Conductor

Q.

Electroplating helps in preventing metals from _______

Q.

Is hair negatively or positively charged? (When hair is rubbed with balloon)

Q.

Iron objects are generally electroplated with?

Q. Assertion (A): An electroscope can be used to find the presence of charge on a body.
Reason (R): It is based on the principle: Like charges repel each other.

1. Both A and R are true and R is the correct explanation of A
2. Both A and R are true but R is not the correct explanation of A
3. A is true but R is false
4. A is false but R is true

Q.

Silver plated vessels and gold plated ornaments are made by ____ method.

Q. An isolated conducting sphere of charge Q and radius R is grounded by using a high resistance wire. What is the amount of heat loss? (a)kq/2R (b)kq/R (c)2kq /R (d)None of above

Q.

What is the process by which a layer of one metal can be deposited on top of another metal? What kind of metals are usually electroplated?
[3 MARKS]

Q.

When current carrying wire behaves like a magnet , it is called _____ effect of the current.

Q.

What is Powder coating and Teflon Coating?

Q.

Fill in the blank.

Like charges_________ each other while unlike ____________ charges each other.

Q.

Does electricity have inertia?

Q.

Which of the following is correct?

Statement 1: Poor conductors do not allow electric current to flow through them.

Statement 2: Poor conductors do not allow electric current to flow through them easily.

Q. 2 plates of a capacitor of capacitance c are given charge q1 and q2 at it =0 switch s is closed heat developed across resistor are over long time is

Q.

For the arrangement shown below, if we want to change the direction in which the magnetic needle gets deflected, then which of the following can be done?

1. Changing the wire's material
2. Changing the cell's polarity
3. Decreasing the voltage
4. Increasing the voltage

Q. Question 6
Which of the following metals is used in electroplating to make objects appear shining?

(a) Iron
(b) Copper
(c) Chromium
(d) Aluminium

Q. What should be the characteristic of a fuse wire?

1. High melting point, high specific resistance
2. Low melting point, low specific resistance
3. High melting point, low specific resistance
4. Low melting point, high specific resistance

Q.

When electric current flows through a metal, it is actually a flow of

___

Q. Which of the following is a characteristic of an insulator?

1. Most important component of an electric circuit
2. None of the above
3. A material in which electric current does not flow freely
4. Allows electricity to flow through them

Q. Write true or false for this statement:
The switch should not be touched with wet hands.

1. false
2. true

Q.

Statement 1: The flow of current in a poor conductor is impossible.

Statement 2: Under certain conditions current can flow through a poor conductor.

1. Both the statements are true and statement 2 is the correct explanation of statement 1.

2. Both the statements are true and statement 2 is not the correct explanation of statement 1.

3. Statement 1 is true and statement 2 is false.

4. Statement 1 is false and statement 2 is true.

Q. For the arrangement shown below, if we want to change the direction in which the magnetic needle gets deflected, then which of the following can be done? (Here AB represents a metallic wire and E represents a battery.)

1. 
   Changing the length of the wire.
2. 
   Increasing the current in the wire.
3. 
   Changing the polarity of the battery.
4. Decreasing the current in the wire.

Q.

An Ebonite rod is Rubbed with fur and becomes ______ charged.

Q.

When electric current is passed through an incandescent bulb, the bulb gives light. Identify the proper reason.

1. Electric effect of current

2. Chemical effect of current

3. Heating effect of current

4. Lighting effect of current

Q. The objects which allow electric current to flow through them easily are known as:

1. Resistors
2. Insulators
3. Radiators
4. Good conductors

Q.

The property of a conductor due to which it opposes the flow of current is known as:

1. Resistance.

2. Conductance.

3. Convection.

4. None of these.

Q. The resistance of some substances become zero at very low temperature. Such substances are called :

1. Good conductors
2. Super conductors
3. Semi conductors
4. Bad conductors

Q. Upon charging by conduction, the mass of a body may :

1. Increase
2. Remain the same
3. Decrease
4. Increase or decrease

Q.

Metals are good conductors of electric current because they have a large number of __.

Q. Poor conductors of electricity can allow electricity to pass through them under certain conditions.

1. False

2. True

Q. On which of the following factor, the direction of deflection of a magnetic needle of a compass depends when the compass is kept near a current carrying wire?