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98 questions

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Question 31

jamb 2011

If the threshold frequency for tungsten is 1.3 x 10¹⁵Hz, what is its work function?

[H = 6.6 x 10^-34 Js]

A8.58 x 10^-19 J

B8.50 x 10^-15 J

C8.58 x 10^-17 J

D8.85 x 10^-18

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Question 32

jamb 2011

The electrical properties of germanium can be altered drastically by the addition of impurity. This process is referred to as

Asaturation

Bbonding

Camplification

Ddopping

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Question 33

jamb 2011

A radioactive isotope has a decay constant of 10-5s4. Calculate half life

A6.93 x 10^-5s

B6.93 x 10⁵s

C6.93 x10⁴s

D6.93 x 10^-4s

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Question 34

jamb 2011

The bond between silicon and germanium is

Acovalent

Bionic

Cdative

Delectrovalent

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Question 35

jamb 2011

Which of the following materials has an increase in resistance with temperature?

Awater

Bmetals

Cwood

Delectrolyte

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Question 36

jamb 2011

Two inductors of inductance 4 II and 8 II are arrange in series and a current of 10 A is passed through them. What is the energy stored in them?

A600 J

B50 J

C133 J

D250 J

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Question 37

jamb 2011

Under which of the following conditions do gases conduct electricity?

ALow presssure and low p.d

Blow pressure and high p.d

Chigh pressure an low p.d

Dhigh pressure and high p.d

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Question 38

jamb 2011

If the charge of electricity is K wh is N4, what is the cost of operating an electrical appliance rated 250 v,2 A for six hours?

AN28

BN12

CN16

DN24

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Question 39

jamb 2011

In measuring high frequency a.c, the instrument used is the

Ad.c ammeter

Bmoving coil ammeter

Cmoving iron ammeter

Dhot wire ammeter

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Question 40

jamb 2011

Which of the following is a property of steel?

Ait cannot retain its magnetism longer than iron

Bit can be used for making temporary magnets

Cit can be used for making permanent magnets

Dit can easily be magnetized and demagnetized

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Question 41

jamb 2011

The eclipse of the sun occurs when the

Amoon is between the sun and the earth

Bearth is between the sun and the moon

Cmoon is not completely hidden in the earth's shadow

Dmoon's umbra falls on some part of the earth

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Question 42

jamb 2011

A certain far - sighted person cannot see object that are closer to the eye than 50 cm clearly. Determine the power of the converging lens which will enable him to see at 25 cm

A0.06 D

B0.02 D

C0.03 D

D0.04 D

Eno option is correct

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Question 43

jamb 2011

The capacitance of a parallel plate capacitor is 20 μf in air and 60 μf in the presence of a dielectric. What is the dielectric constant?

A0.3

B6.0

C3.0

D2.0

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Question 44

jamb 2011

When a red rose flower is observed in blue light, what colour does the observer see?

ARed

BBlue

CMagenta

Dyellow

ENo correct option

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Question 45

jamb 2011

When the human eye loses its power of accomodation, the defect is known as

Ashort sightedness

Bpresbyopia

Castigmatism

Dlong sightedness

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Question 46

jamb 2011

Three similar cells each of e.m.f 2 v and internal resistance 2Ω are connected in parallel, the total e.m.f and total internal resistance are respectively

A6 v, 6.0Ω

B2 v, 0.7Ω

C2 v, 6.0Ω

D6 v, 0.7Ω

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Question 47

jamb 2011

I. change of state
II. Diffusion
III. Radiation
IV. Osmosis
which of the processes above can be explained using the kinetic theory?

AI, II,III and IV

BI, II and III

CI, III and IV

DI, II and IV

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Question 48

jamb 2011

Steam burn is more severe than that of boiling water because

Asteam burn is independent of relative humidity

Bsteam possesses greater heat energy per unit mass

Cwater boils at a higher temperature

Dsteam burn is dependent on relative humidity

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Question 49

jamb 2011

A block of aluminum is heated electrically by a 30 w heater if the temperature rises by 10°c in 5 minutes, the heat capacity of the aluminum is

A900 JK^-1

B90 JK^-1

C100 JK^-1

D200 JK^-1

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Question 50

jamb 2011

The phenomenon that shows that increase in pressure lowers the melting point can be observed in

Asublimation

Bcondensation

Ccoagulation

Dregelation

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