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4,719 questions

Question 1 of 20 4,719 total questions

Question 2221

jamb 1983

Each of the diagrams in Fig 6 represents two current-carrying conductors situated close to each other. In which two diagrams are the forces between the two wires attractive?

AI and V

BI and III

CII and IV

DII and V

EIII and IV

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Question 2222

jamb 1983

In the Figure above, QR is a vertical conductor and the current I flows from R to Q, P is a point on the horizontal plane and is to the south of the wire. The direction of the magnetic field at P due to the current is

AUpward

BNorth

CSouth

DWest

EEast

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Question 2223

jamb 1983

Four resistors R\(_1\),R\(_2\),R\(_3\), and R\(_4\) are connected in series as shown above, V\(_1\),V\(_2\),V\(_3\) are voltmeters connected as indicated above. Which of the following relations is correct??

AV1 = V3 =V2/2

BV1 = 2V2 = V3

CV1=1/2V3 =V3

DV2 - V1 = V3

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Question 2224

jamb 1983

the image above shows an inverted U-tube with the open end, O of one limb below the level, W of water in the tank, in order that water should begin to flow from the tank it is is necessary that

AThe U-tube is completely filled with water and that P should be higher that W

BP should be lower than O and W

CP should be lower than W and O should reach the botton of the table

DThe U-tube is completely filled with water and that P should be lower that W

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Question 2225

jamb 1983

PQ is a thin rod on a horizontal table, RS is a plane mirror inclined at \( 45^{\circ}C\) to the horizontal as shown above. The image of PQ as seen in the mirror by the eye T is

Ahorizontal

Bparallel to the mirror

Cat infinity

Dvertical

Ehighly magnified

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Question 2226

jamb 1983

Which of the following may be used to determine the relative humidity in a physics laboratory

I. Manometer
II. Wet-and-Dry Bulb Hygrometer
III. Hair Hygrometer
IV. A Hydrometer

AI Only

BII and III Only

CII Only

DIII Only

EII,IIIand IV Only

View Explanation & Discuss

Question 2227

jamb 1983

Longitudinal waves do not exhibit

ARefraction

BReflection

CDiffraction

DPolarization

ERarefaction

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Question 2228

jamb 1983

The specific latent heat of vaporization of a substance is always?

Aless than its specific latent heat of fusion

Bgreater than its specific heat of fusion

Cequal to its specific latent heat of fusion

Dall of the above depending on the nature of the substance

Enone of the above

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Question 2229

jamb 1983

If the force of a charge of 0.2 coulomb in an electric field is 4N, then the electric field intensity of the field is

A0.8

B0.8N/C

C20.0N/C

D4.2N/C

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Question 2230

jamb 1983

the speed of light in vacuum is 3.0 x 10⁸ms^-1. If the refractive index of a transparent liquid is \(\frac{4}{3}\), then the speed of light in the liquid is

A0.44 x 10 ⁸ms^-1

B2.25 x 10 ⁸ms^-1

C3.0 x 10 ⁸ms^-1

D4.0 x 10 ⁸ms^-1

E4.33 x 10 ⁸ms^-1

View Explanation & Discuss

Question 2231

jamb 1983

Which of the following best describes the energy changes which take place when a steam engine drives a generator which lights a lamp?

Aheat \( \to \) light \( \to \) sound \( \to \) kinetic

Bkinetic \( \to \) light \( \to \) heat \( \to \) electricity

Cheat \( \to \) kinetic\( \to \) electricity \( \to \) heat \( \to \) light

Delectricity \( \to \) kinetic \( \to \) heat v light

Eheat \(\ to \) sound \( \to \) kninetic v electricity

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Question 2232

jamb 1983

The difference of potential between the terminals of cells is 2.2 volts. When a 4ohm resistor is connected across the terminals of this cells, the potential difference is 2 volts. What is the internal resistance of the cell?

A0.10 ohms

B0.25ohms

C0.40ohms

D2.50ohms

E4.00ohms

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Question 2233

jamb 1983

An electric current of 3Aflowing through an electric heating elements of resistance 20 embedded in 1,000g of an oil raises the temperature of the oil by 10oC in 10 seconds then the specific heat capacity of the oil is

A1.8Jg^-1^oC

B0.6Jg^-1^oC

C0.18Jg^-1^oC

D18Jg^-1^oC

E0.06Jg^-1^oC

View Explanation & Discuss

Question 2234

jamb 1983

If the normal atmospheric pressure in a laboratory supports a column of mercury 0.76m high and the relative density of mercury is 13.8, then the height of water column which atmospheric pressure will support in the same laboratory at the same time is

A0m

B10m

C13m

D14m

E18m

View Explanation & Discuss

Question 2235

jamb 1983

A machine has a velocity ratio of 5. It requires a 50kg weight to overcome a 200kg weight. The efficiency is

A4%

B5%

C40%

D50%

E80%

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Question 2236

jamb 1983

A short response to time is obtained in liquid-in-glass thermometer when the

Abulb is large and thick-walled

Bstem is long and thin

Cbulb is small and thicked-walled

Dliquid is of high density and the bore is large

Ebulb is thin-walled and the liquid is a good conductor of heat

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Question 2237

jamb 1983

Which of the following statements is CORRECT? i. the mass number is equal to the total number of protons and electrons in an atom. ii. the atomic number is equal to the number of protons in an atom. iii. the number of electrons in an atom is equal to the total number of protons and neutrons in the nucleus.

Ai only

Bii only

Ciii only

Di and ii only

Eii and iii only

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Question 2238

jamb 1983

The total length of a spring when a mass of 20g is hung from its end is 14cm, while its total length is 16cm when a mass of 30g is hung from the same end. Calculate the unstretched length of the spring assuming Hooke's law is obeyed.

A9.33cm

B10.00cm

C10.66cm

D12.00cm

E15.00cm

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Question 2239

jamb 1983

1,000 identical drops of oil of density 500kgm-3 have a total mass of 5 x 10-4kg. One of the drops forms a thin film of area 0.5m2 on water. The thickness of the film is

A2 x 10^-8m

B2 x 10^-9m

C2 x 10^-7m

D3 x 10^-9m

E2.8 x 10^-8m

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Question 2240

jamb 1983

a force of 16N applied 4.0kg block that is at rest on a smooth, horizontal surface. What is the velocity of the block at t = 5 seconds?

A4ms^-1

B10ms^-1

C20ms^-1

D50ms^-1

E80ms^-1

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