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question_answer1)
In the given figure, electrolyte, anode and cathode respectively are
A)
A, B and C done
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B)
B, A and C done
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C)
B, C and A done
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D)
A, C and B done
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question_answer2)
In which of the following will the bulb glow?
A)
B)
C)
D)
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question_answer3)
In which one of the following situations does a conventional electric current flow due north?
A)
Protons in a beam are moving due south. done
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B)
A water molecule is moving due north. done
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C)
Electrons in a beam are moving due south. done
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D)
None of these done
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question_answer4)
The diagram shows a beaker containing a solution of zinc sulphate and two carbon electrodes. A battery is placed next to it. In order that the electrode P be plated with zinc,
A)
P must be connected to S and Q to R done
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B)
P must be connected to Q and S to R done
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C)
P must be connected to R and Q to S done
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D)
P and Q must be connected to R. done
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question_answer5)
In the experiment, if A is plated with copper, the anode would be
A)
A done
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B)
B done
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C)
C done
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D)
Data insufficient done
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question_answer6)
When electricity is passed through calcium nitrate solution in water, what is likely to be formed at the cathode and why?
A)
Hydrogen because it is a very reactive than calcium done
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B)
Calcium because it is a very reactive than hydrogen done
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C)
Hydrogen because it is less reactive than calcium done
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D)
Calcium because it is less reactive than hydrogen. done
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question_answer7)
An electric current is passed through a conducting solution. Following are the some observations:
(i) Deposits of metal may be seen on electrodes |
(ii) Solution may get heated |
(iii) Bubbles of gas may be formed on the electrodes |
A)
Only (ii) is true. done
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B)
Only (i) and (ii) are true. done
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C)
Only (i) and (iii) are true. done
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D)
All (i), (ii) and (iii) are true. done
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question_answer8)
In the given figure, the filter paper contains starch soaked in potassium iodide solution is connected to the battery as shown. When we write on the wet paper, it has a blue black colour.
(i) Iodine is formed at the anode. |
(ii) Iodine turns blue black in the presence of starch. |
A)
Only (i) is correct. done
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B)
Only (ii) is correct. done
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C)
Both (i) and (ii) are correct. done
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D)
Neither (i) nor (ii) is correct. done
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question_answer9)
Which of the following statements is incorrect?
A)
Anode is an electrode connected to the positive terminal of the battery. done
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B)
Pure water is poor conductor of electricity. done
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C)
Electrolysis is used in the refining of impure metals. done
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D)
Ions can have only a positive charge. done
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question_answer10)
Which of the following is correct?
A)
Water can be used for extinguishing fires caused due to electrical faults. done
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B)
Carbon is a non-metal so it cannot be used in electrolytic cell. done
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C)
A liquid conducts electricity because of the presence of ions. done
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D)
Pure water forms ions to conduct electricity. done
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question_answer11)
Which of the following cells use(s) electric current to produce a chemical reaction?
A)
Dry cell done
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B)
Solar cell done
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C)
Electrolytic cell done
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D)
Both dry cell and electrolytic cell done
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question_answer12)
Electrolysis of a solution of sodium chloride produces
A)
Hydrogen gas at anode and chlorine at cathode done
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B)
Hydrogen gas at cathode, chlorine at anode and sodium hydroxide done
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C)
Hydrogen gas at anode and sodium hydroxide at cathode done
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D)
Chlorine gas at anode and sodium hydroxide at cathode. done
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question_answer13)
Adding common salt to distilled water makes it
A)
Good conductor done
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B)
Insulator done
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C)
Can't say done
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D)
None of these done
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question_answer14)
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. done
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B)
There will be a short circuit if the switch is in the Earth lead. done
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C)
The device can be switched off easily if the switch is in the neutral lead. done
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D)
The device can be isolated (mode safe) if the switch is in the live lead. done
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question_answer15)
To protect iron from corrosion and rust, it is coated with
A)
Tin done
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B)
Copper done
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C)
Mercury done
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D)
Zinc. done
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question_answer16)
There are two different solutions in set up P and Q as shown in figure. The bulb in the set up P glows more brightly as compared to that of the set up Q. What are the possible causes for this?
(i) The connections of the circuit Q may be loose. |
(ii) The liquid in Q may have small conductivity. |
(iii) Liquid in P is equivalent to a battery while liquid in Q is equivalent to a cell of the battery of liquid P. |
A)
Only (i) and (ii) done
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B)
Only (ii) and (iii) done
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C)
Only (i) done
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D)
Only (ii) done
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question_answer17)
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. done
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B)
Because Q is an element which remains unchanged when it conducts electricity. done
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C)
Because Q is an electrolyte that conducts electricity when it is in the molten state. done
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D)
Because Q is a poor conductor of electricity. done
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question_answer18)
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 done
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B)
R and Q done
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C)
P and S done
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D)
P is the alumina but no one is magnesium nitrate. done
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question_answer19)
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)
B)
C)
D)
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question_answer20)
The diagram shows a plotting compass placed above a copper wire when there is no current flowing in the wire. What happens to the compass needle when a large direct current flows from point A to point B?
A)
The compass needle points towards the right. done
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B)
The compass needle points towards the left. done
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C)
The compass needle points towards upward. done
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D)
The compass needle points toward downward. done
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