Q51. The substance used as both moderator and refrigerant in nuclear reactors is –
- Afresh water
- Bheavy water
- Cliquid ammonia
- Dliquid hydrogen
Show answer & explanation
Answer: B) heavy water
Radioactivity
57 MCQ questions with answers and explanations · page 3 of 3
Q52. Radioactivity is measured by-
- AGeiger-Muller counter
- BPolarimeter
- CCalorimeter
- Dbarometer
Show answer & explanation
Answer: A) Geiger-Muller counter
Q53. On what principle does the 'hydrogen bomb' work?
- Acontrolled fission reaction
- Buncontrolled fission reaction
- Ccontrolled fusion reaction
- Duncontrolled fusion reaction
Show answer & explanation
Answer: D) uncontrolled fusion reaction
Q54. The 'Hydrogen Bomb' was developed by-
- Aby Edward Taylor
- Bby Bernarr Bon Braun
- Cby J. Robert Oppenheimer
- Dby Samuel Cohen
Show answer & explanation
Answer: A) by Edward Taylor
Q55. What is used to determine the age of very ancient rocks?
- Acarbon dating
- BRadio Iron Dating
- CUranium dating
- DPotassium Argon Dating
Show answer & explanation
Answer: D) Potassium Argon Dating
Q56. Which of the following radioelements is used to measure the speed of blood flow in the human body?
- Aradio-phosphorus
- Bradioiodine
- CRadio-iron
- DRadio-sodium
Show answer & explanation
Answer: D) Radio-sodium
Q57. In what order are the penetrating powers of α, β and γ in their descending order
- Aα, β, γ
- Bγ, β, α
- Cβ, α, γ
- Dγ, α, β
Show answer & explanation
Answer: B) γ, β, α