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146 questions

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Question 61

jamb 2000

In a thermonuclear reaction, the total initial mass is 5.02 x \(10^{-{2}{7}}\)kg and the total final mass is 5.01 x \(10^{-{2}{7}}\)kg. The energy released in the process is
[c = 3.0 x \(10^8\) ms-1]

A9.0 x 10^-13J

B9.0 x 10^-12J

C9.0 x 10^-11J

D9.0 x 10^-10J

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Question 62

jamb 2000

In a pure semiconductor, the number of electrons in the conduction band is

Aless than the number of holes in the valence band

Bequal to the number of holes in the valence band

Cgreater than the number of holes in the valence band

Dtwice the number of holes in the valence band

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Question 63

jamb 2000

What optical instrument can best be constructed with converging lenses of focal lengths 50cm and 5cm?

ACompound microscope

BGalileo's telescope

CTerrestrial telescope

DAstronomical telescope

View Explanation & Discuss

Question 64

jamb 2000

A cell of internal resistance 0.01Ω can be measured accurately using the

AOhm meter

Bmetre bridge

Cpotentiometer

Delectroscope

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Question 65

jamb 2000

An electron of charge 1.6 x 10^-19C and mass 9.1 x 10^-31kg is accelerated between two metal plates with a velocity of 4 x 10⁷ms^-1, the potential difference between the plates is

A4.55 x 10³V

B4.55 x 10²V

C9.10 x 10¹V

D4.55 x 10¹V

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Question 66

jamb 2000

A projection lantern is used to give the image of a slide on a screen. If the image is 24 times as large as the slide and the screen is 72.0m from the projecting lens, what is the position of the slide from the lens?

A0.3m

B3.0m

C3.5m

D4.0m

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Question 67

jamb 2000

If a charged ion goes through combined electric and magnetic fields, the resultant emergent velocity of the ion is

AE/B

BEB

CB/E

DE - B

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Question 68

jamb 2000

A radio is operated by eight cells each of e.m.f. 2.0V connected in series. If two of the cells are wrongly connected, the net e.m.f. of the radio is

A8V

B10V

C12V

D16V

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Question 69

jamb 2000

The main reason for making the cover of a vacuum flask airtight is to prevent heat loss by

Aconvection

Bconduction

Cradiation

Devaporation

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Question 70

jamb 2000

A metal of mass 0.5kg is heated to 100°C and then transferred to a well-lagged calorimeter of heat capacity 80JK^-1 containing water of heat capacity 420JK^-1 at 15°C. If the final steady temperature of the mixture is 25°C, find the specific heat capacity of the metal.

A877Jkg^-1K^-1

B286Jkg^-1K^-1

C133Jkg^-1K^-1

D92Jkg^-1K^-1

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Question 71

jamb 2000

One end of a long wire is fixed while a vibrator is attached to the other end. When the vibrator is energized, the types of waves generated in the wire are

Astationary and longitudinal

Bstationary and transverse

Cprogressive and transverse

Dprogressive and longitudinal

View Explanation & Discuss

Question 72

jamb 2000

Dry
Day 1 - 30°C | Day 2 - 29°C | Day 3 - 25°C

Wet
Day 1 - 22°C | Day 2 - 22°C | Day 3 - 21°C

The reading above are for three consecutive days from a wet and dry bulb hygrometer. It can be concluded that the relative humidity for the three days

Adecreased steadily

Bremained unchanged

Cincreased steadily

Dwas least on Day 1

View Explanation & Discuss

Question 73

jamb 2000

A thin wire with heavy weights attached to both ends is hung over a block of ice resting on two supports. If the wire cuts through the ice block while the block remains solid behind the wire, the process is called

Acondensation

Bsublimation

Cregelation

Dfusion

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Question 74

jamb 2000

A boy observes a piece of stone at the bottom of a river 6.0m deep. If he looks from the surface of the river, what is the apparent distance of the stone from him? [Refractive Index of Water = 4/3]

A8.0m

B5.5m

C5.0m

D4.5m

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Question 75

jamb 2000

I. Coherence
II. Same frequency
III. Same wavelength
IV. Same Intensity

Which of the conditions above are necessary to produce interference fringes?

AI and III

BI, II and IV

CI, II and III

DII and III

View Explanation & Discuss

Question 76

jamb 2000

A quantity of water at 0°C is heated to about 30°C. At each degree rise in temperature, its density will

Arise steadily

Bfall steadily

Cfall then rise

Drise then fall

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Question 77

jamb 2000

Total internal reflection occurs when light moves from?

Aa dense medium to a less dense medium

Bair to water

Cwater to glass

Da less dense to a dense medium

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Question 78

jamb 2000

I. The frictional force is independent of the area of the surfaces in conduct
II. The frictional force depends on the nature of the surfaces in contact
III. The frictional force depends on the speed of sliding
IV. The frictional force is directly proportional to the normal reaction.

Which combination of the above is true of sliding friction?

AI, III and IV

BI, II and IV

CI, II and III

DII, III and IV

View Explanation & Discuss

Question 79

jamb 2000

A rope is being used to pull a mass of 10kg vertically upward. Determine the tension in the rope if, starting from rest, the mass acquires a velocity of 4ms\(^{-1}\) in 8s [g = 10ms\(^{-2}\)]

A5N

B50N

C95N

D105N

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Question 80

jamb 2000

A stream is flowing at 0.75ms\(^{-1}\) and a boat heading perpendicular for the stream landed at the opposite bank at an angle of 30°. Calculate the velocity of the boat.

A1.50ms^-1

B1.00ms^-1

C0.86ms^-1

D0.65ms^-1

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