16302 science

8/3/2019 16302 Science

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Class – X

Time: 180min

Su

(Que(Que(Que(Que

1. In the reefing of silver, the recover

Write the reaction involved.

2. The electrolysis of an aqueous solu

3. What name given to the heat ener

4. What happens to the resistance as

(Ques(Ques(Ques(Ques

5. How is the sodium metal extracted

6. How does baking powder differ fro

7. A colorless lead salt, when heated

brown fumes.

8. Why does color of copper sulphate9. “Structure of small intestine is suit

10. What is the difference between a t

11. An electric heater draws a current

everyday for 30 days if the cost of

12. Explain why, a copper wire cannot

13. (a)State and explain Joule’s law of

(b)Explain why argon and nitrogen

(Questi(Questi(Questi(Questi

14. When a green salt is heated strongl

(a) Name the iron salt.(b) Name the type of reaction that

(c) Write a chemical reaction for th

15. Explain the pH change as the tooth

16. (a) Why does an aqueous solution

(b) What happens during nettle lea

17. (a) What is the role of the brain in r

(b)What is Nastic movement?

(c) What is synapse?

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Science Sample Pa

mmative Assessment -I

SectionSectionSectionSection –––– A AA A

stions number 1 to 4 carry one mark each)stions number 1 to 4 carry one mark each)stions number 1 to 4 carry one mark each)stions number 1 to 4 carry one mark each)

of silver from silver nitrate solution involved displ

tion of sodium chloride gives us three products. Na

y obtained from hot rocks inside the earth?

the conductor is made thinner?

ions number 5 to 13 carry ions number 5 to 13 carry ions number 5 to 13 carry ions number 5 to 13 carry twotwotwotwo markmarkmarkmarkssss each)each)each)each)

? Explain with the help of equation of the reaction i

baking soda?

roduce a yellow residue and brown fumes. Identif

solution change when iron nails kept immersed in id to its function”. Justify.

ermal power plant and a hydropower plant?

f 10A from a 220V supply. What is cost of using th

ne unit is Rs. 5.20?

e used as a fuse wire?

eating.

is filled in an electric bulb?

ons number 14 to 22 carry three marks each)ons number 14 to 22 carry three marks each)ons number 14 to 22 carry three marks each)ons number 14 to 22 carry three marks each)

y, it color finally change to black and odour of burn

takes place during the heating of iron salt.

e reaction involved.

decay. How can tooth decay caused by pH change

f acid conduct electricity?

es sting? What is its remedy?

eflex action?

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er – 2011-2012

M.M: 80marks

cement by copper metal.

e them.

nvolved.

the yellow residue and

t?

heater for 5hours

ing sulphur is given out,

e prevented?

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18. (a) How do auxins promote the gro

(b)Name the plant hormone that in

19. (a) What is meant by ocean therma

(b) Why is bio- gas considered an id

20. How you can three resisters of 2 oh

2.5 ohm? Draw the diagram to sho

(b) Define potential difference.

21. A copper wire has a diameter of 0.

(a) What will be the length of this

(b)How much does the resistance c

22. (a)Why are copper and aluminium

(b)Define resistivity. Write its S.I. u

(Quest(Quest(Quest(Quest

23. (a) Give reason; platinum, gold and

(b) What are the amphoteric oxide

(c) In the electrolytic refining of a

electrolyte?

Explain how the following metals a

(a) Metal “M” which is high up in

(b) Metal “X” which is in the middl

24. (a) How are the alveoli designed to

(b) Why do herbivores have longer

(c) What are the end products of di

(d) What is the main function of bil

(e) On which molecule does life on

(a) Give a schematic representation(b)How is it beneficial to have large

25. (a) What is the electromagnet? Dra

electromagnet?

(b) What is the purpose of soft iron

(a) Describe the pattern of magne

(b) How will you determine the dir

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th of tendrils around a support?

habits the growth of plants.

l energy?

eal fuel for domestic use?

m, 3 ohm, and 5 ohm respectively so as to obtain a

the arrangement.

5mm and resistivity of 1.6 x 10-8

ohm meter.

ire to make its resistance 10 ohm?

hange if the diameter is doubled?

ires usually used for electricity transmission?

it.

ions number 23 to 25 carry five marks each)ions number 23 to 25 carry five marks each)ions number 23 to 25 carry five marks each)ions number 23 to 25 carry five marks each)

silver are used to make jewelry.

? Give its two examples.

etal “M”, what would you take as the anode, the c

ORe obtained from their compounds by the reduction

the reactivity series.

of the reactivity series. Give one example of each.

maximize the exchange of gases?

intestine?

gestion?

?

earth depend?

OR

of transport and exchange of oxygen and carbon-number of highly coiled nephrons in our kidneys?

w a circuit diagram to show a soft iron piece can be

core is used in making an electromagnet?

