1

### IIT-JEE 1996

The orbital angular momentum of an electron in 2s orbital is
A
$+ {1 \over 2}.{h \over {2\pi }}$
B
Zero
C
${h \over {2\pi }}$
D
$\sqrt 2 .{h \over {2\pi }}$
2

### IIT-JEE 1995 Screening

A 3p orbital has
A
two non spherical nodes
B
two spherical nodes
C
one spherical and one non spherical node
D
one spherical and two non spherical nodes
3

### IIT-JEE 1992

Which of the following does not characterise X-rays?
A
B
It causes ZnS to fluorescence
C
Deflected by electric and magnetic fields
D
Have wavelengths shorter than ultraviolet rays
4

### IIT-JEE 1992

Which of the following relates to photons both as wave motion and as a stream of particles?
A
Inference
B
E = mc2
C
Diffraction
D
E = hv