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4,719 questions

Question 1 of 20 4,719 total questions

Question 2311

jamb 1980

Which of the following is true of an electrical charge?

Apositive charge means deficit electrons

Bnegative charge means excess of electrons

Celectric current means movement of electrons

Dall of the above

EA and B only

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Question 2312

jamb 1980

Which of the following statements are true of the law of universal gravitation?

Aany two bodies attract each other with a force which is proportional to the difference of their masses

Bany two bodies attract each other with a force which is inversely proportional to the square of the distance between them

Cany two bodies attract each other with a force which is proportional to the product of their masses and inversely proportional to the square of the distance between them

Dany two bodies attract each other with a force which is proportional to the square of the distance between them

Eany two bodies attract each other with a force which is proportional to the sum of their masses

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Question 2313

jamb 1979

fig 12 shows the velocity time graph of a car which starts from rest and is accelerated uniformly at the rate of 3m sec^-2 for 5 seconds. It attains a velocity which is maintained for a minute, The car is then brought to rest by a uniform retardation after another 3 seconds. calculate the total distance covered

A900m

B1920m

C960m

D860m

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Question 2314

jamb 1979

An electrical circuit is connected up as shown above, which of the following is correct about the value of current flowing through the 1 ohm resistance?

A12/13A

B13/12A

C1/3A

D3A

E12/7A

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Question 2315

jamb 1979

fig 10 shows a see-saw which is perfectly in balance, the weighs of the people sitting on it are 50kg, xkg and 15kg as shown, the sit at distances of 1.5, 1.5 and 2m from the pivot respectively. The vale of X is

A30

B35

C70

D24.25

Eimpossible to find

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Question 2316

jamb 1979

For the wave motion represented above

The wavelength is given by

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Question 2317

jamb 1979

Fig 8 shows a current I flowing in a copper wire situated in a magnetic field existing between the pole-pieces of a horse-shoe magnet.
Which of the following statements is correct?

AThe wire will experience a force in the direction into the paper

BThe wire will experience a force in the direction out of the paper

CThe wire will vibrate in a direction into and out of the paper

Dthe wire will move in the direction of the field i.e toward the s-pole

Ethe wire will not move because it is made of copper which is non magnetic

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Question 2318

jamb 1979

A uniform bean HK of length 10m and weighing 200N is supported at both ends as shown above. A man weighing 1000N stands at a point P on the beam. If the reactions at point H an K respectively are 800N and 400N, Then the distance HP is

A4m

B3.5m

C3m

D\( 6 \frac{2}{3} \)m

E7m

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Question 2319

jamb 1979

In a resonance tube experiment, which is illustrated above, the velocity of sound in air is 327.68m/s, the frequency of the turning fork used is therefore?

A128HZ

B256HZ

C512HZ

D768HZ

E1024HZ

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Question 2320

jamb 1979

An air column 10cm in length is trapped into the sea end of a capillary tube by a 15cm column of mercury with the tube held vertically as shown above. On inverting the tube the air column becomes 15cm long. The atmospheric pressure during the experiment is

A90cm

B76cm

C75cm

D60cm

E50cm

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Question 2321

jamb 1979

In a given circuit, the cell P has an emf 1.5V and an unknown internal resistance while cell Q has an emf 2.0V and an internal resistance of 1 ohm if the ammeter reads 50m A, Then r is equal to

A0.5 ohm

B0.62 ohm

C1.0 ohm

D2.0 ohm

E3.0 ohm

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Question 2322

jamb 1979

The diagram shows lens arrangement in

AA Compound Microscope

Bastronomical telescope

Cbinocular

Dperiscope

Eprojection lantern

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Question 2323

jamb 1979

A concave lens of focal length 20cm form an image 1/2 the size of the object. The object distance is

A100cm

B\( \frac{100}{q} \)

C60cm

D\( \frac{60}{7} \)

ENone of the above

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Question 2324

jamb 1979

Which of the following statements is correct? Silvered walls of a vacuum flask are used to prevent

Aheat loss due to conduction

Bvacuum loss

Cheat entry into the inner flask due to convection

Dheat loss due to radiation

Eheat loss due to convection

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Question 2325

jamb 1979

Radio carrier waves are generated by causing electrons to oscillate rapidly in

Aa microphone

Ba television camera

Can antenna

Dcoaxial cables

Ea transmitter

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Question 2326

jamb 1979

A weight of 1000 grams hangs from a lever 20cm to the fulcrum. At the left is a 500-gram weight 20cm from the fulcrum, and a 200-gram weight x cm away from the fulcrum. What is the value of x that will make the lever balanced?

A50cm

B20cm

C10cm

D30cm

E70cm

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Question 2327

jamb 1979

It is known that a neutron exists in a light atomic nucleus. Which of the following also exists in the nucleus?

Aan electron

Ba \(\beta\)-particle

Can \(\alpha\)-particle

Da proton

Ean atom

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Question 2328

jamb 1979

A body is released from rest and allowed to fall freely from a given height under gravity. The kinetic energy at its half-way point is?

Aa little above half of its initial energy

Ba little below half of its initial energy

Ca half of its initial energy

Da little above its initial energy

Ea little below its initial energy

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Question 2329

jamb 1979

On which of the following is the operation of a moving coil galvanometer based?

AMagnetic effect of electric current

BElectromagnetic induction

CChemical reaction produced by electricity

DForce on current carrying conductor in a magnetic field

EElectrical energy and power

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Question 2330

jamb 1979

The speed of light in air is 3 x 10⁸ms^-1. If the refractive index of light from air-to-water is \(\frac{4}{3}\), then which of the following is the correct value of the speed of light in water?

A4 x 10⁸ms^-1

B2.25 x 10⁸ms^-1

C\(\frac{4}{9}\) x 10⁸ms^-1

D2.25 x 10²ms^-1

E4.33 x 10⁸ms^-1

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