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JAMB Physics Past Questions & Answers - Page 304

1,516.

An object is projected with a velocity of 80ms^-1 at an angle of 30^o to the horizontal.The maximum height reached is

20m

80m

160m

320m

View answer & explanation

Correct answer is B

max. height = $\frac{U^2\sin^2\theta}{2g}$

= $\frac{80 \times 80 \times \sin^2(30)}{2 \times 10}$

= 80m

1,517.

A boat travels due east at a speed 40ms^-1s across a river flow due south at 30ms^-1s. What is the resultant speed of the boat?

1.3ms^-1

10.0ms^-1

50.0ms^-1

70.0ms^-1

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,518.

If it takes 5.0 hrs to drain a container of 540.0cm³ of water, what is the flow rate of water from the container in kg^-1? [Density of water = 1000kgm^-3]

32.5kg^-1 s

31.5kg^-1

30.8kg^-1 s

30.0kg^-1 s

View answer & explanation

Correct answer is D

Flow = rate = $\frac{mass}{time}$

= $\frac{1000 \times 540}{5 \times 3600}$

= 30.0kg^-1 s

1,519.

A light of energy 5eV falls on a metal and the electrons with a maximum kinetic energy of 2eV are ejected. The work function of the metal is

0.4eV

2.5eV

3.0eV

7.0eV

View answer & explanation

Correct answer is C

Work function = 5 - 2

= 3eV

1,520.

The primary winding of a transformer has 400 turns and its secondary has 100 turns. If a source of e.m.f. of 12V is applied to the primary, the secondary e.m.f. will be

24V

48V

View answer & explanation

Correct answer is A

$\frac{V_s}{V_p}$ = $\frac{N_s}{N_p}$ = $\frac{I_p}{I_s}$

$\frac{100}{400}$ = $\frac{V_S}{12}$

V = 3V

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