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1,904 questions

Question 1 of 20 1,904 total questions

Question 701

waec 1997

What is the frequency of a radio wave of wavelength 150m if the velocity of radio waves in free space is 3 x \(10^8ms^{-1}\)?

A4.5 x \(10^{10}\)Hz

B5x \(10^{9}Hz\)

C4.5 x \(10^{8}Hz\)

D2 x \(10^{7}Hz\)

E2 x \(10^{6}Hz\)

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Question 702

waec 1997

A cup containing 100g of pure water at 20°C is placed in a refrigerator. If the refrigerator extracts heat at a rate of 840J per minute, calculate the time taken for the water to freeze. Neglect the heat capacity of the material of the cup. (Specific heat capacity of water =4.2J\(g^{-1}K^{-2}\))((Specific latent heat fusion of water =336J\(g^{-1}\)

A15minutes

B20 minutes

C42 minutes

D50 minutes

E84 minutes

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Question 703

waec 1997

A converging lens of focal length 15cm is used to obtain a real image magnified \(1\frac{1}{2}\) times. Calculate the distance of the image from the lens?

A37.5cm

B22.5cm

C15cm

D7.5cm

E3.3cm

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Question 704

waec 1997

A fixed mass of gas occupies a volume of 20\(cm^3\) at a fixed pressure of 700mmHg. Assuming that the temperature remains constant, what will be the volume of the gas at 750mmHg?

A2.5\(cm^3\)

B15.5\(cm^3\)

C18.7\(cm^3\)

D21.4\(cm^3\)

E72.5\(cm^3\)

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Question 705

waec 1997

Calculate the quantity of heat released when 100g of steam at 100°C condenses to water(Take the specific latent heat of vaporization of water as 2.3x \(10^6Jkg^{-1}\))

A2.3x\(10^{1}J\)

B2.3x\(10^{2}J\)

C2.3x\(10^{4}J\)

D2.3x\(10^{5}J\)

E3.3x\(10^{7}J\)

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Question 706

waec 1997

A solid material of volume 100\(cm^{-3}\) is heated through a temperature difference of 40°C. Calculate the increase in the volume of the material if its linear expansitivity is 2 x \(10^{-6}K{-1}\)

A2.4 x\(10^{-2}cm^{-3}\)

B1.6 x\(10^{-2}cm^{-3}\)

C8 x\(10^{-2}cm^{-3}\)

D5 x\(10^{-2}cm^{-3}\)

E4 x\(10^{-2}cm^{-3}\)

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Question 707

waec 1997

Whenever light waves are restricted to a specific plane they are said to be

ADiffracted

BRefracted

CDiffused

DRegularly reflected

EPlane polarized

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Question 708

waec 1997

At what distance from a simple microscope must an object be placed so that the image 5 times the size of the object is produced 20cm from the lens?

A2cm

B3.3cm

C4cm

D5cm

E15cm

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Question 709

waec 1997

When white light is incident on a glass prism the spectrum produced on a screen placed beyond the prism is due to?

ADiffraction

BReflection

CRefraction

DPolarisation

EInterference

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Question 710

waec 1997

Which of the following explains why a thick glass cup cracks when boiling water is poured into it?

AUnequal expansion of the exterior and interior walls of the cup

BAnomalous expansion of the water

CGreater specific latent capacity of water compared with that of glass

DLarge increase in the heat capacity of the cup

EHigh density of the water

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Question 711

waec 1997

Steel bars each of length 3m at 28°C are to be used for constructing a rail line. If the linear expansitivity of the steel is 1 x \(10^{-5}K^{-1}\),what is the safety gap that must be left between the successive bars if the highest temperature expected is 40°C?

A1.2x \(10^{-1}cm\)

B7.2x\(10^{-1}cm\)

C6x\(10^{-1}cm\)

D3.6x\(10^{-2}cm\)

E1.8x\(10^{-1}cm\)

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Question 712

waec 1997

A piece of copper of mass 30g loses 60J of heat energy. If the specific heat capacity of copper is 400J\(kg^{-1}K^{-1}\), Calculate the change in the temperature of the copper

A0.2K

B0.8K

C2K

D4.5K

E5K

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Question 713

waec 1997

A solid plastic cube of side 0.2m is submerged in a liquid density of 0.8kg\(m^{-3}\). Calculate the upthrust of the liquid on the cube (g=10\(ms^{-2}\)

A0.064N

B0.025N

C0.016N

D0.008N

E0.003N

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Question 714

waec 1997

A missile weighing 400N on the earth surface is shot into the atmosphere to an altitude of 6.4 x \(10^{-6}\)m. Taking the earth as a sphere of radius 6.4 x \(10^{-6}\)m and assuming the inverse-square law of universal gravitation, what would be the weight of the missile at that altitude?

A100N

B200N

C400N

D800N

E1600N

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Question 715

waec 1997

Two forces 3N and 4N act on a body in directions due north and due east respectively. Calculate their equilibrant

A5N 53° east of North

B5N 53° west of the south

C5N 37° north of east

D7N 37° west of North

E7N 37° south of west

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Question 716

waec 1997

Two blocks of the same dimension, one steel and the other wooden are dropped simultaneously from the same height. If they fall freely neglecting air resistance the?

ATwo blocks hit the ground simultaneously because they have the same acceleration

BTwo blocks reach the ground at the same time because their dimensions are the same

CWooden block being lighter than the steel block reaches the ground first

DSteel block reaches the ground first because it is denser than the wooden block

ESteel block takes half as much time as the wooden block to reach the ground because it is more massive than the wooden block

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Question 717

waec 1997

A ball of mass 0.1kg approaching a tennis player with a velocity of 10ms\(^{-1}\),is hit back in the opposite direction with a velocity of 15ms\(^{-1}\). If the time of impact between the racket and the ball is 0.01s, calculate the magnitude of the force with which the ball is hit

A5000N

B500N

C250N

D50N

E25N

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Question 718

waec 1997

An object falls freely from a height of 25m onto the roof a building 5m high. Calculate the velocity with which the object strikes the roof (g=10\(ms^{-2}\)

A17.3\(ms^{-2}\)

B20\(ms^{-2}\)

C24.5\(ms^{-2}\)

D125\(ms^{-2}\)

E200\(ms^{-2}\)

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Question 719

waec 1997

An object of mass 0.40 kg attached to the end of a string is whirled around in a horizontal circle of radius 2.0m with a constant speed of 8\(ms^{-1}\). Calculate the angular velocity of the object

A0.8rad\(s^{-1}\)

B2 rad\(s^{-1}\)

C4 rad\(s^{-1}\)

D8 rad\(s^{-1}\)

E16 rad\(s^{-1}\)

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Question 720

waec 1996

The count rate of an alpha-particle source is 400 per minute. If the half-life of the source is 5 days, what would be the count rate per minute after 15 days?

A20

B25

C50

D200

E400

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