The rate of disintegration of a fixed quantity of a radioactive substance can be increased by:

1. increasing the temperature.

2. increasing the pressure.

3. chemical reaction.

4. it is not possible.

Subtopic:  Radioactivity (OLD NCERT) |
 53%
From NCERT
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The energy released by the fission of one  uranium atom is 200 MeV. The number of fission per second required to produce 3.2 W of power is (Take, 1 eV = 1.6×10-19 J) [WB JEE 2010]

1. 107 

2. 1010 

3. 1015

4. 1011

Subtopic:  Nuclear Binding Energy |
 70%
From NCERT
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The power obtained in a reactor using \(\mathrm{U}^{235}\) disintegration is \(1000\) kW. The mass decay of \(\mathrm{U}^{235}\) per hour is:
1. \(1\) microgram
2. \(10\) microgram
3. \(20\) microgram
4. \(40\) microgram

Subtopic:  Nuclear Energy |
From NCERT
PMT - 2011
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Light energy emitted by stars is due to

1. Breaking of nuclei 

2.Joining of nuclei       

3. Burning of nuclei

4. Reflection of solar light

Subtopic:  Mass-Energy Equivalent |
 61%
From NCERT
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The constituents of atomic nuclei are believed to be [1991]

1. neutrons and protons

2. protons only

3. electrons and protons

4. electrons, protons and neutrons

Subtopic:  Mass-Energy Equivalent |
 79%
From NCERT
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The half-life of radium is about 1600 yr. Of 100 g of radium existing now, 25 g will remain unchanged after [2004]

1. 4800 yr

2. 6400 yr 

3. 2400 yr

4. 3200 yr

Subtopic:  Radioactivity (OLD NCERT) |
 78%
From NCERT
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Half-life of a radioactive substance is 12.5 h and its mass is 256 g. After what time, the amount of remaining substance is 1 g? [2001]

1. 75 h

2. 100 h 

3. 125 h

4. 150 h

Subtopic:  Radioactivity (OLD NCERT) |
 86%
From NCERT
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A radioactive substance disintegrates 1/64 of initial value in 60 s. The half-life of this substance is

1. 5 s 

2. 10 s

3. 30 s 

4. 20 s

Subtopic:  Radioactivity (OLD NCERT) |
 87%
From NCERT
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The nucleus C612 absorbs an energetic neutron and emits a beta particle β-. The resulting nucleus is 

1. C714

2. N713 

3. B513 

4. C613

Subtopic:  Types of Decay |
 69%
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If in a nuclear fusion  process, the masses of the fusion nuclei be m1 and m2 and the mass of the resultant nucleus be m3, then [2004]

1. m3=m1+m2

2. m3=m1-m2

3. m3<m1+m2 

4. m3>m1+m2

Subtopic:  Mass-Energy Equivalent |
 81%
From NCERT
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