MCQ
Which of these is a fusion reaction
  • ${ }_3^1 \mathrm{H}+{ }_2^1 \mathrm{H}={ }_4^2 \mathrm{He}+{ }_1^0 \mathrm{n}$
  • B
    ${ }^{238} \mathrm{U} \rightarrow{ }_{82}^{206} \mathrm{~Pb}+8\left({ }_2^4 \mathrm{He}\right)_{+6}\left({ }_{-1}^0 \beta\right)$
  • C
    ${ }_7^{12} \mathrm{C} \rightarrow{ }_6^{12} \mathrm{C}+\beta^{+}+\gamma$
  • D
    None of these

Answer

Correct option: A.
${ }_3^1 \mathrm{H}+{ }_2^1 \mathrm{H}={ }_4^2 \mathrm{He}+{ }_1^0 \mathrm{n}$
${ }_3^1 \mathrm{H}+{ }_2^1 \mathrm{H}={ }_4^2 \mathrm{He}+{ }_1^0 \mathrm{n}$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Magnetic field intensity is defined as(a) Magnetic moment per unit volume(b) Magnetic induction force acting on a unit magnetic pole(c) Number of lines of force crossing per unit area(d) Number of lines of force crossing per unit volume
 
 
 
 
In the absence of an electric field, the mean velocity of free electrons in a conductor at absolute temperature (T) is:
The resistance of a metal wire increases with increasing temperature on account of:
A coil carrying electric current is placed in uniform magnetic field, then(a) Torque is formed(b) E.M.f. is induced(c) Both (a) and (b) are correct(d) None of these
   
   
The sensitivity of a potentiometer can be increased by:
  • increasing the series resistance in the primary circuit.
  • decreasing the length of the potentiometer wire.
  • using a thin and high resistivity wire as a potentiometer wire.
  • increasing the length of the wire.
The drift velocity does not depend upon(a) Cross-section of the wire(b) Length of the wire(c) Number of free electrons(d) Magnitude of the current
   
   
The attenuation in optical fibre is mainly due to(a) Absorption(b) Scattering(c) Neither absorption nor scattering(d) Both (a) and (b)
   
   
Assertion  :   The specific charge of positive rays is not constant.
Reason      : The mass of ions varies with speed.(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.(c) If assertion is true but reason is false.(d) If the assertion and reason both are false.
 
 
 
 
According to Coulomb’s law, the coulomb force measured between two point charges is inversely proportional to:
In the ideal double$-$slit experiment, when a glass$-$plate $($refractive index $1.5)$ of thickness $t$ is introduced in the path of one of the interfering beams $($wavelength $l),$ the intensity at the position where the central maximum occurred previously remains unchanged. The minimum thickness of the glass$-$plate is