MCQ
A chain reaction is continuous due to
  • A
    Large mass defect
  • B
    Large energy
  • Production of more neutrons in fission
  • D
    None of these

Answer

Correct option: C.
Production of more neutrons in fission
c
(c) Due to the production of neutrons, a chain of nuclear fission is established which continues until the whole of the source substance is consumed.

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

In an electric motor, wires carrying a current of $5A$ are placed at right angles to a magnetic field of induction $0.8T.$ If each wire has length of $20\ cm$, then the force acting on each wire is:
The threshold wavelength for photoelectric effect of a metal is 6500 Å. The work function of the metal is approximately
The field of view is maximum for
For comparing the e.m.f.'s of two cells with a potentiometer, a standard cell is used to develop a potential gradient along the wires. Which of the following possibilities would make the experiment unsuccessful
The adjoining figure shows two different arrangements in which two square wire frames are placed in a uniform constantly decreasing magnetic field $B.$ The direction of induced current in the case $I$ is
If the length of potentiometer wire is increased, then the length of the previously obtained balance point will:
Assertion : The temperature coefficient of resistance is positive for metals and negative for P-type semiconductor.
Reason : The effective charge carriers in metals are negatively charged whereas in P-type semiconductor they are positively charged.
A right angled prism of refractive index $\mu_1$ is placed in a rectangular block of refractive index $\mu_2$, which is surrounded by a medium of refractive index $\mu_3$, as shown in the figure, A ray of ligth 'e' enters the rectangular block at normal incidence. Depending upon the relationships between $\mu_1, \mu_2$ and $\mu_3$, it takes one of the four possible paths $'ef', 'eg', 'eh'$ or $'ei'$. $Image$

Match the paths in List $I$ with conditions of refractive indices in List $II$ and select the correct answer using the codes given below the lists :

List $I$ List $II$
$P$. $\quad e \rightarrow f$ $1.$ $\quad \mu_1>\sqrt{2} \mu_2$
$Q.$ $\quad e \rightarrow g$ $2.$ $\quad \mu_1>\mu_1$ and $\mu_2>\mu_3$
$R.$ $\quad e \rightarrow h$ $3.$ $\quad \mu_1=\mu_2$
$S.$ $\quad e \rightarrow i$ $4.$ $\quad \mu_2<\mu_1<\sqrt{2} \mu_2$ and $\mu_2>\mu_3$

Codes: $\quad \quad P \quad Q \quad R \quad S $ 

The graph between wave number $(\bar \nu )$ and angular frequency ($\omega$) is
The ${K_\alpha }$ $X-$ ray emission line of tungsten occurs at $\lambda = 0.021\ nm$. The energy difference between $K$ and $L$ levels in this atom is about