EM AMPLE UESTIONS - WordPress.com · S AMPLE Q UESTIONS. PHYSICS & CHEMISTRY EM Prepared by: Noushad Parappanangadi, Mob: 9447107327, 8301077327

SAMPLE QUESTIONS

PHYSICS & CHEMISTRY

EM

Prepared by: Noushad Parappanangadi, Mob: 9447107327, 8301077327


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WAVE MOTION 1. Select the odd one.

a) Compressed area, rarefaction area,

trough, longitudinal wave

b) Light, radio wave, sound wave,

infrared wave

2. The natural frequency of a table is 500Hz.

A tuning fork with natural frequency

256Hz is excited and fixed on the table.

a) At this time what is the number of

vibrations per second produced on

table.

b) What is this phenomenon?

c) Explain that phenomenon?

3. A sound is kept for 1/10 second.

a) What is this phenomenon?

b) What is the minimum distance

between sound source and obstacle

to produce echo?

4. Write two methods to reduce

reverberation in an auditorium?

5. “Sound is transmitted in different speed

on different medium.” Comment on this

statement?

6. What are the factors that affect the

velocity of sound through air?

7. Write a short note about seismic waves.

How can be detect the intensity of earth

quake?

8. Match suitably

A B C

Echo Identical natural frequency

Boom sound

Resonance 15Hz Ultrasonic

Continuous reflection

17m Highest amplitude

Reverberation Sound reflection

9. What is meant by natural frequency?

What are the factors that affect the

natural frequency of an iron rod?

10. A sound is heard by a man after 5sec

from its generation by another man.

Calculate the distance between both of

them?

12. Answer the following.

a) An instrument on the basis of

continuous reflection.

b) The boom sound in an auditorium.

EFFECTS OF ELECTRIC CURRENT 1. Complete the following suitably

a) Motor: Electric energy Mechanical

energy::Heater: …………..

b) I2Rt: H:: I2R : …………….

c) Filament lamp: Tungsten:: Heating

coil: …………………..

d) Power: watt:: energy: ………………..

e) Hydrogen: Blue:: Nitrogen: ……………

2. Write the electric effect in the following.

a) Lighting the bulb.

b) Electric heater is working

3. a) Write the situations to produce excess

current in a circuit.

b) What are the problems related to

this?

c) How can we rectify this?

4. Write the instructions to improve the

efficiency of a filament lamp?

5. Explain the working of discharge lamp?

6. Find the resistance and intensity of

current of 100W, 250V electric bulb?

7. Two electric cable in a power supply

without any insulation is contacted each

other.

a) What happened to the flow of

current through this supply?

b) What is this phenomenon?

c) Write a method to rectify this?

8. 1000W, 250V is marked in an iron box.

a) Which material is used as heating coil

in iron box?

b) Calculate the heat produced by iron

box for 10 minutes?

9. Calculate the heat generated by a kettle

of resistance 200Ω and 200V is passed for

12minutes? Also find the intensity of

current?

10. Write the structure and function of arc

lamp?

11. Natural frequency of the vibrating object

= Natural frequency of the vibrated

object. What is the phenomenon?

11. Calculate the amperage of fuse used in a

heater of 3kW power and 240V potential

difference?

1

PHYSICS


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12. CL lamp is energy efficient but harmful to

surroundings.

a) How it is harmful?

b) Write any suggestion to overcome

this?

ELECTROMAGNETIC INDUCTION 1. What are the parts of an AC generator?

2. Differentiate between step up and step

down transformer?

3. 6600 winding are used in primary of a

transformer to convert 110V to 60V.

a) Which type of transformer is this?

b) Calculate the number of windings in

secondary?

4. Complete suitably

a) Self-induction: AC:: Mutual

induction:…………..

b) Transformer: Mutual induction:: AC

generator: ……………………

c) AC generator:

Armature::Microphone: …………………..

5. 24V/0.4A is produced in the secondary of

a transformer while giving 2A current in

the primary.

a) Find the voltage in primary?

b) Find power in the secondary?

6. Np:Ns = 8:10. Calculate the secondary

voltage when 630V is applied in the

primary?

