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?

Which of the following forces is/are fundamental in nature ? 1. Gravitational force 2. Electromagnetic forces 3. Strong and weak nuclear forces Select the correct answer using the code given below :

Which of the following statements about 'fission' is correct ? 1. It is related with the creation of new individuals by means of cell division in unicellular organism. 2. It is related with the trans…

Consider the interaction forces between two protons separated by a distance of the order of 1 femtometer (10⁻¹⁵ m). The correct order of the strengths of the electromagnetic, gravitational and nuclea…

Consider the following events and arrange them in correct chronological order starting from the earliest to the last activity : (I) Discovery of pi meson (II) Discovery of Neutron (III) Discovery of…

Which of the following pairs of physical phenomenon and the discoverer is/are correctly matched ? 1. James Chadwick : Photoelectric effect 2. Albert Einstein : Neutron 3. Marie Curie : Radium Select…