Lakhmir Singh solutions for फिज़िक्स [इंग्रजी] इयत्ता १० chapter 3 - Sources of Energy [Latest edition]

Name a non-renewable source of energy other than fossil fuels. 

Define calorific value of a fuel. 

"The calorific value of cooking gas (LPG) is 50 kJ/g". What does it mean? 

Which of the following produces more heat (per unit mass) on burning?

Define ignition temperature of a fuel.

"The ignition temperature of a fuel is 80°C". What does this mean?

State any four characteristics of a good source of energy.

What is meant by a non-renewable source of energy? Give two examples of non-renewable source of energy. 

What is the difference between a renewable and a non-renewable source of energy? Explain with examples.

Why are fossil fuels classified as non-renewable source of energy? 

Name two sources of energy that you think are renewable. Give reason for your choice.

Name two sources of energy which you consider to be non-renewable. Give reason for your choice. 

Classify the following into renewable and non-renewable sources of energy:
Coal, Wind, Tides, Petroleum,Wood, Natural gas 

 Classify the following  

Coal, Wind, Tides, Petroleum,Wood, Natural gas

What is the basis of above classification?  

Coal is said to be formed from the wood of trees. Why then is coal considered to be a non-renewable source of energy whereas wood is a renewable source of energy?

What is a fuel? Give five examples of fuels.

What are the characteristics of an ideal fuel (or good fuel)?

The calorific value and ignition temperature of fuel A are 55 kJ/g and 80°C, respectively. These values for fuel B are 80 kJ/g and 10°C, respectively. On burning, the fuel A produces CO₂ and H₂O while the fuel B produces CO₂ , CO and SO₂. Give three points of relative and disadvantages of these two fuels.

An examples of a renewable source of energy is:

(a) petrol
(b) natural gas
(c) biogas
(d) kerosene

A non-renewable source of energy is:

(a) wood
(b) alcohol
(c) hydrogen gas
(d) natural gas

Which of the following is not a renewable source of energy?

(a) wind
(b) flowing water
(c) fossil fuels
(d) fuel wood

A good fuel is one which possesses:

(a) high calorific value and low ignition temperature
(b) high calorific value and high ignition temperature
(c) high calorific value and moderate ignition temperature
(d) low calorific value and moderate ignition temperature

The fuel having a calorific value of 55 kJ/g is likely to be:

(a) biogas
(b) methane gas
(c) hydrogen gas
(d) natural gas

A newly planted sapling usually grows and matures into a tree in more than:

(a) 50 years
(b) 25 years
(c) 45 years
(d) 15 years

Which of the following fuels has the highest calorific value?

(a) natural gas
(b) methane gas
(c) hydrogen gas
(d) biogas             

The fuel having the lowest calorific value is:

(a) coal
(b) wood
(c) charcoal
(d) kerosene 

There are four fuels which all contain only carbon and hydrogen. The fuel having highest calorific value will be one which has:

(a) more of carbon but less of hydrogen
(b) less of carbon but more of hydrogen
(c) equal proportions of carbon and hydrogen
(d) less of carbon as well as less of hydrogen

One of the following is not a characteristic of a good fuel. This is:

(a) high calorific value
(b) no emission of smoke
(c) smooth burning
(d) high ignition temperature

Which of the following is not a fossil fuel?

(a) coal
(b) petroleum gas
(c) biogas
(d) natural gas

The calorific values of three fuels A, B and C are 33 kJ/g, 48 kJ/g and 150 kJ/g, respectively. A is solid, B is liquid and C is a gas at room temperature. One combustion, both A and B produce carbon dioxide while C explodes forming steam. B and C leave no residue after combustion while A leaves behind some solid residue. Which one of the three fuels is the most ideal? Give two reasons to support your answer.

Calorific value and ignition temperature of fuel X are 75 kJ/g and 20°C respectively. These values for fuel Y are 50 kj/g and 75°C respectively. On burning, the fuel Y produces only CO₂while fuel X produces CO₂ and CO. Which of the two is a better fuel? Give two reasons to support your answer.

