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322 questions

Question 1 of 20 322 total questions

Question 21

neco 2009

Which of the following statements about the pressure in a liquid is NOT correct? It

Aacts in all direction

Bchanges with the material of the container

Cis the same at all points in the same horizontal plane

Dvaries with the density of the liquid

Evaries with the depth of the liquid

View Explanation & Discuss

Question 22

neco 2009

Determine the value of x from the nuclear reaction below,

\(^{222}_{86}Rn\) → \(^{x}_{88}Ra\) + 2β + energy

A220

B222

C224

D226

E228

View Explanation & Discuss

Question 23

neco 2009

Which of the following substances undergoes sublimation?

AEther

BIce

CIodine

DNaphthalene

ETurpentine

View Explanation & Discuss

Question 24

neco 2009

The space between the two walls of a vacuum flask is completely evacuated to reduce heat loss by

Acondensation

Bconduction

Cconvection

Devaporation

Eradiation

View Explanation & Discuss

Question 25

neco 2009

An observer heard the sound of thunder 5.8s after the lightning flash was seen. How far was he from the source? [Speed of sound in air = 330ms-1]

A957m

B1914m

C3828m

D8700m

E17400m

View Explanation & Discuss

Question 26

neco 2005

The most suitable instrument for measuring the diameter of a thin wire is a

Ameter rule

Bmicrometer screw gauge

Cpair of dividers

Dpair of engineer’s calipers

Evenire calipers

View Explanation & Discuss

Question 27

neco 2005

The wave theory of light does not explain photoelectricity because

Alight waves carry little energy

Bparticles cannot be emitted by waves

Cthe frequency of light waves too high

Dthere is a threshold wavelength for electron emission

Ethe wavelength of Light waves is too short.

View Explanation & Discuss

Question 28

neco 2005

The amplitude of oscillation of a simple pendulum bob diminishes slowly because

Aenergy is applied by some external agencies

Bfrictional forces dissipate the energy of motion

Cthe frequency of oscillation increases with the mass of the bob

Dthe frequency of oscillation varies with time

Ethe period of oscillation varies with time.

View Explanation & Discuss

Question 29

neco 2005

Notes of the same frequency sounded on a guitar and trumpet may differ in

I. loudness
II. Pitch
III. quality Which of the statements above is correct?

AI only

BII only

CIII only

DI and II only

EI, II and III

View Explanation & Discuss

Question 30

neco 2005

The motion of the wheel of a bicycle moving on a smooth straight road is

Aoscillatory and random

Boscillatory and translational

Crotational and oscillatory

Drotational and random

Erotational and translational

View Explanation & Discuss

Question 31

neco 2005

Which of the following is NOT a component of a slide projector?

AConcave mirror

BCondenser

CConvex mirror

Dlight source

EScreen.

View Explanation & Discuss

Question 32

neco 2005

A constant force acts on a body of mass 50kg and changes its speed from 20ms^-1 to 90ms^-1 in 10 seconds. Calculate the magnitude of the force applied.

A590N

B500N

C450N

D350N

E180N

View Explanation & Discuss

Question 33

neco 2005

Three non-parallel coplanar forces which can be represented both in magnitude and direction by the three sides of a triangle taken in order will

Ahave any one force being the equilibrant of the other two

Bmake a body move randomly

Cmake a body oscillate

Dmove a body along a straight line

Erotate a body about its axis

View Explanation & Discuss

Question 34

neco 2005

Radio receivers are tuned using

Aelectromagnets

Belectric motors

CInductors

Dvariable capacitors

Evariable resistors

View Explanation & Discuss

Question 35

neco 2005

An electric motor primary converts

Aelectrical energy to chemical energy

Belectrical energy to heat energy

Celectrical energy to mechanical energy

Dmechanical energy to electrical energy

Emechanical energy to light energy

View Explanation & Discuss

Question 36

neco 2005

Which of the following statements is/are correct? Sound waves travel through

I. air
II. vacuum
III.Water

AII only

BI and II only

CII and III only

DI and III only

EI, II, and III

View Explanation & Discuss

Question 37

neco 2005

Which of the following radiations has the shortest wavelength?

AInfrared rays

BLight waves

CMicrowaves

DUltraviolet rays

EX-rays

View Explanation & Discuss

Question 38

neco 2005

Which of the following is/are longitudinal wave(s)?

I. Light waves from the sun
II. Sound waves in the air
III. Waves on a vibrating string

AI only

BII only

CI and II only

DI and III only

EII and III only

View Explanation & Discuss

Question 39

neco 2005

A radio station broadcasts at a frequency of 400 kHz. If the speed of the wave is 3.0 ×10\(^{-8}\)ms\(^{-1}\), calculate the wavelength of the radio wave.

A1.3 × 10²m

B3.0 × 10²m

C2.4 × 10²m

D5.0 × 10²m

E7.5 × 10^-14m

View Explanation & Discuss

Question 40

neco 2005

A box is pulled a distance s along a smooth horizontal floor by a force of magnitude F, inclined at an angle θ to the horizontal. The work done is

AFs cos θ

BFs cosec θ

CFs sec θ

DFs sin θ

EFs tan θ

View Explanation & Discuss

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