Jamb Physics 1980 Past Questions and Answers

Question 36:

• JAMB 1980

the ratio of the linear expansivity of copper to that of iron is approximately 1.5. A specimen of iron and a specimen of copper expands by the same amount per unit rise in temperature. The ratio of their length is

A. 3
B. 1.5
C. 1.32
D. 1
E. 0.67

Question 37:

• JAMB 1980

A man stands one-third of the way between two walls and claps his hands, He hears two distinct echoes 1s apart. If the speed of sound is 330ms^-1 the distance between the wall is

A. 33m
B. 110m
C. 220m
D. 330m
E. 495m

Question 38:

• JAMB 1980

A cell has an open circuit voltage V₁ and a closed circuit voltage V₂ when a current is flowing through it. Therefore, the internal resistance of the cell is

A. \(\frac{V_2}{I}\)
B. \(\frac{V_1}{I}\)
C. \(\frac{(V_1 + V_2)}{I}\)
D. \(\frac{(V_1 - V_2)}{I}\)
E. \(\frac{(V_2 - V_1)}{I}\)

Question 39:

• JAMB 1980

According to Ohm's law, the ratio V/I is constant for

A. An electrolyte
B. A diode
C. A transistor
D. Silver
E. All of the above

Question 40:

• JAMB 1980

In the process of electrification by induction, the amount of induced charge in relation to the inducing charge is the

A. Same in sign and quantity
B. Same in sign but greater
C. Opposite in sign but greater
D. Opposite in sign but less
E. Opposite in sign but equal