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JAMB Physics Past Questions & Answers - Page 93

461.

in a nuclear fission process, the mass defect was 1.2 x 10^-5kg. Calculate the energy released. [speed of the light in vacuum = c = 3.0 x 10⁸ms^-1]

1.08 x 10¹¹J

5.20 x 10¹¹J

1.08 x 10¹²J

2.50 x 10¹³J

View answer & explanation

Correct answer is C

E - Mec²

E = 1.2 x 10^-5 x (3 x 10⁸)²

E = 1.08 x 10¹²J

462.

When current flows through a moving-coil galvanometer, the force exerted on the pointer depends on the: i. strength of the current. ii. magnetic field strength. iii. length of the coil. Which of the statement(s) above is/are correct?

i only

ii only

i and iii only

i, ii and iii

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

463.

What must be connected between the points P and Q to establish a steady current through the incomplete circuit diagram given?

Fuse

ammeter

Cell

voltmeter

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

464.

The angle which the direction of the earth magnetic field makes with the horizontal at a palace is know as.

angle of contact

angle of dip

angle of declination

magnetic meridian

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

465.

The mass of the earth is 6.0 x 10²⁴kg and that of the moon is 7.0 x 10²²kg. If the distance between them is 4.0 x 10⁸m, calculate the force of attraction between them. [G = 6.7 x 10^-11Nm²kg^-2]

1.8 x 10⁵N

1.8 x 10¹⁰N

1.8 x 10¹⁵N

1.8 x 10²⁰N

View answer & explanation

Correct answer is D

F = $\frac{GM_1M_2}{12^2}$

F = 6.7 x 10^-11x

F = $\frac{M_1M_2}{R^2}$

F = $\frac{6.7 \times 10^{-11} \times 6.0 \times 10^{24} \times 7.0 \times 10^{22}}{(4 \times 10^8)^2}$

= 1.8 x 10²⁰N

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