reduce the time taken to reach equilibrium |
| C. | they have effect on the position of equilibrium once it is reached |
| D. | they have no effect on the position of equilibrium one it is reached |
| Answer» D. they have no effect on the position of equilibrium one it is reached | |
| 413. |
If a change is imposed in concentration, temperature or pressure on a chemical system at equilibrium, the system responds in a way that the change is |
| A. | not opposed |
| B. | opposed |
| C. | rapidly increased |
| D. | slowly increased |
| Answer» C. rapidly increased | |
| 414. |
The process by which ammonia is produced by the reaction of nitrogen with hydrogen at 200 atm pressure and in the presence of a catalyst is called |
| A. | contact process |
| B. | recovery of ammonia |
| C. | calcination |
| D. | Haber process |
| Answer» E. | |
| 415. |
The equilibrium constant can be used to |
| A. | predict direction of chemical reaction |
| B. | predict extent of chemical reaction |
| C. | determine the equilibrium concentration of mixture |
| D. | all of above |
| Answer» E. | |
| 416. |
The reactions in which reactants react to form products and simultaneously products reverse back into reactants are called |
| A. | reversible reactions |
| B. | irreversible reaction |
| C. | spontaneous reactions |
| D. | non spontaneous reactions |
| Answer» B. irreversible reaction | |
| 417. |
Step of sewage water treatment in which there are some aeration and organic material is converted to inorganic materials is called |
| A. | primary sewage treatment |
| B. | secondary sewage treatment |
| C. | activated sludge treatment |
| D. | chlorination |
| Answer» C. activated sludge treatment | |
| 418. |
Permanent hardness of water is caused due to the presence of dissolved |
| A. | calcium hydrogen carbonates |
| B. | magnesium hydrogen carbonates |
| C. | chlorides of magnesium |
| D. | Sulphates of magnesium |
| Answer» E. | |
| 419. |
What is the percentage of water from rivers and lakes? |
| A. | 0 |
| B. | 0.002 |
| C. | 0.006 |
| D. | 0.021 |
| Answer» C. 0.006 | |
| 420. |
What is the second step of raw water treatment? |
| A. | sedimentation |
| B. | coagulation |
| C. | filtration |
| D. | chlorination |
| Answer» C. filtration | |
| 421. |
What percentage of fresh water is available to man? |
| A. | 0.2 |
| B. | 0.02 |
| C. | 0.002 |
| D. | 0.0002 |
| Answer» D. 0.0002 | |
| 422. |
The first step of sewage water treatment is called |
| A. | primary sewage treatment |
| B. | secondary sewage treatment |
| C. | activated sludge treatment |
| D. | chlorination |
| Answer» B. secondary sewage treatment | |
| 423. |
Addition of washing soda removes |
| A. | softness of water |
| B. | temporary hardness of water |
| C. | permanent hardness of water |
| D. | hydrogen from water |
| Answer» D. hydrogen from water | |
| 424. |
Natural water is |
| A. | pure |
| B. | impure |
| C. | non distilled |
| D. | distilled |
| Answer» C. non distilled | |
| 425. |
How many basic steps are involved in raw water treatment? |
| A. | three |
| B. | four |
| C. | five |
| D. | six |
| Answer» C. five | |
| 426. |
Process in which water is filtered through sand and gravel is called |
| A. | sedimentation |
| B. | coagulation |
| C. | filtration |
| D. | chlorination |
| Answer» D. chlorination | |
| 427. |
Ice floats on top of the water because |
| A. | water expands on freezing |
| B. | water contracts on freezing |
| C. | ice is lighter than water |
| D. | none of above |
| Answer» B. water contracts on freezing | |
| 428. |
What is the total amount of water present on Earth? |
| A. | 1.33 billion cubic kilometers |
| B. | 1.33 billion cubic meters |
| C. | 1.33 million cubic kilometers |
| D. | 1.33 million cubic meters |
| Answer» B. 1.33 billion cubic meters | |
| 429. |
