The units of the rate constant for a second order reaction are:
A. Sec-1. mole°
B. Moles1. sec-1
C. Moles-1. sec1
D. Moles1. sec1
Between 230 and 370°C, blue brittleness is caused in mild steel because of the:
A. Immobility of dislocation
B. Strain-ageing
C. Increase in Young’s modulus
D. Strain hardening
Principal alloying element in Elinvar (used for making hair springs for watches) is:
A. Copper
B. Aluminium
C. Nickel
D. Zinc
Neutrons are present in all atoms except that of:
A. He
B. C
C. H
D. Ar
An atom bomb works on the principle of:
A. Nuclear fission
B. Nuclear fusion
C. Both the nuclear fission & fusion
D. Ionisation
A psychrometer does not measure the _____ temperature of moist air:
A. Dew point
B. Dry bulb
C. Wet bulb
D. None of these
With increase in _____ Knocking tendency in a spark ignition petrol engine decreases:
A. Supercharging
B. Wall temperature
C. Compression ratio
D. Engine speed
Read More: Chemistry MCQs for all classes, admissions test and competitive exams preparation.
