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Class VIII Science Question Bank

Download a good collection of questions from Class 8 Science NCERT Textbook. The collection includes questions requiring Higher order thinking skills (HOTS

Question Bank for VIII Science

Why Rockets have a fixed diameter?

Is it possible to create a rocket with a variable blast diameter to achieve different levels of torque and power similar to a geared transmission?

I suppose the best analogy I have is the difference in power between a garden hose normally and when you plug it with your thumb, creating more pressure.

Would it be possible to have a rocket launch with maximum diameter, and slowly close up like a camera shutter to gain speed once in the air? Perhaps this shudder would be angled like a funnel to direct the blast easier. All the rockets I see have a fixed diameter and it just makes me curious.

(Asked Bharath)

Experts in the field are requested to answer via comments

Inspirational Quotes by Great Sceintists

Science knows no country, because knowledge belongs to humanity, and is the torch which illuminates the world.

Louis Pasteur

Science is built up of facts, as a house is built of stones; but an accumulation of facts is no more a science than a heap of stones is a house.  ~Henri Poincaré,Science and Hypothesis, 1905

The whole of science is nothing more than a refinement of everyday thinking.

  ~Albert Einstein

Worthy links from Physics World

We found these links worthy to read.

The flawed multiverse

The Beginning of Infinity: Explanations that Transform the World
David Deutsch

Geek Nation: How Indian Science is Taking Over the World
Angela Saini

The Quantum Story: a History in 40 Moments 
Jim Baggott

Science model on energy transformations

I have got an assignment from school about making an energy transformation model and I have no idea what to do!
Can you help me? (Posted by Maddy on 28 Aug 2011)

(Expecting suggestions from visitors and members)

Answer:

There are many simple models for energy transformation. One of the themes for this years Science Exhibitions suggested by NCERT is “Energy Conservation”.

Any generator is a device for energy transformation.

You can think of any device which can convert energy from one form to another.

Prepare for Science Quizzes online

We are starting a series of quizzes to enable the students to practice for online quizzes.

Take the sample quiz below for getting an idea on how the quizzes will be coming. If you like it, let us know. Post your reactions as comment to this post. Based on the popularity, we will be adding more such quizzes of different duration and themes.

The Sample Quiz below is of just five questions.

You will get your score and can revise the answers at the end of the quiz.

 

Sample Science Quiz

Question 1

Who encouraged Newton to write his ideas for principia?

A
Einstein
B
Gottfried Wilhelm Leibniz
C
Galileo Galilei
D
Leonardo da Vinci
E
Edmund Halley
Question 2
What is the measure of stellar brightness?
A
Magnitude
B
Albedo
C
Luminous intensity
D
Luminosity
Question 3
What is the reciprocal of impedance?
A
Admittance
B
Conductance
C
Conductivity
D
Permittivity
Question 4
Who formulated the idea " the farther away a galaxy the faster it is moving "?
A
Edwin Hubble
B
Galileo
C
Isaac Newton
D
Kepler
Question 5
Which famous Danish physicist determined the speed of light in 1675?
A
Romer
B
Michaelson
C
Fizeau
D
Foucault
There are 5 questions to complete.
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Photos from KVS Regional Science Exhibition (Chennai) 2010

The KVS Regional Science Exhibition 2010 (Chennai Region) was conducted at KV Pattom on 1 & 2 Sep 2010

image image image image

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