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145 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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145 questions

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Question 31

waec 2002

Two spheres of masses 100kg and 90kg respectively have their centres separated by a distance of 1.0m. Calculate the magnitude of the force of attraction between them. [G = 6.70 x 10^-11Nm^-2kg^-2]

A6.70 x 10^-11N

B6.70 x 10^-10N

C6.03 x 10^-11N

D6.03 x 10^-7N

View Explanation & Discuss

Question 32

waec 2002

Three capacitors each of capacitance 18\(\mu F\) are connected in series. Calculate the effective capacitance of the capacitors

A54.00\(\mu F\)

B18.00\(\mu F\)

C6.00\(\mu F\)

D0.17\(\mu F\)

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Question 33

waec 2002

Which of the following items can be used to compare the relative magnitudes of electric charges on two bodies?

Aebonite rod

Bgold leaf electroscope

Cproof plane

Dthe electrophorus

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Question 34

waec 2002

Which of the following actions will not cause an increase in the frequency of a vibrating string?

Aincreasing the tension of the string

Bdecrease the mass per unit lengthof the string

Cdecrease the length of the string

Dincreasing the cross sectional area of the string

View Explanation & Discuss

Question 35

waec 2002

Which of the following instruments is not a wind instrument?

Aclarinet

Bsaxophone

Ctrumpet

Dxylophone

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Question 36

waec 2002

When two notes of nearly equal frequencies are sounded together, a periodic rise and fall in sound intensity can be heard. This phenomenon can be called

Abeats

Bdiffraction

Covertones

Dresonance

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Question 37

waec 2002

A pulse of a sound is transmitted from a ship and the reflection from the sea bed is recorded after 0.2s. Calculate the depth of the sea. [Take speed of sound in sea water = 1560ms^-1]

A312.0m

B156.0m

C78.0m

D31.2m

View Explanation & Discuss

Question 38

waec 2002

In a compound microscope, the image formed by the objective lens is at a distance of 3.0cm from the eye lens. If the final image is at 25.0cm from the eye lens, calculate the focal length of the eye lens

A0.3cm

B2.7cm

C3.4cm

D8.3cm

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Question 39

waec 2002

A converging lens of focal length 15cm forms a virtual image at a point 10cm from the lens. Calculate the distance of the object from the lens

A10.00cm

B6.00cm

C5.00cm

D1.50cm

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Question 40

waec 2002

The refractive index of a medium relative to air is 1.8. Calculate to the nearest degree, the critical angle for the medium

A68^o

B56^o

C34^o

D18^o

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Question 41

waec 2002

The size of the hole of a pin hole camera is increased. The resultant image formed becomes

Asharper

Breduced in size

Cenlarged

Dblurred

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Question 42

waec 2002

In the wave equation y = E_o, sin(299t - \(\pi\)), E_o represents the

Aamplitude

Bfrequency

Cperiod

Dwavelength

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Question 43

waec 2002

A radio wave has a wavelength of 150m. If the velocity of radio waves is free spaces is 3 x 10\(^8\) ms\(^{-1}\), calculate the frequency of the radio wave

A4.50 x 10¹⁰Hz

B5.0 x 10⁹Hz

C4.5 x 10⁹Hz

D2.0 x 10⁶Hz

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Question 44

waec 2002

A slinky spring fixed at one end is placed horizontally on a table. The free end is displaced parallel to the table and then released. The resultimg wavelength is

Atransverse

Blongitudinal

Cstationary

Delectromagnetic

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Question 45

waec 2002

What type of motion does the skin of a 'talking' drum perform when it is struck with a drum stick?

ARandom

BRational

CTranslational

Dvibratory

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Question 46

waec 2002

Calculate the energy required to vapourise 50g of water initially at 80oC.[specific heat capacity of water = 4.2Jg-1K-1][specific latent heat of vaporisation of water = 2260Jg-1]

A113,000J

B117,200J

C234,400J

D420,000J

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Question 47

waec 2002

Water of mass 120g at 50oC is added to 200g of water at 10oC and the mixture is well stirred. Calculate the temperature of the mixture. [Neglect heat losses to the surrounding]

A60^oC

B40^oC

C25^oC

D10^oC

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Question 48

waec 2002

The silver coating on the inside of a vacuum flask reduces heat loss by

Aconduction

Bradiation

Ccondensation

Dconvention

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Question 49

waec 2002

The ice and steam points of a certain thermometer are -20° and 100° respectively. Calculate the Celsius temperature corresponding to 70° on the thermometer

A84.0^o

B75.0^o

C64.0^o

D58.0^o

View Explanation & Discuss

Question 50

waec 2002

Which of the following actions will improve the efficiency of the pulley system?

Areducing the mass of the pulley

Bincreasing the friction force between the string and the pulley

Cincreasing the mass per unit length of the string of the pulley

Dincreasing the mass of the pulley

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