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Test: Chemical Effects of Electric Current- 1 - UPSC MCQ


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20 Questions MCQ Test Science & Technology for UPSC CSE - Test: Chemical Effects of Electric Current- 1

Test: Chemical Effects of Electric Current- 1 for UPSC 2024 is part of Science & Technology for UPSC CSE preparation. The Test: Chemical Effects of Electric Current- 1 questions and answers have been prepared according to the UPSC exam syllabus.The Test: Chemical Effects of Electric Current- 1 MCQs are made for UPSC 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Chemical Effects of Electric Current- 1 below.
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Test: Chemical Effects of Electric Current- 1 - Question 1

What type of water is a poor conductor of electricity?

Detailed Solution for Test: Chemical Effects of Electric Current- 1 - Question 1
Distilled water is a poor conductor of electricity because it lacks the dissolved salts and minerals that are present in natural water sources, which contribute to its conductivity.
Test: Chemical Effects of Electric Current- 1 - Question 2

What precaution should be taken when testing various liquids with the tester?

Detailed Solution for Test: Chemical Effects of Electric Current- 1 - Question 2
When testing various liquids with the tester, ensure that the ends of the tester do not touch each other to avoid short-circuiting and to accurately test the conductivity of the liquid.
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Test: Chemical Effects of Electric Current- 1 - Question 3

When electric current is passed through the copper sulfate solution, copper sulfate dissociates into copper and __________.

Detailed Solution for Test: Chemical Effects of Electric Current- 1 - Question 3
When electric current flows through the copper sulfate solution, copper sulfate breaks down into copper and sulfate. Sulfate is like a buddy that goes along with copper when electricity is passing through.
Test: Chemical Effects of Electric Current- 1 - Question 4
What can be concluded if bubbles of gas form on the electrodes when an electric current passes through a conducting solution?
Detailed Solution for Test: Chemical Effects of Electric Current- 1 - Question 4
If bubbles of gas form on the electrodes when an electric current passes through a conducting solution, it indicates that a chemical reaction is occurring, a common effect of electric current through a solution.
Test: Chemical Effects of Electric Current- 1 - Question 5
What is the process of depositing a layer of metal on another material using electricity called?
Detailed Solution for Test: Chemical Effects of Electric Current- 1 - Question 5
Electroplating is the process of depositing a layer of any desired metal on another material by means of electricity. This is used to enhance properties like corrosion resistance and appearance.
Test: Chemical Effects of Electric Current- 1 - Question 6

Chromium is used to give objects a shiny appearance because it ________.

Detailed Solution for Test: Chemical Effects of Electric Current- 1 - Question 6

Chromium is used to make objects shiny because it resists scratches well. This means that objects coated with chromium can stay looking shiny and new for a long time without getting easily scratched.

Test: Chemical Effects of Electric Current- 1 - Question 7
What should be done if the bulb still does not glow after checking connections and replacing the bulb?
Detailed Solution for Test: Chemical Effects of Electric Current- 1 - Question 7
If the bulb still does not glow after ensuring connections are tight and replacing the bulb, the next step is to replace the cells with fresh cells, as used-up cells may not provide enough power.
Test: Chemical Effects of Electric Current- 1 - Question 8

When electrodes are immersed in water and electricity is passed, the bubbles formed on the positive terminal is actually _______ gas.

Detailed Solution for Test: Chemical Effects of Electric Current- 1 - Question 8

When electrodes are immersed in water and electricity is passed through it, water undergoes electrolysis. The water molecules are split into hydrogen and oxygen gases. The hydrogen gas is released at the negative terminal (cathode), and the oxygen gas is released at the positive terminal (anode). Therefore, the bubbles formed on the positive terminal are oxygen gas.

Test: Chemical Effects of Electric Current- 1 - Question 9
What component can be used in place of a bulb to detect a weak current in the tester?
Detailed Solution for Test: Chemical Effects of Electric Current- 1 - Question 9
An LED can be used in place of a bulb to detect a weak current because LEDs can glow with even a small current.
Test: Chemical Effects of Electric Current- 1 - Question 10

Which of the following liquid is good conductor of electricity?

