Tag: substances, objects and energy

Questions Related to substances, objects and energy

Consider the following two statement 
A) Linear momentum of a system of particles is zero.
B) Kinetic energy of a system of particles is zero 

evs - i substances, objects and energy renewable resources alternative fuels and energy sources alternative sources of energy

  1. A does not imply B and B does not imply A

  2. A Implies B but B does not imply A

  3. A does not imply B but B implies A

  4. A implies B and B implies A

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Correct Option: A

The kinetic energy of an electron which is accelerated through a potential of $100$ volts is?

evs - i substances, objects and energy renewable resources alternative fuels and energy sources alternative sources of energy

  1. $1.602\times 10^{-17}$ joules

  2. $418.6$ calories

  3. $1.16\times 10^4$ eV

  4. $6.626\times 10^{-34}$ watt-second

Show answer
Correct Option: A
Explanation:

According to de Broglie equation,Wavelength associated with an electron through potential difference V is given as

$\lambda =\frac { 12.27 }{ \sqrt { V }  } A=\frac { 12.27 }{ \sqrt { 100 }  } A=\frac { 12.27 }{ 10 } A=1.227A$

When an object is made up of n number of particles we refer to it (object) as a system of Particles

evs - i substances, objects and energy renewable resources alternative fuels and energy sources alternative sources of energy

  1. True

  2. False

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Correct Option: A
Explanation:

According to definition of system of particles

"When a object is made up of more than 1 particle then we refer that object to be as a system of particles

Hydrogen fuel is used in:

chemistry occurrence of carbon compounds in nature substances, objects and energy alternative fuels and energy sources alternative sources of energy

  1. liquid-propellant rockets

  2. portable fuel cell applications

  3. cars

  4. all of above

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Correct Option: D
Explanation:

Hydrogen fuel can provide motive power for liquid-propellant rockets, cars, boats and airplanes, portable fuel cell applications or stationary fuel cell applications, which can power an electric motor. The problems of using hydrogen fuel in cars arise from the fact that hydrogen is difficult to store in either a high pressure tank or a cryogenic tank.

We can save energy by :

chemistry occurrence of carbon compounds in nature substances, objects and energy alternative fuels and energy sources alternative sources of energy

  1. buying expensive cars

  2. using aeroplanes

  3. using CFL

  4. using ships

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Correct Option: C
Explanation:

Simple things like switching off fans and lights when not in use, using maximum daylight, walking instead of driving for short distances, using CFL instead of traditional bulbs, proper insulation for leakage of energy can go a long way in saving energy.


Hence the correct option is C.

Which of the following is/are the method(s) of controlling hydrocarbons from production?

chemistry occurrence of carbon compounds in nature substances, objects and energy alternative fuels and energy sources alternative sources of energy

  1. Adsorption

  2. Condensation

  3. Gas Absorption

  4. All of the above

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Correct Option: D
Explanation:

The methods of controlling hydrocarbons from production are

  1. Adsorption
  2. Condensation
  3. Gas absorption

What is the effect of strike of unions in oil producing companies?

chemistry occurrence of carbon compounds in nature substances, objects and energy alternative fuels and energy sources alternative sources of energy

  1. decrease in price of oil

  2. cause an energy crisis.

  3. suspension of unions by Govt.

  4. increase in the selling of cars

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Correct Option: B
Explanation:

A strike by unions in an oil producing firm can definitely cause an energy crisis.

What are the disadvantages of renewable energy?

chemistry occurrence of carbon compounds in nature substances, objects and energy alternative fuels and energy sources alternative sources of energy

  1. They are eco-friendly

  2. They cannot be used in war

  3. Proper equipment to convert those energy into useful form is not available easily

  4. They are non-renewable

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Correct Option: C
Explanation:

There are many advantages of renewable energy but the only disadvantage is that proper equipment for their conversion are not easily available. Either they are very costly or not easily available.

Which of the following measures can help in controlling hydro carbon pollution

chemistry occurrence of carbon compounds in nature substances, objects and energy alternative fuels and energy sources alternative sources of energy

  1. Less usage of automobile

  2. controlling population

  3. A,B

  4. Nne

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Correct Option: C
Explanation:

Less usage of automobiles and controlling population he following measures can help in controlling hydro carbon pollution
Hence option C is the correct answer.

Hydrogen is a cleaner fuel than $CNG.$ 

chemistry occurrence of carbon compounds in nature substances, objects and energy alternative fuels and energy sources alternative sources of energy

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Hydrogen gas is cleaner fuel than $CNG$ as $CNG$ contains hydrocarbons which in turn contains carbon and it is a form of pollutant present in $CNG.$  But hydrogen is waste-free. The fusion of hydrogen does not produce any waste and therefore it is cleaner than $CNG.$