MCQOPTIONS
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MCQOPTIONS
This section includes 40 Mcqs, each offering curated multiple-choice questions to sharpen your Science knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Some liquids are good conductors of electricity and some are poor conductors.Which one is a poor conductor? |
| A. | Acidic solution |
| B. | Alkaline solution |
| C. | Common Salt solution |
| D. | Distilled water |
| Answer» E. | |
| 2. |
Tin cans, used for storing food, are made by electroplating tin onto iron. Why? |
| A. | Tin gives a shiny appearance |
| B. | To make the vessel cheap |
| C. | Tin is less reactive than iron. |
| D. | To make the vessel lighter |
| Answer» D. To make the vessel lighter | |
| 3. |
Chromium plating is done on many objects such as car parts, bath taps, kitchen gasstove etc. Why? |
| A. | It does not corrode but prevents scratches |
| B. | It looks beautiful |
| C. | It costs less |
| D. | Articles can be sold at higher price |
| Answer» B. It looks beautiful | |
| 4. |
The process of depositing a layer of any desired metal on another material bymeans of electricity is called ___________. |
| A. | Electric plating |
| B. | Electroplating |
| C. | Electric depositing |
| D. | None of the above |
| Answer» C. Electric depositing | |
| 5. |
When electrodes are immersed in water and electricity passed, the bubbles formedon the positive terminal is actually _______ gas. |
| A. | Hydrogen |
| B. | Carbon di oxide |
| C. | Oxygen |
| D. | Nitrogen |
| Answer» D. Nitrogen | |
| 6. |
When electrodes are immersed in water and electricity passed, the bubbles formedon the negative terminal is actually _______ gas. |
| A. | Hydrogen |
| B. | Carbon di oxide |
| C. | Oxygen |
| D. | Nitrogen |
| Answer» B. Carbon di oxide | |
| 7. |
A coating of _________is deposited on iron to protect it from corrosion andformation of rust |
| A. | copper |
| B. | aluminium |
| C. | Zinc |
| D. | silver |
| Answer» D. silver | |
| 8. |
Why do we add little dilute sulphuric acid to copper sulphate solution duringelectroplating? |
| A. | To increase acidity |
| B. | To increase conductivity |
| C. | So that the colour becomes more prominent |
| D. | To burn copper sulphate |
| Answer» C. So that the colour becomes more prominent | |
| 9. |
Tap water is a good conductor of electricity while distilled water is not because |
| A. | Tap water contain salts |
| B. | Distilled water do not contain salt |
| C. | Only a) is correct |
| D. | Both a &b is correct |
| Answer» E. | |
| 10. |
In LEDs, the longer lead (wire) is always connected to the _______ terminal |
| A. | negative |
| B. | neutral |
| C. | positive |
| D. | Any terminal |
| Answer» D. Any terminal | |
| 11. |
Which of the following are the characteristics of an electrolyte? |
| A. | It has a positive charge. |
| B. | It has a negative charge. |
| C. | III only |
| D. | It forms positive and negative ions. |
| Answer» E. | |
| 12. |
A Which of the following statements is NOT correct? |
| A. | The ions are free to move about in an electrolyte. |
| B. | The solution which can form ions is used for electroplating. |
| C. | Temperature will rise only in beaker IV as redox reactions are exothermic. |
| D. | An electric bulb glows due to the heating effect of current. |
| Answer» D. An electric bulb glows due to the heating effect of current. | |
| 13. |
In a cell, by convention, from where does the charge seem to be flowing through? |
| A. | From positive electrode to negative electrode |
| B. | From negative electrode to positive electrode |
| C. | (i)(ii)(iii)(iv)Sodium bicarbonateEndothermicSodium carbonateBaking |
| D. | Cannot be said |
| Answer» B. From negative electrode to positive electrode | |
| 14. |
In which one of the following situations does a conventional electric current flow due north? |
| A. | Protons in a beam are moving due south. |
| B. | A water molecule is moving due north. |
| C. | \[CaC{{O}_{3}}\to CaO+C{{O}_{2}}\] |
| D. | None of these |
| Answer» D. None of these | |
| 15. |
In which of the following will the bulb glow? |
| A. | |
