A. He
B. C
C. H
D. Ar
Related Mcqs:
- In an amorphous material, atoms defy any definite atomic structure and exist in random pattern just like in liquid. Which of the following is an amorphous material ?
A. Tin
B. Lead
C. Zinc
D. Glass - There are one octahedral void and ______________ tetrahedral void in the closest packing of atoms ?
A. One
B. Two
C. Three
D. None of these - Atoms of the same element, but of different masses are called__________________?
A. Isobars
B. Isotones
C. Isotopes
D. None of these - Isotopes are atoms having the same _____________________?
A. Mass number
B. Number of neutrons
C. Atomic mass
D. None of these - The total number of atoms in 8.5 gm of NH3 is _______________ × 1023?
A. 9.03
B. 3.01
C. 1.204
D. 6.02 - The wet bulb temperature is lower in dry air than in wet air at the same temperature. A dry bulb thermometer registers a higher temperature than a wet bulb thermometer except at ______________ percent relative humidity ?
A. 0
B. 100
C. 50
D. None of these - All gases except ____________ shows a cooling effect during throttling process at atmospheric temperature and pressure?
A. Oxygen
B. Nitrogen
C. Air
D. Hydrogen - The expression for the work done for a reversible polytropic process can be used to obtain the expression for work done for all processes, except reversible _____________ process?
A. Isobaric
B. Isothermal
C. Adiabatic
D. None of these - Addition of silicon to cast iron ___________________?
A. Promotes graphite module formation
B. Improves its ductility
C. Does not promote graphite flakes formation
D. Increases the fluidity of molten metal - With increase in ___________________ Knocking tendency in a spark ignition petrol engine decreases?
A. Supercharging
B. Wall temperature
C. Compression ratio
D. Engine speed
