Who discovered proton in the nucleus of an atom?
A. Chadwick
B. JJ Thomson
C. Gold Stein
D. Bohr
Submitted by: Aslam
Which symbol is used for the element of Tin
A. Au
B. Sn
C. Fe
D. Hg
Submitted by Hasnain Ali
A chronometer is used for measuring _____?
A. Temperature
B. Current
C. Velocity
D. Longitude
♦ Credit To: Wasim Khan ♦
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