Question 4611:

• NECO 2009

A series RLC circuit is said to resonate, when ____________

A. Capacitive reactance is zero
B. Conductance is maximum
C. Current is minimum
D. Impedance is minimum
E. Inductive reactance is zero

Question 4612:

• NECO 2009

An observer heard the sound of thunder 5.8s after the lightning flash was seen. How far was he from the source? [Speed of sound in air = 330ms^-1]

A. 957m
B. 1914m
C. 3828m
D. 8700m
E. 17400m

Question 4613:

• NECO 2009

The space between the two walls of a vacuum flask is completely evacuated to reduce heat loss by ____________

A. Condensation
B. Conduction
C. Convection
D. Evaporation
E. Radiation

Question 4614:

• NECO 2009

Which of the following substances undergoes sublimation?

A. Ether
B. Ice
C. Iodine
D. Naphthalene
E. Turpentine

Question 4615:

• NECO 2009

Determine the value of x from the nuclear reaction below,

\(^{222}_{86}Rn\) → \(^{x}_{88}Ra\) + 2β + energy

A. 220
B. 222
C. 224
D. 226
E. 228