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50 questions

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Question 21

jamb 2005

A proton moving with a speed of 1.0 x 10\(^6\)ms\(^{-1}\) through a magnetic field of 1.0T experiences a magnetic force of magnitude 8.0 x 10\(^{-14}\) N. The angle between the proton's velocity and the field is

[1.6 x 10\(^{-19}\)C]

A60°

B90°

C30°

D45°

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Question 22

jamb 2005

the time it will take a certain radioactive material with a half-life of 50 days to reduce to 1/32of its original number is

A250days

B150days

C300days

D200days

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Question 23

jamb 2005

In an a.c circuit that contains only a capacitor, the voltage lags behind the current by

A180°

B90°

C60°

D30°

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Question 24

jamb 2005

An object is projected from a height of 80 m above the ground with a velocity of 40ms-1 at an angle of 30° to the horizontal. The time of flight [ g ≈ 10m/s\(^2\)

A8 s

B4 s

C16 s

D10 s

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Question 25

jamb 2005

In an ideal wheel an axle system, R stand for the radius of the wheel and r is the radius of the axle. the mechanical advantage is

A(R/r)²

Br/R

C(r/R)²

DR/r

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Question 26

jamb 2005

The pair of physical quantities consisting of vectors only are

Amomentum and power

Bvelocity and distance

Cdisplacement and torque

Daccelaration and speed

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Question 27

jamb 2005

A real image three times the size of an object is formed 24cm from a converging mirror. what is the focal length of the mirror.

A16cm

B6cm

C8cm

D12cm

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Question 28

jamb 2005

A thin converging lens has a power of 4.0 diopters determined its focal length.

A2.50m

B0.03m

C5.00m

D0.25m

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Question 29

jamb 2005

The sharpness of the boundary of the shadow of an object is determined by the

Aintensity of light striking the object

Brays of light passing through the object

Cnature of the object

Dopacity of the object

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Question 30

jamb 2005

Marching soldiers crossing a suspension bridge are usually advised to break their steps to avoid damaging the bridge owing to

Aoscillation

Bresonance

Cswinging

Dvibration

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