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2,483 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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2,483 questions

Question 1 of 20 2,483 total questions

Question 211

jamb 2020

If a source of solid is moving, a stationary listener will hear a sound of different frequency. This is called?

Adoppler effect

Bresonance

Cultra sound

Drarefaction

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Question 212

jamb 2020

Natural radioactivity consists of emission?

A\(\alpha\)-particles and \(\beta\)-rays

B\(\alpha\)-particles and X-rays

C\(\gamma\)-ray and X-rays

D\(\alpha\)-particles and \(\beta\)-rays and \(\gamma\)-rays

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Question 213

jamb 2020

Which of the following statements on the use of X-rays is incorrect? X-rays are used

AIn a hospital to obtain photographs of tissues and bones in the body

BFor the treatment of malignant growths like cancer cells

CIn detecting fingerprints

DTo reveal hidden flaws in metal castings and welded joints work of art

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Question 214

jamb 2020

The effect of closing the key K in the circuit shown in the figure above would be to?

Aincrease the current by 0.4A

Breduce the current by 0.4A

Cincrease the current by 0.6A

Dreduce the current by 0.6A

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Question 215

jamb 2020

In the study of Physics, temperature and heat are often confused with each other. Which of the following statements correctly defines these two elements?

ATemperature is a measure of the average kinetic energy of the molecules of a substance

BHeat is a measure of the total kinetic energy of the molecules in a system

CDifferent materials require different amounts of heat to cause a given change in temperature

DAll of the above

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Question 216

jamb 2020

Which of the following statements about radioactivity is true?

(i) Alpha particle is positively charged

(ii) Beta particle is negatively charged

(iii) Gamma ray is neutral

(iv) Beta particle has the same mass as helium atom

(v) Gamma ray is charged.

Ai, ii, iii, iv only

Bi, ii, iii only

Civ and v only

Di, ii and v only

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Question 217

jamb 2020

In what range of temperature is the expansion of water anomalous?

A+208\(^o\)C to +212\(^o\)C

B-80\(^o\)C + -76\(^o\)C

C0\(^o\)C to +4\(^o\)C

D-4\(^o\)C to +0\(^o\)C

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Question 218

jamb 2020

If in a simple pendulum experiment the length of the inextensible string is increased by a factor of four, its period is increased by a factor of?

B\(\frac{\pi}{2}\)

C\(\frac{1}{4}\)

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Question 219

jamb 2020

A machine gun with a mass of 5kg fires a 50g bullet at a speed of 100 ms\(^{-1}\). The recoil speed of the machine gun is

A0.5 ms\(^{-1}\)

B1.5 ms\(^{-1}\)

C1 ms\(^{-1}\)

D2ms\(^-1\)

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Question 220

jamb 2020

The force required to make an object of mass m, travelling with velocity v, turn in a circle of radius r is

A\(\frac{mv^2}{r}\)

B\(\frac{mr^2}{x}\)

C\(\frac{mr}{v}\)

D\(\frac{mv}{r^2}\)

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Question 221

jamb 2020

A few grains of table salt were put in a cup of cold water, kept at constant temperature and left undistributed. Eventually all the water tested salty. This action is due to?

Aconvection

Bosmosis

Ccapillarity

Ddiffusion

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Question 222

jamb 2019

Which of the following is consistent with Charles' law?

BII

CIII

DIV

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Question 223

jamb 2019

Which of the following readings cannot be determined with a meter rule?

A2.56cm

B2.25cm

C2.50cm

D2.05cm

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Question 224

jamb 2019

A body was slightly displaced from its equilibrium position. Which one of the following is a condition for its stable equilibrium

Aan increase in the kinetic energy of the body

Ban increase in the potential energy of the body

Ca decrease in the kinetic energy of the body

Dan increase in the height of the body

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Question 225

jamb 2019

A mass of 0.5kg is whirled in a vertical circle of radius 2m at a steady rate of 2 rev/s. Calculate the centripetal force

A164N

B160N

C158N

D172N

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Question 226

jamb 2019

A cone is in unstable equilibrium, has its potential energy

Adecreased

Bincreased

Cunchanged

Doscillating

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Question 227

jamb 2019

The height at which the atmosphere ceases to exist is about 80km. If the atmospheric pressure on the ground level is 760mmHg, the pressure at a height of 20km above the ground level is
(ρm = 13.6g/cm\(^3\) ρ = 0.00013g/cm\(^3\) )

A380mmHg

B570mmHg

C190mmHg

D480mmHg

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Question 228

jamb 2019

The equilibrium position of objects in any field corresponds to situation of

Aequipotential energy

Bmaximum potential energy

Cminimum potential energy

Dminimum kinetic energy

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Question 229

jamb 2019

The diagram shows a uniform meter rule AB which balances horizontally at the 90cm mark when a mass of 0.2kg is suspended from B. Calculate the mass of the meter rule.

A0.05kg

B0.20kg

C0.80kg

D1.00kg

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Question 230

jamb 2019

A body moves in SHM between two point 20m on the straight line Joining the points. If the angular speed of the body is 5 rad/s. Calculate its speed when it is 6m from the center of the motion.

A20 m/s

B30 m/s

C40 m/s

D50 m/s

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