7. Complete the table.

Instrument Working principle

Energy change

Generator

Microphone

Transformer

8. A bulb of 6V is given with 12V AC source.

a) What happened when this source is

directly given to the bulb?

b) Write the method to work this bulb

safely?

9. Suku winded a transformer to convert

250V to 15V.

10. Suggest three methods to increase the

emf at the time electromagnetic

induction?

POWER GENERATION AND DISTRIBUTION 1. Write the energy changes in each power

station you have studied?

2. Write any methods adopted by you to

decrease energy utilization?

3. Sasi rearranged electric fuse with thick

copper wire. What will happen to the

circuit?

4. Write the methods to produce

mechanical energy for the working of

power generator?

5. Find the heat energy produced by a

heater of 1kW for 1 hour?

6. AC is used for distribution. Why?

7. We studied about the single phase and

three phase generator. Why there is no

two phase generator?

8. Complete suitably

a) Armature: Stator::Field magnet:

………..

b) Switch: Phase: Fuse: …………….

9. Match the following

A B C

Thermal power station

Earthing Exciter

Huge generator

High voltage Thick and length pin

Star connection

Nuclear energy

50Hz

Three pin Heat energy 230Hz

Power distribution

11kV 0V

Power house

Electro magnet

Low energy lost

Moolamattom 400V

Neutral Electric energy

a) Which of the coil

(primary/secondary) needs more

windings?

b) Find the number of windings in

primary when secondary have 200

windings?

10. Write the advantages of three phase AC

over single phase AC generator?

11. Raju connected fuses on phase and

neutral lines for security.

a) Is it a safe method? Why?

b) Is it series or parallel method to

connect a fuse in a circuit?

2Prepared by: Noushad Parappanangadi, Mob: 9447107327, 8301077327

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12. Write the reason for the following.

a) No electric shock for a bird sitting on

a phase line.

b) Gets electric shock for an elephant

touching its trunk to phase line.

c) It is not better to touch instrument

with wet hands.

HEAT 1. What are the units used for measuring

temperature?

2. Differentiate between vaporisation and

evaporation?

3. What are the factors that affect

evaporation?

4. Global warming effect the earth.

a) Write the reason for global warming?

b) What are the after effects of global

warming?

5. Find the heat to increase the

temperature of 2kg Iron from 300C to

600C?

6. Calculate the amount of heat used to

increase the temperature from 50C to

1000C of 100g water?

7. Fill in the blanks identifying the correct

relation.

Temperature: K; Latent heat of fusion:

…………

8. Give reason

a) Cool drinks get cooled faster on

placing at 00C ice than that at 00C

water.

b) Blister caused by steam is severe

than blister caused by boiling water

at same temperature.

9. On a day the increase in atmospheric

temperature is found to be 70C. What is

the corresponding increase in

temperature in

a) Fahrenheit Scale

12. What is the heat required to convert

100gm ice at 00C to steam at 1000C

(Specific heat capacity of water

=4200J/KgK, Latent heat of fusion of ice =

335x103 J/Kg, Latent heat of vaporization

of water = 226x104 J/Kg)

a) Find out the freezing point of the

liquid?

b) Why is the portion BC horizontal?

c) What is the state of substance

represented by CD?

d) What is the laboratory temperature?

COLOURS OF LIGHT 1. During sun rise and sun set sun

appears as red or orange red. This is

due to scattering of sunlight.

a) Define scattering of light?

b) Explain an experiment to show

the scattering of light on dust

particles?

2. a) During day time we cannot see

stars but we can see stars during day

time when we observe from moon.

Give reason?

b) What is the advantage of setting

telescopes on outer space of

earth?

b) Kelvin Scale

11. Doctors suggest keeping wet clothes on

the forehead of a person suffering from

severe fever. What is the advantage of

this?

10. A hot liquid at 90 C is taken in a test tube

and it is allowed to cool. The results

obtained are given in the graph. Analyse

the graph carefully and answer the

following questions.

0

0

c) Name a space telescope?

(0 C)

time (min)

tem

pera

ture


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3. What is the relation between

wavelength and deviation of colour

of light?

