A nuclear decay is expressed as 

${}_{6}C_{11}\to {}_{5}B_{11}+{\beta }^{+}+X$

Then the unknown particle X is:

1. Neutron 

2. antineutrino

3. proton 

4. neutrino

When a deuterium is bombarded on ${}_{8}O_{16}$ nucleus, an $\alpha$-particle is emitted, then the product nucleus is:

1. ${}_{7}N_{13}$ 

2. ${}_{5}B_{10}$

3. ${}_{4}B{e}_9$ 

4. ${}_{7}N_{14}$

A nuclear reaction given by \({ }_{Z}^{A} \mathrm{~X} \rightarrow{ }_{Z+1}^{A} \mathrm{Y}+e^{-}+\bar{v}\) represents:
1. fusion
2. fission
3. \(\beta^{-} \)-decay
4. \(\gamma \)-decay

The mass of ${}_{7}N_{15}$ is 15.00011 amu, mass of ${}_{8}O_{16}$ is 15.99492 amu and $m_p$= 1.00783 amu. Determine the binding energy of the last proton of \({ }_8 O_{16}\).

1. 2.13 MeV

2. 0.13 MeV 

3. 10 MeV 

4. 12.13 MeV

The minimum wavelength of X-rays produced by electrons accelerated by a potential difference of V volt is equal to 

1. $\frac{eV}{hc}$ 

2. $\frac{eh}{cV}$ 

3. $\frac{hc}{eV}$ 

4. $\frac{cV}{eh}$

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.

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$\times$${10}^{-19} J$) [WB JEE 2010]

1. ${10}^7$ 

2. ${10}^{10}$ 

3. ${10}^{15}$

4. ${10}^{11}$

The power obtained in a reactor using $U^{235}$ disintegration is 1000 kW. The mass decay of \(U^{235}\) per hour is:

1. 1 microgram           

2. 10 microgram       

3. 20 microgram     

4. 40 microgram

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

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