Tag: physics

Quizzes (598) Questions (13441)

Questions Related to physics

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

When salt is dissolved in distilled water, we obtain salt solution which is a / an :

  1. conductor of electricity

  2. insulator of electricity

  3. motor of electricity

  4. filament of electricity
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When salt is dissolved in distilled water, we obtain salt solution. This is a 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 might be the reason that the current in the circuit is weak?

  1. Circuit of the tester might not be complete.

  2. The material may not be able to conduct electricity as easily as metals.

  3. The circuit of the tester is complete but still the bulb does not glow.

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

Though a material may conduct electricity, it may not conduct it as easily as a metal. As a result, the circuit of the tester may be complete and yet the current through it may be too weak to make the bulb glow.

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

Which of the following is not true about LED?

  1. There are two wires (called leads) attached to an LED.

  2. While connecting to a circuit, the longer lead of LED is always connected to the positive terminal of the battery.

  3. While connecting to a circuit, the shorter lead of LED is always connected to the positive terminal of the battery.

  4. LED can be used to detect weak current.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

While connecting to a circuit, the longer lead is always connected to the positive terminal of the battery and the shorter lead is connected to the negative terminal of the battery.

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

Which of the following would show deflection in the compass needle, the moment you dip the free ends of the tester?

  1. Tap water, vinegar

  2. Tap water, vegetable oil

  3. Tap water, honey

  4. Vegetable oil, honey
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Tap water and vinegar are good conductors of electricity and hence, the compass needle could show deflection.

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

What happens when the current passing through the circuit is too weak?

  1. The filament does not get heated sufficiently and the bulb does not glow.

  2. The filament gets heated but the bulb does not glow.

  3. The filament does not get heated but the bulb glows.

  4. The filament gets heated and the bulb glows.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When the current through the circuit is too weak, the filament does not get heated sufficiently and the bulb does not glow.

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

Which of the following statement(s) is correct while conducting electricity through vegetable oil?

  1. The liquid (vegetable oil) allows the electric current to pass through. Since, it is a good conductor of electricity.

  2. The circuit of the tester is complete but the bulb does not glow.

  3. The circuit of the tester is not complete and hence the bulb does not glow.

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

When the liquid (vegetable oil) does not allow the electric current to pass, the circuit of the tester is not complete and the bulb does not glow.

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

It is not safe to carry out electrical repair works outdoor during rain because :

  1. rainwater is a good conductor of electricity

  2. rainwater contains mineral salts

  3. rainwater is a poor conductor of electricity

  4. both A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

It is not safe to carry out electrical repair works outdoor during rain because it contains small amounts of mineral salts naturally present in it. This water is thus a good conductor of electricity.

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

In LEDs, the longer lead is connected to ................ and the shorter lead is connected to .................. .

  1. negative terminal; positive terminal

  2. positive terminal; negative terminal

  3. negative terminal; neutral terminal

  4. positive terminal; neutral terminal
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In LEDs, the longer lead is connected to the positive terminal and the shorter lead is connected to the negative terminal.