4. Why the black paper sees as black?

5. Match the following

A B

Infrared rays Used in mobile phone

Gama rays TV transmission

X rays Vitamin D

Radio waves Solar cells

Micro waves Greenhouse effect

Ultraviolet Diagnostic purpose

Visible light Used for cancer treatment

6. Explain the reason why infrared rays

are used to take photograph of

distant objects?

7. Write the relation between

wavelength and scattering of colours

of light?

8. What happened to a yellow lemon

when see through green, blue, cyan

filters?

9. What colour change occurs when

rotates the following disc fast?

10. What colour change occurs when the

following colours passes to a green

leaf?

a) Blue b) Yellow c) Magenta

11. Red colour is used as accident signals.

Why?

12. Rainbow looks like an arc. Explain?

13. What happened to the following

lights when passing through a prism?

Draw the figure.

a) Laser light

b) Yellow light

c) Visible light

ELECTRONICS AND MODERN TECHNOLOGIES 1. Identify the following electronic

components.

2. Identify the electronic components

related to the following units.

a) Henry b) Ohm c) Microfarad

3. What is meant by paper capacitor?

4. Explain about the forward biasing of

a diode?

5. Resistor and Inductor follow the

same function.

a) What is the advantage of

inductor?

b) What is the deficiency of this?

6. One diode is connected in the output

of a transformer.

a) Draw the output graph?

b) What is the function of diode

here?

7. A) What is meant by amplification?

c) Which electronic component is

used for this?

8. What are the advantages of Wi-Fi

system?

9. Write short notes about:

a) Photonics

b) Nano technology

c) Robotics

10. IC is a widely used electronic

component.

a) What are the components that

include in the IC?

b) What are the advantages of IC?

ENERGY MANAGEMENT 1. Categorise the following fuels as

solid, liquid and gas

[firewood, LPG, biogas, petrol, coal,

kerosene, CNG, water gas]

2. What are the problems of partial

combustion?

Blue

Green

Blue

Yellow

A B

A B C


3. What are the problems related to the

combustion of biomass?

4. Match the following suitably

A B C

Nuclear fuel

Silicon 0.4V

Sun Crude oil Rocket

Solar cell Hydrogen Uranium

Petrol Non renewable

Plasma

Oxygen Fractional distillation

5. “ Hydrogen may be the future fuel”

a) Can we use hydrogen as fuel daily

life?

b) Explain the reason?

6. Write the advantages of geothermal

power plant?

7. What are the characters of a model

fuel?

8. Write any instructions to reduce

energy crisis?

9. What are the products generated

when coal is distilled?

10. Match the following suitably

A B C Geothermal Motor

vehicle Complete combustion

Combustion Methane Non renewable

Biogas Burning gas

Calorific value

Hydrogen Oxygen Cow dung

Fossil fuel Magma Under the earth


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PERIODIC TABLE AND ELETRONIC CONFIGURATION 1. Arrange the following subshells as the

energy increasing level.

5p, 2s, 4f, 3s, 4s, 3d, 6s

2. Identify the wrong electronic

configuration and correct it?

3. Write the electronic configuration and

find the block, period and group of each?

4. Write the answers of the following

questions by using the given electronic

configurations?

a) Highly reactive metal?

b) Non-metal?

c) Element which produce coloured

compounds?

d) Element which includes in the

halogen group?

e) Which is the alkaline earth metal?

5. Haematite is the ore of Iron (Fe2O3)

a) Write the oxidation state of Fe in

Haematite?

b) How can we write the iron of Fe?

6. The 3d subshell of Zinc includes 10

electrons.

a) Write the subshell electronic

configuration?

b) Which is the atomic number of Zinc?

c) Write the symbol of Zinc ion and its

electronic configuration?

7. Which of the following statements

related to transition elements?

a) See in every state.

b) Produces coloured compounds.

c) Includes in s and p blocks.

d) Includes in d block.

e) All are metals.

f) Shows different oxidation states.

