Chemical Effects of Electric Current

  1. Which of the following will conduct electricity?
  1. pure water
  1. impure water
  1. distilled water
  1. all the above
  1. LED is :-
  1. light emitting diode
  1. light evolving diode
  1. light eliminating diode
  1. light entering diode
  1. An electrolytic cell converts :-
  1. electrical energy to light energy
  1. chemical energy to electrical energy
  1. chemical energy to light energy
  1. electrical energy to chemical energy
  1. An electric current is generated due to :-
  1. flowing protons
  1. flowing neutrons
  1. flowing electrons
  1. all the above
  1. Match the column :-

a. Cathodei) positively charged ions

b. cationsii) negative electrode

c. Anodeiii) resist corrosion

d. anionsiv) positive electrode

e. Electroplatingv) negatively charged ions

  1. Fill in the blanks :-
  1. An electric current can bring about a ______change.
  1. An ______when dissolved in water, breaks up into ions.
  1. ______are materials that allow electricity to flow through them.
  1. ______are also called as insulators.
  1. A source of electricity is called a ______.
  1. Define electrolysis. Through diagram represent movement of ions during electrolysis.
  1. Write one important application of electrolysis in our daily life.
  1. What is the actual direction of electric current?
  1. Why is it dangerous to handle electrical appliances with wet hands or while standing on a wet floor?

Conservation of plants andanimals

1.Large scale cutting of trees and clearing of forests is called:-

a.reforestation

b.globalwarming

c.deforestation

d.afforestation

2.Wise and judicious use of plants and animals is called their:-

a.recycling

b.conservation

c.reforestation

d.reconstruction

3.The largest among various protected areas is a:-

a.nationalpark

b.wildlifesanctuary

c.biospherereserve

d.botanicalgarden

4.The biosphere consists of a extensive network of inter-connected:-

a.forests

b.countries

c.foodchains

d.ecosystems

5.Match the column:-

ProtectedareaAnimalsmaintained

a.Kanha nationalparki) Siberiancrane

b.Girsanctuaryii) Indianelephant

c.Bandipursanctuaryiii) one hornedrhinoceros

d.Kazirangasanctuaryiv)Lion

e.Bharatpursanctuaryv)Tiger

6.Fill in the blanks:-

a.Plants found in a particular area arecalledof that area.

b.All non living things constitutethecomponent of anecosystem.

c.Red Data Book provides information onthespecies.

d.Birds which fly from one habitat to another arecalledbirds.

e.Species that at present exist in small numbers arecalledspecies.

7.Define threatenedspecies?

8.What are endemic species? Giveexamples.

9.Write full forms of the following:

i)IUCN

ii)WCU

10.Differentiate between the terms extinct and extinct in the wild with suitable examples?

Pollution of Air and Water

  1. Water is a :-
  2. renewable
  1. non renewable
  1. recyclable
  1. both a & c
  1. Extracts from neem tree are example of :-
  1. non biodegradable pesticide
  1. biodegradable pesticide
  1. pollutants
  1. fertilizers
  1. Water that is fit for drinking is called :-
  1. portable water
  1. pourable water
  1. potable water
  1. ground water
  1. A poisonous gas that has a strong smell of rotten eggs is :-
  1. hydrogen sulphide
  1. hydrogen chloride
  1. carbon monoxide
  1. sulphur dioxide
  1. Match the column :-

