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JAMB Physics Past Questions & Answers - Page 137

681.

In the diagram above, a ray of light passes from glass into air, if the angle of incidence in glass is a and angle of refraction in air is $\beta$ which of following statements is true???

$\alpha = \beta$

the efractive index of glass is $\frac{sin\theta}{sin\alpha}$

The ray suffers total internal reflection if $\beta$ is greater than the critical angle

the efractive index of glass is $\frac{sin\alpha}{sin\beta}$

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

682.

In the diagram above, MN is perpendicular to ON and MR what is the difference between the moment about N of the force of 20 Newtons applied along MP an its moment about 0

Zero

0.2N.m

0.4N.m

0.8N.m

0.6N.m

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

683.

Given that SQ = 10cm and SP = 6cm, the refractive index of a block of glass shown above is

0.30

0.60

1.67

2.33

2.36

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

684.

What is the acceleration of a particle whose motion is graphically displayed in the diagram above

0.67ms^-2

0.83^-2

0.87^-2

92^-2

2.0^-2

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

685.

The total capacitance of the circuit above is?

0.25mF

0.50mF

0.75mF

1.25mF

1.50mF

View answer & explanation

Correct answer is E

CTotal in parralel = C1 + C2 + C3
CTotal = 2 + 2 + 2 → 6

C Total in series = 1 / C $_1$ + 1 / C $_2$

1 / C $_T$ = 1/2 + 1/6

1 / C $_T$ = $\frac{4}{6}$

cross multiply

C $_T$ = $\frac{3}{2}$ or 1.5mF

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