Chemistry - Questions and AnswersPage 48
471. | | In an atomic explosion, enormous energy is released which is due to the | | (a)Conversion of neutrons into protons | | (b)Conversion of chemical energy into heat energy | | (c)Conversion of chemical energy into nuclear energy | | (d)Conversion of mass into energy |
|
Answer is: D
472. | What is the correct ascending order for frequencies of the following radiations?
1. Visible
2. X-rays
3. Ultraviolet
4. Radiowaves | | (a)1, 3, 2, 4 | | (b)3, 2, 4, 1 | | (c)4, 1, 3, 2 | | (d)4, 3, 1, 2 |
|
Answer is: C
473. | | Which substance is used as a Moderator in Nuclear Reactor? | | (a)Graphite | | (b)Sodium | | (c)Nitrogen | | (d)Silican |
|
Answer is: AHeavy water is also used as a moderator in Nuclear Reactor.
474. | | In spontaneous beta particle emission what is the source of emitted electron? | | (a)The nucleus | | (b)The1s-orbital | | (c)The outermost occupied orbital | | (d)A random orbital |
|
Answer is: A
475. | Consider the following statements X-rays
1. Can pass through aluminium.
2. Can be deflected by magnetic field.
3. Move with a velocity less than the velocity of ultraviolet rays in vacuum.
Which of the statement given above is/are correct? | | (a)1, 2 and 3 | | (b)Only 1 | | (c)2 and 3 | | (d)1 and 4 |
|
Answer is: C
476. | | The Alpha-Particle carries two positive charges. Its mass is very nearly equal to that of | | (a)Two protons | | (b)An atom of helium | | (c)Sum of masses of two positrons and two neutrons | | (d)Two positions as each positron carries a single positive charge |
|
Answer is: B
477. | Study the following statements.
1. Successive emission of one alpha and two beta particles results in the formation of isotopes.
2. Gamma rays are not affected in magnetic of electric filed.
3. Gamma rays have least penetrating power.
4. Nuclear fusion chain initiation is endothermic but further reaction is exothermic.
Which of the below is/are true? | | (a)Only 1 | | (b)1 and 2 | | (c)3 and 4 | | (d)All of above |
|
Answer is: B
478. | | The difference between a nuclear rector and atomic bomb is that | | (a)No chain reaction takes place in nuclear reactor is not controlled. | | (b)The chain reaction in nuclear reactor is controlled. | | (c)The chain reaction in nuclear reactor in not controlled. | | (d)No-chain reaction takes place in atomic bomb while it takes place in nuclear reactor. |
|
Answer is: B
479. | | In which categories did Marie Curie win her two different Nobel prizes? | | (a)Physics and Chemistry | | (b)Biology and Physics | | (c)Chemistry and Biology | | (d)Chemistry and Peace |
|
Answer is: A
480. | | Enriched uranium means | | (a)Uranium with high concentration of U-233 | | (b)Uranium with high concentration of U-235 | | (c)Uranium with high concentration of U-238 | | (d)Uranium exposed to neutron radiation |
|
Answer is: B
Comments