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4,719 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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4,719 questions

Question 1 of 20 4,719 total questions

Question 721

waec 2013

A potential difference of 12V is applied across the ends of a 6\(\Omega\) resistor for 10 minutes. Determine the quantity of heat generated

A720J

B1200J

C14400J

D43200J

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Question 722

waec 2013

A charge of 2.0 x 10\(^{-5}\) C experiences a force of 80N in a uniform electric field. Calculate the magnitude of the electric field intensity

A8.0 x 10⁶ NC^-1

B4.0 x 10⁶ NC^-1

C4.0 x 10⁴ NC^-1

D2.0 x 10⁴ NC^-1

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Question 723

waec 2013

When a person holds a negatively charges metal rod and stands bare-footed on the ground, how will the charges leak?

Anegative charges flows to the ground through the person's body

Bpositive charges flow from the ground through his body to neutralize the negative charges

Cpositive charges in the air neutralizes the negative charges the person is holding

Dnegative charges will leak through the air

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Question 724

waec 2013

Which of the following statements about waves in pipes is correct?

Afor open pipes, there is only one end correction to be accounted for

Bfor closed pipes, there are two end corrections to be accounted for

Conly odd harmonics are possible in closed pipes

Dall harmonics are possible in closed pipes

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Question 725

waec 2013

A string under tension produces a note of frequency 14Hz. Determine the frequency when the tension is quadrupled.

A14Hz

B18Hz

C28Hz

D56Hz

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Question 726

waec 2013

Which of the following radiations has it's frequency lower than that of infrared radiation?

AUtra-violet rays

Bgamma rays

Cx-rays

Dradio waves

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Question 727

waec 2013

Which of the following statements about the Galilean telescope is not correct?

Athe final image is inverted

Bit is shorter than terrestial telescope

Cthe final image is erect

Dit has a small field of view

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Question 728

waec 2013

A diverging lens of focal length 30cm produces an image 20cm from the lens. Determine the object distance

A10cm

B12cm

C50cm

D60cm

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Question 729

waec 2013

The refractive index of a material is 1.5. Calculate the critical angle at the glass-air interface

A19^o

B21^o

C39^o

D42^o

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Question 730

waec 2013

Images formed by a convex mirror are always

Amagnified

Bbehind the mirror

Creal

Dinverted

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Question 731

waec 2013

At which position should an object be placed in front of a concave mirror in order to obtain an image which is of the same size as the object?

Aat the centre of curvature

Bat the principal focus

Cbetween the pole and principal focus

Dbetween the centre of curvature and principal focus

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Question 732

waec 2013

The equation of a certain progressive transverse wave is y = 2 sin 2 \(\pi ( \frac{t}{0.01} - \frac{x}{30})\), where x and y are in cm and t in seconds. Calculate the period of the wave.

A0.001s

B0.010s

C10.000s

D100.000s

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Question 733

waec 2013

When salt is dissolved in water, the freezing point of the water

Aincreases

Bdecreases

Cremains the same

Dincreases and later decrease

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Question 734

waec 2013

An electric heater has a resistance of 50\(\Omega\). When it is immersed in water and connected to mains source, it draws a current of 4.0A. Calculate the heat gained by the water if the heater is switched on for 2 minutes, assuming no heat losses to the surroundings

A4200J

B1600J

C24000J

D96000J

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Question 735

waec 2013

Ice of mass 10g at 5°C was completely converted to water at 0°C, calculate the quantity of heat used. [specific heat capacity of ice = 2.1 Jg\(^{-1}\)K\(^{-1}\), specific latent heat of fusion of ice = 336 Jg\(^{-1}\)]

A105J

B3255J

C3465J

D16821J

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Question 736

waec 2013

The volume of a given mass of gas at 27^oC and 800 mmHg is 76cm². Calculate its volume at s.t.p

A100.0 cm³

B72.8 cm³

C60.0 cm³

D36.4 cm³

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Question 737

waec 2013

Highly polished silvery surfaces are

Apoor absorbers and poor emitters of radiation

Bpoor absorbers and good emitters of radiation

Cgood absorbers and poor emitters of radiation

Dgood absorbers and good emitters of radiation

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Question 738

waec 2013

The magnitude of the expansion or contraction of a substance depends on the i. temperature change ii. nature of the substance iii. size of the substance. Which of the statements above are correct?

Ai and ii only

Bii and iii only

Ci and iii only

Di, ii and iii

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Question 739

waec 2013

Which of the following types of thermometer is used for the calibration of other thermometers?

Aliqud-in-glass thermometer

Bconstant volume gas thermometer

Coptical pyrometer

Dthermocouple

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Question 740

waec 2013

The velocity ratio of an inclined plane

Aincreases with increase in the angle of inclination

Bincreases with decrease in the angle of inclination

Cdecreases with decrease in the angle of inclination

Dis independent of the angle of inclination

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