MOLE CONCEPT

1. Complete the table

Number

of moles

Mass in

gm Number

of molecules

Volume at

STP

Mole

2. Find the number of atoms:

a) 69gm Sodium

b) 128gm Sulphur

c) 71gm Chlorine

3. 2NO+O22NO2

a) Calculated the amount of NO2

produced while burning 30gm

NO?

b) How many gms of oxygen

required to burn 60gm NO?

c) Calculate the volume at STP of

NO2 produced while burning

300gm of NO?

4. How can we prepare the following

solutions?

a) 0.5 M NaOH solution

b) 2 M NaCl solution

5. Find the number of moles.

a) 160gm H2O

b) 5.6L of HI gas at STP

c) 6.022x1025 molecules of NH3

6. Find the GMM of the following.

a) 1s2, 2s2, 2p6, 3s2, 3p6, 3d9, 4s2

b) 1s1

c) 1s2, 2s2, 2p6

d) 1s2, 2s2, 2p6, 3s2, 3p2

a) X-27 b) Y-19 c) P-15

i) [Ne]3s1 iv) [Ar]3d2, 4s2

ii) [Xe]6s1 v) [Ne]3s2

iii) [Ne]3s2, 3p5

GMM

1

H2 2gm 2gm 6.022×1023 22.4 L

……… Cl2

142gm

35.5gm

…………………

………..

…….. NH3

26.022×1023 ………..

2.5 CO2

44 gm

………………… ………….

……. CH4

11.2 L

………….

………….

………….

……….

………. …………………

Mole

Mole

Mole

Mole

Mg (HCO3) 2Al (OH)3

[K2 Cr2O7]

3

l (

2 2 7

a)

b)

c)

O=16, Mg=24, H=l, C=12, Al=27, K=39, Cr=52

, g= , H=l, C=12, l= , = , r=

Atomic masses

6

CHEMISTRY


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a) The rate of chemical reaction is

different in each reaction. Why?

b) What is the function of MnO2, H3PO4

in this reaction?

2. Mg+2HCl MgCl2 + H2. Write three

methods to increase the rate of this

reaction?

3. +Heat. Write the

effects of the following factors in this

reaction.

a) Increasing the pressure

b) Added more N2

c) Remove the products

d) Increases the temperature

4. Write the effect of pressure in the

given reaction?

5. Match suitably

A B C

Catalyst Irreversible H2SO4 production

Equilibrium V2O5 Le-Chatlier Principle

Decompositi-on of H2O2

Reversible Oxygen gas

REACTIVITY SERIES AND ELECTRO CHEMISTRY

1. A small piece of Sodium, Lead, Iron,

Copper is deposited in water of four

vessels.

a) Which metal produces a gas?

b) What is the gas?

c) Write the balanced chemical

equation in this beaker?

2. Some metals are given below:

[Ag, Zn, Pb, Sn, Fe]

a) Which of the above metal acts as

anode in a galvanic cell?

3. Some activities are given below.

Answer the questions related to

these activities.

1) Electrolysis of fused NaCl

2) Electrolysis of NaCl solution

3) Electrolysis of CuCl2 solution

a) In which activity chlorine is

produced?

b) In which electrode that chlorine

deposited?

c) Which activity produces

hydrogen gas?

4. Write reason for the following

statements.

a) CuSO4 solution is not kept in Iron

vessel.

b) Magnesium is not used to make

boilers.

5. Correct the following statement if

there is any mistake.

a) Oxidation takes place in the

cathode of a Galvanic cell.

b) Anode of a Galvanic cell is

negative electrode.

c) Electric energy changes to

chemical energy in a Galvanic cell

METTALURGY

1. Arrange the table in the correct order

A B C

Aluminium Calamine Cu2O

Iron Cuprite ZnCO3

Zinc Bauxite Fe2O3

Copper Haematite Al2O3

2. Some methods of concentration of

ore is given below. Why this method

is used for those metals?

a) Bauxite – Leaching

b) Haematite – Magnetic separation

3. Write short note about:

a) Cast iron

b) Wrought iron

4. The ore bauxite is concentrated.

a) Which method is used?

b) What is the product after

concentration?

c) How metal is extracted from this

product?

