Question 4396:

• NECO 2001

A body whose initial velocity is u is uniformly accelerated to a final velocity v in t seconds. If the distance travelled is s, and the acceleration is a, which equation is INCORRECT for the motion of the body?

A. S = ut+\(\frac{1}{2}\)at²
B. V² = u² + 2as
C. V =u + at
D. V = u + 2as
E. S = \(\frac{1}{2}\)(u+v)t

Question 4397:

• NECO 2001

Which material is best for making a permanent magnet?

A. Aluminium
B. Cobalt
C. Copper
D. Soft iron
E. Steel

Question 4398:

• NECO 2001

A cell can supply currents of 0.60 A and 0.30 A through a 2.0 ω and a 5.0 ω resistor respectively. What is the internal resistance of the cell?

A. 0.2 ω
B. 0.4 ω
C. 1.0 ω
D. 3.0 ω
E. 9.0 ω

Question 4399:

• NECO 2001

Which statement is a correct consequence of the uncertainly principle?

A. A particle’s kinetic energy cannot be measured accurately at any time
B. Both momemtum and energy of a particle can be known with absolute certainly
C. It is possible to measure exactly both the position and momentum of a particle at the same time
D. The complete knowledge of the position of a particle implies the complete ignorance of its energy
E. The uncertainty in our knowledge of energy and the duration taken to measure it, are each less than Planck’s constant.

Question 4400:

• NECO 2001

Which statements(s) is/are NOT true?

I. A saturated vapour is one that is in equilibrium with its liquid in a closed space. II. A vapour contains molecules with varying kinetic energy and their distances apart are smaller than those of the molecules of a liquid
III. Relative Humidity = \(\frac{\text{Saturated vapour pressure at dew point}} {\text{Saturated vapour pressure at air temperature}}\) x 100%

IV. The saturated vapour pressure of water increases with temperature

A. I only
B. II only
C. II and III only
D. III and IV only
E. II, III and IV only