JAMB Physics Past Questions & Answers - Page 225

1,121.

Which of the following is NOT a vector quantity?

A.

Force

B.

Altitude

C.

weight

D.

Displacement

E.

Acceleration

Correct answer is B

No explanation has been provided for this answer.

1,122.

In a resonance tube experiment, a tube fixed length is closed at one end and several tuning forks of increasing frequency used to obtain resonance at the open end. If the tuning fork with the lowest frequency which gave resonance had a frequency f1 and the next tuning fork to give resonance had a frequency f2, find the ratio \(\frac{f^2}{f^1}\).

A.

8

B.

3

C.

2

D.

\(\frac{1}{2}\)

E.

\(\frac{1}{3}\)

Correct answer is B

\(\lambda_1\) = 4L1 and \(\lambda_2\) = -L1

F\(\lambda\) = velocity

F1 x \(\lambda_1\) = F2 x
\(\lambda_2\) ; F1 x 4\(\lambda_1\) = F2 x -\(\lambda_2\)

= \(\frac{F_2}{F_1}\) = 3

1,123.

A galvanometer of resistance 5.0Ω has full-scale deflection for a current of 100mA. How would its range be extended to 1.0A? By placing a resistance of

A.

\(\frac{5}{9}\)\(\Omega\) in parallel

B.

\(\frac{9}{5}\)\(\Omega\) in series

C.

45\(\Omega\) in parallel

D.

45\(\Omega\) in series

E.

\(\frac{9}{5}\)\(\Omega\) in parallel

Correct answer is A

Given Data:
I\(_g\) = 100ma = 0.1A
R\(_g\)=5
where I\(_s\) = I - I\(_g\) → 1 - 0.1

I\(_s\) = 0.9

I\(_g\)R\(_g\) = I\(_s\)R\(_s\)


0.1 * 5 = 0.9 * R\(_s\)
R\(_s\) = \(\frac{0.1 * 5}{0.9}\)

R\(_s\) = \(\frac{5}{9}\)

1,125.

Which of the following

i. \(\beta\)-particles
ii. protons
iii. neutrons
iv. \(\alpha\)-particles.

may be found in light nuclei?

A.

i and ii

B.

i and iii

C.

ii and iv

D.

ii and iii

E.

i, ii and iii

Correct answer is D

No explanation has been provided for this answer.