PHYSICS CHAPTER 21
- The charge on proton is :
a. 1.67 x 10^-27C
b. 1.6 x 10^-19C
c. 1.6 x 10^19C
d. 1.673 x 10^-27C
Right answer = C
- The background radiation to which we are exposed on the average is ____ per year ?
a. 2 Sv
b. 4 Sv
c. 2 mSv
d. 2 mrem
Right answer = C
- Doses of ___ will cause radiation burns to the skin :
a. 3 Sv
b. 2 Sv
c. 2 mSv
d. 3 mSv
Right answer = A
- For Sun, The temperature of its core is about _____ degree centigrade and its surface temperature is about ____ degree centigrade :
a. 10 million, 5 million
b. 20 million, 5 million
c. 5 million , 6000
d. 20 million , 6000
Right answer = D
- Which of the following don't experience strong nuclear force :
a. hadrons
b. proton
c. baryons
d. leptons
Right answer = D
- Half life of U-238 is :
a. 4.5 x 10^6 years
b. 4.5 x 10^8 years
c. 4.5 x 10^9 years
d. 4.5 x 10^4 years
Right answer = C
- Isotopes of Hydrogen are :
a. 1
b. 2
c. 3
d. 4
Right answer = C
- Neutron is Discovered by :
a. Chadwick
b. Rutherford
c. Bohr
d. Einstein
Right answer = A
- Atomic Bomb is an example of :
a. Fission process
b. Fusion process
c. nuclear reactor
d. chemical process
Right answer = A
- For Some of the absorbed dose a-particles are ___ times more damaging than X-rays :
a. 2
b. 5
c. 10
d. 20
Right answer = D
- Unit of Radioactivity ' curie ' is equal to :
a. 3.40 x 10^9 disintegration/second
b. 3.70 x 10^10 disintegration/second
c. 3.55 x 10^10 disintegration/second
d. 7.30 x 10^10 disintegration/second
Right answer = B
- When Nucleus emits an alpha particle its mass number drops by :
a. 1
b. 2
c. 4
d. 8
Right answer = C
- Which of the following is Best shield against gamma rays ?
a. concrete
b. heavy water
c. ordinary water
d. Lead
Right answer = D
- 1 amu is equal to = ?
a. 1.02 MeV
b. 931 eV
c. 931 MeV
d. 13.6 eV
Right answer = C
- If Energy of electromagnetic nuclear reactions is less than 0.51 MeV then the dominant process is :
a. pair production
b. compton's effect
c. Photoelectric effect
d. Both b and c
Right answer = C
- What %age of Original radioactive atoms left after five half lives :
a. 3%
b. 5%
c. 10%
d. 20%
Right answer = A
- in fast reactor , the type of uranium used is :
a. U 235
b. U 238
c. U 234
d. U 239
Right answer = B
- Energy liberated when one atom of U -235 undergoes fission reaction is about :
a. 200 MeV
b. 200 eV
c. 300 MeV
d. 300 eV
Right answer = A
- Strontium 90 is used as :
a. beta particle source
b. alpha particle source
c. gamma rays source
d. neutron source
Right answer = A
- Binding energy per nucleon is maximum for ?