| B. | |
| C. | \[{{C}_{3}}{{H}_{6}}+4{{O}_{2}}\to 3C{{O}_{2}}+3{{H}_{2}}O\] |
| D. | |
| Answer» E. | |
| 16. |
In the given figure, electrolyte, anode and cathode respectively are |
| A. | A, B and C |
| B. | B, A and C |
| C. | By heat |
| D. | A, C and B |
| Answer» C. By heat | |
| 17. |
In electrolytic solutions, which of the following acts as carrier of charge? |
| A. | Protons |
| B. | Electrons |
| C. | Synthesis reaction |
| D. | Ions |
| Answer» E. | |
| 18. |
The bumpers and door handles of motor cars, taps etc. are coated with silvery layer of chromium because(i) It does not easily get corroded.(ii) It forms a hard layer which does not easily get scratched.(iii) It tarnishes quickly.(iv) It is cheap.Which of the following options is correctly identifies true (T) or false (F)? |
| A. | (i)(ii)(iii)(iv)FFTT |
| B. | (i)(ii)(iii)(iv)TTFF |
| C. | A physical reaction |
| D. | (i)(ii)(iii)(iv)TTFT |
| Answer» E. | |
| 19. |
Direction: Four substances were tested for their electrical conductivity. The results are shown in the table. Study the table and answer the following questions. Substance Bulb Substance at Cathode Substance at Anode P Lights up Aluminium Oxygen Q Lights up Nothing Nothing R Does not light up Nothing Nothing S Lights up Hydrogen Carbon dioxide Which solutions could be alumina and magnesium nitrate respectively? |
| A. | P and Q |
| B. | R and Q |
| C. | Displacement |
| D. | P is the alumina but no one is magnesium nitrate. |
| Answer» E. | |
| 20. |
Direction: Four substances were tested for their electrical conductivity. The results are shown in the table. Study the table and answer the following questions. Substance Bulb Substance at Cathode Substance at Anode P Lights up Aluminium Oxygen Q Lights up Nothing Nothing R Does not light up Nothing Nothing S Lights up Hydrogen Carbon dioxide In substance Q, bulb lights up but no substance is found either at cathode or at anode, why? |
| A. | Because Q is non-electrolyte. |
| B. | Because Q is an element which remains unchanged when it conducts electricity. |
| C. | Osmosis |
| D. | Because Q is a poor conductor of electricity. |
| Answer» C. Osmosis | |
| 21. |
What is the principle involved in the glowing of an electric bulb? |
| A. | Magnetic effect of current |
| B. | Heating effect of current |
| C. | Decomposition |
| D. | Conduction of current |
| Answer» C. Decomposition | |
| 22. |
Why is the switch for any electrical appliance in ac circuit always connected to the live wire? |
| A. | No current flows in the neutral wire. |
| B. | There will be a short circuit if the switch is in the Earth lead. |
| C. | The substance is a neutral substance. |
| D. | The device can be isolated (mode safe) if the switch is in the live lead. |
| Answer» E. | |
| 23. |
Adding common salt to distilled water makes it |
| A. | Good conductor |
| B. | Insulator |
| C. | The substance is a neutral substance. |
| D. | None of these |
| Answer» B. Insulator | |
| 24. |
Electrolysis of a solution of sodium chloride produces |
| A. | Hydrogen gas at anode and chlorine at cathode |
| B. | Hydrogen gas at cathode, chlorine at anode and sodium hydroxide |
| C. | Water |
| D. | Chlorine gas at anode and sodium hydroxide at cathode. |
| Answer» C. Water | |
| 25. |
Nichrome is an alloy. Which of the following metals make up this alloy? |
| A. | Nickel and chromium |
| B. | Nitrogen and chromium |
| C. | Lactic acid |
| D. | Nickel, chromium and manganese |
| Answer» B. Nitrogen and chromium | |
| 26. |
In a dry cell, which of the following acts as the positive terminal? |
| A. | Carbon rod |
| B. | Manganese dioxide |
| C. | Tartaric acid |
| D. | A metal cap on the carbon rod |
| Answer» E. | |
| 27. |
The process of depositing a thin layer of desired metal over a metal object with the help of electric current is called? |
| A. | Combination |
| B. | Electroplating |
| C. | Sodium carbonate |
| D. | All the above |
| E. | None of these |
| Answer» C. Sodium carbonate | |
| 28. |
Choose the correct option for the given figure. |
| A. | (a - incident ray), (b - normal ray), (c - reflected ray), (d - angle of incidence) |
