WAEC Physics Past Questions & Answers - Page 212

1,056.

The frictional effect between the layers of a moving fluid is called

A.

capillarity

B.

turbulence

C.

diffusion

D.

osmosis

E.

viscosity

Correct answer is E

No explanation has been provided for this answer.

1,057.

A radioactive nuclide of proton number X emits a \(\beta\)-particle to form a new nuclide to proton number Y. The correct equation relating X and Y is

A.

X = Y - 1

B.

X = Y + 1

C.

X = 1 - Y

D.

X = \(\frac{1}{y}\)

E.

X = Y

Correct answer is B

There is an increase in proton number by one in a beta-decay.

1,058.

The process of increasing the energy of an atom via inelastic collision with an electron is known as

A.

ionization

B.

excitation

C.

field emission

D.

photoemission

E.

thermionic emission

Correct answer is B

No explanation has been provided for this answer.

1,059.

The diagram above represents a section of a pair of vernier calipers. The reading on the instrument is

A.

5.22cm

B.

5.24cm

C.

5.26

D.

5.35

Correct answer is C

T\(\frac{1}{2}\) = \(\frac{0.693}{\pi}\)

= \(\frac{0.693}{0.077}\) = 9.0

1,060.

When light from a source is sent through a gas.

i. certain wavelengths are absorbed.
ii. a dark line is left.

Which of the following is/are correct?

A.

i only

B.

iii only

C.

i and ii only

D.

i and iii only

E.

ii and iii only

Correct answer is C

When light passes through gas in the atmosphere some of the light at particular wavelengths is scattered resulting in darker bands.