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Science and Technology Paper One

Time : 3 hours    

Max Marks: 80       

SECTION 'A'

1. (A) Answer the following sub - questions. (5 Marks)

1. The device used for producing current is called a ..................... .
(a) voltmeter (b) ammeter (c) galvanometer (d) generator

2. At the time of short circuit, the current in the circuit ..................... .
(a) increases (b) decreases (c) remains (d) increases in steps

3. The direction of the magnetic field around a straight conductor carrying current is given by
.....................
(a) right hand rule (b) Fleming’s left hand rule (c) Fleming’s right hand rule (d) none of these

4. The relation between electricity and magnetism was first established by ..................... .
(a) Ohm (b) Ampere (c) Oersted (d) Moseley

5. The region around magnet is called as .............. .
(a) magnetic Area (b) magnetic field (c) magnetic loop (d) magnetism

(B) Rewrite the following statements by selecting the correct  options: (5 Marks)

1. The image formed by a concave mirror is ..................... .
(a) always virtual and erect
(b) always virtual and inverted
(c) virtual if the object is placed between pole and focus 
(d) virtual if the object is beyond  focus

2. A concave mirror forms a virtual image of an object placed ..................... .
(a) at infinity
(b) at the centre of curvature of the mirror
(c) at the focus of the mirror
(d) between the focus and the mirror

3. A convex mirror always forms an image which is ..................... than the object size.
 (a) larger
(b) smaller
(c) double
(d) three times

4. No matter how far you stand from a spherical mirror, your image appears erect. The mirror may be ...........
 (a) Plane
(b) concave
(c) convex
(d) either plane or convex

 5. In case of a concave mirror, an erect image is ..................... .
 (a) real and enlarged
(b) real and diminished
(c) virtual and diminished
(d) virtual and enlarged



2. Attempt the following. (10 Marks)




4. Explain why a conductor is heated when current flows through it.



3. Attempt the following. (15 Marks)


3. Write Short notes on :Earthing.



5. Define the following: 

Bases.



Q4. Attempt the following (any 1) ( 5 marks)



2. Explain the zig-zag line in the periodic table.





Section B

5. (A) Fill in the blanks (5 Marks)

*1. In ..................... mode of reproduction, the offsprings are with minor differences. (Asexual)

*2. Both the parents contribute equal amount of ..................... material to the offspring. (Genetic)

*3. Dominant character masks the ..................... character. (Recessive)

*4. Selection by nature is not ..................... but ..................... . (Deliberate, natural)

5. Mendel’s experiments were based on a number of visible contrasting characters of garden peas _________ (Pisum sativum)

(B) Fill in the blanks (5 Marks)

1. A fragment of DNA that provides complete information about one protein is known as the ..................... for that protein. (Gene)

2. All children inherit ..................... chromosome from their mother. (X)

3. 3. Sex determination in human beings is ..................... . (Genetical)

4. ..................... are collected from different levels of depths. (Fossils)

5. Minor differences occur in asexual reproduction due to inaccuracies occuring in ..................... . (DNA copying)


6. Attempt the following. (10 Marks)



2. WRITE SHORT NOTES ON : Catenation


 3. Draw neat and labelled diagram: Human excretory sytem [Diagram]


4. Explain the following Term: Hydrotropic movement




7. Attempt the following. (15 Marks)




2. Give Scientific Reason: Electrolysis of active metals like Na, K, Al is not carried out by using aqueous solution of their chloride.



3. Mention one provision on environment given in our constitution.



4 . How do plants get rid of their excretory products?



5. Write Short notes on: Reflex action



8. Attempt the following (5 marks.)

1. Explain the structure and function of a nephron.





State work of WBCSD

State two functions of MPCB for prevention of water pollution.

Write three measures to conserve water.

What are the objectives of sustainable development? Define sustainable development.

What are the objectives of sustainable development? Define sustainable development.

What is sustainable use? How is it possible at individual level and community level?

How will you obtain alternative fuel?

Do you think that use of 'Kullad' (clay cup) in railways for providing tea and coffee is a way of sustainable use of resources? How?

What are the powers of MPCB to control water and air pollution?

What is the three 'R' mantra' ? Write its significance.

What is meant by consumerism? How does it affect sustainable development?

Write the salient features of the Biomedical Waste Rules.

Write the objectives of the Water Act.

Give the need to use eco - friendly technology.

Define eco - efficiency. What are the ways to achieve eco - efficiency?

Beej Bachao Andolan

Narmada Bachao Andolan

Chipko Movement

What is recycling? Give one example.

What does this log indicate? Write some names of products on which you find this logo.

What is eco - mark?

What are the reasons for depletion of biological resources?

How can we save energy in day to day life?

What is the fundamental duty of each citizen regarding environment?

Mention one provision on environment given in our constitution.

To minimize electricity consumption at home.

To avoid noise pollution in silent zones.

The level of air pollution is very high in your locality.

To avoid pollution of land when you go on a picnic.

The use of fossil fuels in villages.

Bursting fire crackers in festivals and processions.

To avoid noise pollution in classroom.

Give the impacts of Noise pollution on the human body.

What major harm is done to the human being by air pollution?

How do you protect soil from being polluted?

How do biodegradable and non biodegradable waste cause land pollution?

Describe the main sources of water pollution.



What are the different laws to prevent pollution?

What adverse effect does ozone depletion have?

Oil Spills

Eutrophication

Acid rain



Primary Pollutant V/s Secondary Pollutant

Primary pollutant
Secondary Pollutant
1.    Primary pollutants are the pollutants that are emitted directly from the sources and are found in the atmosphere in the form in which they were emitted.
2.    Examples: Ash, smoke, radioactive compounds, oxides of sulphur etc.
1.    Secondary pollutants are the pollutants that are formed in the atmosphere by chemical reactions between primary pollutants and atmospheric constituents.
2.    Examples: SO3 m O3 , Ketones, Peroxyacetyl nitrate.

Degradable Pollutants V/s Non Degradable Pollutants.

Degradable pollutants
Non degradable pollutants
1.    Degradable pollutants can be decomposed or degraded easily.
2.    Decomposition takes place by microorganisms and it requires less time.
3.    These pollutants again enter the biogeochemical cycles and become part of the natural nutrient cycle.
1.    Non – degradable pollutants cannot be easily decomposed.
2.    It requires more time and different techniques for decomposition.
3.    These pollutants will remain on the earth for years and create environmental pollution.

Answer the following in one sentence:

Write whether the following statements are true or false. If false write the correct statement.

Darwin's theory of evolution.

With the help of a diagram(Punnett square) show a Mendelian experiment where tall tea plant bearing red flower is crossed with a short pea plant bearing white flowers. Write both the phenotypic and genotypic ratio for F2 generation.






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