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4,719 questions

Question 1 of 20 4,719 total questions

Question 1481

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 1482

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 1483

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.

View Explanation & Discuss

Question 1484

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 1485

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 1486

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 1487

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 1488

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 1489

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 1490

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 1491

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 1492

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 1493

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 1494

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 1495

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 1496

neco 2000

The unit of inductance is

AWeber

BTelsa

CHertz

DHenry

EFarad

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Question 1497

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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Question 1498

neco 2000

If a positively charged glass-rod is used to charge an electroscope X by contact and an electroscope Y by induction, then

AX and Y will be negatively charge

BX and Y will be positively charged

CX will be negatively charged and Y positively charged

DX will be positively charged and Y negatively charged

EX will be positively charged and Y will remain uncharged

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Question 1499

neco 2000

The clinical thermometer differs from other mercury-in-glass thermometers because it has

I. a constriction
II. a wide range
III. a short range
IV. a narrow bore.

Which of the above are correct?

AI and II only

BI and III only

CIII and IV only

DI,II and III only

EI, III and IV only

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Question 1500

neco 2000

In a simple pendulum experiment, a boy observed that the times for 30 oscillations are 70.0s, 72.0s and 67.0s respectively. Calculate the mean period of oscillation of the pendulum.

A0.14s

B0.43s

C2.32s

D2.40s

E6.97s

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