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Past Questions

49 questions

Question 1 of 20 49 total questions

Question 1

jamb 2011

Two resistors 5Ω and 10Ω are arranged first in series and later in parallel to a 24V source, the ratio of total power dissipated in the series and parallel arrangements respectively is

A5:3

B1:50

C50:1

D3:5

ENo Correct Option

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Question 2

jamb 2011

In an A.C circuit, the ratio of r.m.s value to peak value of current is

B\( \frac{1}{2} \)

C\( \frac{1}{\sqrt{2}} \)

D\( \sqrt{2} \)

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Question 3

jamb 2011

In Homes, electrical appliances and lamps are connected in parallel because

AParallel connections do not heat up the wires

Bindependence switches can be used

Cless current will be used

Dless voltage will be used

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Question 4

jamb 2011

If the volume of a gas increases steadily as the temperature decreases at constant pressure, the gas obeys

AGraham's Law

BBoyle's Law

CPressure law

DCharles Law

ENo Correct Option

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Question 5

jamb 2011

In the circuit above, three resistors, 2Ω, 4Ω and 12Ω are connected in parallel and a 12V battery is connected across the combination. The current flowing through the 12Ω resistors is

A14.4 A

B1.0 A

C3.2 A

D9.6 A

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Question 6

jamb 2011

A length of wire has a frequency of 225Hz when stretched by a force of 225N. If the force increased to 324N, what is the new frequency of vibration?

A270 Hz

B512 Hz

C488 Hz

D356 Hz

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Question 7

jamb 2011

An image in a convex lens is upright and magnified 3 times. If the focal length of the lens is 15 cm, what is the object distance?

A10 cm

B25 cm

C16 cm

D14 cm

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Question 8

jamb 2011

The correct expression for the potential at a point distance r from a charge q in an electric field is?

_q²

4πε_or²

_q²

4πε_or

4πε_or²

D\(\frac{q}{4πε_or}\)

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Question 9

jamb 2011

The diagram above show the positions of a cone. The position which can be described as neutral equilibrium is represented as

AZ only

BX only

CY and Z

DY and X

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Question 10

jamb 2011

The diagram above shows two vectors at right angles to each other. The value of the resultant vector is

A14.0 N

B10.0 N

C12.0 N

D13.0 N

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Question 11

jamb 2011

Which of the following will be applied when a metal Y is used to electroplate another metal X in electrolysis?

AX is the anode and very high current is used

BX is the anode and Y is the cathode

CY is the cathode and X is the anode

DY is the anode and very high current is used

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Question 12

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 13

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 14

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 15

jamb 2011

The bond between silicon and germanium is

Acovalent

Bionic

Cdative

Delectrovalent

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Question 16

jamb 2011

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

Awater

Bmetals

Cwood

Delectrolyte

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Question 17

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 18

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 19

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 20

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

View Explanation & Discuss

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