OR

ic field of a straight current carrying conductor.

ection of a magnetic filed around a straight current

SectionSectionSectionSection –––– BBBB

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resultant resistance of

thode and the

process :

ioxide in human beings.

transformed into an

carrying conductor?

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(Question(Question(Question(Question

26. An element common to all acids is

A. Chlorine

C. Oxygen

27. When aqueous solutions of an acid

A. no reaction occurs

C. a salt and water is formed

28. Identify the chemical equation whi

chloride with sodium sulphate to p

A. BaCl2(aq) + Na2SO4 (aq) Ba

C. 2BaCl2(aq) + Na2SO4 (aq) 2B

29. A solution turns red litmus to blue.

A. 2

C. 7

30. The reaction:

Fe2O3(s) + 2Al(s)

Ferric oxide Aluminium Al

is an example of a–A. combination reaction

C. decomposition reaction

31. In the circuit shown here, the amm

The correct value of resistance:

A. Exactly 4Ω

C. Slightly less than 4Ω

32. Fuse blows because:

A. There is a high voltage connect

B. There is a high current flowing

C. There is a high charge that has

D. The effective resistance of the

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s number 26 to 41 carry one mark each)number 26 to 41 carry one mark each)s number 26 to 41 carry one mark each)number 26 to 41 carry one mark each)

B. Nitrogen

D. Hydrogen

and base are mixed

B. a new acid and a new base

D. an acid and a salt is formed

ch represents a complete balanced equation for th

oduce barium sulphate and sodium chloride.

O4(s) + 2NaCl(aq) B. BaCl2(aq) + Na2SO4 (aq)

SO4(s) + NaCl(aq) D. BaCl2(aq) + Na2SO4 (aq)

It’s pH is likely to be:

B. 5

D. 10

Al2O3(s) + 2Fe(s)

uminium oxide Iron

B. double displacement reacti

D. displacement reaction

eter A reads 5A and the voltmeter V reads 20V.

B. slightly greater then 4Ω

D. zero

ed across the circuit.

through the circuit.

passed through the circuit.ircuit is too high.

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9810817270

9540258238

are formed

reaction of barium

2BaSO4(s) + 2NaCl(aq)

BaSO4(s) + NaCl(aq)

on

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33. While doing experiment, for findin

students X, Y and Z set up their circ

The correct setup is that of:

A. Student X and Y

C. Student Z and X

34. Two resistances are connected in p

itself:

A. In the inverse ratio of resistanc

C.

Equally in both the resistance

35. Two electric bulbs, one of 200volt

A. They have equal current flowin

B. The resistance of the filaments

C. The resistance of the filament i

D. The resistance of the filament i

36. This is the hormone which is produ

in proper amounts, the sugar level

A. Testosterone

C. Estrogens

37. The given figures show holozoic nucomplete steps of nutrition:

A. b, c, a & d

B. a, b, d & c

C. d, c, a & b

D. a, a, c & b

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the equivalent resistance of two resistors connect

uits as shown below:

B. Student Y and Z

D. All the three students

arallel and a current is sent through the combinatio

e B. In the direct ratio of resista

D. None of these

0watt and the other 200volt 100watt are connecte

g through them.

in both the bulbs is same.

n 40watt bulb is more than the resistance in 100wa

n 100watt bulb is more than the resistance in 40wa

ced by pancreas and helps in regulating blood suga

in the blood rises. This is:

B. Corticosteroids

D. Prostaglandins

trition in Amoeba. Arrange the figures in correct se

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9540258238

d in series, three

n. The current divides

nce

d in a house wiring circuit

tt bulb.

tt bulb.

levels. If it is not secreted

uence so as to give

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38. The sensitive plant Mimosa pudica

leaf droops down. The drooping is

A. Loss of turgidity of the basal pa

B. Swelling of the basal part of th

C. Change in direction of leaf gro

D. None of the above.

39. Which of the following region of brand auditory stimuli?

A. Fore-brain

C. Hind-brain

40. The given figure is a demonstration

photosynthesis. What is the substa

A. Potassium hydroxide

B. Sodium bicarbonate

C. Sodium carbonate

D. Potassium sulphate

41. Which of the following statement i

respiration:

A. It takes place in the micro-orga

B. It produces a considerable larg

C. It favors partial breakdown of f

D. In animal muscles, lactic acid is

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(as in figure) shows siesmonastic movement as a re

ue to:

rt of the leaf.

leaf.

th.

ain controls reflex moments of the head, neck and

B.Mid-brain

D. None of these

of an experiment to show that carbon dioxide is es

nce ‘X’, kept in watch glass,

false about anaerobic

nisms like yeast.

amount of energy.

ood.

the end product.

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9810817270

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sult of which the whole

runk in response to visual

sential for

16302 science

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