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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. $24$

Asked in: Physics - Sources of Energy

1 Verified Answer | Published on 07th 09, 2020

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. $\approx 9.0\times 10^{13}J$

Asked in: Physics - Sources of Energy

1 Verified Answer | Published on 07th 09, 2020

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.
$(1 amu=930 MeV/c^2)$

Asked in: Physics - Sources of Energy

1 Verified Answer | Published on 07th 09, 2020

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

Asked in: Physics - Sources of Energy

1 Verified Answer | Published on 07th 09, 2020

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

Asked in: Physics - Sources of Energy

1 Verified Answer | Published on 07th 09, 2020

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. $6.675\ MeV$

Asked in: Physics - Sources of Energy

1 Verified Answer | Published on 07th 09, 2020

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

Asked in: Physics - Sources of Energy

1 Verified Answer | Published on 07th 09, 2020

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. $10^{9}K$

Asked in: Physics - Sources of Energy

1 Verified Answer | Published on 07th 09, 2020

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

Asked in: Physics - Sources of Energy

1 Verified Answer | Published on 07th 09, 2020

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. $2820\times10^{6}$ $J$

Asked in: Physics - Sources of Energy

1 Verified Answer | Published on 07th 09, 2020

Questions 122475
Subjects 10
Chapters 93
Enrolled Students 65