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2,483 questions

Question 1 of 20 2,483 total questions

Question 1151

jamb 1981

The relationship between the period T and the length l of a simple pendulum is T = 2\( \pi \) \( ( \frac{I}{g}) ^{ \frac{1}{2} } \). From experiment data of T and I, one can obtain the following graphs, i. T vs.I ii. T vs I2 iii. T2 vs. I iv. T vs \( \sqrt{I} \) v. logT vs logI. Which of the following graphs, are linear?

Aall

Bonly i and ii

Conly iii and iv

Diii, iv and v

Enone of them

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Question 1152

jamb 1981

Which of the following is NOT directly associated with direct current (DC)?

AA dry cell

Ba moving coil galvanometer

Ca transformer

Da lead- acid accumulator

Ea commutator

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Question 1153

jamb 1981

The extension in a spring when 5g wt was hung from it was 0.56cm. If Hooke's law is obeyed, What is the extension caused by a load of 20g wt?

A1.12m

B2.14cm

C2.52cm

D2.80cm

E2.24cm

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Question 1154

jamb 1981

A liquid-in-glass thermometer should quickly register temperature changes. This is achieved by choosing a liquid that

Ais opaque

Bhas high density

Chas regular expansion

Dhas a high thermal conductivity

Ecan wet glass

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Question 1155

jamb 1981

An object placed on the principle axis of a convex lens of focal length 10m produces a real image of double magnification. The image distance from the lens is

A30cm

B25cm

C20cm

D15cm

E10cm

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Question 1156

jamb 1981

The mass of a proton is approximately equal to that of

Aan \(\alpha\)-particle

Ba \(\beta\)-particle

C\(\gamma\)-ray

Dan electron

Ea neutron

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Question 1157

jamb 1981

The quantity (timbre) of sound depends on

Aamplitude

Bfrequency

Charmonics

Dvelocity

Ewavelength

View Explanation & Discuss

Question 1158

jamb 1981

Change of state is accompanied by change of?

Atemperature

Bvolume

Cheat content

Dtemperature and volume

Evolume and heat content

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Question 1159

jamb 1981

a balloon inflated with helium gas at ground level is released. As it rises through a constant temperature atmosphere.

Aits pressuren reduces but volume remains constant

Bte product of pressure and volume remains constant

Cboth pressure and volume increases

Dits pressure remains constant but the volume decreases

Eboth pressure and volume remains constant

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Question 1160

jamb 1981

Two particles X and Y starting from rest cover the same distance. The acceleration of X is twice that of Y. the ratio of the time taken by X to that taken by Y is

A\(\frac{1}{2}\)

B\(\frac{2}{\sqrt2}\)

C\(\frac{1}{\sqrt2}\)

D\(\sqrt 2\)

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Question 1161

jamb 1981

Alternating current can induce voltage because it has a

Aripple value

Bvarying magnetic field

Cweaker magnetic field than direct current

Dstonger magnetic field than direct current

Ehigh peak value

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Question 1162

jamb 1981

A body falls freely under gravity (g = 9.8ms-2) from a height of 40m on to the top of a platform 0.8m above the ground. Its velocity on reaching the platform is

A784ms^-1

B80ms^-1

C78.4ms^-1

D39.2ms^-1

E27.7ms^-1

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Question 1163

jamb 1981

The lack of power of accommodation which is mainly due to the hardening of the eye lens and is usual with onset of old age is called?

Amyopia

Bhypermyopia

Cpresbyopia

Dastigmatism

Eeye ring

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Question 1164

jamb 1981

The resistance of an open series circuit is

Azero

Bhalf the normal resistance of the circuit

Cdouble the normal resistance of the circuit

Done

Einfinite

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Question 1165

jamb 1981

Which type of radiation does not NOT originate within the nucleus?

Aalpha

Bbeta

Cgamma

Dneutron

Ex-rays

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Question 1166

jamb 1981

Which of the following statements is CORRECT?

Acharges generated on glass rubbed with silk are called negative

Bcharges in various media can be carried by protons detached from their atom

Cthe magnitude of any charge is a multiple of the charge of an electron

Dthe intensity of an electric field is a scalar quantity

Eif 500 joules of work are required to move a 2-coulomb charge between two points, the potential difference between the two point is 100V

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Question 1167

jamb 1981

The absolute refractive indices of glass and water are \(\frac{3}{2}\) and \(\frac{4}{3}\) respectively. The refractive index at the interface when a ray travels from water to glass is

A\(\frac{1}{2}\)

B\(\frac{8}{9}\)

C\(\frac{9}{8}\)

D\(\frac{17}{12}\)

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Question 1168

jamb 1981

The driver in a motor car, of which the total mass is 800kg and which is traveling at 20ms-1, suddenly observes a stationary dog in his path 50m ahead. If the car brakes can exert a force of 2000N, what will most likely happen?

Athe car will be able to stop immediately the driver notices the dog

Bthe car will stop 30m after hitting the dog

Cthe car will stop 20m in front of the dog

Dthe driver will quickly reverse the car

Ethe car will stop 5m beyound the dog

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Question 1169

jamb 1981

All of the following frequencies are overtones of 320 Hz EXCEPT

A960Hz

B640Hz

C520Hz

D1280Hz

E1600Hz

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Question 1170

jamb 1981

An aircraft travelled from calabar to kano as follows: it flew first to ilorin convering a distance of 300km, 30^o west of North, and then flew 400km, 60^o East of North to kano. What is the resultant displacement?

A567km

B410km

C594km

D500km

E600km

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