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4,719 questions

Question 1 of 20 4,719 total questions

Question 1591

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 1592

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 1593

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 1594

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 1595

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 1596

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 1597

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 1598

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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Question 1599

jamb 1999

When temperature of a liquid increases, its surface tension

ADecreases

BIncreases

CRemain Constant

DIncreases then decreases

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Question 1600

jamb 1999

A solid weigh 10 .00 N in air, 6 N when fully immersed in water and 7 . 0 N when fully immersed in a liquid X. Calculate the relative density of the liquid, X.

A5/3

B4/3

C3/4

D7/10

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Question 1601

jamb 1999

If the stress on a wire is 10\(^7\)Nm\(^{-2}\) and the wire is stretched from its original length of 10.00 cm to 10.05 cm. The Young's modulus of the wire is

A5 . 0 x 10⁴ Nm^-2

B5 . 0 x 10⁵ Nm^-2

C2 . 0 x 10⁸ Nm^-2

D2 . 0 x 10⁹ Nm^-2

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Question 1602

jamb 1999

When the brakes in a car are applied, the frictional force force on the tyres is

Ais a disadvantage because it is in the direction of the motion of the car

Bis a disadvantage because it is in the opposite direction of the motion of the car

Cis an advantage because it is in the direction of the motion of the car

Dis an advantage because it is in the opposite direction of the motion of the car

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Question 1603

jamb 1999

A car of mass 800kg attains a speed of 25m/s in 20 secs. The power developed in the engine is

A1 . 25 x 10⁴ W

B2 . 50 x 10⁴ W

C1 . 25 x 10⁶W

D2 . 50 x 10⁶ W

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Question 1604

jamb 1999

A ball of mass 0.1kg is thrown vertically upwards with a speed of 10ms-1 from the top of a tower 10m high. Neglecting air resistance, its total energy just before hitting the ground is

(take g = 10ms-2)

A5 J

B10 J

C15 J

D20 J

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Question 1605

jamb 1999

A lead bullet of mass 0.05kg is fired with a velocity of 200ms\(^{-1}\) into a lead block of mass 0.95kg. Given that the lead block can move freely, the final kinetic energy after impact is

A50 J

B100 J

C150 J

D200 J

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Question 1606

jamb 1999

Particles of mass 10\(^{-2}\)kg is fixed to the tip of a fan blade which rotates with angular velocity of 100rad-1. If the radius of the blade is 0.2m, the centripetal force is

A2 N

B20 N

C200 N

D400 N

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Question 1607

jamb 1999

Two bodies have masses in the ratio 3:1. They experience forces which impart to them acceleration in the ratio 2:9 respectively. Find the ratio of forces the masses experienced.

A1 : 4

B2 : 1

C2 : 3

D2 : 5

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Question 1608

jamb 1999

The inner diameter of a test tube can be measured accurately using a?

Amicrometer screw guage

Bpair of dividers

Cmetre rule

Dpair of vernier calipers

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Question 1609

waec 1998

It is always not possible to determine exactly and simultaneously the position and momentum of a particle. This statement is known as the

ADe broglie's law

BHeisenberg's uncertainty principle

CCompton effect

DFrank-Hertz experimental law

EWave particle paradox

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Question 1610

waec 1998

Two radioactive elements X and Y have half-lives of 100 and 50 years respectively. Samples of X and Y initially contain equal number of atoms. What is the ratio of the number of the remaining atoms of X to that of Y after 200 years?

A4:1

B3:1

C1:1

D1:2

E1:4

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