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48 questions

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Question 21

jamb 1979

In what range of temperature is the expansion of water anomalous?

A+208^oC to +212^oC

B-80^oC + -76^oC

C-4^oC to 0^oC

D+96^oC to +100^oC

E0^oC to +4^oC

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Question 22

jamb 1979

If in a simple pendulum experiment the length of the inextensible string is increased by a factor of four, its period is increased by a factor of

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

C\(\frac{1}{4}\)

D2\(\pi\)

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Question 23

jamb 1979

Which of the following types of waves cannot travel through a vacuum?

Asound waves

Blight waves

Cinfra-red waves

Dx-radiation

Eradio waves

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Question 24

jamb 1979

The temperature at which the water vapour present in the air saturates the air and begins to condense is known as

Aboiling point

Bmelting point

Ctriple point

Ddew point

Ecritical temperature

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Question 25

jamb 1979

Two closed vessels contain equal volumes of boiling water and are identical except that one is blackened on the outside while the other is polished. Which of the following is correct?

Athe polished vessel will cool faster because a polished surface is a good radiator

Bthe polished vessel will cool faster because it will absorbe less heat from the room

Cthe black vessel will cool faster because it is a better conductor of heat

Dthe polished vesselwill cool faster because it reflects heat better

Ethe black vessel will cool faster because a black surface radiates heat faster than a polished one

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Question 26

jamb 1979

A 500kg car which was initially at rest travelled with an acceleration of 5m sec^-2, its kinetic energy after 4 seconds was

A10⁵J

B2.5 x 10³J

C2 x 10³J

D5 x 10³J

E5 x 10^5J`

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Question 27

jamb 1979

Which of the following statements defines correctly the efficiency of a machine?

Athe load carried by the machine divided by effort required in carrying the load

Bthe distance moved by the load divided by the distance moved by the effort

Cthe useful work done by the machine divided by the total work put into the machine

Dthe movement of the load divided by the movement of the effort about the same point

Ethe temperature at the end of the application of the machine divided by the initial temperature

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Question 28

jamb 1979

The density 400cm³ of palm oil was 0.9gcm^-3 before frying. If the density of the oil was 0.6gm^-3 after frying,assuming no loss of oil due to spilling, its new volume was

A360cm³

B600cm³

C240cm³

D800cm³

E450cm³

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