Tag: physics

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Questions Related to physics

Multiple choice physics electrical conductivity of liquids does liquid conduct electricity? liquids conduct electricity do liquids conduct electricity?

Which solution will conduct the current?

  1. Sugar in water

  2. Sugar in ethanol

  3. Iodine in ethanol
  4. $MgCl _2$ in water
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In water magnesium chloride ionizes to form ions and these ions conduct electricity. Sugar and iodine are non electrolytes. They do not dissociate into ions in aqueous solution. Hence, they do not conduct electricity.

Multiple choice physics electrical conductivity of liquids does liquid conduct electricity? liquids conduct electricity do liquids conduct electricity?

Which statements about conductivity of distilled water are correct?

  1. It possesses almost non-conducting nature

  2. It is obtained by distillation of water several times

  3. It is contaminated with little acid

  4. None of the above
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation

Water is a weak electrolyte and is almost non conducting in nature as hardly any ions are present in pure water. However if impurities are present, then the conductivity will be high. In order to obtain the true value of the conductivity of water, these ions are removed by distilling the water several times. 

Multiple choice physics electrical conductivity of liquids does liquid conduct electricity? liquids conduct electricity do liquids conduct electricity?

Which of the following statements is false?

  1. Vegetables conduct electricity

  2. Passage of electric current will not change the colour of a solution

  3. An electrode conducts electricity

  4. Electroplating is one of the applications of chemical effects of electrical current
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Passage of electric current may change the colour of a solution.
When an electric current is passed through a solution, a chemical reaction occurs. During this chemical reaction, coloured salts may form or may be consumed. This results in colour change for the solution.

Multiple choice physics electrical conductivity of liquids does liquid conduct electricity? liquids conduct electricity do liquids conduct electricity?

What happens when you join the free ends of the tester for more than a few minutes?

  1. Cells of the battery will drain quickly.

  2. The current will not be able to pass.

  3. There would be no conduction of electricity.

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

While checking, your tester does not join its free ends for more than a few seconds. Otherwise, the cells of the battery will drain very quickly.

Multiple choice physics electrical conductivity of liquids does liquid conduct electricity? liquids conduct electricity do liquids conduct electricity?

Which of the following statement is correct while conduction of electricity in lemon juice?

  1. The liquid (lemon juice) allows the electric current to pass through. Hence, the circuit of tester is complete.

  2. The current flows in the circuit of the tester.

  3. The bulb glows which indicates lemon juice is a good conductor of electricity.

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When the liquid (lemon juice) between the two ends of the tester allows the electric current to pass, the circuit of the tester becomes complete. The current flows in the circuit and the bulb glows indicating that lemon juice is a good conductor of electricity.

Multiple choice physics electrical conductivity of liquids does liquid conduct electricity? liquids conduct electricity do liquids conduct electricity?

Which of the following devices can be used to detect a weak current?

  1. Use of electric bulb in tester.

  2. Use of LED in tester.

  3. A tester using magnetic effects of current.

  4. Both B and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

LED glows even when a weak electric current flows through it. Also, even if the current is small, the deflection of the magnetic needle can be seen. Hence, tester using LED and magnetic effects of current can be used to detect a weak current.