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50 questions

Question 1 of 10 50 total questions

Question 21

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 22

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 23

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 24

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 25

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 26

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 27

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 28

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 29

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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Question 30

jamb 2001

The height at which the atmosphere ceases to exist is about 80km. If the atmospheric pressure on the ground level is 760mmHg, the pressure at a height of 20km above the ground level is

A380mmHg

B570mmHg

C190mmHg

D480mmHg

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