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150 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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150 questions

Question 1 of 20 150 total questions

Question 51

jamb 2019

Water and Kerosine are drawn respectively into the two limbs of a Hare's apparatus. The destiny of water is 1.0gcm\(^{-3}\) and the density of kerosine is 0.80gcm\(^{-3}\). If the height of the water column is 20.0cm, calculate the height of the kerosine column.

A1.6cm

B16.0cm

C20.0cm

D25.0cm

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Question 52

jamb 2019

In semi-conductor, the carriers of current at room temperature are

Aelectrons only

Belectrons and holes

Choles only

Delectron and ions

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Question 53

jamb 2019

An a.c of 1A at a frequency of 800 cycles per second flows through a coil, the inductance of which is 2.5mH and the resistance of which is 5Ω. What is the power absorbed in the Coil?

A5W

B6W

C7W

D8W

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Question 54

jamb 2019

Three resistors with resistance 200Ω, 500Ω and 1kΩ are connected in series. A 6v battery is connected to either end of the combination. Calculate the potential difference between the ends of 200Ω resistance.

A0.71V

B0.7V

C0.82V

D0.8V

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Question 55

jamb 2019

The mass of a nucleus is the

Atotal number of its proton & neutrons

Bnumber of its protons

Cmass of its electrons

Dtotal number of its protons & electrons

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Question 56

jamb 2019

Neutrons were discovered by

AFaraday

BDalton

CJames Chadwick

DRutherford

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Question 57

jamb 2019

Gases conduct electricity under

Ahigh pressure & high voltage

Blow pressure & low voltage

Cnormal pressure & low voltage

Dlow pressure & high voltage

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Question 58

jamb 2019

A man on a bench will exert the greatest pressure on the bench when he

Alies flat on his back

Blies flat on his belly

Cstands on both feet

Dstands on the toes of one foot

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Question 59

jamb 2019

A siren having a ring of 200 hole makes 132 rev/min. A jet of air is directed on the set of holes. Calculate the frequency and wavelength in air of the note produced (take v = 350m/s)

A0.795m

B0.625m

C0.335m

D0.125m

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Question 60

jamb 2019

A mixture of blue and red pigment when illuminated by white light will appear

Agreen

Borange

Cyellow

Dmagenta

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Question 61

jamb 2019

When water is boiling, it

Agets hotter

Bincrease is mass

Cdecreases in mass

Dchanges to steam

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Question 62

jamb 2019

The lead-acid accumulator consists of

Alead as the positive electrode

Blead acid as the negative electrode

Chydrochloric acid as the electrolyte

Dtetraoxosulphate (vi) acid as the electrolyte

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Question 63

jamb 2019

A metal rod has a length of 100cm at 200°C. At what temperature will its length be 99.4cm. If the linear expansivity of the material of the rod is 2 × 10\(^{-5}\)C\(^{-1}\)

A\(300^0C\)

B\(200^0C\)

C\(100^0C\)

D\(-100^0C\)

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Question 64

jamb 2019

The momentum of a car moving at a constant speed in a circular track

Acan be both positive and negative

Bcan be zero depending on its position in the track

Ccan be zero depending on its inertia in the track

Da centrifugal

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Question 65

jamb 2019

A force of 6N acts horizontally on a stationary mass of 2kg for 4s. The kinetic energy gained by the mass is _________

A366j

B240j

C144j

D90j

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Question 66

jamb 2019

The following are parts of the eye
I. Retina
II. Pupil
III. Iris
The correct equivalent in the camera in the same order are

ADiaphragm, Aperture, film

BAperture, Diaphragm, Film

CFilm, Diaphragm, Aperture

DFilm, Aperture, Diaphragm

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Question 67

jamb 2019

The earth's gravitational field intensity at its surface is about
(G = 6.7 × 10\(^{-11}\)Nm\(^2\)/kg\(^2\), mass of the earth is 6 × 10\(^{24}\)kg, radius of the earth is 6.4 × 10\(^6\)m, g on the earth = 9.8m/s\(^2\))

A6.7N/kg

B7.9N/kg

C8.0N/kg

D9.8N/kg

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Question 68

jamb 2019

Which of the following media allow the transmission of sound waves through them?
I. air
II. liquid
III. solids

AI & II only

BI & III only

CII & III only

DI, II & III

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Question 69

jamb 2019

The conductivity of gases at low pressure can be termed as
I. hot cathode emission
II. thermo ionic emission
III. cold cathode emission
IV. Field emission

AI & II

BII & III

CIII & IV

DIV & V

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Question 70

jamb 2019

In the molecular explanation of conduction, heat is transferred by the

AFree electrons

BFree atoms

CFree molecules

DFree solids

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