NECO Past Questions and Answers - Page 183

911.

Which of the following cells does not require a dipolar for effective and efficient delivery of current?

A.

Daniel cell

B.

Dry Leclanche cell

C.

Nickel-iron accumulator

D.

Voltaic cell

E.

Wet Leclanche cell

Correct answer is C

No explanation has been provided for this answer.

912.

When a resistor of resistance R is connected across a.c. the terminal p.d. of the cell is reduced to three-quart its e.m.f. The cell’s internal resistance in terms of R is

A.

\(\frac{R}{4}\)

B.

\(\frac{R}{3}\)

C.

\(\frac{R}{2}\)

D.

2\(\frac{R}{3}\)

E.

R

Correct answer is A

No explanation has been provided for this answer.

913.

The variance of a given set of numbers is defined as the

A.

Absolute value of the standard deviation

B.

Square of the standard deviation

C.

Square root of the standard deviation

D.

Square root of the standard deviation

E.

Square root of the mean deviation

Correct answer is B

No explanation has been provided for this answer.

914.

The equation PxVyTz = Constant is Charles’ law if

A.

x = 0, y = 1 and z = -1

B.

x = 0, y = -1 and z = 1

C.

x = 1, y = 1 and z = 0

D.

x = 1, y = 1 and z = -1

E.

x = 1, y = 1 and z = 1

Correct answer is A

No explanation has been provided for this answer.