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101 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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101 questions

Question 1 of 20 101 total questions

Question 41

jamb 2019

When the downward current flows in a straight vertical conductor, the direction of its magnetic field at a point due north of the wire is?

AUpward

BNorth

CSouth

DWest

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Question 42

jamb 2019

The pitch of a screw jack is 0.45cm and the arm is 60cm long. If the efficiency of the Jack is 75/π %, calculate the mechanical advantage.

A400

B300

C200

D150

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Question 43

jamb 2019

A straight wire 15cm long, carrying a current of 6.0A is in a uniform field of 0.40T. What is the force on the wire when it is at right angle to the field

A0.46N

B0.35N

C0.36N

D0,24N

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Question 44

jamb 2019

The pin-hole camera produces a less sharply defined image when the

Apin-hole is larger

Billumination is less

Cscreen is further from the pin-hole

Dobject is further from the pin-hole

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Question 45

jamb 2019

A ray of light passes through the centre of curvature of a concave mirror and strikes the mirror. At what angle is the ray reflected?

A180\(^o\)

B90\(^o\)

C0\(^o\)

D60\(^o\)

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Question 46

jamb 2019

The distance between an object and its real image in a convex lens is 40cm. If the magnification of the image is 3, calculate the focal length of the lens

A6.5 cm

B7.5 cm

C8.5 cm

D4.5 cm

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Question 47

jamb 2019

When the temperature of a liquid is increased, its surface tension?

Aincreases

Bdecreases

Cremain constant

Dincreases then decreases

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Question 48

jamb 2019

Ripple in a power supply unit is caused by

Ausing an alternating current source

Bforward voltage drop

Cheavy load

Dusing a zener diode

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Question 49

jamb 2019

Which of the following equations is the correct definition of the reactance of an indicator L?

AReactance = (Amplitude of voltage) \(\div\) (Amplitude of current)

BReactance = (Amplitude of voltage) x (Amplitude of current)

CReactance = (Amplitude of current)\(^2\) \(\div\) (Amplitude of voltage)

DReactance = (Amplitude of current)\(^2\) \(\div\) (Amplitude of voltage)\(\frac{1}{2}\)

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Question 50

jamb 2019

Which of the following is/are the limitations to the Rutherford's atomic models?

I. It is applicable when energy is radiated as electrons are revolving

II. It is applicable when energy is radiated in a continuous mode

III. It is applicable to an atom with only one electron in the other shell

AI only

BII only

CI & II only

DI, II & III only

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Question 51

jamb 2019

Electrons were discovered by

ADalton

BJames Charwick

CJ.J. Thompson

DNiels Bohr

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Question 52

jamb 2019

In a slide wire bridge, the balance is obtained at a point 25cm from one end of wire 1m long. The resistance to be tested is connected to that end and a standard resistance of 3.6\(\Omega\) is connected to the other end of the wire. Determine the value of the unknown resistance

A3.2\(\Omega\)

B1.4\(\Omega\)

C3.21\(\Omega\)

D1.2\(\Omega\)

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Question 53

jamb 2019

During the transformation of matter from the solid to the liquid state, the heat supplied does not produce temperature increase because

Aall the heat is used to break the bonds holding the molecules of the solid together

Bthe heat capacity has become very large as the substance melts

Cthe heat energy is quickly conducted away

Dthe heat gained is equal to the heat lost by the substance

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Question 54

jamb 2019

Lamps in domestic lightings are usually in

Aseries

Bdivergent

Cconvergent

Dparallel

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Question 55

jamb 2019

A train has an initial velocity of 44m/s and an acceleration of -4m/s\(^2\). Calculate its velocity after 10 seconds

A10m/s

B6m/s

C8m/s

D4m/s

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Question 56

jamb 2019

The value of T in the figure above is

A30N

B10.0N

C20N

D40N

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Question 57

jamb 2019

According to kinetic molecular model, in gases

AThe molecule are very fast apart & occupy all the space made available

BThe particles occur in clusters with molecules slightly farther apart

CThe particles vibrate about fixed positions and are held together by the strong intermolecular bond between them

DThe particles are closely packed together, they occupy minimum space & are usually arranged in a regular pattern

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Question 58

jamb 2019

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

A200\(^o\)C

B300\(^o\)C

C100\(^o\)C

D-100\(^o\)C

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Question 59

jamb 2019

When blue and green colours of light are mixed, the resultant colour is

Acyan

Bmagenta

Cblack

Dyellow

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Question 60

jamb 2019

If a body moves with a constant speed and at the same time undergoes an acceleration, its motion is said to be

Aoscillation

Bcircular

Crotational

Drectilinear

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