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98 questions

Question 1 of 20 98 total questions

Question 31

jamb 2007

A particle of weight 120N is placed on a plane inclined at 300 to the horizontal. If the plane has an efficiency of 60% to the floor what is the force required to push the weight uniformly up the plane?

A50N

B100N

C175N

D210N

View Explanation & Discuss

Question 32

jamb 2007

118.8cm2 surface of the copper cathode of a voltameter is to be coated with 10-6m thick copper of density 9 x 103kgm-3. How long will the process run with 10A constant current?
[3.3 x 10-7kgC-1]

A5.4 min

B10.8 min

C15.0 min

D20.0 min

View Explanation & Discuss

Question 33

jamb 2007

from the diagram above, the inductive reactance and the resistance R are respectively

A50Ω and 45Ω

B25Ω and 51Ω

C20Ω and 50Ω

D10Ω and 50Ω

View Explanation & Discuss

Question 34

jamb 2007

During the nuclear reaction described by

\(^{235}_{92}\)W → \(^{235}_{93}\)X → \(^{231}_{91}\)Y

The particles emitted are respectively

Aα and α

Bα and β

Cβ and β

Dβ and α

View Explanation & Discuss

Question 35

jamb 2007

The instantaneous value of the induced e.m.f as a function of time is ε = ε_o sin ωt where ε_o is the peak value of the e.m.f. The instantaneous value of the e.m.f., one quarter of the period is

A0.00

B^ε_o/₄

C^ε_o/₂

Dε_o

View Explanation & Discuss

Question 36

jamb 2007

In the diagram above , if the magnetic field points into the paper and the force on a current - carrying conductor points upwards, what is the direction of the current?

AUpwards

BDownwards

CRight

DLeft

View Explanation & Discuss

Question 37

jamb 2007

Three cells each of e.m.f 1.5 V and internal resistance 2.5Ω are connected as shown in the diagram above. Find the net e.m.f and the internal resistance

A1.5V, 7.50Ω

B1,5V, 0.83Ω

C4.5V, 7.50Ω

D4.5V, 0.83Ω

View Explanation & Discuss

Question 38

jamb 2007

The fundamental frequency of a plucked wire under a tension of 400N is 250Hz. When the frequency is changed to 500 Hz at constant length, the tension is

A1600N

B400N

C160N

D40N

View Explanation & Discuss

Question 39

jamb 2007

The ratio of the coefficient of linear expansion of two metals \(\frac{∝_1}{∝_2}\) is 3:4. If, when heated through the same temperature change, the ratio of the increase in length of the two metals, \(\frac{e_1}{e_2}\) is 1:2, the ratio of the original lengths \(\frac{l_1}{l_2}\) is

A⁸/₃

B³/₂

C²/₃

D³/₈

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Question 40

jamb 2007

A blacksmith heated a metal whose cubic expansivity is 6.3 x 10\(^{-6}\)K\(^{-1}\). The area expansivity is

A2.0 x 10^-6K^-1

B2.1 x 10^-6K^-1

C4.2 x 10^-6K^-1

D6.3 x 10^-6K^-1

View Explanation & Discuss

Question 41

jamb 2007

A boy drags a bag of rice along a smooth horizontal floor with a force of 2N applied at the angle of 60^o to the floor. The work done after a distance of 3m is

A3 J

B4 J

C5 J

D6 J

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Question 42

jamb 2007

In the diagram above, a rod 50 cm long of uniform cross-section is suspended horizontally on a fulcrum, F, by the action of two forces. What is the weight of the rod?

A40N

B80N

C120N

D200N

View Explanation & Discuss

Question 43

jamb 2007

From the diagram above, the bob of the pendulum has the fastest speed at

View Explanation & Discuss

Question 44

jamb 2007

The figure above shows 4 forces 3N, 10N, 3√3N and 6N acting on a particle P. The resultant of he four forces is

A5N

B5√ 3N

C10N

D10√ 3N

View Explanation & Discuss

Question 45

jamb 2007

Silicon doped with aluminum and germanium doped with arsenic become?

Ap- and n- types respectively

Bn- en p- type respectively

Cp- type semiconductor

Dn- type semiconductors

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Question 46

jamb 2007

The bond that forms a semiconductor is?

Acovalent

Belectrovalent

Cionic

Dmetallic

View Explanation & Discuss

Question 47

jamb 2007

The energy E of a photon and its wavelength are related by Eλ = X. the numerical value of X is?
[h = 6.63 x 10\(^{-34}\)js, c = 3 x 10\(^8\) ms\(^{-1}\)]

A6.6 X 10^-28

B1.99 X 10^-27

C6.60 x 10^-26

D1.99 x 10^-25

View Explanation & Discuss

Question 48

jamb 2007

A charge 50 µc has electric field strength of 360 NC-1 at a certain point. The electric field strength due to another charge 120 µc kept at the same distance apart and in the same medium is?

A864 NC^-1

B150 NC^-1

C144 NC^-1

D18 NC^-1

View Explanation & Discuss

Question 49

jamb 2007

The production of pure spectrum could easily be achieved using a?

Aglass prism with a pin

Btriangular prism with two convex lens

Ctraingular prism only

Dtriangular prism with two concave lenses

View Explanation & Discuss

Question 50

jamb 2007

When an object is placed between the principal focus and the optical center of a convex lens, it could be used as a?

ASimple microscope

Brefecting lens

Ccompound microscope

Dprojector

View Explanation & Discuss

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