Tag: substances, objects and energy

Quizzes (5) Questions (175)

Questions Related to substances, objects and energy

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

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

If the kinetic energy of a system of particles is zero, every particle must have zero velocity, which means the linear momentum must also be zero (so B implies A). However, if the linear momentum is zero, individual particles can still be moving in opposite directions with equal and opposite momenta, meaning kinetic energy is not necessarily zero (so A does not imply B).

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

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

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

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

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

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

Hydrogen fuel is used in:

  1. liquid-propellant rockets

  2. portable fuel cell applications

  3. cars

  4. all of above
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

We can save energy by :

  1. buying expensive cars

  2. using aeroplanes

  3. using CFL

  4. using ships
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

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

  1. decrease in price of oil

  2. cause an energy crisis.

  3. suspension of unions by Govt.

  4. increase in the selling of cars
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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

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

What are the disadvantages of renewable 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
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

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

  1. Less usage of automobile

  2. controlling population

  3. A,B

  4. Nne
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

Hydrogen is a cleaner fuel than $CNG.$ 

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
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 $CNG.$