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49 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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49 questions

Question 1 of 20 49 total questions

Question 11

jamb 2009

A band of 500 rectangular loops of wire of area 20 cm by 20 cm, encloses a region of magnetic field which charges from 1.0T to 0.4T within 5 seconds, calculate the induced e.m.f.

A5.60 v

B24.00 v

C0.24 v

D2.40 v

View Explanation & Discuss

Question 12

jamb 2009

An electric lamp marked 240v, 60 W is left to operate for an hour. How much energy is generated by the filament?

A3.86 x 10⁵J

B3.56 x 10⁵J

C1.80 x 10⁴J

D2.16 x 10⁵J

View Explanation & Discuss

Question 13

jamb 2009

If negative charges are induced on an electroscope and a positively charged rod is brought near the cap of the electroscope, the leaves will?

Aclose up

Bbecome positively charged

Cbecome negatively charged

Dopen further

View Explanation & Discuss

Question 14

jamb 2009

Which of the following is a secondary colour

Ablue

Borange

Cred

Dgreen

View Explanation & Discuss

Question 15

jamb 2009

The ability of the human eye to focus object on the retina is referred to as the power of?

Ainterference

Bdiffraction

Caccomodation

Dsuperposition

View Explanation & Discuss

Question 16

jamb 2009

When light passes through two media x and y of refraction indices 1.51 and 1.33 respectively, the speed of light in

Ax is same as in y

Bx and y is same as in vacuum

Cx is higher than in y

Dy is higher than in x

View Explanation & Discuss

Question 17

jamb 2009

If the refractive index of crown glass is 1.51, its critical angle is?

A48.6°

B22.5°

C41.5°

D45.0°

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Question 18

jamb 2009

Calculate the position of an object placed in front of a convex mirror having focal length of 12 cm such that an image is formed 6 cm away from the mirror

A4. 0 cm

B3. 0 cm

C12.0 cm

D9.0 cm

View Explanation & Discuss

Question 19

jamb 2009

An object is placed 5 cm from the pole of a concave mirror. if the focal length of the mirror is 10 cm. what is the image distance?

A10 cm in front of the mirror.

B5 cm in front of the mirror

C10 cm behind the mirror

D5 cm behind the mirror

View Explanation & Discuss

Question 20

jamb 2009

I. Moon.
II. Sun.
III.street light.
IV. stars.
Which of these are natural sources of light?

AII, III, and IV only

BI, II and III only

CIII and IV only

DII and IV only

View Explanation & Discuss

Question 21

jamb 2009

Musical instruments playing the same note can be distinguished from one another owing to the differences in their?

Aquality

Bpitch

Cintensity

Dloudness

View Explanation & Discuss

Question 22

jamb 2009

Metal cables are used as telephone wires because?

Athey are cheap

Bthey are sourced locally

Cthe speed of sound in them is very low

Dthe speed of sound in them is very high

View Explanation & Discuss

Question 23

jamb 2009

A man standing 2 m from a charcoal fire is warmed mainly by?

Aconvection

Bradiation

Crefraction

Dconduction

View Explanation & Discuss

Question 24

jamb 2009

It is observed that water will wet a clean glass because the?

Acohesion of water to glass is stronger than the cohesion of water molecules

Badhesion of water molecules is weaker than the cohesion of water to glass

Ccohesion of water to glass is weaker than the cohesion of water molecules

Dadhesion of water molecules is stronger than the cohesion of water molecules

View Explanation & Discuss

Question 25

jamb 2009

A heating coil rated 1000 W is used to boil off completely 2 kg of boiling water. The time required to boil the water is?
[Special latent heat of Vaporization of water = 2.3 x 10\(^6\) Jkg-1]

A1.15 x 10⁴s

B1.15 x 10³s

C4.6 x 10⁴s

D4.6 x 10³s

View Explanation & Discuss

Question 26

jamb 2009

If the pressure of the vapor on top of an enclosed liquid is equal to the atmospheric pressure, what will be the temperature of the liquid enclosed?

Aroom temperature

Bboiling point

Cfreezing point

Dstandard temperature

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Question 27

jamb 2009

An electric heater rated 220V, 1000 W is immersed into a bucket full of water. Calculate the mass of water if the temperature changes from 30°c to 100°c and the current flows for 300seconds. [specific heat capacity of water = 4200 jkg-1 K-1]

A4.28 kg

B42.86 kg

C1.02 kg

D7.14 kg

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Question 28

jamb 2009

At 4°c, the volume of a fixed mass of water is?

Aconstant

Bminimum

Cmaximum

Dzero

View Explanation & Discuss

Question 29

jamb 2009

The thermometer whose reading is indicated by a change in color of its thermometric property is the?

Abi-metalic strip thermometer

Bthermocouple

Cplatinium resistance thermometer

Doptical pyrometer

View Explanation & Discuss

Question 30

jamb 2009

A plastic sphere floats in water with 50% of its volume submerged. if it floats in glycerine with 40% of its volume submerged,the density of the glycerine is?

A1400 kgm^-3

B1250 kgm^-3

C500 kgm^-3

D1000 kgm^-3

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