571. The penetration power of alpha particle as compared to beta particle is_______________?
A. 10 times more
B. 100 times more
C. 100 times less
D. 10 times less

572. Geiger counter is suitable for _________________?
A. Fast counting
B. Extremely fast counting
C. Slow counting
D. All situations

573. An alpha particle can produce fluorescence in__________________?
A. ZnS
B. Barium platinocyanide
C. Calcium tungstate
D. All of above

574. CFC is used in _________________?
A. Refrigeration
B. Aerosol spray
C. Plastic foam industry
D. All of above

575. 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

576. Which one of the following possesses greater penetration power ?
A. α-rays
B. β-rays
C. γ-rays
D. Neutron-rays

577. The most useful tracer is_________________?
A. Sr-90
B. I-131
C. CA-41
D. C-14

578. X-rays are electromagnetic waves like________________?
A. Light waves
B. Heat waves
C. Microwaves
D. γ-rays

579. The charge on beta particle is________________?
A. 1
B. -1
C. +2
D. -2