Tia used four different objects to ill the gap in an electric circuit, separately. The table shows what she found. 1. Which of these best conducts electricity? A. Wood B. Plastic C. Copper D. Graphite 2. Which of these is a chemical effect of electric current? A. Glowing of bulb B. Heating of water C. Ringing of mobile phone D. Chromium plating on iron 3. Which of these is a correct pair of an insulator and a conductor? Insulator Conductor A. Aluminium Cotton B. Thermocol Rubber C. Copper Iron D. Wax Aluminium

1. C. Copper 2. D. Chromium plating on iron 3. D. Wax/Aluminium

Tia used four different objects to ill the gap in an electric cir…

The equations below show four chemical reactions.
$(i)$ Copper sulphate $+$ Zinc $\rightarrow$ Zinc sulphate $+$ Copper
$(ii)$ Copper sulphate $+$ Iron $\rightarrow$ Iron sulphate $+$ Copper
$(iii)$ Iron sulphate $+$ Copper $\rightarrow$ no reaction
$(iv)$ Zincsulphate $+$ Copper $\rightarrow$ no reaction
$5.$ What can be concluded from the above reactions$?$
$A.$ Copper is less reactive than both zinc and iron
$B.$ Zinc is less reactive than iron but more reactive than copper
$C.$ Copper is less reactive than zinc but more reactive than iron
$D.$ Iron is less reactive than both zinc and copper
$6.$ Why is example $(i)$ regarded as a displacement reaction? Explain your answer.

→

The picture shows how a part of the Moon $(X)$ is seen as it rotates around the Earth.

$5.$ What is the word used for this type of imaginary igures$?$
$A.$ Galaxy
$B.$ Supernova
$C.$ Constellation
$D.$ Solar System
$6.$ Sirius is twice as large as the Sun.
Why does it appear so small from the Earth$?$

→

The picture shows the life cycle of a moth.

$9.$ What can be concluded from the picture$?$
Circle ‘Yes’ or ‘No’ for the correct response.

Can this be concluded from the picture?	Yes or No
Moth is an oviparous animal.	Yes/No
A moth looks different in each stage of its life cycle.	Yes/No
There are two different stages in the life cycle of a moth.	Yes/No

→

The graph shows the Air Quality Index $(AQI)$ of four different cities.

$8.$ Which city’s air is the most polluted? Explain your answer.
$9.$ The air of only City $1$ and City $3$ are safe for breathing.
What is the AQI limit for safe breathing$?$
$A.$ Less than $50$
$B.$ In between $50$ and $100$
$C.$ In between $100$ and $150$
$D.$ In between $150$ and $200$
$10.$ Which of these steps can help reduce air pollution?
Circle ‘Yes’ or ‘No’ for the correct response.

Can this reduce air pollution?	Yes or No
Planting a large number of trees	Yes/No
Using biofuel as an energy source	Yes/No
Burning of agricultural wastes	Yes/No

→

Peter hammered four balls made of different materials.
He then heated each ball for a minute.
The table below shows what Peter observed.

Ball	What happens to the ball when hammered?	Temperature of the ball when heated for a minute
Ball $1$	Flattens	$85\ ℃$
Ball $2$	Breaks	$45\ ℃$
Ball $3$	Breaks	$35\ ℃$
Ball $4$	Flattens	$75\ ℃$

$3.$ What can be concluded from the table$?$
Circle ‘Yes’ or ‘No’ for each statement

Can this statement be concluded from the table$?$	Yes or No
Materials that break when hammered get heated quickly	Yes/No
Materials that latten when hammered get heated quickly	Yes/No
Materials that break when hammered get heated slowly	Yes/No

$4.$ Two of the four balls are made of ceramic and wood respectively.
Which two balls are they likely to be$?$

→

The table shows two groups of natural resources.