| B. | (a - reflected ray), (b - incident ray), (c - normal ray), (d -angle of reflection) |
| C. | \[KOH+HCl\xrightarrow{{}}KCl+{{H}_{2}}O\] |
| D. | (a - angle of incidence), (b - normal ray), (c - reflected ray), (d - incident ray) |
| E. | None of these |
| Answer» D. (a - angle of incidence), (b - normal ray), (c - reflected ray), (d - incident ray) | |
| 29. |
Which of the following is correct for electroplating a metal X with copper through electrolyses? |
| A. | Metal X-Anode |
| B. | Copper-Cathode |
| C. | Acids react with certain metals to form hydrogen gas. |
| D. | All the above |
| E. | None of these |
| Answer» D. All the above | |
| 30. |
An instrument which works by producing multiple reflections from plane mirrors and forms beautiful patterns is: |
| A. | Periscope |
| B. | Telescope |
| C. | (i - B), (ii - A), (iii - D), (iv - C) |
| D. | Pinhole camera |
| E. | None of these |
| Answer» D. Pinhole camera | |
| 31. |
Number of images formed is three when two plane mirrors are inclined at angle of: |
| A. | (a)\[{{60}^{o}}\] |
| B. | \[{{30}^{o}}\] |
| C. | Ammonium hydroxide |
| D. | \[{{25}^{o}}\] |
| E. | None of these |
| Answer» D. \[{{25}^{o}}\] | |
| 32. |
Rajan wants to deposit a layer of silver metal on a steel spoon then match the following according to the above statement. Column A Column B (i) Silver [A] Cathode (ii) Steel [B] Electroplating (iii) Silver cyanide solutions [C] Anode (iv) Process [D] Electrolyte |
| A. | (i-C), (ii-D), (iii-B), (iv-A) |
| B. | (i-C), (ii-A), (iii-D), (iv-B) |
| C. | \[{{H}_{2}}S\] is the reducing agent in [A], \[HCl\] is the oxidising agent in [B]. |
| D. | (i-A), (ii-B), (iii-C), (iv-D) |
| E. | None of these |
| Answer» C. \[{{H}_{2}}S\] is the reducing agent in [A], \[HCl\] is the oxidising agent in [B]. | |
| 33. |
Hypermetropia can be corrected by using: |
| A. | Concave lens |
| B. | Convex lens |
| C. | A substance which causes removal of oxygen from substances is called oxidizing agent. |
| D. | Concavo - convex lens |
| E. | None of these |
| Answer» C. A substance which causes removal of oxygen from substances is called oxidizing agent. | |
| 34. |
In electroplating the metal on which electroplating is to be done is made the: |
| A. | Anode |
| B. | Cathode |
| C. | \[Zn\] |
| D. | Electric cell |
| E. | None of these |
| Answer» C. \[Zn\] | |
| 35. |
Radhika is standing at a distance of 10 cm from the plane mirror, how far should she move so that the distance between her and her image will become 10 cm. |
| A. | 10 cm towards the mirror. |
| B. | 5 cm away from the mirror. |
| C. | A - redox, B - combination, C - displacement, D - decomposition. |
| D. | 10 cm away from the mirror. |
| E. | None of these |
| Answer» D. 10 cm away from the mirror. | |
| 36. |
_____ is an apparatus used to produce a thin beam of light. |
| A. | Microscope |
| B. | Telescope |
| C. | displacement reaction |
| D. | Pin-hole camera |
| E. | None of these |
| Answer» D. Pin-hole camera | |
| 37. |
Electrode connected to negative terminal of the battery is a/an: |
| A. | Electrolyte |
| B. | Anode |
| C. | \[CuS{{O}_{4}}\] is ionized |
| D. | Cell |
| E. | None of these |
| Answer» D. Cell | |
| 38. |
Which one of the following is an effect produced by electric current? |
| A. | Heating effect |
| B. | Chemical effect |
| C. | It conducts charge without dissociating. |
| D. | All the above |
| E. | None of these |
| Answer» E. None of these | |
| 39. |
A bulb placed in the electric circuit in the given experimental set-up does not glow because: |
| A. | The liquid used in the above experiment may be a strong electrolyte. |
| B. | The liquid used in the above experiment may not be conducting electricity. |
| C. | Acids are bad conductors of electricity. |
| D. | Both [b] and [c] |
| E. | None of these |
| Answer» E. None of these | |
| 40. |
Which one of the following is a weak electrolyte? |
| A. | \[HCl\]solution |
| B. | Citric acid solution |
| C. | Both (A) and (B) |
| D. | \[Cu\,S{{O}_{4}}\]solution |
| E. | None of these |
| Answer» D. \[Cu\,S{{O}_{4}}\]solution | |