A. Carbon dioxide gas
B. Liquid sodium metal
C. Concrete shield
D. Graphite rods
E. Boron rods

Correct Answer:

Option D – Concrete shield

SEE ALSO  A uniform metre rule of mass 90g is provided at the 40cm mark. If the rule is in equilibrium with an unknown mass m placed at the 10cm mark and a 72g mass at the 70cm mark, determine M

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