Q1) True or false
A current-carrying coil, when suspended freely, can rest in any direction :
A coil carrying current behaves like a magnet :
In an electromagnet, the core is made up of copper :
An electric bell uses an electromagnet :
An electromagnet with the soft iron core is a temporary magnet :
We use cells as the source of electricity to run an electric immersion rod. :
A torch bulb glows if the terminals of the bulb are connected to the terminals of a cell by the metallic wire. :
Wool is a conductor of electricity :
Silver is an insulator of electricity :
Our body is a conductor of electricity :
For a circuit to be complete, every part of it must be made up of conductors :
All metals are conductors of electricity :
The switch should not to be touched with wet hands :
A switch is an on-off device in an electric circuit. :
Q2) Fill in the blanks
Q3) Match the following.
|Column A||Column B|
|Human body||i) Electric Bell|
|Silk thread||ii) Current|
|Charge in motion||iii) Conductor|
|Soft iron||iv) Electromagnet|
a) A freely suspended magnet rests in
b) Electromagnets are made up of
c) An electromagnet is used in
d) The purpose of armature in an electric bell is
To make and break the circuit
To produce sound
To produce magnetic field
To provide spring action
e) In a torch, the source of electricity is
f) Electricity can flow through
g) Electricity does not flow through
h) We should not touch the switch with wet hands otherwise
Electricity may pass through our body
Electricity may not pass through the appliance
Circuit may break
The switch may get off
Q4) YOu are given two similar bars. One is a magnet and the other is of soft iron. How will you distinguish and identify them?
Q6) Describe a simple experiment to illustrate that like poles of two magnets repel each other while the, unlike poles, attract.
Q12) Draw a labelled diagram to make a soft iron bar as an electromagnet. Describe in steps the procedure.
Q13) You are given a U shaped soft iron piece, insulated copper wire and a battery. Draw a circuit diagram to make a horseshoe electromagnet.
Q19) THe incomplete diagram of an electric bell is given in the figure. Complete the diagram and the label it's different parts
Q20) What is a declination? Draw a diagram to show the angle between the declination and true direction of geographic north/
Q26) Describe an experiment to show that electricity flows only if the circuit is complete and it does not flow if the circuit is incomplete.
Q27) You are provided with a torch bulb, a cell and two plastic-coated f metal wires. Draw a diagram to show a complete circuit to light the bulb.
Q28) In which of the following case the bulb will glow:
Only one terminal of a cell is joined with a metal wire to one terminal of the bulb.
Both terminal of the bulb is joined with two metal wires to one terminal of the cell.
One terminal of the cell is joined to one terminal of the bulb and other terminal of the cell to the other terminal of the bulb.
Q30) Select conductors and insulators from the following:
Glass, silver, copper, wood, paper, pure water, impure water, aluminium, iron, leather, plastic, steel, human body and ebonite.
Q31) The following diagram shows four circuits A, B, C and D. Each circuit has a cell and a torch bulb. Name the circuits in which the bulb will glow? Give reason to your answer.
Q32) The diagram given below shows a bulb connected with a cell having terminals A and B. Mark the direction of current in the bulb.
Q33) State the function of each of the following in an electric circuit and draw its symbolic representation: Switch and Cell
Q34) Draw a circuit diagram for a bulb connected to a cell with a switch. Mark arrow in the diagram to indicate the direction of flow of current.
Q35) In which arrangement are the appliances connected in the electric circuit of out homes, Series or parallel? Give reasons
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