metrology

The major load used in rockwell C hardness test is

• 100kg
• 200kg
• 150kg
• 60kg

The major load used in rockwell B hardness test is

• 100kg
• 200kg
• 150kg
• 60kg

The indentor used in rockwell B hardness test is

• Diamond pyramid
• Diamond cone
• Hardened steel ball
• Diamond ball

The indentor used in rockwell C hardness test is

• Diamond pyramid
• Diamond cone
• Hardened steel ball
• Diamond ball

When two light waves are combined, in such a way that the crest of one coincides with the trough of the other, they are out of phase by

• 360 ͦ
• 90 ͦ
• 180 ͦ
• 270 ͦ

When two light waves are out of phases by 180 the result will be

• troughs coincide
• double magnitude
• darkness
• crests coincide

A ray having single frequency and wavelength produces

• monochromatic light
• ordinary light
• bright band
• dark band

If both the waves having same amplitude are in phase the resultant intensity will be

• twice
• zero
• one
• none

If both the waves having same amplitude are out of phase the resultant intensity will be

• twice
• zero
• one
• none

If the path difference between the reflected rays is odd multiple of half wave length, _______ band will be observed

• bright
• dark
• nil
• colour