The calorific values of five fuels A, B, C, D and E are given below:

Arrange the following fuels in the order of decreasing calorific values (keeping the fuel with highest calorific value first):
Biogas, Kerosene, Wood, Petrol, Hydrogen gas, Methane 

Arrange the following fuels in the order of increasing calorific values (keeping the fuel with lowest calorific value first):
LPG, Coal, Alcohol, Dung cakes, Diesel 

Most of the fuels contain carbon as one of the constituents. Name a fuel which has very high calorific value but not contain carbon.

Name the product of petroleum that is used to drive heavy vehicles.

Give one example of a good domestic fuel. 

Name any one hydrocarbon fraction obtained during the fractional distillation of petroleum which is used as a domestic fuel.

Name any four fractions obtained from petroleum which are used as fuels.

What is the composition of liquefied petroleum gas (LPG)? 

Which gaseous fuel is being used increasingly in transport vehicles like cars and buses these days? 

Write the full forms of CNG and LPG.

What is the main constituent of:

(1) petroleum gas?
(2) natural gas?

Name the component which is found in natural gas well as in biogas. 

State two important uses of natural gas

State one important use of CNG these days.

Complete the following sentence: 

Domestic gas cylinders like Indane contain mainly .............. 

Explain why, natural gas is considered to be a good fuel.

What is meant by conventional sources of energy? Write the names of two conventional sources of energy. 

Explain the principle of working of a thermal power plant. Draw labelled diagram to illustrate your answer. 

What are the disadvantages of burning fossil fuels?

Write a short note on the pollution caused by burning fossil fuels. 

What are the various steps which can be taken to control (or reduce) pollution caused by burning fossil fuels? 

If you could use any source of energy for heating your food, which one would you use and why?

Why is LPG considered a good fuel? 

Why is LPG considered a better fuel than coal?

Why is the leakage of LPG detected easily although it is odourless? State the steps to be taken in case its leakage is detected in the kitchen.

 What are fossil fuels? Give three examples of fossil fuels.

 Describe how fossil fuels were formed.

Explain how, sun is considered to be the ultimate source of fossil fuels

Which fossil fuels were formed by the buried remains of small plants and animals?

Which fossil fuel formed by the buried remains of large land plants? 

The main constituent of petroleum gas is:

(a) methane
(b) ethane
(c) butane
(d) propane 

The natural gas consists mainly of:

(a) methane
(b) ethane
(c) propane
(d) butane 

Which of the following is not produced by the burning of fossil fuels?

(a) nitrogen oxides
(b) sulphur oxides
(c) sodium oxides
(d) carbon oxides

The product of petroleum used to drive heavy vehicles like trucks is:

(a) petrol
(b) kerosene
(c) diesel
(d) carbon oxide

The aviation fuel which is used in the engines of jet aeroplanes is:

(a) diesel
(b) kerosene
(c) petrol
(d) CNG

The ultimate source of energy stored in fossil fuels is:

(a) moon
(b) earth
(c) sun
(d) sea

Which of the following is not a fossil source of energy?

(a) kerosene oil
(b) cow-dung cakes
(c) CNG
(d) coal

The fuel which is not used at thermal power plants is:

(a) coal
(b) uranium
(c) natural gas
(d) fuel oil

LPG consists mainly of:

(a) butane
(b) ethane
(c) butanone
(d) methane

Coke is move valuable when used:

Coal cannot be converted into one of the following forms of energy. This is:

(a) coal gas
(b) electricity
(c) oil
(d) charcoal

One of the following does not contribute to acid rain. That is:

(a) nitrogen monoxide
(b) sulphur dioxide
(c) carbon monoxide
(d) carbon dioxide

Fossil fuels are energy rich compounds of an element X which were originally made by the plants with help of sun's energy. 

Name the element X. 

Fossil fuels are energy rich compounds of an element X which were originally made by the plants with help of sun's energy. 

Name another element which is usually found in combination with X in fossil fuels.

The energy in petrol originally came from the sun. Explain how it got into petrol. 

A substance X is added to LPG cylinders while filling so as to make the detection of leakage of LPG from the cylinder easy. 

Name the substance X.

A substance X is added to LPG cylinders while filling so as to make the detection of leakage of LPG from the cylinder easy.     

 How does substance X make the detection of leakage of LPG easy? 