Hard water can block radiators due to the formation of |
| A. | insoluble calcium and magnesium salts |
| B. | insoluble sodium salts |
| C. | insoluble phosphate salts |
| D. | insoluble potassium salts |
| Answer» B. insoluble sodium salts | |
| 430. |
How much percentage of the Earth's crust is covered by water? |
| A. | 0.69 |
| B. | 0.71 |
| C. | 0.8 |
| D. | 0.75 |
| Answer» C. 0.8 | |
| 431. |
Which of the following is a disease that proceeds from obstruction of the liver? |
| A. | cholera |
| B. | dysentery |
| C. | jaundice |
| D. | hepatitis |
| Answer» D. hepatitis | |
| 432. |
The hardness which can be removed by boiling is called |
| A. | permanent hardness |
| B. | temporary hardness |
| C. | stiffness |
| D. | toughness |
| Answer» C. stiffness | |
| 433. |
What is the percentage of water from oceans? |
| A. | 0 |
| B. | 0.002 |
| C. | 0.006 |
| D. | 0.97 |
| Answer» E. | |
| 434. |
Water exists in how many different states on Earth? |
| A. | one |
| B. | two |
| C. | three |
| D. | four |
| Answer» D. four | |
| 435. |
Water that gives little lather is called |
| A. | hard water |
| B. | soft water |
| C. | dirty water |
| D. | clean water |
| Answer» C. dirty water | |
| 436. |
The third step of sewage water treatment is called |
| A. | primary sewage treatment |
| B. | secondary sewage treatment |
| C. | activated sludge treatment |
| D. | chlorination |
| Answer» D. chlorination | |
| 437. |
Process in which chlorine is added to water to kill any remaining bacteria is called |
| A. | sedimentation |
| B. | coagulation |
| C. | filtration |
| D. | chlorination |
| Answer» E. | |
| 438. |
Water that does not form scum is called |
| A. | hard water |
| B. | soft water |
| C. | dirty water |
| D. | clean water |
| Answer» B. soft water | |
| 439. |
Water in swimming pools is purified by adding |
| A. | sodium |
| B. | chlorine |
| C. | phosphorus |
| D. | potassium |
| Answer» C. phosphorus | |
| 440. |
Which of the following is an acute inflammation of the liver? |
| A. | cholera |
| B. | dysentery |
| C. | jaundice |
| D. | hepatitis |
| Answer» E. | |
| 441. |
Process in which water is allowed to stand in a reservoir is called |
| A. | sedimentation |
| B. | coagulation |
| C. | filtration |
| D. | chlorination |
| Answer» B. coagulation | |
| 442. |
Vitamin C is necessary for |
| A. | eyes and skin |
| B. | energy production in cells |
| C. | healing wounds and preventing colds |
| D. | bones and teeth |
| Answer» D. bones and teeth | |
| 443. |
The building blocks of lipids are |
| A. | fats |
| B. | oils |
| C. | proteins |
| D. | fatty acids |
| Answer» E. | |
| 444. |
The fat-soluble vitamin is |
| A. | vitamin B |
| B. | vitamin C |
| C. | vitamin D |
| D. | vitamin F |
| Answer» D. vitamin F | |
| 445. |
Which of the following are classified as disaccharides, Trisaccharides, etc.? |
| A. | monosaccharides |
| B. | oligosaccharides |
| C. | polysaccharides |
| D. | starch |
| Answer» C. polysaccharides | |
| 446. |
How many different amino acids are involved in protein synthesis? |
| A. | 10 |
| B. | 20 |
| C. | 30 |
| D. | 40 |
| Answer» C. 30 | |
| 447. |
What is the term used for a formula that uses established abbreviations for various groups of a chain? |
| A. | molecular formula |
| B. | structural formula |
| C. | condensed formula |
| D. | empirical formula |
| Answer» D. empirical formula | |
| 448. |
Natural gas mostly consists of |
| A. | ethane |
| B. | butane |
| C. | methane |
| D. | pentane |
| Answer» D. pentane | |
| 449. |
How many isomers are contained by Hexane? |
| A. | two |
| B. | three |
| C. | four |
| D. | five |
| Answer» E. | |
| 450. |
Formic acid is also called |
| A. | Methanoic acid |
| B. | ethanoic acid |
| C. | carboxylic acid |
| D. | acetone |
| Answer» B. ethanoic acid | |