Question 381:

• JAMB 1985

Which of the following statements is NOT correct?

A. The average range of distinct vision for a normal eye is from the far distance (infinity) up to about 25cm in front of the eye
B. Longsighted people have difficulty in making the eye lense sufficiently powerful to focus on nearby objects
C. Shortsighted people cannot accommodate distant objects
D. Longsighted people need diverging spectacle lenses
E. A person with long sight has his eye-ball too short and the image of an object is therefore formed behind the retina

Question 382:

• JAMB 1985

Which of the following features is NOT a characteristic of natural radioactivity?

A. Radioactivity is a nuclear phenomenon
B. Radioactivity is exhibited only by elements of mass number greater than 206
C. The radioactivity of an element is affected by electric and magnetic fields in the surroundings
D. Radioactive substances emits three types of radiations, a-rays, \(\beta\)-rays and y-rays
E. The radioactive element is transformed into a new element

Question 383:

• JAMB 1985

What is the number of neutrons in the Uranium isotope \(^{238}_{92}X\)?

A. 92
B. 146
C. 238
D. 330
E. 119

Question 384:

• JAMB 1985

Normal atmospheric pressure at sea-level is 10⁵Nm^-2 and the acceleration due to gravity is approximately 10ms^-1. If the atmosphere has a uniform density of 1kgm^-3, its height is

A. 100m
B. 1000m
C. 10 000m
D. 100 000m
E. 1000 000m

Question 385:

• JAMB 1985

In the Fig above, Current I passes through the combination, if the power dissipated in the 5 ohm resistor is 40W, then the power dissipated in the 10 ohm resistor is

A. 10W
B. 20W
C. 40W
D. 80
E. 100W