The pollution of air caused by burning petroleum fuels (like petrol and diesel) in vehicles can be controlled by fitting a device X in the exhaust system of vehicles. 

Name the device 

The pollution of air caused by burning petroleum fuels (like petrol and diesel) in vehicles can be controlled by fitting a device X in the exhaust system of vehicles. 

 How does this device help in controlling air pollution? 

A hydro-power plant converts one form of energy into another. Name the two forms of energy. 

What type of energy is possessed by flowing water? 

Flowing water can rotate a turbine. Which type of energy is used up by the turbine? 

Name the original source of wind energy. 

What should be the minimum wind speed for the satisfactory working of a wind-powered electric generator?

Write one use of wind energy

(a) in the past

Why is the copper tube of a solar water heater painted black from outside? 

Fill in the following blank with a suitable word:

The amount of heat produce by burning a unit mass of a fuel completely is known as its ............ value.

What is a source of energy? What are the two main categories of the sources of energy? 

What type of reactions occurring inside the sun produce solar energy? 

Name some of the solar energy devices.

What type of reflector is used in a box-type solar cooker? 

What is the range of temperature which can be achieved in a box-type solar cooker in two to three hours?

What is the range of temperature which can be achieved in a box-type solar cooker in two to three hours?

Name the device which converts sunlight into electricity.

How much solar energy will be received by 1 m² area in one hour if the solar constant be 1.4 kW/m²?

Fill in the following blank with suitable word:
A solar cell converts ................ energy into ................ energy.

 What is the difference between a thermal power plant and a hydro power plant? 

Which of the two causes serious air pollution and how?

Compare the sun and the fossil fuels as the sources of energy. 

What kind of mirror – concave, convex or plain – would be best suited for use in a solar cooker? Why?

 Name that part of a box-type solar cooler which allow the sun's heat rays to enter the box but does not allow inside heat to go out.

Explain why, a plane mirror reflector is used in a box-type solar cooker.

What are the advantages and disadvantages of using a solar cooker? Are there places where solar cookers would have limited utility?

 What is a solar cell? Draw the labelled diagram of a solar cell. 

Name the semi-conductor material which is usually used for making solar cells.

 Write the uses of solar cells. 

State the advantages and disadvantages of using solar cells.

What is a solar cell panel? For what purpose is it used? State its two main advantages.

What is solar constant? What is the value of solar constant?

 If the energy received by 5 m² area in 10 minutes is 4200 kJ, calculate the value of solar constant.

How has the traditional use of energy of flowing water been modified for our convenience?

How has the traditional use of energy of wind energy been modified for our convenience?

What is hydroelectricity? Explain the basic principle of generation of hydroelectricity with the help of a labelled diagram. 

 State two advantages of producing hydroelectricity.

State two disadvantages of producing hydroelectricity.

 With the help of a labelled diagram, explain the construction and working of a solar cooker.

Why is the solar cooker box painted black from inside?

Why is the solar cooker box covered with a glass sheet?

 What is wind? What type of energy is possessed by wind?

 Explain how, wind energy can be used to generate electricity. Illustrate your answer with the help of a labelled diagram.

State two advantages of using wind energy for generating electricity.

Mention two limitations of wind energy for generating electricity.

A solar water heater cannot be used to get hot water on

At a hydro power plant:

(a) kinetic energy possessed by stored water is converted into electrical energy
(b) electrical is extracted from water
(c) water is converted into steam to turn turbines and produce electricity.
(d) potential energy possessed by stored water is converted into electricity.    

The part of box-type solar cooker which is responsible for producing greenhouse effect is:

(a) plane mirror reflector
(b) black coating inside the box
(c) glass sheet cover
(d) utensils placed in the cooker box

Solar cells are made of:

(a) conductors
(b) insulators
(c) semi-conductors
(d) super-conductors

The value of solar constant is:

(a) 1.4 kWh
(b) 1.4 kW/m
(c) 1.4 kW/m²
(d) 1.4 kW/m³

The radiations present in sunlight which make a solar cooker work are:

(a) visible light rays
(b) ultraviolet rays
(c) comic rays
(d) infrared rays

In order to make an efficient solar cooker, the cover of the cooker box should be made of:

The minimum speed of wind necessary for the satisfactory working of a wind generator to produce electricity is about:

(a) 15 km/h
(b) 25 km/h
(c) 35 km/h
(d) 45 km/h

If the solar constant is 1.4 kW/m² then solar energy recived by 1m²area in one hour is:

(a) 5040 J
(b) 504.0 kJ
(c) 5040 kJ
(d) 5.04 kJ

A solar cooker may not cook food if

(a) the solar cooker is not placed in the shade
(b) the glass sheet cover of solar cooker is not closed
(c) a convex mirror reflector is not used

A large coal-fired power station produces 2000 MW of electrical energy. A wind turbine with 33 m blades can produce 300 kW. 

How many turbines would be needed to replace the power station? 

A large coal-fired power station produces 2000 MW of electrical energy. A wind turbine with 33 m blades can produce 300 kW. 

Why, in actual practice, this number of turbines could not replace the coal-fired power station?

In a solar water heater, why is the storage tank placed at a higher lever than the solar panel containing coils?

In many applications, solar cells are connected to rechargeable batteries. Why is this so?

 Solar cells are used to provide the electric current to charge the batteries of a car driven by an electric motor. Describe the energy changes which take place.

 What differences would you expect in the charging of car batteries (i) in bright sunlight (ii) on a cloudy day (iii) at night? 

What substance is obtained as a residue when wood is burned in a limited supply of air?

Name one source of energy which is not derived from solar energy directly of indirectly.

What name is given to the heat energy obtained from hot rocks inside the earth?

Name the agent which decomposes animal dung into biogas.

Which component of biogas is used as a fuel?

Name the constituents of biogas.

Which of the following is needed for the formation of biogas from cow-dung and which not?
Water, Oxygen

Name the clean fuel which can be obtained from cow-dung. 

Apart from cattle dung, what other substances can be added to a biogas plant?

Name any three forms of energy which could be harnessed from the sea.

Write two forms in which solar energy manifests itself in sea.

Write the full from of OTE.

What is the function of anaerobic micro-organisms such as anaerobic bacteria in a biogas plant?

State whether the following statement is true or false:
Tidal energy is one of the forms in which solar energy manifests itself in oceans.

Fill in the following blank with suitable word:       

Biomass is another form in which ........... energy manifests itself.

Fill in the following blank with suitable word: 

Tidal waves build up and recede ........... a day.

What is biomass? Give three examples of biomass. 

Name the biomass which is still widely used as a source of heat energy in many household of our country.

What are the two ways in which cow-dung can be used as a fuel? Which of them is better and why?

Compare and contrast biomass and hydroelectricity as sources of energy.  

Why is biogas considered an ideal fuel for domestic use?

 Explain how tidal energy can used to generate electricity? 

Why is tidal energy not likely to be a potential source of energy?

State two ways in which the energy of sea-waves can be harnessed.

What is meant by ocean thermal energy? Explain how ocean thermal energy can be used to generate electricity.

Suggest a safe and efficient method for the disposal of biowastes and sewage materials. How is this method advantageous to us?

Which of the following sources of energy are not derived from the sun?
Biomass, Wind, Ocean thermal energy, Geothermal energy, Nuclear fuels, Hydroelectricity, Wave energy, Coal, Petroleum, Tidal energy

What is biogas?

Name the major component of biogas.

 What are the raw materials used for making biogas?

Describe the construction and working of a biogas plant with the help of a labelled diagram.

Write any two uses of biogas.

 Write any two advantages of using biogas.

What is geothermal energy?

 What is the source of heat contained in geothermal energy? 

 Explain how, geothermal energy is used to generate electricity.

State two advantages of geothermal energy.

State two disadvantages of geothermal energy.

Which of the following is not an example of a biomass energy source?

(a) wood
(b) biogas
(c) atomic energy
(d) cow-dung

Most of the sources of energy that we sue represent stored solar energy. Which of the following is not ultimately derived from the sun's energy?

(a) wind energy
(b) geothermal energy
(c) fossil fuels
(d) biomass

The constituent of biogas which makes it an excellent fuel is:

(a) butane
(b) methane
(c) propane
(d) ethane

The major component of biogas is:

(a) hydrogen
(b) butane
(c) hydrogen sulphide
(d) methane

Which of the following is more environment friendly??