RATE OF CHEMICAL REACTIONS AND CHEMICAL EQUILIBRIUM 1. Observe the given chemical reactions

and write answer to the following

questions.

ii) 2H2O2 -- 2H2O +O2

H3PO4

i) 2H2O2 -- 2H2O +O2

MnO2 (fast reaction)

(slow reaction)

N2 + 3H2 2NH3

parts and flow of electric

current?

H2 + I2 2HI + Heat

b) Draw the Zn-Fe cell and mark the 7


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d) Write the chemical equations in

the anode and cathode at this

reaction?

5. Write the complete steps of chemical

equations occurred in the blast

furnace?

NAMING OF ORGANIC COMPOUNDS

1. Write the IUPAC name of the given

compounds.

2. Frame the structure of the following

organic compounds.

a) 2–methyl pentane

b) 3 - ethyl hexane

c) 2,2,3 – trimethyl pentane

d) 4 – ethyl-2-methyl pentane

e) 4-ethyl-2-methyl hexane

f) 4-ethyl-2,5-dimethyl heptane

3. Observe the given structure

a) How many number of carbon atoms

in the longest chain of this

compound?

b) Write the names of branches?

c) Write IUPAC name of this compound

a) 2-methoxu butane b) Pentanal

c) Heptan-2-ol d) Propanone

5. Given C3H8O

a) Draw the possible structures

using the given compound?

b) Write IUPAC names of these?

c) Identify the isomer pairs and give

the name of that pairs?

6. Complete the table

Molecular Formula

Possible Structures

IUPAC names

C5H12 a) d)

b) e)

c) f)

C3H6O g) h)

i) j)

CHEMICAL REACTIONS OF ORGANIC COMPOUNDS

1. Identify the given reactions

2. Complete the following chemical

equations.

3. Given some molecular formula.

a) Which of them is an aromatic

compound?

b) Which of this is used in food?

c) Which is the monomer of

polyethylene?

(a) CH3−CH

2−CH

2Cl

(c)

CH3−C−CH−CH

3

Cl

ClCl

(d)

(e)

CH3−CH

2−CH−CH

3

OH

(f)

CH3−CH−CH−CH

3

OH

OH

CH3−CH

2−CH

2−CH

2−COOH

CH3−O−CH

2−CH

3

(b)

CH2 = CH

2 + Cl

2

CH3Cl + HClCH

4 + Cl

2

[−CH2−CH

2−]nnCH

2 = CH

2

CH4 + CH

2 = CH

2CH

3−CH

2−CH

3

4Co2 + 5H

2OC

4H

10+ 13/2 O

2

CH2Cl

− CH

2Cl

CH CH + H

2 A

A + Cl2 B

à

à

àCH2= CH

2 + H

2A

àA + Cl2

B + C

a)

b)

sunlight

A) C2H4 B) C6H14

C) CH3-CH2-Cl

D) CH3-COOH

E) C6H6

4. Identify the functional groups of the

following:

CH3

CH2

CH3-CH2-CH-CH-CH2-CH-CH3

CH3 CH2

CH3

d) Which of them conducts substitution

reaction? 8


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4. Answer to the following questions.

a) The process of manufacturing

ethanol from sugar solution.

b) The enzymes used in this

reaction.

c) The monomer of PVC.

d) The products of propane after

thermal cracking.

5. Methyl ethanoate is an ester.

a) Which acid is in this?

b) Which alcohol is in this?

c) Write the chemical equation to

produce this ester?

d) Write the uses of ester?

CHEMISTRY IN PROGRESS OF MANKIND

1. Petrol, Diesel is extracted from crude

oil.

a) Name the extraction process?

b) Write two uses of paraffin wax?

2. What are analgesics? Give an

example?

3. Write a short note about setting of

cement?

4. What are the problems raised due to

self-treatment?

5. Which glasses are selected to the

following uses?

a) Lens production.

b) Lab equipment

c) Mirror production

6. Write the advantages of green

chemistry?


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EM AMPLE UESTIONS - WordPress.com · S AMPLE Q UESTIONS. PHYSICS & CHEMISTRY EM Prepared by: Noushad Parappanangadi, Mob: 9447107327, 8301077327