Geiger counter is suitable for _________________?

A. Fast counting
B. Extremely fast counting
C. Slow counting
D. All situations

An alpha particle can produce fluorescence in__________________?

A. Zns
B. Barium platinocyanide
C. Calcium tungstate
D. All of above

Pair production cannot take place in a vacuum as ________ is not conserved ?

A. Energy
B. Charge
C. Mass
D. Momentumb.

CFC is used in _________________?

A. Refrigeration
B. Aerosol spray
C. Plastic foam industry
D. All of above

Average distance covered by alpha particles in the air before its ionizing power ceases is called its_________________?

A. Trajectory
B. Range
C. Firing level
D. Limit

Which one of the following possesses greater penetration power ?

A. Α-rays
B. Β-rays
C. Γ-rays
D. Neutron-rays

The most useful tracer is_________________?

A. Sr-90
B. I-131
C. Ca-41
D. C-14

X-rays are electromagnetic waves like________________?

A. Light waves
B. Heat waves
C. Microwaves
D. Γ-rays

The charge on beta particle is________________?

A. 1
B. -1
C. +2
D. -2

Why gamma rays are used to kill bacteria to sterilize surgical equipment etc ?

A. Chargeless
B. MaSSLess
C. Highly penetrating
D. All of above