(a) burning of diesel
(b) burning of coal
(c) burning of charcoal
(d) burning of wood

Which one of the following is not renewable energy technology?

The rise of sea water during high tide is caused by the gravitational pull of the:

One of the following is not required in the formation of biogas in a biogas plant. This is:

(a) cow-dung
(b) water
(c) oxygen
(d) anaerobic bacteria

The fuel which is not obtained from biomass is:

(a) firewood
(b) cow-dung cakes
(c) coke
(d) charcoal

The non-renewable source of energy among the following is:

(a) hydroelectricity
(b) sewage gas
(c) natural gas
(d) gobar gas

Geothermal energy is produced by the:

(a) fission of radioactive materials
(b) burning of coal inside the coal mines
(c) combustion of natural gas deep inside the earth
(d) fusion of radioactive substances

The harnessing of which of the following leads to the destruction of large eco-systems?

(a) thermal power
(b) tidal power
(c) hydro power
(d) geothermal power

The harnessing of which of the following leads to the destruction of large eco-systems?

(a) thermal power
(b) tidal power
(c) hydro power
(d) geothermal power

A certain form of energy is available due to the difference in the temperature of water at the surface of the ocean and its deeper levels.

(a) Name the form of energy.
(b) Is this energy ultimately derived from the sun or not?
(c) Explain how this form of energy can be converted into electricity.
(d) What is the minimum temperature difference in water at the surface of ocean and its deeper level which is required to operate power plants based on is energy?

The gravitational pull of the moon cause the sea-water to rise periodically.

(a) What name is given to the condition of the sea when water to rise periodically.
(b) What name is given to the condition of the sea when its raised water recedes?
(c) What name is given to the energy which can be harnessed from this natural phenomenon?
(d) Draw labelled diagram to show how this energy can be harnessed from this natural

When the material A mined from the earth is heated strongly in an insufficient supply of air, it produces a solid fuel B which consists mainly of carbon. When another material C obtained from trees is heated in an insufficient supply of air, it produces another solid fuel D which also consists mainly of carbon. Name A, B, C and D

A certain form of energy which is not sourced directly or indirectly from the sun and does not cause any pollution is very easily converted into electricity. This form of energy is, however, not available everywhere. Moreover, it is technically very difficult and expensive to obtain it. Name the form of energy.

What type of nuclear reaction is responsible for the liberation of energy: 

 in a nuclear reactor?

What type of nuclear reaction is responsible for the liberation of energy:  

 in the sun?

Which produced of the nuclear fission of uranium-235 is utilised to cause further fission of its nuclei?

Which particles bring about the fission of uranium-235?

State whether the fission of uranium-235 is caused by low energy neutrons or high energy neutrons.

Name the type of nuclear reaction which is involved in the working of: 

 a hydrogen bomb.

Name the type of nuclear reaction which is involved in the working of: 

an atom bomb.

Name the moderator used in a nuclear reactor. 

Of what material are the control rods of a nuclear reactor made?

What do you think is the purpose of the thick, concrete chamber surrounding the reactor of a nuclear power plant?

Where, in a nuclear power station, is uranium used up?

State one use of nuclear fission reactions. 

How many MeV are equivalent to 1 atomic mass unit (u)?

Fill in the following blank with suitable word: 

Splitting of a heavy nucleus into two lighter nuclei is called ........

Fill in the following blank with suitable word: 

Uranium-235 atoms will split when hit by .......... This is called ...........

 Fill in the following blank with suitable word: 

Nuclear .......... is used in nuclear power stations for the production of electricity. 

Fill in the following blank with suitable word: 

 In a nuclear power station, nuclear fission takes place in the .............

What is nuclear fission? Explain with an example. Write the equation of the nuclear reaction involved.

 What is nuclear fusion? Explain with an example. Write the equation of the reaction involved. 

 Why are very high temperatures required for fusion to occur? 

What is the nuclear fuel in the sun ?

Describe the process by which energy is released in the sun. Write the equation of the nuclear reaction involved. 

Write Einstein's mass-energy equation. Give the meaning of each symbol  which occurs in it.

