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99 questions

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Question 31

jamb 2010

THe velocity of sound in air at 16oC is 340ms-1. What will it be when the pressure is doubled and its temperature raised to 127ºC?

A400 ms^-1

B4,000 ms^-1

C8,000 ms^-1

D160,000 ms^-1

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Question 32

jamb 2010

Two metals P and Q of length l1 and l2 are heated through the same temperature difference. If the ratio of the linear expansivities of P to Q is 2:3 and the ratio of lengths is 3:4. What is the ratio of increase in length of P to Q?

A7:5

B5:7

C1:2

D2:1

View Explanation & Discuss

Question 33

jamb 2010

A bob of weight 0.1 N hangs from a massless string of length 50 cm. A variable horizontal force which increase from zero is applied to pull the bob until the string makes an angle of 60o with the vertical. The work done is?

A0.500 J

B0.250 J

C0.050 J

D0.025 J

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Question 34

jamb 2010

The diagram above represents balls in an undulating surface. Which of the following option represents positions of stable equilibrium?

AIII, IV and VIII

BII, V and VIII

CIII, VI and IX

DI, IV and VII

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Question 35

jamb 2010

The diagram above shows a velocity - time graph. The statement that is true about this motion is that the car?

Ahas no acceleration between point F and G

Bdecelerates between F and H

Chas a constant soeed between points E and F

DAccelerates between points F and G

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Question 36

jamb 2010

Which of the following is a pure semiconductor?

Acarbon

Bsilicon

Ctransistor

Dphosphorus

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Question 37

jamb 2010

Transistors are used for the?

Arectification of signals

Bconversion of a.c to d.c

Camplification of signals

Dconversion of d.c to a.c

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Question 38

jamb 2010

The ground state energy for the hydrogen atom is 5.44 x 10\(^{-19}\)J. If an electron drops from zero energy to the ground state, calculate the frequency of the emitted radiation. [h = 6.6 x 10\(^{-34}\) Js]

A5.0 x 10¹⁶ Hz

B2.0 x 10¹⁶ Hz

C5.0 x 10¹⁵ Hz

D2.0 x 10¹⁵ Hz

ENo correct option

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Question 39

jamb 2010

In a discharge tube, most of the gas is pumped out so that electricity is conducted at?

Alow voltage

Bsteady voltage

Chigh pressure

Dlow pressure

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Question 40

jamb 2010

In alternating current circuit at resonance, the angle of lead or lag is?

Aπ°

B(π)/2°

C(π)/3°

D0°

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Question 41

jamb 2010

Two inductors of inductance 5 mll and 15 mll are connected in series and a current of 5A flows through them. the total energy stored in the inductor is?

A500.0J

B250.0J

C62.5J

D50.0J

Eno correct option

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Question 42

jamb 2010

A galvanometer with full-scale deflection of 10 mA is to be converted to a voltmeter with full-scale deflection of 5v. if a series resistance of 498Ω is used for the conversion, the resistance of the galvanometer is ?

A1Ω

B2Ω

C5Ω

D10Ω

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Question 43

jamb 2010

Power supply is transmitted at a very high voltage and low current in order to?

Amake pass through the trasformers

Bincrease the power supply

Cmake it travel fast

Dprevent overheating of the coil

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Question 44

jamb 2010

When a positively charged rod is brought nearer the cap of a positively charged electroscope, the leaves divergence will?

Abe induced

Bconverge

Cdiverge

Dremain constant

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Question 45

jamb 2010

Dispersion occurs when white light passes through a glass prism because of the?

Adifferent hidden colours in the glass

Bdifferent speeds of the colour in the glass

Cdefects in the glass

Dhigh density of the glass

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Question 46

jamb 2010

Which of the following is used for the correction of short sightedness?

Aconvex lens

Bconcave lens

Cconvex mirror

Dconcave mirror

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Question 47

jamb 2010

An object is embedded in a block of ice, 10 cm below the plane surface. if the refractive index of the ice is 1.50, the apparent depth below the surface is?

A2.50 cm

B6.67 cm

C7.50 cm

D7.63 cm

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Question 48

jamb 2010

An object 4 cm high is placed 15 cm from a concave mirror of focal length 5 cm. The size of the image is?

A2 cm

B3 cm

C4 cm

D5 cm

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Question 49

jamb 2010

In comparing the camera and the human eye, the film of the camera function as the?

Aretina

Biris

Ccornea

Dpupil

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Question 50

jamb 2010

During a thunderstorm, the sound is heard over a long time. this phenomenon is referred to as?

Adiffraction of sound

Brefraction of sound

Csuperposition

Dreveraberation

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