Which of the following statements on the use of X-rays is incorrect? X-rays are used
in hospitals to obtain photogaphs of tissues and bones in the body
for the treatment of malignant growths like cancer cells
in detecting fingerprints
to reveal hidden flaws in metal castings and welded joints
to detect alternations which have been made to works of art
Correct answer is C
-The radiography of cultural objects is the use of radiography to understand intrinsic details about objects. Most commonly this involves X-rays of paintings to reveal underdrawing, pentimenti alterations in the course of painting or by later restorers, and sometimes previous paintings on the support.
-Hard X-rays are used for destroying cancerous cells
-Soft X-rays are used in medicine to photograph human parts
-. In the present work, the spatial elemental imaging capabilities of micro-X-ray fluorescence (MXRF) were used to visualize fingerprint patterns based on inorganic elements present in the prints.
However; Cobalt-60 is widely used in industrial radiography for the rapid checking of faults in wields and castings.
magnetization
paramagnetism
diamagnetism
demagnetization
ferromagnetism
Correct answer is C
If diamagnetic substances are placed in a non-uniform magnetic field, then the substances move towards the weaker side of the field from the stronger side.
When a rod of diamagnetic substance is suspended in a uniform magnetic field, it comes to rest with its length perpendicular to the directions of the field
wave length
wave crest
wave trough
wave amplitude
wave front
Correct answer is E
The wavefront of a time-varying field is the set of all points where the wave has the same phase of the sinusoid.
Which of the following statements is NOT true of the image in a plane mirror? The image is
the same size as the object
laterally inverted
virtual
magnified
the same distance behind the mirror as the object is in front
Correct answer is D
No explanation has been provided for this answer.
A pressure cooker saves both time and fuel in cooking because inside the cooker, the
boiling point of water is raised
pressure is constant
heat is completely trapped
temperature is evenly distributed
volume of steam varies
Correct answer is A
When atmospheric pressure increases, the boiling point becomes higher, and when atmospheric pressure decreases (as it does when elevation increases), the boiling point becomes lower.