ELECTRIC CURRENT AND IT'S EFFECT

Q1. If in a circuit diagram containing a cell and nichrome wire tied between two nails, the cell is replaced by a battery then what will happen to the nichrome wire?

• A)It gets red hot slowly.

• B)No change in the temperature take place.

• C)It will get red hot quickly.

• D)The wire will break due to increase in strength of current.

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4

Q2. Why Nichrome is used for making wires of heating coils?

• 1.High melting point and low resistivity.

• 2.Low resistivity and high melting point.

• 3.High resistivity and high melting point.

• 4. It can get oxidised easily and have high melting point

Tags

NGSS.MS-PS3-3

Q3. Which among the following are the advantages of heating effect of current?

• 1.Can be used in electric fuse

• 2.Increases the life of several appliances in the circuit.

• 3.It helps in preventing loss of energy.

Tags

NGSS.MS-PS1-4

Q4. Which among the following is the diadvantage of heating effect of current?

• 1.It can break the insulation of wires/ devices.

• 2.It prevents energy loss.

• 3.It is used in working of electric fuse.

Q5. Tungsten is used for the manufacture of an electric bulb because

• A)it is malleable

• B) it is inexpensive

• C) it has a very high melting point

• D) it is a good conductor

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4

Q6. Current in an electric circuit can exceeds it’s maximum limit when,

• 1.One device is connected to the socket.

• 2.Touching of two neutral wires.

• 3.Insulation break down.

• 4.Touching of two live wires.

Q7. Current in an electric circuit increased it’s maximum limit when live wire and neutral wire touches each other due to wear and tear of the wires over a period of time. This phenomenon is known as:

• 1.Over loading.

• 2.Short- circuit.

• 3.Magnetic effect of current.

• 4.Heating effect of current.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

Q8 .The acting contacts for circuit breakers are made of

• A) Stainless steel

• B) Hard pressed carbon

• C) Porcelain

• D) Copper tungsten alloy

Q9. Melt down limit of a fuse wire does not depend on:

• 1. Current rating of the fuse wire.

• 2. Length of the wire

• 3. Melting point of the wire.

• 4. Resistivity of the wire.

Q10. Select the one that you will prefer to make an electromagnet.

• A) Steel

• B) Plastic

• C) Stainless steel

• D) Soft iron

Tags

NGSS.MS-PS2-5