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4,719 questions

Question 1 of 19 4,719 total questions

Question 2351

jamb 1978

The following are some units i. Ns ii. Mm iii. Nm\(^-2\) iv. JKg\(^-1\). What are the units of latent heat?

Bii

Ciii

Div

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Question 2352

jamb 1978

A gas at pressure PNm\(^{-2}\) and temperature 27°C is heated to 77°C at constant volume. The new pressure is

A0.85 PN-m^-2

B0.86 PN-m^-2

C1.16 PN-m^-2

D1.18 PN-m^-2

E2.85 PN-m^-2

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Question 2353

jamb 1978

The latent heat of fusion of ice is 80cal g\(^{-1}\). How much heat is required to change 10g of ice at 0ºC into water at the same temperature?

A80 cal

B10 cal

C8 cal

D800 cal

E400 cal

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Question 2354

jamb 1978

A temperature 20°C is the same as

A36^oF

B68^oF

C11.1^oF

D43.1^oF

E25^oF

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Question 2355

jamb 1978

A few grains of table salt were put in a cup of water, kept at constant temperature and left undisturbed. Eventually all the water tasted salty. The action is due to

Aconvection

Bosmosis

Ccapillarity

Ddiffusion

Econductivity

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Question 2356

jamb 1978

The statements below were made by some students describing what happened during the determination of the melting point of solids.
i. the temperature of the solid was solid until melting started
ii. the temperature of the solid rose until melting started
iii. during melting, the temperature was rising
iv. during melting, the temperature was constant
v. the temperature continued to rise after all the solid had melted
vi. the temperature stopped rising after all the solid had melted. Which of the following gives correct statements in the right order?

Aii, iv, and v

Bii, iii and vi

Ci, iii and vi

Di, iii and v

Ei, iv and v

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Question 2357

jamb 1978

A solid suspended by a piece of string is completely immersed in water. On attempting to lift the solid out of the water, the string breaks when the solid is partly out of the water. This is because

Athe tension in the string decreases as the solid is lifted

Bthe mass of the solid has increased

Cthe solid apparently weighs less when completely immersed in water than when partially immersed

Dpart of the solid still in water is exerting more force on the string

Ethe solid is no longer in equilibrium with water

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Question 2358

jamb 1978

The density of a solid is defined as the

Amass of the solid compared to the mass of an equal volume of water

Bamount of water displaced when a unit mass of thesolid is immersed in it

Cweight per unit volume of the solid

Dvolume per unit mass of the solid

Emass per unit volume of the solid

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Question 2359

jamb 1978

The force required to make an object of mass m, travelling with velocity v, turn in a circle of radius r is

A\(\frac{mv^2}{r}\)

B\(\frac{mr^2}{v}\)

C\(\frac{mr}{v}\)

D\(\frac{mv}{r^2}\)

E\(\frac{mv}{r}\)

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Question 2360

jamb 1978

To determine the weight of an object you could

Ause a beam balance

Buse a spring balance

Cfind the force necessary

Duse none of these methods

Euse any of these methods

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Question 2361

jamb 1978

The internationally agreed system of units(SI) for physical measurements are

AIb, ft, sec

Bg, m, sec

Ckg, m, sec

Dcm, g, sec

Ekg, cm, sec

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Question 2362

jamb 1978

mercury is a better barometric fluid than water because i. it needs no colouring ii. its density is many times greater than that of water iii. it does not wet glass iv. it has a high vapour pressure v. it has a high boiling point. which of the above statements are true?

Ai and ii only

Bi, ii and iii only

Ciii and iv only

Div and v only

Eiii, iv and v only

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Question 2363

jamb 1978

A machine gun with a mass of 5kg fires a 50g bullet at speed of 100ms^-1. The recoil speed of the machine gun is

A0.5 msec^-1

B1.5 msec^-1

C1 msec^-1

D2 msec^-1

E4 msec^-1

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Question 2364

jamb 1978

An ice cube floats in a glass of water filled to the brim. What happens when the ice melts?

AThe water level remains the same

Bthere is a drop in the level of water in the glass due to condensation on its outside

Cthe water in the glass overflows

Dthe level of water drops because melted ice occupies less volume

Enone of the above is correct

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Question 2365

jamb 1978

A piece of rubber 10cm long stretches 6mm when a load of 100N is hung from it. What is the strain?

A60

C6 x 10^-2

D6 x 10^-3

E0.6

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Question 2366

jamb 1978

A palm fruit dropped to the ground from the top of a tree 45m tall. How long does it take to reach the ground? (g = 10ms^-2)

A9s

B4.5s

C6s

D7.5s

E3s

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Question 2367

jamb 1978

An air force jet flying with a speed of 335ms-1 went past an anti-aircraft gun. How far is the aircraft 5s later when the gun was fired?

A838m

B3350m

C670m

D1675m

E67m

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Question 2368

jamb 1978

The frictional force between two bodies?

Aexists only when there is relative motion or tendency for motion

Bacts so as to oppose the motion

Cdepends on the normal reaction between the two surfaces

Dis relatively independent of the area in contact

Ehas all of these characteristics

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Question 2369

jamb 1978

A man walks 1km due east and then 1km due north. His displacement is

A1 km N15^oE

B1 km N30^oE

C\(\sqrt 2\)km N 45^oE

D\(\sqrt 2\)km N 60^oE

E2km N 75^oE

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