Related Questions

Consider the following statements.
1. The chain reaction process is used in nuclear bombs to release a vast amount of energy, but in nuclear reactors, there is no chain reaction.
2. In a nuclear reactor, the reaction is controlled, while in nuclear bombs, the reaction is uncontrolled.
3. In a nuclear reactor, all operating reactors are 'critical', while there is no question of 'critically' in case of a nuclear bomb.
4. Nuclear reactors do not use moderators, while nuclear bombs use them.
Which of the above statements about operational principles of a nuclear reactor and a nuclear bomb is/are correct?
The plot of log A vs time t, where A is activity as shown in the figure, corresponds to decay
Nuclear and Particle Physics mcq question image
In a diatomic molecule, the inter-nuclear separation of the ground and first excited electronic state are the same as shown in the figure. If the molecule is initially in the lowest vibrational state of the ground state, then the absorption spectrum will appear as
Atomic and Molecular Physics mcq question image
Correct answer for the given blank out of the four alternatives.
The main failings were of conception and a political willingness to settle _________ easy options. _______________ the expansive declarationsof the need "to maintain effective security of all nuclear materials, _______________ includes nuclear materials used in nuclear weapons”, thesummits narrowed their _______________ to civilian holdings __________________ non­nuclear weapon states.
_______________ includes nuclear materials used in nuclear weapons”
Read the given information and decide the appropriate course of action. NEET examination has laid the following conditions to qualify for appearance in the NEET Exam. 1. Candidate should pass Grade 12 with a minimum of 50% marks in Biology, Physics and Chemistry group. 2. Candidate should have completed 17 years as on 31-03-2018. 3. Candidate should have opted for Biology, Physics and Chemistry in Grade 12.
Candidate 1 : Ram's date of birth is 14-05-2001, with 40% marks in Mathematics, Physics, Chemistry and Biology. Candidate 2 : Sham's date of birth is 16 - 08 - 2000, with 60% marks in Biology, Physics and Chemistry.
Who is eligible to write the NEET Exam ?
A piston containing an ideal gas is originally in the state X (see figure). The gas is taken through a thermal cycle X → Y → X as shown
Thermodynamics and Statistical Physics mcq question image
The work done by the gas is positive, if the direction of the thermal cycle is
In crystallographic notations, the vector $$\overrightarrow {{\bf{OP}}} $$  in the cubic cell shown in the figure is
Solid State Physics mcq question image
Five energy levels of a system including the ground state are shown below. Their lifetimes and the allowed electric dipole transitions are also marked.
Atomic and Molecular Physics mcq question image
Which one of the following transitions is the most suitable for a Continuous Wave (CW) laser?
The temperature dependence of the electrical conductivity σ of two intrinsic semiconductors A and B is shown in the figure. If EA and EB are the band gaps of A and B respectively, which one of the following is true?
Solid State Physics mcq question image
Variation of electrical resistivity $$\rho $$ with temperature T of three solids is sketched (on different scales) in the figure, as curves P, Q and R.
Which one of the following statements describes the variations most appropriately?
Solid State Physics mcq question image