Question 4526:

• NECO 2004

Which of the following is used as a depolarizer in a Denial cell?

A. Ammonium chloride
B. Copper (II) tetra Oxo sulphate (VI) solution
C. Manganese (IV) oxide
D. Tetraoxo sulphate (VI) acid
E. Water

Question 4527:

• NECO 2004

A radioactive isotope has a half-life of 8 days. What fraction of the atoms will remain after 72 days?

A. 9.766 × 10^-4
B. 1.736 ×10^-3
C. 1.953 ×10^-3
D. 3.472 × 10^-3
E. 3.906 x 10^-3

Question 4528:

• NECO 2004

If the distance between the plates of a parallel plate capacitor is decreased, its capacitance ____________

A. Becomes zero
B. Decreases
C. Increases
D. Is halved
E. Remains the same

Question 4529:

• NECO 2004

The resultant of two forces P and Q is least when the angle between them is ____________

A. 0°
B. 45°
C. 60°
D. 90°
E. 180°

Question 4530:

• NECO 2004

A ray of light experiences a minimum deviation when passing through an equilateral triangular glass prism. Calculate the angle of incidence of the ray. [Refractive index of glass = 1.5]

A. 300.0°
B. 48.6°
C. 60.0°
D. 75.5°
E. 105.0 °