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SCIENCE MODEL QUESTION PAPER – 1
I.
Four Alternatives are provided for each question. Choose the most appropriate alternative
and write it in the space provided.
10x1=10
1. When light is incident on certain materials, the materials eject electrons. The electron
movement can be regulated to construct,
A) Solar Water heater
B) Solar Cell
C) Solar Cooker
D) Solar Furnace
2. The advantage of converting unsaturated edible oils into saturated fats is that, the fats,
A) are easily digested
B) are in solid state C) last longer
D)
contain
nutrients
3. The pollutant responsible for the depletion of Ozone layer is
A) Sulphur dioxide
B) Carbon monoxide
C) Chloroflouro Carbon
D) nitrogen dioxide
4. Which of the following is a nuclear fusion reaction?
A) Hydrogen atom + Hydrogen atom ---> Hydrogen Molecule + Energy
B) Uranium + Neutron -> Barium + Krypton + Neutron + Energy
C) Hydrogen nucleus + Hydrogen nucleus --> Helium nucleus + Energy
D) Carbon + Oxygen --> Carbon dioxide + Energy
5. If a non-nucleated cells of meristematic tissue are used for tissue culture, then
A) growth rate will be high
B) growth rate will be average
C) growth rate will be very low
D)growth may not take place
6. If the number of Hydrogen atoms in an alkyne is 10, then the number of Carbon atoms in it
is,
A) 4
B) 6
C) 3
D) 5
7. The time interval between the source of the sound and echo is 4S. If the speed of sound in
air is 340ms-1 then the distance between the source of sound and the reflecting surface is,
A) 340m
B) 1360m
C) 680m
D) 135m
8. 8. A student after observing a blood slide under a compound microscope identifies RBC
and WBC based on the following observations,
A) RBC less in number, WBC non nucleated.
B) RBC nucleated, bi concaved WBC
C) RBC non nucleated, larger and nucleated WBC.
D) RBC non nucleated, non nucleated, amoeboid WBC.
9. 9. Invar steel is used to make measuring tapes, because,
A) it has higher expansion property
B) it's length does not change considerably due to variation in temperature
C) it is not affected by the chemicals
D) it has high ductility
10. A tall plant with red flowers is crossed with a dwarf plant with yellow flowers. One of these
represents dwarf plants with red flowers.
A) TtRr
B) TTRr
C) ttRR
D) TTRR
II. Match the names of plants given in column "A" with their structure in Column "B" and
characteristic features in Column 'C'
4x1=4
A
B
C
1) Spirogyra
a) Seeds do not show symmetry
i) Has parallel veins
2) Adiantum
b) Sporophyte is a prothallus
ii) Adult plant is a sporophyte
3) Cycas
c) Contains xanthophyll in excess
iii) Micro spores contain male gamets
4) Mustard
d) Seeds are not enclosed by fruits iv) Adult plant is a gametophyte
e) Thalloid structure
v) Has reticulate veins
f) Gametophyte is a prothallus
vi) Rhizoids are absent
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III. Answer the following questions :
7x1=7
11. Mention any one use of Jatropha seeds.
12. Feathers play an important role in the continuation of a bird's species. Justify.
13. Write the balanced chemical equation for the reaction when Glucose combines with
Fructose to give Sucrose.
14. What is escape velocity?
15. How is the colour of the star related to its' temperature?
16. Hormones are called chemical messengers. Why?
17. The material to be electroplated should be connected to cathode. Why?
IV. Answer the following questions:
16x2=32
18. Draw a neat diagram of a single stage rocket and label the parts.
19. Write the balanced chemical equation for the following reactions:
(i) Powdered quartz is heated with powdered magnesium.
(ii) Steam is passed over red hot silicon.
20. "Doppler effect is used to estimate the speed of galaxies". Explain.
21. List any two characteristic features of primates.
OR
List any two characteristic features of reptiles.
22. Roof top gardening may be a solution to various environmental problems. Explain.
23. A small quantity of curds is added to milk. This mixture is kept in the refrigerator for about
4
hours. When it is taken out, it is observed that it has not curdled completely. Give
scientific reason for this.
24. Environmentalists oppose setting up of nuclear power plants. List four arguments to
support this.
OR
Nuclear disarmament is a need in today's situation. Support this statement. Write scientific
reasons.
25. Aquatic plants do not decay even though they are always in water. Why?
OR
Patients with uncontrolled diabetes may lose weight. Explain.
26. How is Graham's law of diffusion useful in the enrichment of Uranium? Explain.
27. Letting sewage water into water bodies may result in the depletion of underground water.
Justify.
28. Draw a diagram of expansion stroke of an external combustion engine and label the parts.
29. Why the motion of simple pendulum is considered as simple harmonic motion?
30. The fuel is ignited in the diesel engine even though there is no spark plug. Why?
31. Draw a diagram of voltameter used in electroplating and label the parts.
32. Optic fibres are used instead of metallic cables in modern communication system. Give
two
reasons for this.
33. 2Fe2O3 + 4Al -> 2Al2O3 + 4 Fe
CuSO4 + Fe -> FeSO4 + Cu
2AgNO3 + Cu -> Cu (NO3)2 + 2Ag
Observe the above chemical equations and arrange the metals in the reactions in their
increasing
order of reactivity.
V. Answer the following questions.
5x3=15
34. Draw a neat diagram of electrolytic cell used in the extraction of Aluminium.
35. a) Write the differences between forward bias and reverse bias of a diode.
b) Why is diode called a rectifier?
36. Draw the diagram showing the structure of HIV and label the parts.
37. The atomic number of Magnesium is 12. Explain to which block and period of the periodic
table does it belong?
OR
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Lithium, Berylium, Boron, Carbon, Nirtrogen, Oxygen and. Fluorine are first seven elements
of the second period of the periodic tables.
38. i) Which element has the least ionisation energy? Which element has highest ionisation
energy?
ii) Which element has highest atomic radius? Which element has the least atomic radius?
iii) What will be the chemical nature of the 8th element of the period? 39. Explain DNA
finger print technology. Mention any one use of the same.
OR
Production of genetically modified plants is both a boon and bane, Explain.
VI. Answer the following questions.
3x4=12
39. Draw a neat diagram of vertical section of human eye and label the following parts.
(a) lens
(b) yellow spot.
40. a) Cyclohexane does not belong to aromatic class even though it has ring structure. How
do you justify this?
b) Write the structural formula of the first member of cyclo alkane and aromatic
hydrocarbon.
OR
a) Write the structural formula of the compounds having
(i) 3 - PH and one - COOH group
b) Even though NaOH contains - OH group, it is not included in the group of organic
substances. Why?
41. a) State the Faraday's laws of electromagnetic induction
b) Symbolic representation' of a transformer is given below.
Primary coil
Secondary coil
1000 turns
20 turns
If the voltage in primary coil is 250V, then find the voltage in secondary coil.
OR
a) State the principle of working of a transformer. Mention the two types of transformers.
b) If the primary of a transformer has 10 turns and the secondary of the transformer has
200 turns to what, type of transformer does it belongs. Express mathematical form
related to this.
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