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146 questions

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Question 61

jamb 2004

In a hydraulic press , a force of 40N is applied on the effort piston of area 0.4m². If the force exerted on the load piston is 400N, the area of the large piston is

A4m²

B8m²

C2m²

D1m²

View Explanation & Discuss

Question 62

jamb 2004

I. Jet propelled aircraft
II. Rocket propulsion
III. The recoil of a gun
IV. A person walking
Which of the above is based on Newton's third law of motion

AI and II only

BI, II, III, and IV only

CI and III only

DI, II and III only

View Explanation & Discuss

Question 63

jamb 2004

A machine whose efficiency is 60% has a velocity ratio of 5. If a force of 500N is applied to lift a load P, what is the magnitude of P?

A1500N

B500N

C4166N

D750N

View Explanation & Discuss

Question 64

jamb 2004

A body of mass 4kg is acted on by a constant force of 12N for 3 seconds. The kinetic energy gained by the body at the end of the time is

A144J

B162J

C81J

D72J

View Explanation & Discuss

Question 65

jamb 2004

If the angle between two vectors P and Q is Oº, the vectors are said to

Aintersect at the angle 45^o

Bintersect at the angle 60^o

Cbe parallel

Dbe perpendicular

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Question 66

jamb 2004

In the diagram above, the ratio of he electric power dissipated in the 6Ω and the 3Ω resistor respectively is

A2:1

B2:2

C1:3

D1:2

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Question 67

jamb 2004

To protect a material from the influnce of an external magnetic field, the materials should be kept

Asquare steel ring

Btriangular zinc ring

Csoft iron ring

Dloop of copper wire

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Question 68

jamb 2004

The difference between X-rays and gamma rays is that

Ax-rays are more penetrating than gamma rays

Bx-rays are electromagnetic radiations while gamma rays are negatively charged radiation

Cx-rays have higher frequencies than gamma rays

Dx-rays arise from energy changes in the electronic structure of atoms while gamma rays come from the nucleus

View Explanation & Discuss

Question 69

jamb 2004

Given three capacitors 0.3μF, 0.5μF and 0.2μF, the joint capacitance when arranged to give minimum capacitance is

A0.1μF

B0.3μF

C1.0μF

D0.5μF

View Explanation & Discuss

Question 70

jamb 2004

Electrical appliances at home are normally earthed so that?

Athe appliances are maintained at a lower p.d than the earth

Bboth the a.c and d.c sources can be used

Ca person touching the appliances is safe from electric shock

Dthe appliances are maintained at a higher p.d than the earth

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Question 71

jamb 2004

If 16mA of current flows through a conductor in one second, the number of electron transported per seconds is
[1 electronic charge = 1.6 x 10^-19C]

A1.00 x 10²⁰

B2.56 x 10^-18

C2.56 x ^-17

D1.00 x 10¹⁷

View Explanation & Discuss

Question 72

jamb 2004

The instrument used for securing a large number of similar charges by induction is called

Aelectrophorus

Bcapacitor

Cproof-plane

Delectroscope

View Explanation & Discuss

Question 73

jamb 2004

A steady current of 2A flows in a coil of emf 12V for 0.4s. A back emf of 3V was induced during this period. The stored energy in the loop that can be utilized is

A9.6J

B2.4J

C12.0J

D7.2J

View Explanation & Discuss

Question 74

jamb 2004

Which of the following is an electrolyte?

AParaffin

BSugar solution

CGrape fruit

DAlcohol

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Question 75

jamb 2004

The energy stored in an inductor of inductance 5mH when a current of 6A flows through it is

A9.0 x 10^-3J

B9.0 x 10^-2J

C1.4 x 10^-2J

D1.8 x 10^-3J

View Explanation & Discuss

Question 76

jamb 2004

Flourescent tubes produces light by the

Aexcitation of gas molecules

Bconduction of solar energy

Crefraction of light by gas molecules

Dthermal agitation of electron in the tubes

View Explanation & Discuss

Question 77

jamb 2004

The binding energy of helium \(^4 _2\) He is [atomic mass of proton = 1.00783U, atomic mass of neutron = 1.00867U]

A4.033U

B2.017U

C0.033U

D0.330U

View Explanation & Discuss

Question 78

jamb 2004

In a tuned radio receiver R, L, C series circuit for resonance, the inductive and capacitive reactance X_L and X_C respectively are related as

AX_L = X_C

BX_L = ¹/₂X_C

CX_L = ¹/_{X_C}

DX_L = 2X_C

View Explanation & Discuss

Question 79

jamb 2004

In a reverse biased junction diode, current flows in by

Apositive holes alone

Bmajority carriers

Celectron alone

Dminority carriers

View Explanation & Discuss

Question 80

jamb 2004

The particle and wave nature of matter are demonstrated in the equation

Aλ = ^hc/_E

Bλ = ^h/_P

Cλ = ^c/_f

Dλ = 2 d sin θ

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