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Sources of Energy

10th Class - CBSE - Physics - 981 Questions - 0 Concepts

Important Questions

Q1 Single Correct Hard
Consider the following reaction $$^1H_2+^1H_2\rightarrow  _2He^4+Q$$
If $$m(_1H^2)=2.0141 u, m(_2He^4)=4.0024 u$$, then the energy Q released (in MeV) in this fusion reaction is
  • A. $$12$$
  • B. $$6$$
  • C. $$48$$
  • D. $$24$$

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Q2 Single Correct Hard
In the fusion reaction $$_1^2He+_1^2H\rightarrow _2^3He+_0^1n$$, the masses of deuteron, helium, and neutron expressed in amu are $$2.015, 3.017$$ and $$1.009$$, respectively. If $$1 kg$$ of deuterium undergoes complete fusion, find the amount of total energy released. $$(1 amu=931.5 meV/c^2)$$
  • A. $$\approx 6.02\times 10^{13}J$$
  • B. $$\approx 5.6\times 10^{13}J$$
  • C. $$\approx 0.9\times 10^{13}J$$
  • D. $$\approx 9.0\times 10^{13}J$$

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Q3 Subjective Hard
Consider a nuclear reaction $$A+B\rightarrow C$$. A nucleus A moving with kinetic energy of 5 MeV collides with a nucleus B moving with kinetic energy of 3 MeV and forms a nucleus C is excited state. Find the kinetic energy of nucleus C just after its formation if it is formed in a state with excitation energy 10 MeV. Take masses of nuclei of A, B, and C as 25.0, 10.0, 34.995 amu, respectively.
$$(1 amu=930 MeV/c^2)$$

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Q4 Single Correct Medium
The fusion process is possible at high temperature because at high temperatures 
  • A. the nucleus disintegrates
  • B. molecules disintegrate
  • C. atoms become ionised
  • D. the nuclei get sufficient energy so as to overcome the Coulomb repulsive force

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Q5 Single Correct Medium
The nuclear fusion reaction between deuterium and tritium takes place
  • A. at ordinary temperature and pressure
  • B. at low temperature and low pressure
  • C. when the temperature is near absolute zero
  • D. at very high temperature and very high pressure

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Q6 Single Correct Medium
A certain mass of Hydrogen is changed to Helium by the process of fusion. The mass defect in fusion reaction is $$0.02866\ u$$. The energy liberated per $$u$$ is (given $$1\ u=931\ MeV$$)
  • A. $$2.67\ MeV$$
  • B. $$26.7\ MeV$$
  • C. $$13.35\ MeV$$
  • D. $$6.675\ MeV$$

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Q7 Single Correct Medium
The temperature necessary for fusion reaction is 
  • A. $$3\times10^{3}$$
  • B. $$3\times10^{2}$$
  • C. $$3\times10^{4}$$
  • D. $$3\times10^{6}$$

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Q8 Single Correct Medium
In the nuclear fusion reaction : $$^{2}_{1}H+ ^{3}_{1}H \rightarrow $$ $$^{4}_{2}He+n $$ , given that the repulsive potential energy between the two nuclei is $$\sim 7.7 \times 10^{-14}$$J, the temperature to which the gases must be heated to initiate the reaction is nearly 
(Boltzmann's constant $$k=$$1.38 x 10$$^{-23}$$J)
  • A. $$10^{7} K$$
  • B. $$10^{5} K$$
  • C. $$10^{3} K$$
  • D. $$10^{9}K$$

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Q9 Single Correct Medium
The necessary condition for nuclear fusion is 
  • A. low temperature and low pressure
  • B. high temperature and low pressure
  • C. low temperature and high pressure
  • D. high temperature and high pressure

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Q10 Single Correct Medium
Calculate the energy which can be obtained from $$1$$ kg of $$H_{2}O$$ through the fusion reaction
$$_{1}^{2}\textrm{H}$$ +$$_{1}^{2}\textrm{H}$$ $$\rightarrow$$ $$_{1}^{3}\textrm{H}$$ + $$p$$.
Assume $$ 1.5 \times 10^{2} %$$ of the water contains deuterium. The whole deuterium is consumed in the fusion reaction 
  • A. $$2820$$ $$J$$
  • B. $$2820\times10^{4}$$ $$J$$
  • C. $$2820\times10^{-4}$$ $$J$$
  • D. $$2820\times10^{6}$$ $$J$$

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