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Past Questions

49 questions

Question 1 of 20 49 total questions

Question 11

jamb 1978

A potential difference of 6v is used to produce a current of 5A for 200s through a heating coil. The heat produced is

A4800 cal

B6000 cal

C2400J

D240k cal

E6000J

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Question 12

jamb 1978

Why is it impossible for the lines of force of an electric field to cross one another?

Alike charges repel each other

Ba charged particle is deflected by an eletric field

Clike charges are arranged on the same line of force

Da positively charged particle can travel in only one direction at any time

Enone of these is correct

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Question 13

jamb 1978

On an a.c generator, which of the following does not apply?

Afield magnet

Bcommutator

Carmature

Dslip rings

Ecarbon brushes

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Question 14

jamb 1978

In a D.C. circuit, a 10 microfarad (mf) capacitor is placed in series with a 10 0hm resistor. The total resistance of the combination is

A10 ohms

B1 ohms

Czero

D20 ohms

Einfinite

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Question 15

jamb 1978

In order to convert a galvanometer into an ammeter

Aa low resistance shunt is connected in parallel

Ba low resistance shunt is connected in series

Ca medium resistance shunt is connected in series

Da high resistance shunt is connected in parallel

Ea high resistance shunt is connected in series

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Question 16

jamb 1978

A magnet is moved through a coil of wire. The e.m.f. produced in the wire depends on

Athe number of turns in the coil

Bthe strength of the magnet

Cthe speed at which the magnet is moved

Dall of the above

Enone of the above

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Question 17

jamb 1978

If NEPA charges 5k per kWhr, what is the cost of operating for 24 hours a lamp required 1A on a 200v line?

A24k

B55k

C40k

D26k

E32k

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Question 18

jamb 1978

Three 5 ohms resistors connected in parallel have a potential difference of 60v. applied across the combination. The current in each resistor is

A4A

B36A

C12A

D24A

E10A

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Question 19

jamb 1978

Two resistors R1 and R2 are connected in parallel, R2 being greater than R1. The combined resistance is

Aless than R₁

Bgreater than R₂

Cthe sum of R₁ and R₂

Dthe difference of R₂ and R₁

Egreater thanR₁ but less than R₂

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Question 20

jamb 1978

The heat from the sun reaches the earth by the process

Ainsulation

Bprecipitation

Cconduction

Dconvection

Eradiation

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Question 21

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 22

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 23

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 24

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 25

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 26

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

View Explanation & Discuss

Question 27

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 28

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 29

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 30

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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