Hello, I want the sample questions of the Kishore Vaigyanik Protsahan Yojana, please provide me.

Hello, here I am providing you the questions of the Kishore Vaigyanik Protsahan Yojana as under:

1 ) If the radius of the 13Al27 nucleus is estimated to be 3.6 fermi, then the radius of 52Te125
nucleus will be nearly
( a ) 8 fermi ( b ) 6 fermi ( c ) 5 fermi ( d ) 4 fermi

2 ) Starting with a sample of pure Cu66, 7 8th of it decays into Zn in 15 min tes. The
corresponding half-life is
( a ) 15 minutes ( b ) 10 minutes ( c ) 7.5 minutes ( d ) 5 minutes

3 ) The diagram shows the energy levels for an electron
in a certain atom. Which transition shown represents
the emission of a photon with the most energy
( a ) IV ( b ) ( c ) ( d )

4 ) A nuclear transformation is denoted by X ( n ) 3Li7
. Which of the following is the
nucleus of element X ?
( a ) 5B10 ( b ) 6C12 ( c ) 4Be11 ( d ) 5B9

5 ) If the kinetic energy of a free elect on doubles, its de-Broglie wavelength changes by the
factor
( a ) 2 ( b ) 1 2 ( c ) √2 ( d ) 1 / √2

6 ) A nucleus disintegrates into two nuclear parts which have their velocities in the ratio
2 : 1. The ratio of their n clea s zes will be
( a ) 3 1 : 2
1
( b ) 2
1
: 1 ( c ) 2 1 : 3
1
( d ) 3
1
2 : 1

7 ) The binding energy p r nucleon of deuteron ( 1H2
) and helium nucleus ( 2He4
) is
1.1 MeV and 7 MeV respectively. If t wo deuteron nuclei reacts to form a single helium
nucleus, hen the energy released is
( a ) 13.9 MeV ( b ) 26.9 MeV ( c ) 23.6 MeV ( d ) 19.2 MeV

8 ) An α particle of energy 5 MeV is scatter ed through 180° by a fixed uranium nucleus.
Th distance of the closest approach is of the order of
( a ) 1 A° ( b ) 10 10 cm ( c ) 10 12 cm ( d ) 10 15 cm

9 ) When U238 nucleus originally at rest, decays by emitting an alpha particle having speed
‘u’, the recoil speed of the residual nucleus is
( a ) 238
4u
- ( b ) 238
4u ( c ) 234
4u
- ( d ) 234
4u

10 ) A nucleus with Z = 92 e mits the following in a sequence α
, + . The Z of the resulting nucleus is
( a ) 74 ( b ) 76 ( c ) 78 ( d ) 82

8th of it decays into Zn in 15 min tes. The
( a ) 15 minutes ( b ) 10 minutes ( c ) 7.5 minutes ( d ) 5 minutes

4 ) A nuclear transformation is denoted by X ( n ) 3Li
( d )

5 ) If the kinetic energy of a free elect on doubles, its de
2 ( c ) √2 ( d ) 1

6 ) A nucleus disintegrates into two nuclear parts which have their velocities in the ratio
2 : 1. The ratio of their n clea s zes will be
( b ) 2
1
: 1

7 ) The binding energy p r nucleon of deuteron (
1.1 MeV and 7 MeV respectively. If t wo deuteron nuclei reacts to form a single helium
nucleus, hen the energy released is
( a ) 13.9 MeV ( b ) 26.9 MeV ( c ) 23.6 MeV ( d ) 19.2 MeV

8 ) An α particle of energy 5 MeV is scatter ed through 180
Th distance of the closest approach is of the order of
( a ) 1 A

9 ) When U
23 - ATOMS, MOLECULES AND NUCLEI Page 2
( Answers at the end of all questions )

11 ) If the radioactive decay constant of radium is 1.07 × 1 0 4
per year, then the half-life
period is approximately equal to
( a ) 8900 yrs. ( b ) 7000 yrs. ( c ) 6500 yrs. ( d ) 5000 years

12 ) Which of the following cannot be emitted by radioactive substances during their decay ?
( a ) electrons ( b ) protons ( c ) neutrinos ( d ) helium nuclei

13 ) Which of the following atoms has the lowest ionization potential ?
( a ) 8O16 ( b ) 7N14 ( c ) 55Cs123 ( d ) 18Ar14

14 ) If the binding energy of the electron in a hydrogen atom is 13 6 eV the energy required
to remove the electron from the first excited state of Li++ is
( a ) 122.4 eV ( b ) 30.6 eV ( c ) 13.6 eV ( d ) 3.4 eV

15 ) The wavelengths involved in the spectrum of deut ium ( 1D2
) are slightly different from
that of hydrogen spectrum, because
( a ) size of the two nuclei are different
( b ) masses of the two nuclei are different
( c ) nuclear forces are different in the two cases
( d ) attraction between the electrons and the uc eus is different in two cases