1

### IIT-JEE 2002 Screening

Rutherford's experiment, which established the nuclear model of the atom, used a beam of
A
$\beta-particles$, which impinged on a metal foil and got absorbed
B
$\gamma-particles$, which impinged on a metal foil and ejected electrons
C
helium atoms, which impinged on a metal foil and got scattered
D
helium nuclei, which impinged on a metal foil and got scattered
2

### IIT-JEE 2001 Screening

The quantum numbers +1/2 and -1/2 for the electron spin represent
A
rotation of the electron in clockwise and anticlockwise direction respectively
B
rotation of the electron in anticlockwise and clockwise direction respectively
C
magnetic moment of the electron pointing up and down respectively
D
two quantum mechanical spin states which have no classical analogue
3

### IIT-JEE 2001 Screening

The wavelength associated with a golf ball weighing 200 g and moving at speed of 5 m/h is of the order
A
10-10 m
B
10-20 m
C
10-30 m
D
10-40 m
4

### IIT-JEE 2000 Screening

The electronic configuration of an element is 1s2, 2s2 2p6, 3s2 3p6 3d5, 4s1 This represents its
A
excited state
B
ground state
C
cationic form
D
anionic form