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46 questions

Question 1 of 20 46 total questions

Question 1

neco 2000

A boy ran a distance of 200m in 24s. His average speed was 8.3ms^-1. Which of the following is correct about the units in which the statements above are expressed?

AAll the units are fundamental.

BAll the units are derived

CAll the units except one are S.I units

DTwo of the units are fundamental and one derived.

ENone of the units is S.I units.

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Question 2

neco 2000

An electric bell operated within an evacuated bell jar enables us to infer correctly that

Alight waves require a medium for transmission

Bsound waves do not require a medium for transmission

Clight waves do not require a medium for transmission but sound waves do

Dlight waves travel much faster than sound waves

Elight waves and sound waves travel at the same speed

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Question 3

neco 2000

I. A scalar quantity has only magnitude
II. A scalar quantity has both magnitude and direction
III. A vector quantity has both magnitude and direction
IV. A vector quantity has only magnitude.

Which of the above statement is/are correct?

AI only

Bl and II only

Cl and III only

DII and III only

EII and III only

View Explanation & Discuss

Question 4

neco 2000

A block of a substance X will sink in a liquid V but float liquid Z. Which of the following statements is NOT correct about the densities of the three substances?

ADensity of liquid Z is greater than that of X

BDensity of liquid V is less than that of liquid X

CDensity of liquid Y is less than that of liquid Z

DLiquid Z has the greatest density of all the three substances.

EIf liquids V and Z do not mix, liquid Z will float on liquid V.

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Question 5

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 6

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 7

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 8

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 9

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 10

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 11

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

View Explanation & Discuss

Question 12

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 13

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 14

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 15

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 16

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 17

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 18

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 19

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 20

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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