Wildlife Sanctuary	National Park
Protects certain speciic species of animals	Protects all plants, animals, landscape and historical objects
Restricts killing and capturing of animals	Restricts all kinds of disturbances for animals, plants and historical objects
Visitors are allowed without permission	Visitors are allowed only after authorized permission
Found in all types of terrain	Found in all types of terrain

$1.$ Radha visited a protected forest area where she can -
● can collect samples of herbs
● enter at her own will
$2.$ Which of these statements is supported by the table?
$A.$ Mining is allowed in National Parks.
$B.$ Zoo is an example of a Wildlife Sanctuary.
$C.$ National Parks are larger than Wildlife Sanctuaries.
$D.$ Wildlife Sanctuaries are always found in river basins.
$3.$ A tiger Reserve is a forest area where the tiger population is protected.
Why did Indian government declare parts of many forests as Tiger Reserves?
$A.$ Tiger is a mammal.
$B.$ Tiger is our national animal.
$C.$ Tiger is an endangered species.
$D.$ Tiger is the top predator of forest ecosystems.
$4.$ Which of these are the effects of deforestation?
Circle ‘Yes’ or ‘No’ for the correct response.

Is this an effect of deforestation?	Yes or No
Decrease in the fertility of soil	Yes/No
Decrease in the occurrence of floods	Yes/No
Increase in the occurrence of droughts	Yes/No

$5.$ Which of these books keeps a record of all the endangered animals and plants?
$A.$ Red Data Book
$B.$ Blue Data Book
$C.$ White Data Book
$D.$ Green Data Book

→

Which of these is true about the four sound waves$?$
Circle ‘Yes’ or ‘No’ to mark your responses.

Animal	Frequency range of sound waves
Elephant	$15–12000\ Hz$
Human	$20–22000\ Hz$
Dog	$65–45000\ Hz$
Chicken	$125–2000\ Hz$

$5.$ A cat made a purring sound that had a frequency of $35\ Hz.$
Which of the animals mentioned in the table can hear the purring$?$
$A.$ Only human
$B.$ Only elephant
$C.$ Dog and chicken
$D.$ Elephant and human
$6.$ Which of the following sounds can be classiied as noise for humans$?$
$A.$ Sounds that are softer than $20\ dB$
$B.$ Sounds that are in between $20\ dB$ and $40\ dB$
$C.$ Sounds that are between $40\ dB$ and $80\ dB$
$D.$ Sounds that are louder than $80\ dB$
$7.$ Which of these will reduce noise pollution?
Circle ‘Yes’ or ‘No’ to mark your responses.

Will this reduce noise pollution?	Yes or No
Regulating the use of loudspeakers	Yes/No
Setting up more thermal power plants	Yes/No
Using more electric vehicles	Yes/No

→

The picture shows a candle in front of two plane mirrors joined at their sides.

$4.$ What will increase the number of images formed on the mirrors$?$
$A.$ Decrease in the size of the object
$B.$ Increase in the size of the mirrors
$C.$ Decrease in the angle between the two mirrors
$D.$ Increase in the distance between the object and the mirrors

→

Two groups of students are playing tug-of-war.

$2.$ Choose the correct direction of force applied by Group $1$ and Group $2.$

$3.$ Group $1$ is pulling with $250\ N$ force and Group $2$ is pulling with $300\ N$ force.
What would be the likely position of the two groups after a minute of pulling$?$

→

Polaris is a star that always appear at the same point in the night sky.

$7.$ Why does Polaris appear at the same location over time$?$
$A.$ It is a part of our solar system
$B.$ It is too far away from the Earth
$C.$ It is situated along the Earth’s axis
$D.$ It is held in its position by the Earth’s gravity
$8.$ What is Polaris commonly known as$?$

→

Answer

Need a full question paper?

Explore more

Similar questions

	Insulator	Conductor
$A.$	Aluminium	Cotton
$B.$	Thermocol	Rubber
$C.$	Copper	Iron
$D.$	Wax	Aluminium

Chemical Effects of Electric Current — Science STD 8 — Question

Answer

Need a full question paper?

Explore more

Similar questions