A. Greater than the critical size
B. Less than the critical size
C. Equal to the critical size
D. All of above can build up a change reaction
Related Mcqs:
- If one or more of the neutrons emitted during fission cab be used to build up further fission then the reaction is self-sustained and is known as __________________?
A. Fission reaction
B. Fusion reaction
C. Chain reaction
D. Chemical reaction - The fission chain reaction in a nuclear reactor can be controlled by introducing _______________?
A. Iron rods
B. Graphite rods
C. Cadmium rods
D. Platinum rods - Radioactive decay obeys which one of the following law ?
A. N=Noe-λt
B. N=Noeλt
C. N=Noe-λt/2
D. No=N(1+eλt) - Radioactive materials can be identified by measuring their_______________?
A. Hardness
B. Density
C. Mass
D. Half life - An electric iron is marked 20 volts 500W. The units consumed by it in using if for 24 hours will be______________?
A. 12
B. 24
C. 5
D. 1100 - A body of 2 kg is suspended from the ceiling of an elevator moving up with an acceleration g. Its apparent weight in the elevator will be______________?
A. 9.8 N
B. 19.6 N
C. 129.4 N
D. 39.2 N - The minimum wavelength of X-rays produced by the bombardment of electrons on the screen of a television set where the accelerating potential is 2.0K V will be______________?
A. 6.2 x 10-10m
B. 9.1 x 10-18m
C. 3.11 x 10-10m
D. 4 x 10-10m - In normal state of energy the incident high energy photons will be______________?
A. Stimulated
B. Absorbed
C. Cause X-ray emission
D. Cause laser production - Which one of the following is not a radioactive element ?
A. Cadmium
B. Thorium
C. Radium
D. UraniumSubmitted by: Mansoor Ahmed Suhag
- Quality of X-rays depends upon ____________ A-filament current B-accelerating voltage C-material of the target ?
A. A & B
B. B & C
C. A & C
D. A B & C
