NTSE SAT Physics Nuclear Fission and Fusion MCQs

Question: Which of the following is used to absorb the neutrons in a nuclear reactor ?

• a) Moderator
• b) Coolant
• c) Boron rod
• d) Graphite

Answer: Boron rod

Question: Which of the following cannot be used to produce electricity ?

• a) Nuclear fission
• b) Hydro energy
• c) Geothermal energy
• d) Nuclear fusion

Answer: Nuclear fusion

Question: The place where nuclear power plant is not situated is :

• a) Narora
• b) Tarapur
• c) Kota
• d) Bhopal

Answer: Bhopal

Question: The number of neutrons in an atom X of atomic number Z and mass number A is :

• a) Zero
• b) Z
• c) A - Z
• d) A

Answer: A - Z

Question: When a beta particle is given out, the atomic number of the parent atom :

• a) Increases by unity
• b) Decreases by unity
• c) Remains the same
• d) Is halved

Answer: Increases by unity

Question: The radioactive isotope of phosphorus ₁₅P³⁰ changes to stable ₁₄Si³⁰ through :       

• a) Alpha emission
• b) Beta emission
• c) Neutron emission
• d) Positron emission

Answer: Positron emission

Question: The main difference between nuclear reactor and atom bomb is :

• a) Is nuclear reactor an uncontrolled chain reaction of nuclear fission takes place, while in atom bomb controlled chain reaction takes place.
• b) In nuclear reactor, a controlled chain reaction of nuclear fission takes place, while in atom bomb uncontrolled chain reaction takes place.
• c) In nuclear reactor, nuclear fusion takes place, while in atom bomb nuclear fission takes place
• d) None of these

Answer: In nuclear reactor, a controlled chain reaction of nuclear fission takes place, while in atom bomb uncontrolled chain reaction takes place.

Question: Which of the following isotope of uranium is unstable ?

• a) U - 235
• b) U - 234
• c) U -238
• d) All the above

Answer: All the above

Question: Which of the following has least penetrating power ?

• a) Alpha particles
• b) Gamma rays
• c) Beta particles
• d) All have ht same penetrating power

Answer: Alpha particles

Question: Control rods used in a nuclear reactor are made of :

• a) Zinc
• b) Platinum
• c) Cadmium
• d) Lead

Answer: Cadmium

More Questions..................

Question: In radioactive decay  the number of  α and  β- particles emitted respectively are -       

• a) 1, 2
• b) 2, 0
• c) 0, 2
• d) 2, 1

Answer: 0, 2

Question: In the nuclear reaction - 

The missing particle is -

• a)

  

• b)

  

• c)

  

• d) γ

Answer:

Question: An example of nuclear fusion reaction is -

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: The energy released during nuclear fusion and nuclear fusion reaction is due to :

• a) Chemical reaction
• b) The conversion of electrical energy
• c) The conversion of gravitational energy
• d) The conversion of mass into energy

Answer: The conversion of mass into energy

Question: In a nuclear fission the nucleus of an element splits into two nuclei. The fission products have____than that of parent atom :

• a) The higher atomic number
• b) The lower atomic number
• c) The same atomic number
• d) The same mass number

Answer: The lower atomic number

Question: Radioactivity was discovered by :

• a) Rutherford
• b) Becquerel
• c) N. Bohr
• d) Madame Curie

Answer: Becquerel

Question: How many electrons are present in Na+ ?    

• a) 11
• b) 12
• c) 10
• d) 1

Answer: 10

Question: The ratio of the volume of an atom and the volume of its nucleus is :

• a) 105 : 1
• b) 10¹⁰ : 1 
• c) 10¹⁵ : 1 
• d) 10²⁰ : 1

Answer: 10¹⁵ : 1 

Question: 48 kJ of energy of produced in 60 s in a nuclear reactor. The number of fission which taking place per second will be (if the energy released per fission is 3.2 × 10^-11) :

• a) 25 × 10¹² 
• b) 50 × 10¹² 
• c) 182 × 10^-11
• d) 182 × 10¹¹

Answer: 25 × 10¹² 

Question: Which of the following isotope of uranium is unstable ?

• a) U - 235
• b) U - 234
• c) U -238
• d) All the above

Answer: All the above