 If 25 atomic mass units (u) of a radioactive material are destroyed in a nuclear reaction, how much energy is released in MeV?

 What is the source of energy of the sun and other stars?

 What is common between the sun and a hydrogen bomb?

 Describe the working of a hydrogen bomb.

 What will happen if slow moving neutrons are made to strike the atoms of a heavy element  `''235_92U`? What is the name of this process?

Name one installation where such a process is utilised. 

What are the advantages of nuclear energy?

State the disadvantages of nuclear energy.

The following question are about the nuclear reactor of a power plant.  

Which isotope of uranium produces the energy in the fuel rods?

The following question are about the nuclear reactor of a power plant. 

Will the fuel rods last for ever?

The following question are about the nuclear reactor of a power plant. 

Is the energy produced by nuclear fission or nuclear fusion? 

The following question are about the nuclear reactor of a power plant. 

What is the purpose of using the graphite moderator?

The following question are about the nuclear reactor of a power plant. 

What is the function of boron rods in the nuclear reactor?

The following question are about the nuclear reactor of a power plant.

Why is liquid sodium (or carbon dioxide gas) pumped through the reactor? 

In the reactor of a nuclear power plant, name the material which is used:

(a) as a moderator
(b) to absorb radiations
(c) in the fuel rods
(d) in the control rods
(e) to carry away heat

In the nuclear reactor of a power plant: 

how do control rods control the rate of fission?

how is heat removed from the reactor core, and what use is made of this heat?

How does inserting the control rods in the graphite core affect the fission in the reactor? Explain your answer.

What are the advantages and disadvantages of using nuclear fuel for generating electricity? 

What is a nuclear reactor? What is the fuel used in a nuclear reactor?

With the help of a labelled diagram, describe the working of a nuclear power plant 

 How is the working nuclear reactor of a power plant shut down in an emergency?

Name five places in India where nuclear power plants are located.

 Differentiate between nuclear fission and nuclear fusion. 

Which of the two, nuclear fusion and nuclear fusion,  is made use of:
(1) for the production of electricity?
(2) for making a hydrogen bomb?

Which produces more energy : nuclear fusion or nuclear fission? 

 Calculate the energy released in joules when 5 g of a material is completely converted into energy doing a nuclear reaction.

 How much is this energy in MeV? (Speed of light = 3 × 10⁸ m/s)

Which of the following is used as a moderator in the reactor of a nuclear power station?

(a) liquid sodium
(b) boron
(c) graphite
(d) carbon dioxide

The control rods used in the reactor of a nuclear power plant are made of:

(a) steel
(b) graphite
(c) uranium
(d) boron

In a nuclear power plant, coolant is a substance:

(a) which cools the hot, spent steam to condense it back to water
(b) which transfers heat from reactor to water in heat exchanger
(c) which is boiled to make steam to turn the turbine
(d) which cools the generator coils to prevent their overheating.

Which of the following is ultimately not derived from the sun's energy (or solar energy)?

(a) wind energy
(b) nuclear energy
(c) biomass energy
(d) ocean thermal energy

One atomic mass unit (u) is equivalent to an energy of:

The energy in the reactor of a nuclear power station is produced by the process of:

(a) nuclear diffusion
(b) nuclear fission
(c) nuclear fusion
(d) nuclear fermentation

One eV (electron volt) of nuclear energy is equivalent of:

(a) 1.6 × 10⁻¹⁴ J
(b) 1.6 × 10⁻¹² J
(c) 1.6 × 10⁻¹⁹ J
(d) 1.6 × 10⁻¹³ J

Which of the following can be produced during the nuclear fission as well as nuclear fusion reactions?