Air pollutantSource

a. COi) drycleaning

b. Acid fumesii) stone crushers

c. Smokeiii) automobile exhausts

d. Dustiv) fungicides

e. Mercuryv) combustion of fossil fuels

  1. Describe greenhouse effect? Name any four greenhouse gases and measures to reduce them.
  1. List some of the most hazardous effect of air pollution on human society?
  1. Acid rain pollutes :-

a.air

b.water

c.soil

d.both b & c

  1. Water pollution can be classified as :-
  1. chemical
  1. biological
  1. both a & b
  1. economical
  1. An air pollutant that combines with hemoglobin present in the blood is :-
  1. CO
  1. CO2
  1. HCl
  1. H2S
  1. Which of the following will cause the minamata disease :-
  1. lead poisoning
  1. mercury poisoning
  1. Arsenic poisoning
  1. all the above
  1. Match the column :-

a. Bhopal gas tragedyi) asbestos fibre

b. Lung cancerii) SPM

c. Asthmaiii) carbon dioxide

d. Greenhouse gasiv) sewage

e. Contaminated waterv) methyl isocyanate

  1. Differentiate between effect of ozone in different layers of atmosphere?
  1. What are the methods of reducing air pollution?

REPRODUCTION IN ANIMALS

Q1. Answer the following :

i. Female Gamete in humans.

ii.Organism with largest egg.

iii.Part where development of the baby takes place.

iv.Name the first successfully cloned sheep.

v.Type of fertilisation in hens.

vi.Example of viviparous organism.

vii.Example of an organism with internal fertilisation and external growth of baby.

viii.Example of an organism with external fertilisation –

Q2. What are the types (modes) of reproduction?

Q3. Why reproduction is an essential process?

Q4. What are male reproductive parts?

Q5.Name the reproductive parts of females.

Q6.What are the different parts of a sperm?

Q7. Name the organism which produces the largest eggs.

Q8. Define foetus.

Q9. What is metamorphosis?

Q10. Define sexual reproduction.

Q11. What is reproduction?

Q12. Why fission in amoeba called binary fission?

Q13. Name the organs that produce sperms and ova in males and females, respectively.

COMBUSTION AND FLAME

Q1. Name the following

1. The materials which produce heat energy on burning in air.

2. Ignition temperature of Phosphorous.

3. Mixture on which side of match box is coated.

4. Materials which exhibit slow combustion.

5. Any two substances which burst into flames when kept in air for some time.

6. A region of burning gases.

7. The coldest part of candle flame.

8. A fuel with least calorific value.

9. A gas produced during combustion which causes acid rain.

10. Any three examples of inflammable substances.

11. Any three examples of gaseous fuels.

12. Any three examples of solid fuels.

13. Different zones of candle flame.

14. Process of production of energy in sun.

Q2. Name a few fuels used in our homes.

Q3. Name a few fuels used in trade and industry.

Q4. What fuels are used for running automobiles?

Q5. What is the difference between the burning of a candle and burning of a fuel like coal?

Q6. What is combustion?

Q7. Define a fuel?

Q8. (i) What are the essential condition required for combustion?

(ii) What is the essential condition required for extinguishing fire?

Q9. What are inflammable substance?

Q10. In what form is LPG stored in cylinders?

Q11. Name the most common fire extinguisher?

Q12. Water is not suitable for fires involving electrical equipment oil and petrol. Why?

Q13. Explain how CO2is able to control fires?

Q14. What are the requisites (qualities) of a good (ideal) fuel?

Q15. Explain the following terms:- (i) Global warming (ii) Acid rain

Q16. Suppose you are asked to boil a given quantity of water using cow dung cake, coal and

LPG as fuels. Which fuel would you prefer? Give your reason.

Science (Light)

