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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 221

jamb 2023

The surface temperature of a swimming pool on a warm day is 25ºC and the temperature at the bottom is 15ºC. If the swimming pool has a surface area of 620 \(m^2\) and a depth of 1.5m. Find the rate at which energy is transferred by conduction from the surface to the bottom of the swimming pool.
[Thermal conductivity of water (k) = 0.6071 Wm-1K-1]

A2.5kw

B250kw

C300kw

D3.0kw

View Explanation & Discuss

Question 222

jamb 2023

Rainbow formation is as a result of the combination of which of the following phenomena?
(i) Reflection
(ii) Dispersion
(iii) Total internal reflection
(iv) Refraction

A(ii) and (iv) only

B(i), (iii) and (iv) only

C(ii), (iii) and (iv) only

D(i), (ii) and (iv) only

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Question 223

jamb 2023

Name the type of equilibrium for each position of the ball

AA - unstable, B - neutral, C - stable

BA - stable, B - neutral, C - unstable

CA - stable, B - unstable, C - neutral

DA - unstable, B - stable, C - neutral

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Question 224

jamb 2023

The number of holes in an intrinsic semiconductor

Ais not equal to the number of free electrons

Bis greater than the number of free electrons

Cis equal to the number of free electrons

Dis less than the number of free electrons

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Question 225

jamb 2023

The half life of a radioactive material is 12 days. Calculate the decay constant.

A0.8663 \(day^{-1}\)

B0.04331 \(day^{-1}\)

C0.17325 \(day^{-1}\)

D0.05775 \(day^{-1}\)

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Question 226

jamb 2023

A lorry accelerates uniformly in a straight line with acceleration of \(4ms^-2\) and covers a distance of 250 m in a time interval of 10 s. How far will it travel in the next 10 s?

A650

B900

C800

D250

View Explanation & Discuss

Question 227

jamb 2023

The terminals of a battery of emf 24.0 V and internal resistance of 1.0 Ω is connected to an external resistor 5.0 Ω. Find the terminal p.d.

A18.0V

B12.0V

C16.0V

D20.0V

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Question 228

jamb 2023

Calculate the absolute pressure at the bottom of a lake at a depth of 32.8 m. Assume the density of the water is 1 x 10^3 kgm-3 and the air above is at a pressure of 101.3 kPa.

[Take g = 9.8 ms-2]

A422.7

B220.14

C464.53

D321.74

View Explanation & Discuss

Question 229

jamb 2023

On a particular hot day, the temperature is 40°C and the partial pressure of water vapor in the air is 38.8 mmHg. What is the relative humidity?

A70

B62

C80

D42

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Question 230

jamb 2023

A missile is launched with a speed of 75 ms-1 at an angle of 22° above the surface of a warship. Find the horizontal range achieved by the missile. Ignore the effects of air resistance.

[Take g = 10 ms-2]

A195

B271 m

C391 m

D136 m

View Explanation & Discuss

Question 231

jamb 2023

Find the tension in the two cords shown in the figure above. Neglect the mass of the cords, and assume that the angle is 38° and the mass m is 220 kg

[Take g = 9.8 ms-2]

A\(T_1\) = 2864 N, \(T_2\)= 3612 N

B\(T_1\)= 3612 N, \(T_2\) = 2864 N

C\(T_1\)= 3502 N, \(T_2\)= 2760 N

D\(T_1\) = 2760 N, \(T_2\) = 3502 N

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Question 232

jamb 2023

Which of the following statements regarding the application of electrical conduction via gases is/are correct?
Electrical conduction in gas is applied in:
(i) The identification of gases
(ii) Lighting/fluorescent tubes
(iii) Photocells
(iv) Cathode ray oscilloscope/T.V. tubes

A(i), (iii) and (iv) only

B(i), (ii) and (iv) only

C(ii), (iii) and (iv) only

D(i), (ii) and (iii) only

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Question 233

jamb 2023

The property of wave shown in the diagram above is?

ADiffraction

BRefraction

CPolarisation

DInterference

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Question 234

jamb 2023

Which wave property is unchanged when a wave enters a new medium?

Adirection

Bfrequency

Cwavelength

Dspeed

Question 235

jamb 2023

When a submerged object is totally immersed, the upthrust equals the weight of the

Aair displaced

Bobject

Cobject minus its weight

Dfluid displaced

Question 236

jamb 2023

Light is a form of

Aforce

Bmatter

Cpressure

Denergy

Question 237

jamb 2023

The acceleration due to free fall at the surface of the earth is approximately

A10.8 m/s??

B8.8 m/s??

C9.8 m/s??

D3.0 m/s??

Question 238

jamb 2023

Ohm's law states V =

AI+R

BIR

CR/I

DI/R

Question 239

jamb 2023

The energy possessed by a body due to its position is

Asound energy

Bkinetic energy

Cpotential energy

Dheat energy

Question 240

jamb 2023

The unit of power is the

Apascal

Bnewton

Cjoule

Dwatt

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