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Physics Past Questions

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87 questions

Question 1 of 20 87 total questions

Question 11

jamb 2018

A room is heated by means of a charcoal fire, an occupants of the room standing away from the fire is warmed mainly by

AConvection

BRadiation

CConduction

DReflection

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Question 12

jamb 2018

Which of the following is not a product of nuclear fusion?

AX – ray

BY –ray

Cα – particles

Dneutron

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Question 13

jamb 2018

The process by which protons are converted into helium atoms with a tremendous release of energy is called?

Athermionic emission

Bnuclear fission

Cthermonuclear fusion

Dphotoelectric emission

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Question 14

jamb 2018

Which of the following phenomena is the practical evidence for the existence of the continual motion of molecules.

ATransitional Motion

BRotational Motion

CBrownian Motion

DOscillatory Motion

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Question 15

jamb 2018

Water of mass 150g at 60\(^o\)c is added to 300g of water at 20\(^o\)c and the mixture is well stirred. Calculate the temperature of the mixture.(neglect heat losses to the surroundings)

A33\(^o\)c

B40\(^o\)c

C25\(^o\)c

D10\(^o\)c

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Question 16

jamb 2018

Mercury which is spilled onto a glass surface forms ball-like shapes because____.

AMercury is a metal

BThe cohesive force between its molecules is greater than the adhesive force between mercury and glass molecules

CThe cohesive force between its molecules is less than the adhesive force between mercury and glass molecules

DThe viscosity of mercury is height

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Question 17

jamb 2018

A 40W instrument has a resistance 90 Ohms. On what voltage should it be operated normally

A60V

B150V

C225V

D360V

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Question 18

jamb 2018

Which of the following is an essential physical property of the wires uses for making fuses ?

ALow density

BHypothermal conductivity

CLow electrical resistivity

DLow melting point

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Question 19

jamb 2018

A man hears his echo from a nearby hill 2s after he shouted. If the frequency of his voice is 260Hz and the wavelength is 1.29m, how far away is the hill?

A330.0m

B335.4m

C660.0m

D670.8m

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Question 20

jamb 2018

A solid cube of side 50cm and mass 75kg floats in a liquid with \(\frac{1}{3}\) of its height above the liquid surface. The relative density of the liquid is?

A0.33

B0.50

C0.67

D0.90

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Question 21

jamb 2018

Which of the following concepts is not an evidence of the particles nature of matter?

ADiffusion

BBrownian motion

CDiffraction

DEsterification

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Question 22

jamb 2018

The product of force and time is?

AImpulse

BMomentum

CInertia

DFriction

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Question 23

jamb 2018

Temperature is the property of a body which is proportional to the ____.

Atotal kinetic energy of its molecules

Baverage kinetic energy of its molecules

Caverage speed of its molecules

Dmaximum speed of its molecules

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Question 24

jamb 2018

What flows to the positively charged conductor by connecting it to the earth?

AElectrons

BIon

CNeutron

DProton

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Question 25

jamb 2018

An electric heating coil rated at 1Kw is used to heat 2kg of water for 2 minutes. The initial water temperature is 30\(^o\)C. Taking the specific heat of the water as 4,000Jkg \(^{-1}\) and neglecting that of the container, the final water temperature is

A15.0\(^o\)C

B45.0\(^o\)C

C60.0\(^o\)C

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Question 26

jamb 2018

A beam of light is incident from air to water at an angle of 30\(^o\). Find the angle of refraction if the refractive index of water is 4/3

A15\(^o\)

B18\(^o\)

C22\(^o\)

D24\(^o\)

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Question 27

jamb 2018

The resistance of a 40W car head lamp, drawing current from a 12V battery is ____.

A0.3Ω

B3.3Ω

C3.6Ω

D4.8Ω

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Question 28

jamb 2018

A force of 5N acts at a point Y on a rod XYZ as shown in this diagram. If XYZ is 2m, what is the moment of the force about point X?

A0Nm

B3Nm

C7Nm

D10Nm

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Question 29

jamb 2018

The energy needed to move a unit positive charge around a complete electric circuit is called the

Aelectromotive force

Belectric potential difference

Celectric energy

Dkinetic energy

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Question 30

jamb 2018

An object is placed 20cm from a concave mirror of focal length 10cm. The linear magnification of the image produced is?

B\(\frac{1}{2}\)

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