1. The amount of light that is reflected depends on :-

a. the material of the surface

b. the length of the surface

c. the nature of the surface

d. only a & c

2. Form of energy that gives us sensation of sight is :-

a. reflection

b. light

c. refraction

d. dispersion

3. Moon is a :-

a. non-luminous body

b. luminous body

c. semi-luminous body

d. black body

4. Which of the following is possible?

a. sunlight

b. moonlight

c. earthlight

d. all the above

5. What are the laws of reflection?

6. Through a well labeled figure show various terms related to reflection?

7. State difference between following two images:

8. The most comfortable distance at which one can read with a normal eye is about :-

a. 20 cm

b. 22 cm

c. 25 cm

d. 30 cm

9. Impression of an image persists on retina for about:-

a. 1/12th of a second

b. 1/16th of a second

c. 1/10th of a second

d. 1/15th of a second

10. The visually impaired can also read with fingers using a special alphabet called :-

a. Bralle

b. Brialle

c. Brallie

d. Braille

11. Image formed on retina is/are :-

a. upside down

b. flat

c. reversed left to right

d. all the above

12. Match the column :-

a. nearsightedness i) old age eye defect

b. farsightedness ii) area of no vision

c. cataract iii) plenty of cones

d. blind spot iv) hypermetropia

e. yellow spot v) myopia

13. Differentiate between image formed by regular and diffused reflection?

14. Describe lateral inversion. Do you find any application of it in daily life?

Coal and Petroleum

1. A solid fuel formed by heating coal in the absence of air :-

a. hydrogen

b. coke

c. methane

d. coal tar

2. Fossil fuels does not include:-

a. coal

b. petroleum

c. biogas

d. natural gas

3. For generation of electricity in thermal power plants we need:-

a. coal

b. petroleum

c. natural gas

d. biogas

4. Coal is a mixture of substances containing:-

a. carbon

b. hydrogen

c. oxygen

d. all the above

5. Define carbonization?

6. How burning of coal can create serious global problems?

7. Classify the following resources as natural or man- made :

petroleum, bleach, coal, steel, wind, alloys, water.

8. What can be potential effect of petroleum products on environment?

9. Where and how is petroleum separated into usable products?

10. Classify the following resources as living and non living natural resources:

plants, water, animals, microbes, soil, minerals.

Reaching the Age of Adolescence

1. Which of the following is a ductless gland :-

a. sweat gland

b. salivary gland

c. sebaceous gland

d. pituitary gland

2. Adolescence brings in the individual :-

a. mental maturity

b. reproductive maturity

c. emotional maturity

d. all the above

3. In boys, voice box protrudes out in throat region and is called :-

a. custard’s apple

b. adam’s apple

c. eve’s apple

d. both b & c

4. A female secondary sexual characteristic is :-

a. voice becoming shrill

b. voice becoming hoarse

c. growth of adam’s apple

d. growth of hair on the chest

5. What are ductless glands?

6. Define hormones and their special features?

7. Pick the odd word out of the following:

adrenalin/amylase/thyroxine/testosterone/oestrogen

8. Write the correct words by putting letters in correct sequence

i) trepbuy

ii) carhenem

9. Name the specific term used for characteristics that help to distinguish males from

females and give examples of those as well.

10. Name the gland which regulates secretion of hormones from male and female gonads

also mention functions of male and female sex hormones.

11. Write the following sentences related to menstrual cycle in their correct sequence:

a) release of egg from ovary

b) breakdown of thickened inner wall of uterus

c) thickening of wall of uterus

d) maturation of ovum

Stars and solar system

1. The clusters of stars forming recognizable patterns on a clear night :-

a. phases

b. eclipses

c. milky way

d. constellations

2. If the distance of Saturn from the sun is 1427 million km then the distance of Neptune

should be :-

a. 780 million km

b. 1420 million km

c. 4498 million km

d. 58 million km

3. The planet also known as evening star is :-

a. Mercury

b. Venus

c. Mars

d. Jupiter

4. A planet with well developed set of rings is :-

a. Neptune

b. Jupiter

c. Uranus

d. Saturn

5. Differentiate between a new moon and full moon ?

6. Next nearest star for Earth after Sun is:-

a. Ursa major

b. Ursa minor

c. Orion

d. Alpha Centauri

7. Science that deals with the study of universe is:-

a. Astronomy

b. Astrology

c. Agronomy

d. Spacionomy

8. Pole star is a part of which of the following constellations?

a. ursa major

b. ursa minor

c. orion

d. Cassiopeia

9. ______is the dwarf planet:-

a. neptune

b. uranus

c. pluto

d. mercury

10. Compare stars and planets?

11. Differentiate between meteors and comets?