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4,719 questions

Question 1 of 20 4,719 total questions

Question 1131

neco 2005

Calculate the peak voltage that could be obtained from a 220 V\(_{r.m.s}\)main supply.

A70.7V

B110.0V

C155.6V

D311.1V

E440.0V

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Question 1132

neco 2005

Which of the following pairs is an example of translucent bodies?

ACardboard and moon

BClear water and glass

CFrosted glass and waxed paper

DOiled paper and brick

EWood and metal sheet

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Question 1133

neco 2005

The length of a simple pendulum is increased by a factor of four. By what factor is its period Increased?

A0.25

B0.5

C1.66

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Question 1134

neco 2005

When some ice cubes are added to a glass of warm water, the glass is cooled by a process of

Aconduction only

Bconvection only

Cconduction and convection

Dconduction and radiation

Eradiation only

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Question 1135

neco 2005

Mercury does NOT wet glass because

Aglass is an amorphous substance

Bthe adhesive force is greater than the cohesive force

Cthe cohesive force is greater than the adhesive force.

Dmercury has very high thermal conductivity

Emercury is opaque.

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Question 1136

neco 2005

When a yellow card is viewed in blue light, It will appear

Ablack

Borange

Cpurple

Dred

Ewhite

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Question 1137

neco 2005

Two metals A and B lose the same quantity of heat when their temperatures drop from 20°C to 15°C. If the specific heat Capacity of A Ii thrice that of B, calculate the ratio of the mass of A to that of B.

A3:01

B4:03

C3:04

D1:02

E1:03

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Question 1138

neco 2005

A voltage of 240V is connected to the primary coil of a transformer, the rating of the primary turns to the secondary turns if the voltage available at the secondary coil is 15V

A0.06

B0.9

C1.6

D16

E36

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Question 1139

neco 2005

Calculate the magnitude of the force due to a magnetic field of 0.40T on an electron moving perpendicular to the field with a speed of 4.00 × 106ms^-1 (e 1.60 × 10^-19C]

A6.40 × ^-10

B6.40× 10^-13N

C2.56 × 10^-13N

D1.60 × 10^-12N

E2.30 × 10^-11N

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Question 1140

neco 2005

A stone of mass 0.7 kg is projected vertically upward with a speed of 5 ms-1. Calculate the maximum height reached. [g =10ms^-2]

A1.25m

B1.50m

C2.50m

D3.75m

E5.00Nm

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Question 1141

neco 2005

A projectile is projected with an initial velocity u, at an angle θ to the horizontal. The maximum height attained is.

AU² sin \(\frac{\theta}{g}\)

B2U² sin² \(\frac{\theta}{g}\)

CU sin² \(\frac{\theta}{g}\)

DU² sin²\(\frac{\theta}{2g}\)

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Question 1142

neco 2005

Which of the following is a desirable property of a fuse Wire?

AHigh expansively

BHigh thermal conductivity

CLow density

DLow electrical resistivity

ELow melting point

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Question 1143

neco 2005

In which of the following is the expansion of solids a disadvantage?

AElectric iron

BFire alarm

CThe balance wheel of a watch

DThe bimetallic thermometer

EThe fitting of wheels in rims

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Question 1144

neco 2005

A 12V battery supplies a current of 0.4A to a lamp. Calculate the resistance of the lamp.

A30.00

B4.80

C3.00

D0.30

E0.03

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Question 1145

neco 2005

The following are derived units EXCEPT

Akg m^-3

CNs

Dm³

Ekg

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Question 1146

neco 2005

An atom radiates 1.5 × 10^-19J when an electron jumps from one level to another. What is the wavelength of the emitted radiation? (Planck’s constant 6.6 × l0^-34Js ; Speed of light in vacuum = 3.0 × 108ms^-1)

A1.32 × 10^-6m

B2.97 × 10^-6m

C3.30 × 10^-6m

D6.82 × 10^-6m

E8.01 × 10m^-6

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Question 1147

neco 2005

491 K is equivalent to

A273 °C

B218 °C

C373 °C

D491 °C

E764 °C

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Question 1148

neco 2005

Which of the statements is/are true of two bodies involved in an inelastic collision? After collision.

I. the kinetic energy increases
II. The momentum decreases
III. Their velocities are the same.

AI only

BII Only

CIII only

DI and II only

EII and III only

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Question 1149

neco 2005

A body moves along a circular path with uniform angular speed of 0.6 rad s^-1 and at a constant speed of 3.0 ms^-1.

Calculate the acceleration of the body towards the centre of the circle.

A0.2.ms^-2

B1.8 ms^-2

C5.0 ms^-2

D5.4 ms^-2

E25.0 ms^-2

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Question 1150

neco 2005

An object is placed in front of a concave mirror whose radius of curvature is 12cm. If the magnification of the Image produced is 1.5, how far is the object from the mirror?

A8cm

B10cm

C15cm

D18cm

E20cm

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