Question 4516:

• NECO 2004

What is the uncertainty in the measurement of time, if the uncertainty in measuring the energy of an electron of mass 10^-30 kg is 2.45 × 10^-19J? h = 6.6 × 10^-34

A. 1.35 ×10^-15s
B. 2.69 × 10^-15s
C. 4.15 × 10^-15s
D. 9.05 × 10^-15s
E. 1.62 × 10^-14s

Question 4517:

• NECO 2004

A body has masses of 0.013kg and 0.012 kg in oil and water respectively. If the relative density of oil is 0.875 calculate the mass of the body.

A. 0.02 kg
B. 0.03kg
C. 0.04kg
D. 0.05kg
E. 0.06kg

Question 4518:

• NECO 2004

A stone is dropped from the top of a tower of height 11 .25m. Calculate the time it will take to reach the ground. [g = 10ms-2]

A. 1.00s
B. 1.50s
C. 2.25s
D. 2.50s
E. 3.00s

Question 4519:

• NECO 2004

The rate of diffusion of gases increases with increase(s) in

I. density
II. temperature
III, mass. Which is/are correct?

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

Question 4520:

• NECO 2004

In which of the following are crystalline structures observable?

I. Gas
II. Liquid
III. Solid

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