a. cadmium
b. iron
c. uranium
d. lead
Right answer = B
- Most abundant isotope of neon is :
a. Neon - 20
b. Neon - 21
c. Neon - 22
d. Neon - 23
Right answer = A
- Those Elements whose charge number Z is greater than ___ are unstable :
A. 79
B. 80
C. 90
D. 82
Right answer = D
- The Radioactive Decay constant has the same dimensions as that of :
a. Frequency
b. Time
c. Planck's constant
d. angular momentum
Right answer = A
- Dead time of GM counter is in the order of :
a. 10^4 sec
b. 10^-4 sec
c. 10^-8 sec
d. 10^-6 sec
Right answer = B
- An alpha particle falls through a potential difference of 50 volts. Energy acquired by it will be :
a. 25 eV
b. 50 eV
c. 100 eV
d. 200 eV
Right answer = C
- Total Number of Protons in the Nucleus is called as :
a. Atomic number
b. Mass number
c. electronic number
d. Protonic number
Right answer = A
- Building blocks of protons and neutrons are called as :
a. quarks
b. baryons
c. hadrons
d. mesons
Right answer = A
- Neutron and Protons are commonly called :
a. graviton
b. deutrons
c. mesons
d. nucleons
Right answer = D
- An alpha particle ionizes a molecule or atom through :
a. direct collision
b. electrostatic attraction
c. electrostatic repulsion
d. none of these
Right answer = B
- One amu is equal to :
a. 3.32 x 10^-24 kg
b. 1.66 x 10^-24 kg
c. 1.67 x 10^-27 kg
d. 1.6606 x 10^-27 kg
Right answer = D
a. 1.67 x 10^-27C
b. 1.6 x 10^-19C
c. 1.6 x 10^19C
d. 1.673 x 10^-27C
Right answer = C
a. 2 Sv
b. 4 Sv
c. 2 mSv
d. 2 mrem
Right answer = C
a. 3 Sv
b. 2 Sv
c. 2 mSv
d. 3 mSv
Right answer = A
a. 10 million, 5 million
b. 20 million, 5 million
c. 5 million , 6000
d. 20 million , 6000
Right answer = D
a. hadrons
b. proton
c. baryons
d. leptons
Right answer = D
a. 4.5 x 10^6 years
b. 4.5 x 10^8 years
c. 4.5 x 10^9 years
d. 4.5 x 10^4 years
Right answer = C
a. 1
b. 2
c. 3
d. 4
Right answer = C
a. Chadwick
b. Rutherford
c. Bohr
d. Einstein
Right answer = A
a. Fission process
b. Fusion process
c. nuclear reactor
d. chemical process
Right answer = A
a. 2
b. 5
c. 10
d. 20
Right answer = D
a. 3.40 x 10^9 disintegration/second
b. 3.70 x 10^10 disintegration/second
c. 3.55 x 10^10 disintegration/second
d. 7.30 x 10^10 disintegration/second
Right answer = B
a. 1
b. 2
c. 4
d. 8
Right answer = C
a. concrete
b. heavy water
c. ordinary water
d. Lead
Right answer = D
a. 1.02 MeV
b. 931 eV
c. 931 MeV
d. 13.6 eV
Right answer = C
a. pair production
b. compton's effect
c. Photoelectric effect
d. Both b and c
Right answer = C
a. 3%
b. 5%
c. 10%
d. 20%
Right answer = A
a. U 235
b. U 238
c. U 234
d. U 239
Right answer = B
a. 200 MeV
b. 200 eV
c. 300 MeV
d. 300 eV
Right answer = A
a. beta particle source
b. alpha particle source
c. gamma rays source
d. neutron source
Right answer = A
a. cadmium
b. iron
c. uranium
d. lead
Right answer = B
a. Neon - 20
b. Neon - 21
c. Neon - 22
d. Neon - 23
Right answer = A
A. 79
B. 80
C. 90
D. 82
Right answer = D
a. Frequency
b. Time
c. Planck's constant
d. angular momentum
Right answer = A
a. 10^4 sec
b. 10^-4 sec
c. 10^-8 sec
d. 10^-6 sec
Right answer = B
a. 25 eV
b. 50 eV
c. 100 eV
d. 200 eV
Right answer = C
a. Atomic number
b. Mass number
c. electronic number
d. Protonic number
Right answer = A
a. quarks
b. baryons
c. hadrons
d. mesons
Right answer = A
a. graviton
b. deutrons
c. mesons
d. nucleons
Right answer = D
a. direct collision
b. electrostatic attraction
c. electrostatic repulsion
d. none of these
Right answer = B
a. 3.32 x 10^-24 kg
b. 1.66 x 10^-24 kg
c. 1.67 x 10^-27 kg
d. 1.6606 x 10^-27 kg
Right answer = D
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