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47 questions

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Question 21

neco 2005

The following are derived units EXCEPT

Akg m^-3

CNs

Dm³

Ekg

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Question 22

neco 2005

An atom radiates 1.5 × 10^-19J when an electron jumps from one level to another. What is the wavelength of the emitted radiation? (Planck’s constant 6.6 × l0^-34Js ; Speed of light in vacuum = 3.0 × 108ms^-1)

A1.32 × 10^-6m

B2.97 × 10^-6m

C3.30 × 10^-6m

D6.82 × 10^-6m

E8.01 × 10m^-6

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Question 23

neco 2005

491 K is equivalent to

A273 °C

B218 °C

C373 °C

D491 °C

E764 °C

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Question 24

neco 2005

Which of the statements is/are true of two bodies involved in an inelastic collision? After collision.

I. the kinetic energy increases
II. The momentum decreases
III. Their velocities are the same.

AI only

BII Only

CIII only

DI and II only

EII and III only

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Question 25

neco 2005

A body moves along a circular path with uniform angular speed of 0.6 rad s^-1 and at a constant speed of 3.0 ms^-1.

Calculate the acceleration of the body towards the centre of the circle.

A0.2.ms^-2

B1.8 ms^-2

C5.0 ms^-2

D5.4 ms^-2

E25.0 ms^-2

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Question 26

neco 2005

An object is placed in front of a concave mirror whose radius of curvature is 12cm. If the magnification of the Image produced is 1.5, how far is the object from the mirror?

A8cm

B10cm

C15cm

D18cm

E20cm

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Question 27

neco 2005

The angle between the geographic and the magnetic meridians at a place on the earth’s surface is the

Aangle of declination

Bangle of depression

Cangle of dip.

Dlatitude of the place

Elongitude of the place

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