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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 ‘criticality’ 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?
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
The 2018 Nobel Prize in Physics has been awarded in laser physics for the optical tweezers and their applications to biological systems for the method of generating high-intensity, ultra-short optical pulses. Which of the following verifies the given statement? I:  The 2018 Nobel Prize in Physics has been awarded in laser physics for the optical tweezers. II: The 2018 Nobel Prize in Physics has been awarded for applications of the optical tweezers to biological systems. III: The 2018 Nobel Prize in Physics has been awarded for the method of generating high-intensity, ultra-short optical pulses using the optical tweezers.
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
The criteria for selecting a Physics Teacher have been given as under:  The candidate must:  1. Have a masters degree in Physics with at least 60 percent marks. 2. Be a graduate in Physics with atleast 65 percent marks. 3. Be between 25 and 35 years old as on 01/01/2020. 4. Should have work experience of atleast 5 years. The following exceptions apply: A. If a candidate meets all other criteria except 4 above, the candidate will be referred to the Principal. B. A candidate whose age is more than 35 years but less than 40 years will be referred to the Vice Principal. Ritika has done her masters from XYZ University in Physics. She topped her batch with 80 percent marks. She did her B.Sc in Physics from ABC College. She is 39 years old. She has been teaching in MNO School for last 7 years. What decision should be taken about this candidate? 
A junior college inducts students based on the following criteria — 1. Students who scored above 75% in Physics, 85% in Mathematics and 70% in Chemistry. 2. Students who scored at least 60% in English. 3. Students who are good in a sport or play a musical instrument or know a dance form. Which student among the following will the college definitely take? A. Shakti with 80% in Physics, 65% in Chemistry, 85% in Mathematics, 61% in English and plays veena. B. Megha secured 80% in Physics, 87% in Mathematics, 70% in English, 75% in Chemistry and is a singer. C. Sheela secured 78% in Physics, 71% in Chemistry, 87% in Mathematics, 75% in English knows Manipuri folk dance. D. Mallika secured 70% in Chemistry, 70% in Mathematics, 85% in Physics, 65% in English and plays basketball.
A question is followed by 2 statements. Study the following statements carefully and state whether they are sufficient to answer the question. A student appears in an examination where his marks in biology is 20 marks more than what he got in Physics. Find his marks in biology? Statement I – Average marks of Physics and Chemistry is 71.5. The ratio of marks of Practical and Theory in Physics is 6 ∶ 5 and in chemistry, it is 15 ∶ 7. Statement II –Ratio of marks obtained in the theory exam of physics and chemistry is 1 ∶ 2. The ratio of marks of Physics and Chemistry is 5 ∶ 8.
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”
In a survey of 25 students, it was found that 15 had taken Mathematics, 12 had taken Physics and 11 had taken Chemistry, 5 had taken Mathematics and Chemistry, 9 had taken Mathematics and Physics, 4 had taken Physics and Chemistry and 3 had taken all the three subjects. Find the number of students who had taken both Physics and Chemistry but not Mathematics.