Question 81:

• JAMB 1979

Which of the following statements about radioactivity are true? i. alpha particle is positively charged ii. Beta particle is negatively charged iii. Gamma ray is neutral iv. Beta particle has the same mass as helium atom v. Gamma ray is charged

A. I, ii, iii and iv only
B. Iv and v only
C. I, ii and iii only
D. I, ii and v only
E. All

Question 82:

• JAMB 1979

Consider a thick glass tumbler and a thin glass tumbler which are made of the same kind of glass. Some hot liquid is poured into them. Which of the following statements is correct?

A. The thick tumbler is less likely to crack because it is stronger
B. The thick tumbler is less likely to crack because it insulates the heat beter, glass being a poor conductor of heat
C. Both tumblers are equally likely to crack because they are made of the same kind of glass
D. The thick tumbler is more likely to crack because uneven expansion persists for a longer time within the thicker glass
E. The thick tumbler is more likely to crack because it is heavier

Question 83:

• JAMB 1979

A capacitor and a resistor are connected in series with each other and in series with an accumulator of negligible internal resistance. The potential across the terminals of the capacitor is

A. Twice the e.m.f of the accumulator
B. Less than the e.m.f by the potential drop across the resistor
C. Zero
D. The same as the e.m.f.
E. Greater than

Question 84:

• JAMB 1979

Which of the following statements is true? The frequency of a vibrating string is

A. Proportional to its length
B. Inversely proportional to the tension within it
C. Proportional to the aptitude of vibration
D. Inversely proportional to its cross-section
E. Proportional to the square root of the tension within it

Question 85:

• JAMB 1979

An air bubble rises from the bottom to the top of a water dam which is 40m deep. The volume of the bubble just below the surface is 2.5cm³. Find its volume at the bottom of the dam, if atmospheric pressure is equivalent to 10m water

A. 0.0cm³
B. 2.0cm³
C. 1.6cm³
D. 0.625cm³
E. 0.5cm³