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4,719 questions

Question 1 of 20 4,719 total questions

Question 361

jamb 2020

A magnetic needle is suspended first at the earth's north magnetic pole and then at a point on the magnetic equator. The respective angles between the needle and the horizontal are

A0\(^o\) and 0\(^o\)

B60\(^o\) and 60\(^o\)

C90\(^o\) and 90\(^o\)

D90\(^o\) and 0\(^o\)

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Question 362

jamb 2020

Two mirrors of the same length are arranges as show in the diagram. A ray of light NO strikes the system at O and emerges along PQ. The emergent ray has been deviated through

A220\(^o\)

B200\(^o\)

C210\(^o\)

D180\(^o\)

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Question 363

jamb 2020

A convex mirror is used as a driving mirror because

I. its image is erect

II. It has a large field of view

III. It has a long focal length

Identify the CORRECT statement(s)

AI and III only

BI and II only

CII and IIII only

DI, II and III only

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Question 364

jamb 2020

When a sound wave passes from air into water its

Aspeed and frequency increases but its wavelength remains the same

Bspeed and wavelength increases but its frequency remains the same

Cspeed decreases

Dspeed increases but its frequency and wavelength decreases

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Question 365

jamb 2020

One of the following readings represents the measurement of the length of a metal rod using vernier callipers. Taking the reading accuracy into consideration, the most likely one is

A5.16cm

B5.165cm

C5.0cm

D5.160cm

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Question 366

jamb 2020

A solid weighs 4.8g in air, 2.8g in water and 3.2g in Kerosine. The ratio of density of the solid to that of the kerosine is

B\(\frac{3}{2}\)

C\(\frac{2}{3}\)

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Question 367

jamb 2020

A transformer has 300 turns of wire in the primary coil and 30 turns in the secondary coil. If the input voltage is 100 volts, the output voltage is

A5 volts

B10 volts

C15 volts

D20 volts

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Question 368

jamb 2020

Tha mass of a proton is approximately equal to that of

Aan \(\alpha\)-particle

Ba \(\beta\)-Particle

Ca neutron

Dan electron

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Question 369

jamb 2020

What is the cost of running five 50W lamps and four 100W lamps for 10 hours if electrical energy costs 2 Kobo per KWh?

AN0.65

BN0.39

CN3.90

DN0.13

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Question 370

jamb 2020

Which of the following can be described as high tension transmission?

AHigh resistance and low voltage

BLow current and high voltage

CHigh current and low voltage

DHigh current and low resistance

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Question 371

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 372

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 373

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 374

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 375

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 376

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 377

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 378

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 379

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 380

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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