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141 questions

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Question 61

jamb 2001

The cost of running five 60 W lamps and four 100 W lamps for 20 hours if electrical energy cost #10.00 per kwh is

A280.00

B160.00

C120.00

D140.00

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Question 62

jamb 2001

A working electric motor takes a current of 1.5 A when the p.d across it is 250V. If its efficiency is 80%, the power output is

A300.0W

B469.0W

C133.0W

D4.8W

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Question 63

jamb 2001

A student is at a height 4m above the ground during a thunderstorm. Given that the potential difference between the thundercloud and the ground is 10\(^7\)V, the electric field created by the storm is

A2.0 x 10\(^6\) NC\(^{-1}\)

B2.5 x 10\(^6\) NC\(^{-1}\)

C1.0 x 10\(^7\) NC\(^{-1}\)

D4.0 x 10\(^7\) NC\(^{-1}\)

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Question 64

jamb 2001

A resistance R is connected across the terminal of an electric cell of internal resistance 2Ω and the voltage was reduced to 3/5 of its nominal value.
The value of R is

A3 Ω

B2 Ω

C1 Ω

D6 Ω

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Question 65

jamb 2001

A cell of internal resistance r supplies current to a 6.0Ω resistor and its efficiency is 75%. Find the value of r.

A4.5Ω

B1.0Ω

C8.0Ω

D2.0Ω

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Question 66

jamb 2001

A gas with initial volume of 2 X 10\(^{-6}m^3\) is allowed to expand to six times its initial value at constant pressure of 2 x 10\(^5Nm^{-2}\). The work done is?

A2.0J

B4. 0 J

C12.0 J

D2.4 J

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Question 67

jamb 2001

A string is fastened tightly between two walls 24cm apart. The wavelength of the second overtone is

A24cm

B16cm

C12cm

D8cm

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Question 68

jamb 2001

A plane sound wave of frequency 85.5Hz and velocity 342ms^-1 is reflected from a vertical wall. At what distance from the wall does the wave have antinode?

A2m

B4m

C1m

D3m

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Question 69

jamb 2001

The thermometric substance of an absolute thermometer is

Aalcohol

Bmercury

Chelium

Dplatinum

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Question 70

jamb 2001

The pressure of a given mass of a gas changes from 300Nm\(^{-2}\) to 120Nm\(^{-2}\) while the temperature drops from 127°C to -73°C. The ratio of the final volume to the initial volume is

A2 : 5

B5 : 4

C4 : 5

D5 : 2

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Question 71

jamb 2001

The driving mirror of a car has a radius of curvature of 1m. A vehicle behind the car is 4m from the mirror. Find the image distance behind the mirror.

A8/7

B4/9

C9/2

D4/7

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Question 72

jamb 2001

The terrestrial telescope has one extra lens more than the astronomical telescope. The extra lens is for

Aimproving the sharpness

Bcreating an inverted image

Cmagnification of the image

Derection of the image

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Question 73

jamb 2001

A ray of light strikes a plane mirror at an angle of incidence of 35°. If the mirror is rotated through 10°, through what angle is the reflected ray rotated?

A70°

B45°

C25°

D20°

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Question 74

jamb 2001

Ice cubes are added to a glass of warm water. The glass and water are cooled by

Aconduction only

Bconvection only

Cconduction and convection

Dconvection and radiation

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Question 75

jamb 2001

Which of the following consists entirely of vector quantities?

AVelocity, displacement and reaction

BTension, magnetic flux and mass

CDisplacement, impulse and power

DWork, pressure and moment

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Question 76

jamb 2001

The efficiency of a machine is always less than 100% because the

Awork output is always greater than the work input

Bload lifted is always greater than the effort applied

Ceffort applied is always greater than the load lifted

Dvelocity ratio is always greater than the mechanical advantage

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Question 77

jamb 2001

I. The earth is not spherical but elliptical in shape
II. Variation in latitude and longitude
III. Rotation of the earth on its axis
IV. Variation in the density of the earth

On which combination of the above does the weight of an object vary on the earth's surface?

AI, II, III and IV

BIII and IV only

CI, II and III only

DI and II only

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Question 78

jamb 2001

The resultant of two forces acting on an object is maximum if the angle between them is

A45°

B0°

C90°

D180°

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Question 79

jamb 2001

If a spherical metal bob of radius 3cm is fully immersed in a cylinder containing water and the water level rises by 1cm, what is the radius of the cylinder?

A12cm

B1cm

C3cm

D6cm

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Question 80

jamb 2001

A stone of mass 1kg is dropped from a height of 10m above the ground and falls freely under gravity. Its kinetic energy 5m above the ground is then equal to

Aits kinetic energy on the ground

Btwice its initial potential energy

Cits initial potential energy

Dhalf its initial potential energy

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