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98 questions

Question 1 of 20 98 total questions

Question 21

waec 2011

A stone of mass 300g is released from rest from the top of a bulding of height 100m. Determine the kinetic energy gained by the stone when it is a quarter way down from the point of release.[g = 10 ms^-2]

A750.0J

B225.0J

C75.0J

D22.5J

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Question 22

waec 2011

Which of the following propeties is not considered in choosing mercury as a thermomemetric liquid?

Adensity

Bexpansivity

Cconductivity

Dopacity

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Question 23

waec 2011

In the absence of gravitational force, the weight of the body is

Aits mass

Bzero

Cits density

Dits volume

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Question 24

waec 2011

The area under a velocity-time graph represents

Afinal velocity attained

Bdistance covered

Cacceleration

Dworkdone

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Question 25

waec 2011

The property of a fluid that is used to determine its suitability as a lubricant is its

Acapillarity

Bviscocity

Csurface tension

Drelative density

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Question 26

waec 2011

The pressure in a liquid

Ais the same at all points in the liquid

Bdecreases with depth

Cis the same in all directions at a given point

Dis equal to the atmospheric pressure

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Question 27

waec 2011

A metal rod of density 7000 kgm^-3 and cross-sectional area of 0.001257m² has a mass of 1.76kg. Calculate its length.

A0.20m

B0.25m

C0.40m

D0.50m

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Question 28

waec 2011

The density P of a spherical ball of diameter d and mass m is given by

AP = \(\frac{3m}{4 \pi d^3}\)

Bp = 4\(\pi md^3\)

Cp = \(\frac{6m}{\pi d^3}\)

Dp = \(\frac{3m}{2 \pi d^3}\)

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Question 29

waec 2011

Which of the following statements is not correct?

Amolecules of ice, water and water vapour have equal intermolecular distances

Bmolecules of ice, water and water vapour do not differ in the structure of their molecules

Cmolecules of water vapour attract each other with forces far less than the forces of attraction between water molecules

Dwater is less compressible than water vapour

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Question 30

jamb 2011

Two resistors 5Ω and 10Ω are arranged first in series and later in parallel to a 24V source, the ratio of total power dissipated in the series and parallel arrangements respectively is

A5:3

B1:50

C50:1

D3:5

ENo Correct Option

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Question 31

jamb 2011

In an A.C circuit, the ratio of r.m.s value to peak value of current is

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

C\( \frac{1}{\sqrt{2}} \)

D\( \sqrt{2} \)

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Question 32

jamb 2011

In Homes, electrical appliances and lamps are connected in parallel because

AParallel connections do not heat up the wires

Bindependence switches can be used

Cless current will be used

Dless voltage will be used

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Question 33

jamb 2011

If the volume of a gas increases steadily as the temperature decreases at constant pressure, the gas obeys

AGraham's Law

BBoyle's Law

CPressure law

DCharles Law

ENo Correct Option

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Question 34

jamb 2011

In the circuit above, three resistors, 2Ω, 4Ω and 12Ω are connected in parallel and a 12V battery is connected across the combination. The current flowing through the 12Ω resistors is

A14.4 A

B1.0 A

C3.2 A

D9.6 A

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Question 35

jamb 2011

A length of wire has a frequency of 225Hz when stretched by a force of 225N. If the force increased to 324N, what is the new frequency of vibration?

A270 Hz

B512 Hz

C488 Hz

D356 Hz

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Question 36

jamb 2011

An image in a convex lens is upright and magnified 3 times. If the focal length of the lens is 15 cm, what is the object distance?

A10 cm

B25 cm

C16 cm

D14 cm

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Question 37

jamb 2011

The correct expression for the potential at a point distance r from a charge q in an electric field is?

_q²

4πε_or²

_q²

4πε_or

4πε_or²

D\(\frac{q}{4πε_or}\)

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Question 38

jamb 2011

The diagram above show the positions of a cone. The position which can be described as neutral equilibrium is represented as

AZ only

BX only

CY and Z

DY and X

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Question 39

jamb 2011

The diagram above shows two vectors at right angles to each other. The value of the resultant vector is

A14.0 N

B10.0 N

C12.0 N

D13.0 N

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Question 40

jamb 2011

Which of the following will be applied when a metal Y is used to electroplate another metal X in electrolysis?

AX is the anode and very high current is used

BX is the anode and Y is the cathode

CY is the cathode and X is the anode

DY is the anode and very high current is used

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