(a) protons
(b) deutrons
(c) electrons
(d) neutrons

Nuclear fission reactions are not a source of energy for one of the following. This is:

(a) atom bomb
(b) power plants
(c) sun
(d) pacemaker

The source of energy of the sun is:

(a) conversion of hydrogen gas into helium
(b) conversion of carbon fuel into carbon dioxide
(c) burning of hydrogen gas present in the sun
(d) disintegration of uranium into barium and krypton

An uncontrolled nuclear chain reaction forms the basis of:

(a) nuclear power plant
(b) hydrogen bomb
(c) thermal power station
(d) atom bomb

One MeV of nuclear energy is equivalent to:

(a) 1.6 × 10⁻¹³ J
(b) 1.6 × 10⁻¹⁹ J
(c) 1.6 × 10⁻¹⁶ J
(d) 1.6 × 10⁻¹⁵ J

One type of energy which has not been controlled so far is:

(a) ocean thermal energy
(b) nuclear fusion energy
(c) geothermal energy
(d) nuclear fission energy

The heat energy released during nuclear fission and fusion is due to the:

(a) conversion of stored chemicals into energy
(b) conversion of momentum into energy
(c) conversion of mass into energy
(d) conversion of magnetism into energy

Which of the following can undergo nuclear fusion reaction?

(a) uranium
(b) deuterium
(c) barium
(d) krypton

The disposal of waves produced in a nuclear power plant poses a big problem because it is:

(a) too heavy
(b) highly inflammable
(c) extremely foul smelling
(d) highly radioactive

A nuclear reaction is represented by the following equation:    

`""_92^235U+_0^1n-> _56^139Ba+_36^94Kr+xc+E`  

Name the process represented by this equation and describe what takes place

A nuclear reaction is represented by the following equation:

`""_92^235U+_0^1n-> _56^139Ba+_36^94Kr+xc+E`  

 Identify the particle c and the number x of such particles produced in the reaction.

A nuclear reaction is represented by the following equation:

`""_92^235U+_0^1n-> _56^139Ba+_36^94Kr+xc+E`  

 What does E represent?

A nuclear reaction is represented by the following equation:

`""_92^235U+_0^1n-> _56^139Ba+_36^94Kr+xc+E`  

 Name one installation where the above nuclear reaction is utilised.

A nuclear reaction is represented by the following equation:

`""_92^235U+_0^1n-> _56^139Ba+_36^94Kr+xc+E`   

What type of bomb is based on similar type of reaction?

A nuclear reaction is represented by the equation: 

`""_1^2H+_1^2H->_2^3He+xc+E`  

Name the process represented by this equation and describe what happens during this reaction.

A nuclear reaction is represented by the equation: 

`""_1^2H+_1^2H->_2^3He+xc+E`   

 Identify the particle c and the number x of such particles produced in the reaction.

A nuclear reaction is represented by the equation: 

`""_1^2H+_1^2H->_2^3He+xc+E`    

What does E represent?

A nuclear reaction is represented by the equation: 

`""_1^2H+_1^2H->_2^3He+xc+E`    

State two conditions under which such a reaction takes place.

A nuclear reaction is represented by the equation: 

`""_1^2H+_1^2H->_2^3He+xc+E`   

What type of nuclear bomb is based on similar reactions?

The mass numbers of four elements A, B, C and D are 2, 20, 135 and 235, respectively. Which one of them will be most suitable to make:

(i) an atom bomb, 

The mass numbers of four elements A, B, C and D are 2, 20, 135 and 235, respectively. Which one of them will be most suitable to make: 

a hydrogen bomb?

A nuclear power plant is working normally. What would you do if the reactor core suddenly got too hot?

Explain why, in a nuclear reactor, the chain reaction stops if the control rods are fully inserted into the graphite.

Which of the two is a cleaner fuel: hydrogen of CNG? Why?

Which of the two is more energy efficient: filament type electric bulb or CFL? Why? 

How long are the energy resources of the earth like coal, petroleum and natural gas expected to last?

Name two devices which can be utilised for the cooking of food so as to save fuel.

What are the various factors which we should keep in mind while choosing a source of energy?

Can any source of energy be pollution free? Explain your answer with an example.

What are the environmental consequences of the increasing demand for energy?

What steps would you suggest to reduce energy consumption?

The major cause of environmental pollution is the use of:

(a) hydrogen as fuel
(b) biomass energy
(c) ocean energy
(d) fossil fuels

The world's known coal reserves are expected to last for about:

(a) 200 years
(b) 400 years
(c) 500 years
(d) 100 years

The fossil fuel whose known reserves in the earth are expected to last for the minimum period is:

(a) coal
(b) uranium
(c) petroleum
(d) natural gas