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JAMB Physics Past Questions & Answers - Page 106

526.

A radioactive isotope has a decay constant of 10-6s-1.
Calculate its half - life?

5.93 x 10⁶s

6.93 x 10⁵s

6.93 x 10⁹s

5.93 x 10⁷s

View answer & explanation

Correct answer is B

t1/2 = $\frac{0.693}{\gamma}$ = $\frac{0.693}{10^-6}$

= 6.93 x 105

527.

Which of the following electromagnetic waves has the shortest wavelength?

Visible Light

Ultraviolet rays

Infrared rays

Gamma rays

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

528.

A train with an initial velocity of 20ms^-1 is subjected to a uniform deceleration of 2ms^-2. The time required to bring the train to a complete halt is

40s

10s

20s

View answer & explanation

Correct answer is B

t = $\frac{v - u}{a}$ = $\frac{20 - 0}{2}$

= 10s

529.

A projectile is fired from the ground level with a velocity of 300ms-1 at an angle of a 30o to the horizontal.
Calculate the time taken to reach the maximum height?
[g = 10ms-2]

30s

20s

25s

15s

View answer & explanation

Correct answer is D

The total time of flight is given as

$T = \frac{2usin\theta}{g}$

Hence, time to maximum height is half of the total time of flight,

t = $\frac{u sin\theta}{g}$

= $\frac{300 \text {sin} 30}{10}$ = 15s

530.

A metre rule is pivoted at its mid-point with a vertical force of 10N hanging from the distance 30cm from the mid-point. At what distance must a 15N force hang to balance the ruler horizontally?

30cm

10cm

20cm

25m

View answer & explanation

Correct answer is C

Clockwise moment = Anti-clockwise moment
10 x 30 = 15 x X
X = 20cm

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