A. CCl2F2
B. CCl3F
C. CClF3
D. CCl4F
Related Mcqs:
- Which of the following is an ore dressing operation ?
A. Classification
B. Smelting
C. Roasting
D. None of these - A gas which is collected over water becomes moistened due to water vapor, exerts its own partial pressure at the gas temperature, which is termed as its_______________?
A. Aqueous tension
B. Saturated humidity
C. Vapor pressure
D. Absolute humidity - __________________ of air does not increase with increase in temperature?
A. Density
B. Thermal diffusivity
C. Viscosity
D. Thermal conductivity - Material of construction of foundry crucible is _________________?
A. Lead
B. Stainless steel
C. Graphite
D. Cast iron - Which of the following is an unconventional source of energy ?
A. Thermal power
B. Hydroelectric power
C. Nuclear-fusion power
D. Solar power - Circular cross section machine parts which are symmetrical about the axis of rotation are made by hot_____________________?
A. Piercing
B. Spinning
C. Drawing
D. Extrusion - High speed steel tools retain their hardness upto a temperature of __________________ °C?
A. 500
B. 750
C. 900
D. 1100 - Chromium molybdenum steel cannot be welded using ______________ welding ?
A. Thermit
B. Electrical resistance
C. Oxy-acetylene
D. Any of these - Which of the following rays has the least wavelength ?
A. Ultraviolet rays
B. Infrared rays
C. Cosmic rays
D. X-rays - In extrusion of metals, which of the following statement is true ?
A. Speed of the extruded material is same as that of ram speed
B. Redundant work is a function of the die angle
C. Relative motion between the billet surface and the container wall is always present
D. Hollow ram is used for indirect extrusion