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JAMB Physics Past Questions & Answers - Page 242

1,206.

Two objects, one having three times the mass of the other, are dropped at the same time from a tall building. When they are above the ground, the two objects will have the same?

Momentum

Kinetic energy

Potential energy

Acceleration

View answer & explanation

Correct answer is D

Potential energy is energy possessed by a body by virtue of its position. when the body is above the ground, it possesses kinetic energy.

acceleration due gravity is at constant value of 10m/s $^2$

1,207.

A heavy object is suspended from a string and lowered into water so that it is completely submerged. The object appears lighter because

the density of water is less than that of the object

the pressure is low just below the water surface

it experiences an upthrust

the tension in the string neutralizes part of the weight

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,208.

Which of the following represents the correct precision if the length of a piece of wire is measured with a meter rule?

35mm

35.0mm

35.00mm

35.01mm

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

1,209.

A radioactive sample initially contains N atoms. After three half-lives the number of atoms that have disintegrated is

$\frac{N}{8}$

$\frac{3N}{8}$

$\frac{5N}{8}$

$\frac{7N}{8}$

View answer & explanation

Correct answer is D

N $\to$ $\frac{N}{2}$ $\to$ $\frac{N}{4}$ $\to$ $\frac{N}{8}$

Number of atoms left = 1-1/8= $\frac{7N}{8}$

1,210.

Isotopes are nuclei which have

the same number of nuetrons and electrons

equal number of electrons and protons

the same atomic number but different number of neutrons

the same number of total particles

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

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