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322 questions

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Question 141

neco 2000

A boy moving with a velocity of 3 ms^-1 is brought to rest by a constant force after travelling 15m. Calculate the retardation.

A0.15ms^-2

B0.30ms^-2

C0.60ms^-2

D3.33ms^-2

E6.66ms^-2

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Question 142

neco 2000

The length of a side of a metallic cube at 20° C is 5.0cm. Given that the linear expansively of the metal is 4.0 × 10^-5K^-1, find the volume of the cube at 120° C

A124.50cm³

B125.00cm³

C126.00cm³

D126.25cm³

E126.50cm³

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Question 143

neco 2000

The smallest unit on the sleeve of a micrometer screw gauge is 0.5mm. There are fifty divisions on the thimble of the screw gauge.
What is the smallest length that can be measured with this instrument?

A0.05cm

B0.01cm

C0.005cm

D0.001cm

E0.0001cm

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Question 144

neco 2000

Which of the following is/areNOT affected by a magnetic field?

I. Alpha particle
II. Cathode rays
III. Neutrons

AI only

BII only

CIII only

DI and II only

EI,II & III

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Question 145

neco 2000

Which of the following statements about evaporation and boiling is FALSE?

AEvaporation may take place at any temperature.

BIn evaporation, vapour escapes only from the surface of a liquid

CThe temperature remains constant as long as the liquid is boiling

DThe temperature at which boiling takes place can be altered by changing the external pressure

EThe rate of evaporation does not depend on temperature.

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Question 146

neco 2000

The image obtained on the screen of a pin-hole camera becomes less sharply defined when the

Aobject is moved farther from the pin-hole

Bscreen is moved farther from the pin-hole

Cobject is made smaller

Dillumination is made more intense

Epin-hole is made larger.

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Question 147

neco 2000

Which of the following is/are TRUE of nuclear fission?

I. A heavy nucleus is split into two nuclei of comparable masses
II. Two light nuclei are joined together to form a heavier nucleus
III. The total mass of the products is less than that of the reactants

AI only

BII only

CIII only

DI and III only

EII and III only

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Question 148

neco 2000

Which of the following pairs of light rays shows the widest separation in the spectrum of white light?

ARed and blue

BOrange and green

CRed and indigo

DViolet and green

EYellow and red

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Question 149

neco 2000

The image is a plane mirror is

Ainverted, real with a magnificant of \(\frac{1}{2}\)

Binverted, virtual with a magnification of 1

Cinverted, real with a magnification of 2

Dupright, virtual with a magnificent of 1

Eupright, real with a magnification of 2

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Question 150

neco 2000

A man standing 510m away from a wall sounds a whistle. The echo from the wall reaches him 3s later. Calculate the velocity of sound in air.

A170 ms-1

B340 ms-1

C680 ms-1

D765 ms-1

E1530 ms-1

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Question 151

neco 2000

An astronomical telescope which is being used to view a very distant object is said to be in normal adjustment if

Athe final image is at the near-point

Bthe image formed by the objective is before the focus of the eye piece

Cthe angular magnification is the ratio of the focal length of the eye-piece lens to that of the objective

Dthe foci dl the objective and the eye-piece coincide between the lenses

Ethe distance between the objective lens and the eye-piece is equal to the difference between their focal lengths.

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Question 152

neco 2000

Two 2.0Ω resistors can be combined circuit to give an overall resistance of

A0.5Ω only

B1.0 Ω only

Ceither 0,5Ω or 1.0 Ω

Deither 1.0Ω or 4.0 Ω

Eeither 0.5Ω, 1.0Ω or 4.0Ω

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Question 153

neco 2000

Calculate the peak voltage of a mains supply of r.ms. value 220V.

A121 V

B156 V

C225 V

D240 V

E311 V

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Question 154

neco 2000

If the first position of resonance in a resonance tube is 18.0cm from the open end, the distance from the open end to the next position of resonance will be

A24.0cm

B27.0cm

C36.0cm

D45.0cm

E54.0cm

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Question 155

neco 2000

The image formed by a converging lens of focal length is of a distance of 2f from the lens. Calculate the lateral magnification produced

A0.5

C1.5

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Question 156

neco 2000

An electric iron rated 250 V has a coil of resistance 125Ω. What is the cost of using it for I hour at 10k per kWh?

A1.25k

B2.50k

C5.00k

D10.00k

E20.00k

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Question 157

neco 2000

To keep a lorry moving at a constant speed v, requires power p, from the engine. The force provided by the engine is

A\(\frac{1}{2}\)v

Bpv

C\(\frac{p}{v}\)

Dpv²

E\(\frac{p}{v^2}\)

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Question 158

neco 2000

A man at the back of a crowd watches a parade by holding a plane mirror just above his head. The parade passes 6 metres behinde his head and the mirror is 0.25m in front of the man. How far does the image in the mirror appear to be from the man?

A6.50m

B6.25m

C6.00m

D5.75m

E5.50m

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Question 159

neco 2000

The unit of inductance is

AWeber

BTelsa

CHertz

DHenry

EFarad

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Question 160

neco 2000

A wave travels a distance of 20 cm in 3s. The distance between successive crests of the wave is 4cm. What is the frequency of the wave?

A0.60Hz

B1.67Hz

C7.50Hz

D15.00Hz

E26.67Hz

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