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Past Questions

49 questions

Question 1 of 20 49 total questions

Question 1

jamb 1985

In the Fig above, MN is a light uniform meter rule pivoted at O, the 80cm mark. A load of mass 3.00kg is suspended on the meter rule at L, the 10cm mark. If the rule is kept in equilibrium by a string RP, fixed at P and attached to the rule at R, the 20cm mark, then the Tension T on the string is?

A3.0N

B3.4N

C3.5N

D6.0N

E7.0N

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Question 2

jamb 1985

The graph in the fig above describes the motion of a particle. the acceleration of the particle during the motion is

A0.00ms^-2

B0.25ms^-2

C4.00ms^-2

D8.00ms^-2

E10.00ms^-2

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Question 3

jamb 1985

In the Fig above, Current I passes through the combination, if the power dissipated in the 5 ohm resistor is 40W, then the power dissipated in the 10 ohm resistor is

A10W

B20W

C40W

D80W

E100W

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Question 4

jamb 1985

Normal atmospheric pressure at sea-level is 10⁵Nm^-2 and the acceleration due to gravity is approximately 10ms^-1. If the atmosphere has a uniform density of 1kgm^-3, its height is

A100m

B1000m

C10 000m

D100 000m

E1000 000m

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Question 5

jamb 1985

What is the number of neutrons in the Uranium isotope \(^{238}_{92}X\)?

A92

B146

C238

D330

E119

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Question 6

jamb 1985

Which of the following features is NOT a characteristic of natural radioactivity?

ARadioactivity is a nuclear phenomenon

BRadioactivity is exhibited only by elements of mass number greater than 206

CThe radioactivity of an element is affected by electric and magnetic fields in the surroundings

DRadioactive substances emits three types of radiations, a-rays, \(\beta\)-rays and y-rays

EThe radioactive element is transformed into a new element

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Question 7

jamb 1985

Which of the following statements about electrolysis is NOT correct?

AThe substances in solution in the electrolyte become ionized

BIons are electrically charged and are attracted towards electrodes when a potential difference is applied

CIons may be discharged at the electrodes, forming bubbles or deposits

DThe mass deposited depends upon the length of time for which current flows

EThe mass of gas set free or metal deposited is proportional to the square of the current

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Question 8

jamb 1985

A transformer has a primary coil with 500 turns and a secondary coil with 2500 turns. When the voltage input to the primary coil is 120V, the output is

A6000V

B600V

C240V

D60V

E24V

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Question 9

jamb 1985

Which of the following statements is NOT correct?

AA galvanometer can be converted to an ammeter with a different range by connecting a high resistance in series

BAn electric current always produces a magnetic field

CMaxwell's screw rule states that if a corkscrew moves inthe direction of the current, the hand turns in the direction of the lines of force

DElectromagnets are used in electric bells and telephone recievers

EThe lines of force round a straight current carrying conductor are circular

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Question 10

jamb 1985

On which of the following does the operation of a moving coil ammeter depend? i. Electromagnetic induction ii. Force on a carrying-current conductor iii. Magnetic effect of an electric current

Ai only

Bii only

Ciii only

Dii and iii only

Ei,ii and iii

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Question 11

jamb 1985

An electric kettle, connected to a 240V mains, produces 6.0 x 10⁵J of heat energy to boil a quantity of water in 5 minutes. Find the resistance of the kettle.

A14.4\(\Omega\)

B28.8\(\Omega\)

C144\(\Omega\)

D288\(\Omega\)

E2880\(\Omega\)

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Question 12

jamb 1985

A wire P has half the diameter and half the length of a wire Q of similar material. The ratio of the resistance of P to that of Q is

A8 : 1

B4 : 1

C2 : 1

D1 : 1

E1 : 4

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Question 13

jamb 1985

Which of the following will convert a milliammeter to a voltmeter?

Alow series resistance

Blow parallel resistance

Chigh series resistance

Dhigh parallel resistance

Eparallel resistance equal to milliammeter resistance

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Question 14

jamb 1985

A cell gives a current of 0.15A through a resistance of 8\(\Omega\) and 0.3A. When the resistance is changed to 3\(\Omega\) the internal resistance of the cell is

A0.05\(\Omega\)

B1.00\(\Omega\)

C1.50\(\Omega\)

D2.00\(\Omega\)

E2.50\(\Omega\)

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Question 15

jamb 1985

Which of the following methods CANNOT be used to produce a steel magnet? The

Apassing of an electric current through a solenoid

Brepeated stroking of the specimen with a magnet

Crepeated stroking of the specimen in opposite directions with magnets

Dheating of the specimen

Ehammering of the specimen in the earth's magnetic field

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Question 16

jamb 1985

If the distance between two stationary charged particle is doubled, the magnitude of the electro-static force between them will be

Adoubled

Bhalved

Ca quarter of its former value

Dunchanged

Efour times the original value

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Question 17

jamb 1985

A charge of one coulomb liberates 0.0033g of copper in an electrolytic process. How long will it take a current of 2A to librate 1.98g of copper in such a process?

A5 mins

B30 mins

C50 mins

D60 mins

E120 mins

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Question 18

jamb 1985

A narrow beam of white light can be split up into different colours by a glass prism. The correct explanation is that

Awhite light is an electromagnetic wave

Bthe prism has all the colours of the white light

Cwhite light has undergone total internal reflection in the prism

Ddifferent colours of white light travel with different speeds in glass

Ewhite ligth consist of yellow, green and red colours

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Question 19

jamb 1985

Two rays of light from a point below the surface of water are equally inclined to each other at 60^o in water. What is the angle between the rays when they emerge into air? (Take the refractive index of water to be \(\frac{4}{3}\))

A41.8^o

B44.1^o

C60.0^o

D83.6^o

E120.0^o

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Question 20

jamb 1985

A convex mirror is used as a driving mirror because i. its image is erect. ii. it has a large field of view. iii. it has a long focal length. Identify the CORRECT statement(s)

Ai andiii only

Bi and ii only

Cii and iii only

Di, ii, and iii only

Ei only

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