What are incandescent bulbs?

Bulbs with light emitting diodes

What is an electromagnet based on ?

Magnetic effect of electric current

Electro-chemical effect of current

A circuit made of wires, a lamp, a switch, and a cell is shown at the right. What change is needed for the lamp to glow?

The wire needs to be connected to the bottom of the cell.

Which property of wood makes it a good material for the handle on a cooking tool?

Wood does not conduct electricity well.

How is electric potential measured

It cannot be measured= infinity

Boojho made an electromagnet by winding 50 turns of wire over an iron screw. Paheli also made an electromagnet by winding 100 turns over a similar iron screw. Which electro magnet will attract more pins? Give reason

Paheli-Because more number of turns has more electromagnet power

Boojho-Because less number of turns has more electromagnet power

Paheli does not have a night lamp in her room. She covered the bulb of her room with a towel in the night to get dim light. Has she taken the right step? Give one reason to justify your answer

No,Towel may be heated and burn

Yes,It will make the room more brighter

Yes,Good students always do such practicals

Which of the following precautions need not be taken while using electric gadgets/appliances/circuit?

We should never turn the switch in ON position

We should never touch a lighted electric bulb connected to the mains.

We should never experiment with the electric supply from the mains or a generator or an inverter.

We should never use just any wire or strip of metal in place of a fuse.

What is your inference from the diagram

Strength of magnetic field depend on number of coils

Strength of magnetic field depend on current

Strengh of magnetic field depend on type of core

How are electromagnets different from magnets?

you can turn an electromagnet on/off

magnets have a North and South pole

Electromagnets are useful in industry such as a junk yard because they

have strong north and south poles

Electric current and its effect

Quiz

•

Science

•

7th Grade

•

Practice Problem

•

Medium

•

NGSS

HS-PS2-5, MS-PS2-3, 4-PS3-2

+2

Standards-aligned

Dixita Patel

Used 142+ times

FREE Resource

34 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

1.An electric current can produce

heating effect only.

chemical effect only.

magnetic effect only.

chemical, heating, and magnetic effects.

Which one of the following solutions will not conduct electricity?

lemon juice

vinegar

tap water

vegetable oil

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Small amount of a mineral salt present naturally in water makes it a______________ of electricity.

insulator

conductor

both a and b

none of these

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

An electrolyte is

a metal

a solution

a liquid that conducts current

all of above

Flow of electron is called

Electroplating

Electric current

Electrodes

Electrolyte

What is this?

Battery

Electromagnet

Soleoid

Solenoid

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What does a fuse do?

Melt down for no reason.

Stop electricity

Stop excessive electricity

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Electric current and its effect

34 questions

1.An electric current can produce

Which one of the following solutions will not conduct electricity?

Small amount of a mineral salt present naturally in water makes it a______________ of electricity.

An electrolyte is

Flow of electron is called

What is this?

What does a fuse do?

What are incandescent bulbs?

What is the full form of the ISI mark?

Who developed the ISI mark?

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