InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Acid rain isA. Basic.B. acidicC. neutralD. none of these |
| Answer» Correct Answer - B | |
| 2. |
The pH of lemon juice isA. `2.5`B. `3.5`C. ` 4.1`D. `6.5` |
| Answer» Correct Answer - A | |
| 3. |
Which of the following is an alkali ?A. Ferrous hydroxideB. Copper hydroxideC. Zinc hydroxideD. Sodium hydroxide |
| Answer» Correct Answer - D | |
| 4. |
The valency of copper in `CuSO_(4) . 5H_(2)O ` isA. 1B. 3C. 2D. 0 |
| Answer» Correct Answer - C | |
| 5. |
The valency of copper in `CuSO_(4)*5H_(2)O` isA. 1B. 3C. 2D. 0 |
| Answer» Correct Answer - C | |
| 6. |
Name a compound of copper in which copper shows the valency of 1 . |
| Answer» Cuprous chloride `(Cu_(2)Cl_(2))`. | |
| 7. |
When rain is acccompanied by lightning , the rainwater which is collected will have the pH valueA. lower than rainwater without lightningB. higher than rainwater without lightningC. unchangedD. none of the above |
| Answer» Correct Answer - A | |
| 8. |
Which of the following ions can turn red litmus solution blue ?A. `H^(+)`B. `OH^(-)`C. `CI^(+)`D. ` O^(2-)` |
| Answer» Correct Answer - B | |
| 9. |
Why does lemon juice turn blue litmus solution red ? |
| Answer» Because leman juice is acidic. | |
| 10. |
Why does the uncovered portion of the leaf turn blue-black after putting iodine solution on it ? |
| Answer» The uncovered portion receives light and synthesizes starch by photosynthesis. | |
| 11. |
A universal indicator isA. an individual indicatorB. a mixture of indicatorsC. a solution of methyl orange in ethanolD. none of the above |
| Answer» Correct Answer - B | |
| 12. |
Which organic compound is formed when acetic acid is warmed whith ethyl alcohol in the presence of concentrated `H_(2)SO_(4)` ? |
| Answer» Ethyl acetate . | |
| 13. |
Why does copper not displace hydrogen from dillute acids ? |
| Answer» This because copper is less reactive than hydrogen. | |
| 14. |
The pH of an aqueous solution of sodium hydroxide isA. equal to 7B. greater than 7C. less than 7D. 0 |
| Answer» Correct Answer - B | |
| 15. |
A colourless liquid truns neither blue litmus red nor red litmus to produce hydrogen gas isA. Acidic .B. neutralC. basicD. none of these |
| Answer» Correct Answer - B | |
| 16. |
A portion of destarched leaf of a potted plant was covered with a black strip of paper. The plant was then exposed to sunlight for six hours and then tested for starch. It was observed that:A. Respiration will stopB. Respiration will be enhancedC. Starch will not be synthesizedD. Starch will be synthesized |
| Answer» Correct Answer - C | |
| 17. |
The usefulness of a universal indicator is thatA. it gives a better resultB. it does not change the colour of the solutionC. it covers a wide range of pHD. its colour does not fade away |
| Answer» Correct Answer - C | |
| 18. |
Does the following reaction occur ? ` Cu + ZnSO_(4) to CuSO_(4) + Zn` |
| Answer» Correct Answer - No . | |
| 19. |
One of the metals which reacts with hot sodium hydroxide solution to produce hydrogen gas isA. sodiumB. magnesiumC. zincD. gold |
| Answer» Correct Answer - C | |
| 20. |
The colour of a pH paper strip turned red when it was dipped into a sample. The sample could beA. dilute `NaHCO_(3)` solutionB. tap waterC. dilute NaOH solutionD. dilute HCI |
| Answer» Correct Answer - D | |
| 21. |
Metallic zinc displaces hydrogen from dilute acids and water becauseA. zinc is more electropositive than hydrogenB. zinc and hydrogen are both electropositiveC. zinc is less electropositive than hydrogenD. zinc and hydrogen are equally reactive |
| Answer» Correct Answer - A | |
| 22. |
The order of rectivity of Zn, Fe, Cu and Al isA. Zn gt Cu gt Al gt FeB. Zn gt Al gt Cu gt FeC. Al gt Zn gt Fe gt CuD. Zn gt Al gt Fe gt Cu |
| Answer» Correct Answer - C | |
| 23. |
When zinc powder is heated with sodium hydroxide solution , the substances formed areA. zinc hydroxide and hydrogenB. zinc oxide and oxygenC. sodium zincate and hydrogenD. zinc hydroxide and water |
| Answer» Correct Answer - C | |
| 24. |
When a copper plate is dipped into a solution of ferrous sulphate , the colour of the solution will change toA. redB. greenC. blueD. none of these |
| Answer» Correct Answer - D | |
| 25. |
When a copper plate is dipped into a solution of ferrous sulphate, the colour of the solution will change toA. redB. greenC. blueD. none of these |
