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Physics Past Questions

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49 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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49 questions

Question 1 of 20 49 total questions

Question 11

jamb 2008

An electric generator has e.m.f. of 240 V and an internal resistance of 1Ω if the current supplied by the generator is 20A when the terminal voltage is 220 V, find the ratio of the power supplied to the power dissipated?

A11:1

B1:11

C12:11

D11:12

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Question 12

jamb 2008

A short chain is sometimes attached to the back of a petrol tanker to?

Agenerate more friction

Bensure the balancing of the tanker

Ccaution the driver when overspeeding

Dconduct excess charges to the earth

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Question 13

jamb 2008

Short sightedness can be corrected by what type of lens?

AConcave lens

BConvex lens

CConverging lens

DMirrors

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Question 14

jamb 2008

In the microscope, the eyepiece lens merely acts as?

Aan inverter

Ba refiner

Ca diminisher

Da magnifier

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Question 15

jamb 2008

An object placed at the bottom of a well full of clear water appears closer to the surface due to?

Adiffraction

Breflection

Crefraction

Dpolarization

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Question 16

jamb 2008

Convex mirror are used as driving mirrors because images formed are?

Aerect, virtual and diminished

Berect, real and diminished

Cerect, virtual and magnified

Dinverted virtual and diminished

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Question 17

jamb 2008

An object of heights 5 cm is placed at 20 cm from a concave mirror of focal length 10 cm. the image height is?

A20 cm

B15 cm

C10 cm

D5 cm

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Question 18

jamb 2008

An object of height 4cm is placed in front of a cuboid pinhole camera of size 6 cm. if the image formed is 2 cm high, how far is the object from the pinhole?

A3.0 cm

B8.0 cm

C12.0 cm

D16.0 cm

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Question 19

jamb 2008

I. Total internal reflection of light.
II. Conservation of light energy.
III. Relative motion of the earth, sun and moon.
IV. Rectilinear propagation of light.
which of the above is a phenomenon of total solar eclipse?

AI and IV only

BII and IV only

CI and III only

DIII and IV only

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Question 20

jamb 2008

The fundamental property of a propagating wave which depends only on the source and not the medium of propagation is the?

Awavelength

Bharmonics

Cfrequency

Dvelocity

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Question 21

jamb 2008

Given the progressive wave equation y = 5 sin (2000 πt - 0.4x), calculate wave length

A12.4 m

B15.7 m

C17.5 m

D18.6 m

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Question 22

jamb 2008

In a good thermos flask, heat loss is reduced through the following features EXCEPT?

Athe lens surface

Bthe insulating cork

Csilvered walls

Dthe cork lid

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Question 23

jamb 2008

If the partial pressure of water vapour at 27°C is 18 mm Hg and the saturated vapour pressure of the atmosphere at the same temperature is 24 mm Hg, the relative humidity at this temperature is?

A25%

B33%

C75%

D82%

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Question 24

jamb 2008

A block of aluminum is heated electrically by a 25 W heater. if the temperature rises by 10°C in 5 minutes, the heat capacity of the aluminum is?

A850 JK^-1

B750 JK^-1

C650 JK^-1

D500 JK^-1

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Question 25

jamb 2008

A sealed flask contains 600cm3 of air at 27°C and is heated to 35°C at constant pressure. The new volume is?

A508 cm³

B516 cm³

C608 cm³

D616 cm³

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Question 26

jamb 2008

During summer, the balance wheel of a clock expands.what effect does this have on the accuracy of the clock?

Athe clock gians time

Bthe accuracy of the clock is not affected

Cthe clock losses time

Dthe clock stops working

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Question 27

jamb 2008

The thermometric properties of a thermocouple is the change in?

Aequivalent resistance

Belectromotive force

Ccolour

Dpressure

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Question 28

jamb 2008

An empty density bottle weighs 2 N. if it weighs 5 N when filled with water and 4 N when filled with olive oil, the relative density of olive oil is?

A(1)/3

B(2)/3

C(1)/5

D(2)/5

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Question 29

jamb 2008

When cold water is poured on a can containing hot water, the can collapses because the?

Asteam condeses and occupies the partial vacuum in the can

Bexternal air pressure counter balances the pressure within the can

Csteam expands to occupy the vacuum remaining in the can

Dexternal pressure becomes greater than the pressure within the can.

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Question 30

jamb 2008

In the hare's apparatus, water rises to a height of 26.5 cm in one limb. if a liquid rises to a height of 20.4 cm in the other limb, what is the relative density of the liquid?

A0.8

B1.1

C1.2

D1.3

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