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Posted By: Fortune Member Level: Diamond Posted Date: 04 Apr 2008
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2007 Himachal Pradesh State Science I (Physics and Chemistry) - Class X Question paper
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Science I (Physics and Chemistry) - Class X
Time Allowed : 2 ½ Hours
Maximum Marks : 100
General Instructions:
Use of logarithmic table is permitted.
Answer all the questions in Section A.
Answer any five questions in Section B.
Answer any five questions in Section C choosing at least one from each Part.
Use diagrams, expressions and equations, wherever necessary.
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Physics
Section - A (50 marks)
I. Choose the correct answer :(10 × 1 = 10 marks)
1.
1000 watt is equal to
74600 HP
0.746 HP
1.34 HP
3.6× 106 HP
2.
A floating ship has stability when the
metacentre is below the centre of gravity of the ship
metacentre is above the centre of gravity of the ship
metacentre is below the centre of buoyancy
centre of gravity of the ship coincides with the metacentre
3.
A polished calorimeter should be placed in an insulated wooden box to reduce heat loss due to
conduction
convection
radiation and conduction
reflection
4.
The change from solid state to gaseous state is known as
melting
condensation
evaporation
sublimation
5.
For the study of ultraviolet radiation ................ discharge tube is made use of
glass
rock salt
quartz
flint
6.
The fundamental frequency of a closed organ pipe is 256 Hz. The first overtone is
512 Hz
768 Hz
128 Hz
256 Hz
7.
The angle between the axis of freely suspended magnet and the horizontal line is
inclination
declination
dip
magnetic meridian
8.
Radiations which are not deflected by electric and magnetic field are
alpha rays
beta rays
X-rays
cathode rays
9.
The production of X-rays requires
high voltage and high pressure
high voltage and low pressure
low voltage and low pressure
low voltage and high pressure
10.
Fleming's left-hand rule is used in
A. C. Generator
Galvanometer
Microphone
Ammeter
II. Complete the following using appropriate word / words / expressions: (5 × 1 = 5 marks)
11.
Melting point of ice decreases with..................... In pressure
12.
The device which converts chemical energy into electrical energy is..........
13.
The loudness of musical note depends on......................
14.
The swinging of a pendulum bob is an example of the conversion of .....................and vice versa
15.
Split ring is used in......................
Section - B
Answer any five of the following in one or two sentences each: (5 × 2 = 10 marks)
16.
Define metacentre.
17.
A car of mass 200 kg moves with a kinetic energy of 1000 joules. What la the velocity of the car?
18.
What is magnetic equator?
19.
What are the conditions for total internal reflection to take place?
Give reasons for the following :
20.
The filament in an electric iron is enclosed in mica.
21.
Moderators are used in nuclear reactors
Give two uses or practical applications of the following:
22.
Specific heat.
23.
UV rays.
Section - C
Answer any jive of the following, choosing at least one question from each Part: (5 × 5 = 25 marks)
Part - I
24.
Study the diagram and answer the following questions:
Consider a freely falling body of mass 5 kg at a height of 10 metre from the ground.
What is the energy of the body at A? (1 mark)
What is the energy of the body at C? (1 mark)
What is the total energy of the body at B? (1 mark)
What is the value of kinetic energy at C, If C is 8 metres from the ground? (2 marks)
25.
Study the diagram and answer the following questions
name the optical instrument
Complete the diagram
What is the nature and position of the image?
What is the magnifying power?
26.
Study the diagram and answer the following questions
Name the above instrument. (1 mark)
What is the principle of this device? (1 mark)
Can this device work when DC is used? Why? (2 marks)
Give two uses (1 mark)
Part - II
27.
Describe a method to determine the relative density of a liquid using Hare's Apparatus.
28.
State and explain the laws of vibration of a stretched string.
29.
Describe a method to determine the decimation of a place.
30.
Describe an experiment to find the melting point of naphthalene,
31.
Describe the Coolidge: tube and explain the production of X-rays.
Chemistry
Section - A (50 marks)
I. Choose the correct answers. Answer all questions : (10 × 1 = 10 marks)
1.
If 4 gms of A combines separately with 8 gms of B and 12 gms of C, the ratio in which B and C combine will be
2 : 3
l : 4
3 : 2
2 : 1
2.
An example of covalent compound is
CaF2
MgO
CO2
NaCl
3.
Which of the following is the lightest?
Alpha particle
Beta particle
Neutron
Proton
4.
The oxidation number of Mn in KMnO4 is
6
9
7
5
5.
The electrolytic dissociation of an electrolyte was propounded by
Ohm
Faraday
Dalton
Arrhenius
6.
The mass of 6-023 × 10 23 molecules of nitrogen at S.T.P. is
7
14
28
42
7.
Spiegeleisen is an alloy of
iron and carbon
iron, carbon and manganese
iron and chromium
iron, chromium and manganese
8.
................... is found in Chlorophyll.
Mg
Fe
Sn
P4
9.
The general formula for alkane is
CnH2n
CnH2n+1
CnH2n+2
CnHn+1
10.
Hydrogen replaced from acetylene shows its
basic nature
addle nature
neutral nature
none of these
II.Complete the following, using appropriate words or expressions : (5×1 = 5)
11.
Gain of electrons is ..................... .
12.
.....................is used on the tip of the match stick to combust readily.
13.
..............is a natural polymer.
14.
Anhydrous sodium carbonate is known as......................
15.
With barium chloride solution. sulphuric acid gives..................precipitate
Section - B
III. Answer any questions in one or two sentences each : (5 × 2 = 10 marks)
16.
Define Avogadro's law.
17.
State the law of reciprocal proportions. Give reasons:
18.
Electrovalent compounds have high boiling point.
19.
Alternating current cannot be used in electroplating. Complete and balance the following equations :
20.
NaOH + Al + H2O --> ...............
21.
P4 + HNO3 -->.................
Give two uses or practical applications of the following:
22.
Ethylene.
23.
Sulphuric acid.
Section - C
Answer any five of the following, choosing at least one question from each Part: (5 × 5 = 25 marks)
Part - I
24.
Identify the above element. (1 mark)
What is the mass number? (1 mark)
Find the number of valence electrons. (1 mark)
Complete the atomic structure. (2 marks)
25.
Name the labelled parts. (1 mark)
Why is a layer of charcoal kept on the surface of the electrolyte? (2 marks)
What is the reaction taking place at the cathode? (1 mark)
Name two chief ores of Aluminium. (1 mark)
26.
You are provided with the following apparatus in the lab:
Round bottomed flask, burner, delivery tube, bee-hive shelf, gas jar, trough and stand.
How will you set up the apparatus for the preparation of Methane? (3 marks)
Name the chemicals taken in the flask. (1 mark)
The delivery tube should be removed as soon as the healing is stopped. Why? (1 mark)
Part - II
27.
State the laws of radioactive decay.
28.
How is Phosphorous extracted by electrothermal process?
29.
How is sodium carbonate manufactured using Solvay process?
30.
What are saturated and unsaturated hydrocarbons? Give one example for each.
Give one test to identify them.
31.
Explain the manufacture of soap by alkaline hydrolysis method.
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