| Answer» Correct Answer - D | |
| 26. |
What is activity series of metals ? |
| Answer» The series in which the metals are arranged in order of decreasing reactivity is called activity series of metals. | |
| 27. |
Does any reaction take place when a copper strip is dipped into a solution of zinc sulphate ? |
| Answer» Correct Answer - No | |
| 28. |
Iron displaces copper from copper sulphate solution becauseA. copper is more reactive than ironB. copper and iron equally reactiveC. iron is more reactive than copperD. none of the above is true |
| Answer» Correct Answer - C | |
| 29. |
When a piece of zinc is added to blue copper sulphate solution, the solution becomesA. orangeB. greenC. colourlessD. violet and then turns greens |
| Answer» Correct Answer - C | |
| 30. |
When a piece of iron is placed in a solution of copper sulphate, the blue color of the solution is changed toA. yellowB. brownC. greenD. orange |
| Answer» Correct Answer - C | |
| 31. |
When an iron rod is dipped into a solution of copper sulphate, copper is displaced. This is becauseA. iron is more electropositive than copperB. iron is less electropositive than copperC. both iron and copper are metalsD. copper is more reactive than iron |
| Answer» Correct Answer - A | |
| 32. |
In the reaction `Fe + CuSO_(4) to FeSO_(4) + Cu` , what is the role of Fe ? |
| Answer» Fe acts as a reducing agent . | |
| 33. |
Why does magnesium dipped into a `ZnSO_(4)` solution displace Zn ? |
| Answer» This is because Mg is more reactive than Zn. | |
| 34. |
Name the part of the plant which develops from the radicle in dicots. |
| Answer» Tap root or primary root | |
| 35. |
Which part of the suspensor forms some portion of radicle ? |
| Answer» Correct Answer - Hypophysis | |
| 36. |
Why is root said to be positively geotropic ? |
| Answer» Because it grows towards the centre of gravity | |
| 37. |
Which tissue is found in abundance in fibre-yielding plants jute and flax ?A. CollenchymaB. SclerenchymaC. ParenchymaD. All of these |
| Answer» Correct Answer - B | |
| 38. |
Why are the sclerenchymatous cells hard ? |
| Answer» They are hard because their cell wall is thickened with lignin. | |
| 39. |
What is the difference between hard and soft water ? |
| Answer» Hard water contains the bicarbonates, chlorides or sulphates of calcium and magnesium , whereas soft water is free from these substances. | |
| 40. |
Why is the height of the lather formed measured immediately after it is formed ? |
| Answer» Lather contains small air bubbles. If left exposed , bubbles will burst and the lather will die down. | |
| 41. |
What is budding ? |
| Answer» Budding is a type of asexual reproduction in which a new individual develops within the body wall or from the cell membrane of the parent by forming a bulblike outgrowth , called bud. | |
| 42. |
A rice plant is an example of aA. dicotB. monocotC. gymnospermsD. fern |
| Answer» Correct Answer - B | |
| 43. |
The seed remain enclosed in a fruit inA. mossesB. fernsC. gymnospermsD. angiosperms |
| Answer» Correct Answer - D | |
| 44. |
What are the differnces between the male and female comes of Pinus ?A. The male cones are fewer than the female conesB. The male cones are larger than the female conesC. The male cones are smaller and many more than the female cones.D. None of these |
| Answer» Correct Answer - C | |
| 45. |
What is angiosperm? |
| Answer» Two types of branches- long shoots and dwarf shoots. | |
| 46. |
Why is the rate of photosynthesis reduced considerably in green light ? |
| Answer» Green light is reflected by the chlorophyll molecules and is not used in photosynthesis. | |
| 47. |
Why do we select germinating seeds for studying respiration ? |
| Answer» Germinating seeds respire actively. | |
| 48. |
All samples of water contain hydrogen and oxygen in the mass ratio ` 1:8`. This is in agreement with the law ofA. conservation of massB. constant proportionsC. multiple proportionsD. gaseous volumes |
| Answer» Correct Answer - B | |
| 49. |
The scientist who heated tin in a retort to verify the law of conservation of mass in a chemical reaction wasA. PristleyB. LavoisierC. DaltonD. Thomson |
| Answer» Correct Answer - B | |
| 50. |
The scientist who heated tin in a retort to verify the law of convservation of mass in a chemical reactionA. pristleyB. LavoisierC. DaltonD. Thomson |
| Answer» Correct Answer - B | |