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139 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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139 questions

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Question 51

jamb 2009

A body of mass 12kg traveling at 4.2ms-1 collides with a second body of mass 18kg at rest. Calculate their common velocity if the two bodies coalesce after collision?

A1.5 ms^-1

B1.4 ms^-1

C2.1 ms^-1

D1.7 ms^-1

View Explanation & Discuss

Question 52

jamb 2009

A car accelerates uniformly from rest at 4 ms\(^{-2}\). How far will it travel in the fifth complete second?

A100 m

B50m

C32 m

D18 m

View Explanation & Discuss

Question 53

jamb 2009

An air craft attempt to fly due north at 100 kmh-1. If the wind blows against it from east to west at 60 kmh-1, its resultant velocity is?

A117 kmh^-1, N31^oE

B127 kmh^-1, N31^oE

C117 kmh^-1, N31^oW

D127 kmh^-1, N31^oW

View Explanation & Discuss

Question 54

jamb 2009

The value of x, y and z respectively in the expression M\(^x\) L\(^y\)T \(^z\) for the universal gravitational constant G are?

A2, -3, -2

B-1, 3, -2

C-1, 2, -3

D-2, -1, 3

View Explanation & Discuss

Question 55

jamb 2009

When a pentavalent impurity is added to a pure semiconductor, it becomes?

Aa p-type semiconductor

Ban n-type semiconductor

Can insulator

Dan intrinsic semi-conductor

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Question 56

jamb 2009

Which of the following can conduct electricity owing to the presence of free mobile electrons?

Agermanium

Bsilicon

Cgrapefruit

Dcopper

View Explanation & Discuss

Question 57

jamb 2009

Thermionic emission is the process whereby?

Aβ - rays are produced

Bholes are produced

Cx - rays are produced

Delectrons leave a hot element

View Explanation & Discuss

Question 58

jamb 2009

A piece of radioactive material contains 10\(^{20}\) atoms.
If the half life of the material is 20 seconds, the number of disintegration in the first second is?

A3.47 x 10¹⁸

B6.93 x 10 ²⁰

C3.47 x 10²⁰

D6.93 x 10¹⁸

View Explanation & Discuss

Question 59

jamb 2009

If the decay constant of a radioactive substance is 0.231s-\(^1\), the half-life is?

A3.00 s

B0.12 s

C0.33 s

D1.50 s

View Explanation & Discuss

Question 60

jamb 2009

Cancerous cells can be destroyed by?

Aultraviolet rays

Balpha particules

Cx - rays

Dinfrared rays

View Explanation & Discuss

Question 61

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 62

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 63

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 64

jamb 2009

Which of the following is a secondary colour

Ablue

Borange

Cred

Dgreen

View Explanation & Discuss

Question 65

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 66

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 67

jamb 2009

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

A48.6°

B22.5°

C41.5°

D45.0°

View Explanation & Discuss

Question 68

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 69

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 70

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

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