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50 questions

Question 1 of 20 50 total questions

Question 11

jamb 1999

The core of an efficient transformer should consist of laminated pieces of metal in order to

Aincrease the heat produced by increasing the eddy current

Bincrease the heat produced by reducing the eddy current

Creduce the heat produced by increasing the eddy current

Dreduce the heat produced by reducing the eddy current

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Question 12

jamb 1999

At what frequency would a 10H inductor have a reactance of 2000Ω?

Aπ/200Hz

Bπ/100Hz

C100/πHz

D100πHz

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Question 13

jamb 1999

In fleming's right-hand rule, the thumb, the forefinger and the middle finger if held mutually at right angles represent respectively, the

Amotion, the field and the induced current

Binduced current, the motion and the field

Cfield, the induced current and the motion

Dinduced current, the field and the motion

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Question 14

jamb 1999

A galvanometer has a resistance of 5Ω. By using a shunt wire of resistance 0.05Ω, the galvanometer could be converted to an ammeter capable of reading 2Amp. What is the current through the galvanometer?

A2mA

B10mA

C20mA

D25mA

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Question 15

jamb 1999

A 3000W electric cooker is to be used on a 200V mains circuit. Which of the fuses below can be used safely with the cooker?

A2A

B5A

C10A

D20A

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Question 16

jamb 1999

Four cells each of e.m.f 1.5V and internal resistance of 4Ω are connected in parallel. What is the effective e.m.f. and internal resistance of the combination?

A6.0V, 16Ω

B6.0V, 1Ω

C1.5V, 4Ω

D1.5V, 1Ω

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Question 17

jamb 1999

Steel is more suitable for permanent magnet than iron because the former

Ais easily demagnetized by shaing vigorously

Bis an alloy of many metals

Cis easily magnetized by alternating current through one cycle

Dretains magnetism more than iron

View Explanation & Discuss

Question 18

jamb 1999

Which of the following electromagnetic waves is least energetic?

AInfra-red rays

BX-rays

CUltra-violet rays

DGamma rays

View Explanation & Discuss

Question 19

jamb 1999

An astronomical telescope is said to be in normal adjustment when the

Aeye is accommodated

Bfocal length of objective lens is longer than that of eye piece

Cfinal image is at the near point of eye

Dfinal image is at infinity

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Question 20

jamb 1999

The velocities of light in air and glass are 3.0 x 108ms-1 and 2.0 x 108ms-1 respectively. If the angle of refraction is 30°, the sine of the angle of incidence is

A0.33

B0.50

C0.67

D0.75

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Question 21

jamb 1999

The inside portion of part of a hollow metal sphere of diameter 20cm is polished. The portion will therefore form a

Aconcave mirror of focal length 5cm

Bconcave mirror of focal length 10cm

Cconvex mirror of focal length 5cm

Dconvex mirror of focal length 20cm

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Question 22

jamb 1999

A man stands 4m in front of a plane mirror. If the mirror is moved 1m towards the man, the distance between him and his new image is

A3m

B5m

C6m

D10m

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Question 23

jamb 1999

The lowest note emitted by a stretched string has a frequency of 40Hz. How many overtones are there between 40hz and 180Hz?

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Question 24

jamb 1999

If a sound wave goes from a cold air region to a hot air region, its wavelength will

Aincrease

Bdecrease

Cdecrease then increase

Dremain constant

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Question 25

jamb 1999

The equation of a wave traveling along the positive x-direction is given by;
y = 0.25 x 10\(^{-3}\) sin (500t - 0.025x).
Determine the angular frequency of the wave motion.

A0.25 x 10^-3rad s^-1

B0.25 x 10^-1rad s^-1

C5.00 x 10²rad s^-1

D2.50 x 10³rad s^-1

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Question 26

jamb 1999

Calculate the mass of ice that would melt when 2kg of copper is quickly transferred from boiling water to a block of ice without heat loss.
Specific heat capacity of copper = 400JKg-1K-1
Latent heat of fusion of ice = 3.3 x 10\(^5\)JKg-1

A8/33kg

B33/80kg

C80/33kg

D33/8kg

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Question 27

jamb 1999

The temperature gradient across a copper rod of thickness 0.02m, maintained at two temperature junctions of 20°C and 80°C respectively is

A3.0 x 10²Km^-1

B3.0 x 10³Km^-1

C5.0 x 10³Km^-1

D3.0 x 10⁴Km^-1

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Question 28

jamb 1999

I. A liquid boils when its saturated vapour pressure is equal to the external pressure
II. Dissolved substances in pure water lead to increase in the boiling point.
III. When the external pressure is increased, the boiling point increases.
IV. Dissolved substances in pure water decrease the boiling point.

Which combination of the above are peculiarities of the boiling point of a liquid?

AI, II and III

BI, II, III and IV

CI, II and IV

DII, III and IV

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Question 29

jamb 1999

A piece of substance of specific head capacity 450JKg-1K-1 falls through a vertical distance of 20m from rest. Calculate the rise in temperature of the substance on hitting the ground when all its energies are converted into heat. [g = 10ms-2]

A2/9°C

B4/9°C

C9/4°C

D9/2°C

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Question 30

jamb 1999

A gas at a volume of V0 in a container at pressure P0 is compressed to one-fifth of its volume. What will be its pressure if the magnitude of its original temperature T is constant?

AP₀/5

B4P₀/5

CP₀

D5P₀

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