Question 11 Mark
What are the two kinds of charges?
Answer
View full question & answer→The two kinds of charges are
$1.$ Negative charge
$2.$ Positive charge
$1.$ Negative charge
$2.$ Positive charge
Questions
[1 Mark Question Answer]
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22 questions · timed · auto-graded
Question 21 Mark
Name two substances which can be charged by friction.
Answer
View full question & answer→Two substances which can be charged by friction are
$1.$ Glass.
$2.$ Ebonite.
$1.$ Glass.
$2.$ Ebonite.
Question 31 Mark
When a charged rod is touched with the disc of a positively charged gold-leaf electroscope, it is observed that the divergence of leaves decreases. What is the kind of charge on the rod?
Answer
View full question & answer→As on touching the disc with the charged rod, divergence in the leaves decreases, this means the rod has opposite kind of charge than leaves i.e. rod has a negative charge.
Question 41 Mark
A negatively charged ebonite rod is touched with the disc of a negatively charged gold leaf electroscope. What will be your observation?
Answer
View full question & answer→Divergence of leaves will increase because similar charge will increase.
Question 51 Mark
Who discovered the way of producing electricity by friction?
Answer
View full question & answer→The ancient Greek philosopher Thales of Miletus discovered the electricity by friction.
Question 61 Mark
Can you charge an insulator by the method of conduction?
Answer
View full question & answer→No, we cannot charge an insulator by the method of conduction.
Question 71 Mark
Why does a plastic comb rubbed with dry hair attract bits of paper?
Answer
View full question & answer→Plastic comb rubbed with dry hair gets electrically charged and therefore it attracts the bits of paper.
Question 81 Mark
Name the way of charging a conductor in which the charge is shared.
Answer
View full question & answer→By conduction is the way of charging a conductor in which the charge is shared.
Question 91 Mark
What do you understand by electricity at rest?
Answer
View full question & answer→When the charges are not allowed to flow are termed as static electricity, i.e., the electricity at rest.
Question 101 Mark
What are free electrons?
Answer
View full question & answer→FREE ELECTRONS. Electrons of the outermost orbit of a solid, which can easily leave the atom and become free to move inside the solid are called FREE ELECTRONS
Question 111 Mark
What is the net charge on an atom?
Answer
View full question & answer→Net charge on an atom is zero i.e. atom is neutral.
Question 121 Mark
The diagram below in figure shows the reading on the dials of a meter. State what is its reading.
Answer
View full question & answer→The reading is $2\ 7\ 8\ 9$
Question 131 Mark
How can you check just by seeing the meter whether the electricity is in use or not?
Answer
View full question & answer→If the electricity is in use, the counter fixed on the armature of the meter rotates and reads the number of rotations
$($A red mark is seen rotating$)$.
$($A red mark is seen rotating$)$.
Question 141 Mark
For which unit do we pay our electricity bill?
Answer
View full question & answer→$\text{UNIT}$ is a board of trade unit which is $\text{kWh} ($Kilowatt per hour$) = 1000 W$ used in $1$ hour.
Question 151 Mark
State the purpose of $\text{kWh}$ meter.
Answer
View full question & answer→Purpose of $\text{kWh}$ meter is to measure the electric energy consumed in $\text{kWh}$ for which the electricity bill is to be paid. i.e. units of energy consumed.
Question 161 Mark
State the voltage at which electricity is supplied to our houses.
Answer
View full question & answer→Electricity voltage is supplied to our houses at $220$ volts in India and $120$ volts in the $\text{USA}.$
Question 171 Mark
From where does the electricity come to our home ?
Answer
View full question & answer→In our homes electricity comes from the CITY SUBSTATION.
Question 181 Mark
With which wire: live or neutral is the fuse wire connected?
Answer
View full question & answer→Fuse is connected with LIVE WIRE.
Question 191 Mark
Write the full form of $\text{M.C.B}$ ?
Answer
View full question & answer→Miniature Circuit Breaker
Question 201 Mark
Name the material of a fuse wire.
Answer
View full question & answer→The material used in fuse wire is an ALLOY of LEAD $(50\%)$ and TIN $50\%$ having low $\text{M.P}$. of $200^\circ C$
Question 211 Mark
State one property of the material of a fuse wire.
Answer
View full question & answer→Two CHARACTERISTICS OF FUSE WIRE are:
$(i)$ Has LOW MELTING POINT.
$(ii)$ Has HIGH RESISTANCE.
$(i)$ Has LOW MELTING POINT.
$(ii)$ Has HIGH RESISTANCE.
Question 221 Mark
If an appliance of power $P$ watt is used for time $t$ hour. How much electrical energy is consumed in $\text{kWh}$?
Answer
View full question & answer→Power $P =\frac{w}{t}=$ Electrical energy
$\therefore$ Electrical energy $= P \times t$
$\therefore$ Electrical energy $= P \times t$