Physics Past Questions and Answers

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 197:

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 198:

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 199:

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 200:

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