Detailed Solution for Test: Chemical Effects of Electric Current- 1 - Question 10

Sea water contains small quantity of salt that allow the flow of electric current through them. Distilled water, alcohol and sugar solution do not contain ions or charge particles.

Test: Chemical Effects of Electric Current- 1 - Question 11
Why is chromium plating preferred over making objects entirely out of chromium?
Detailed Solution for Test: Chemical Effects of Electric Current- 1 - Question 11
Chromium plating is preferred over making objects entirely out of chromium because chromium is expensive. Plating provides the desired properties without the high cost.
Test: Chemical Effects of Electric Current- 1 - Question 12
What should be checked first if the bulb in the tester does not glow when the circuit is completed?
Detailed Solution for Test: Chemical Effects of Electric Current- 1 - Question 12
If the bulb does not glow when the circuit is completed, the first thing to check is the tightness of all connections. Loose connections can prevent the circuit from being completed, causing the bulb to not glow.
Test: Chemical Effects of Electric Current- 1 - Question 13

In LEDs, the longer lead (wire) is always connected to the _______ terminal

Detailed Solution for Test: Chemical Effects of Electric Current- 1 - Question 13

In LEDs, the longer lead (wire) is always connected to the positive terminal. This is because LEDs are diodes, and they only allow current to flow in one direction. The longer lead is the anode (positive terminal), and the shorter lead is the cathode (negative terminal).

Test: Chemical Effects of Electric Current- 1 - Question 14

The substance through which current can flow easily are called

Detailed Solution for Test: Chemical Effects of Electric Current- 1 - Question 14

The substance through which electric current can flow easily are called good conductor of electricity. Metals are good conductor of electricity.

Test: Chemical Effects of Electric Current- 1 - Question 15
Why might the bulb not glow even if the liquid is conducting electricity?
Detailed Solution for Test: Chemical Effects of Electric Current- 1 - Question 15
The bulb may not glow even if the liquid is conducting electricity because the current might be too weak to heat the filament sufficiently to make it glow.
Test: Chemical Effects of Electric Current- 1 - Question 16
Why is it advised not to handle electrical appliances with wet hands or while standing on a wet floor?
Detailed Solution for Test: Chemical Effects of Electric Current- 1 - Question 16
It is advised not to handle electrical appliances with wet hands or while standing on a wet floor because water is a good conductor of electricity, increasing the risk of electric shock.
Test: Chemical Effects of Electric Current- 1 - Question 17

What happens when an electric current passes through a conducting solution?

Detailed Solution for Test: Chemical Effects of Electric Current- 1 - Question 17
  • When electricity flows through a liquid that can conduct it, interesting things can happen.
  • Bubbles of gas might pop up, you might see some shiny metal appear, and even the color of the liquid can change.
  • So, when an electric current passes through a conducting solution, it can make bubbles, create metal bits, and even change colors!
Test: Chemical Effects of Electric Current- 1 - Question 18
Why are tin cans used for storing food made by electroplating tin onto iron?
Detailed Solution for Test: Chemical Effects of Electric Current- 1 - Question 18
Tin cans used for storing food are made by electroplating tin onto iron because tin is less reactive than iron, preventing the food from reacting with the iron and getting spoilt.
Test: Chemical Effects of Electric Current- 1 - Question 19
What causes a compass needle to deflect when electric current flows through a wire wrapped around it?
Detailed Solution for Test: Chemical Effects of Electric Current- 1 - Question 19
A compass needle deflects when electric current flows through a wire wrapped around it due to the magnetic effect of the current, which creates a magnetic field.
Test: Chemical Effects of Electric Current- 1 - Question 20
Why is the longer lead of an LED connected to the positive terminal of the battery?
Detailed Solution for Test: Chemical Effects of Electric Current- 1 - Question 20
The longer lead of an LED is connected to the positive terminal of the battery due to the LED's polarity, which must be correctly oriented to allow current to flow.
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