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JAMB Physics Past Questions & Answers - Page 195

971.

A milliameter of resistance 5 $\Omega$ and full scale deflection of 5m A is to used to measure a potential difference of 50 V. The resistance of the multiplier should be

95 $\Omega$

110 $\Omega$

595 $\Omega$

995 $\Omega$

1005 $\Omega$

View answer & explanation

Correct answer is D

V = IR

50 = 50 x 10^-3 (5 + R)

R = 995 $\Omega$

972.

A tugboat is travelling from Asaba to Onitsha across the River Niger with a resultant velocity of 20 knots. If the river flows at 12 knots, the direction of motion of the boat relative to the direction of water flow is?

36.87^o

53.13^o

90^o

136^o

143.13^o

View answer & explanation

Correct answer is B

$\theta$ = cos-1 $\frac{(12)}{20}$

$\theta$ = 53.13°

973.

A stand-by generator is connected to fifteen 40 W lamps and musician's 600 W amplifying system. How much energy is used if the generator runs for 6 hours?

3.84k Wh

7.20k Wh

8.40k Wh

12.00k Wh

14.56k Wh

View answer & explanation

Correct answer is B

Total power = (15 x 40) + 600

= 1200 watts

Energy(kWh) = $\frac{1200}{1000}$ x 6

= 7.2 kwH

974.

A quantity of sungas at -133 occupies 1/3m³ under pressure 1.4 x 10⁵ Nm^-2. if the gas occupies 31 m^-2 at 37^oC, its pressure will be

1.26 x 10³Nm^-2

3.3 x10⁴Nm^-2

1.35 x 10⁴Nm^-2

2.2 x 10⁴Nm^-2

10⁵Nm^-2

View answer & explanation

Correct answer is B

$\frac{P_1V_1}{T_1}$ = $\frac{P_2V_2}{T_2}$

= $\frac{\frac{1}{3} \times 1.4 \times 10^5}{-133 + 273}$ = $\frac{P_2\times31}{37 +273}$

P₂ = 3.3 x 10

975.

If the magnification of a virtual image formed of an object 10cm from a convex lens is 3, then the focal length of the lens is

10cm

15cm

16cm

19cm

20cm

View answer & explanation

Correct answer is B

V = 3u, U = 10cm

therefore U = -ve,

F = $\frac{UV}{U + V}$

= $\frac{10 \times (-30)}{10 - 30 }$

= 15cm

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