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2,483 questions

Question 1 of 20 2,483 total questions

Question 121

jamb 2023

A generator manufacturing company accidentally made an AC generator instead of a DC generator. To fix this error,

Athe magnetic field needs to be made stronger

Bthe split rings should be replaced with slip rings

Cthe number of turns of the armature coil needs to be decreased

Dthe slip rings should be replaced with split rings

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Question 122

jamb 2023

Which of the following materials is a good insulator?

ASilver

BWater

CRubber

DCopper

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Question 123

jamb 2023

The electrolyte used in the Nickel-Iron (NiFe) accumulator is

Adilute tetraoxosulphate(VI) acid

Bbarium chloride solution

Cpotassium hydroxide solution

Dsodium hydroxide solution

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Question 124

jamb 2023

What is the name of the model of the atom that describes electrons as orbiting the nucleus in specific energy levels?

ABohr model

BDalton model

CRutherford model

DThomson model

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Question 125

jamb 2023

Which of the following liquids has the highest surface tension?

ASoapy water

BWater

CMercury

DOil

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Question 126

jamb 2023

Which of the following is NOT a limitation of experimental measurements?

ASystematic error

BInstrument resolution

CRandom errors

DHuman error

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Question 127

jamb 2023

When light of a certain frequency is incident on a metal surface, no photoelectrons are emitted. If the frequency of the light is increased, what happens to the stopping potential?

AThe stopping potential does not change.

BThe stopping potential decreases.

CThe stopping potential can either increase or decrease, depending on the intensity of the light.

DThe stopping potential increases.

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Question 128

jamb 2023

From the diagram above, if the potential differences across the resistor, capacitor, and inductor are 30V, 120V, and 60V, respectively, the effective potential difference is

A81

B67

C59

D73

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Question 129

jamb 2023

Which of the following is a type of incandescent light source?

AFluorescent lamp

BLED lamp

CTungsten filament lamp

DNeon lamp

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Question 130

jamb 2023

The working of the beam balance is based on the principle of

Amoments

Bconservation of energy

Cequivalence

Dfloatation

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Question 131

jamb 2023

The branch of physics that deals with the motion of objects and the forces acting on them is called:

AElectromagnetism

BThermodynamics

CMechanics

DQuantum mechanics

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Question 132

jamb 2023

A charge of \(4.6 × 10^{-5}\)C is placed in an electric field of intensity \(3.2 × 10^4\) \(Vm^{-1}\). What is the force acting on the electron?

A1.5 N

B3.7 N

C4.2 N

D2.5 N

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Question 133

jamb 2023

An explosion occurs at an altitude of 312 m above the ground. If the air temperature is -10.00°C, how long does it take the sound to reach the ground?

[velocity of sound at \(0^oC\) = 331 ms-1]

A0.94s

B0.96s

C0.93s

D0.95s

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Question 134

jamb 2023

The diagram above illustrates the penetrating power of some types of radiation. X, Y and Z are likely

AX = α-particle; Y = γ-ray; Z = β-particle

BX = α-particle; Y = β-particle; Z = γ-ray

CX = γ-ray; Y = α-particle; Z = β-particle

DX = β-particle; Y = γ-ray; Z = α-particle

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Question 135

jamb 2023

The sensitivity of a thermometer is

AAll of the above

Bhow quickly a temperature change can be detected

Cthe difference between the maximum and the minimum temperature

Dthe smallest temperature change that can be detected or measured

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Question 136

jamb 2023

An open-tube mercury manometer is used to measure the pressure in a gas tank. When the atmospheric pressure is 101,325 \(P_a\), what is the absolute pressure in \(P_a\) in the tank if the height of the mercury in the open tube is 25 cm higher. density of mercury = \(13600kg/m^3, g = 9.8m/s^2\)

A108,986 Pa

B165,238 Pa

C122,364 Pa

D134,645 Pa

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Question 137

jamb 2023

A beam of light travelling in water is incident on a glass which is immersed in the water. The incident beam makes an angle of \(40^o\) with the normal. Calculate the angle of refraction in the glass.

[Refractive index of water = 1.33, Refractive index of glass = 1.5]

A\(29.36^o\)

B\(25.37^o\)

C\(37.21^o\)

D\(34.75^o\)

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Question 138

jamb 2023

How much work is done against the gravitational force on a 3.0 kg object when it is carried from the ground floor to the roof of a building, a vertical climb of 240 m?

A7.2 kJ

B4.6 kJ

C6.8 kJ

D8.4 kJ

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Question 139

jamb 2023

A relative density bottle has a mass of 19 g when empty. When it is completely filled with water, its mass is 66 g. What will be its mass if completely filled with alcohol of relative density 0.8?

A47 g

B52.8 g

C37.6 g

D56.6 g

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Question 140

jamb 2023

An object is placed 35 cm away from a convex mirror with a focal length of magnitude 15 cm. What is the location of the image?

A26.25 cm behind the mirror

B10.5 cm behind the mirror

C26.25 cm in front of the mirror

D10.5 cm in front of the mirror

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