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43 questions

Question 1 of 20 43 total questions

Question 1

jamb 2013

The bond between silicon and germanium is

Adative

Bcovalent bond

Ctrivalent

Dionic

View Explanation & Discuss

Question 2

jamb 2013

The energy of a photo having a wavelength of 10^-10m is
(h= 6.63 x 10 ^-34Js, c =3.0 x 10 ⁸ms^-1)

A2.0 x 10 ^-15J

B1.7 x 10 ^-13J

C2.0 x 10 ^-12J

D1.7 x 10 ^-12J

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Question 3

jamb 2013

The particle nature of light is demonstrated by the

Aphotoelectric effect

Bspeed of light

Ccolours of light

Ddiffraction of light

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Question 4

jamb 2013

In photo-emission, the number of photo-electrons ejected per second depends on the?

Afrequency of the beam

Bwork function of the metal

Cthreshold frequency of the metal

Dintensity of the beam

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Question 5

jamb 2013

Calculate the energy of the third level of an atom if the ground state energy is - 24.8eV

A-9.20eV

B-8.20eV

C-2.75eV

D-1.75eV

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Question 6

jamb 2013

If a current of 2.5A flows through an electrolyte for 3 hours and 1.8g of a substance is deposited, what is the mass of the substance that will be deposited if a current of 4A flows through it for 4.8 hours?

A2.4g

B3.2g

C4.6g

D4.8g

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Question 7

jamb 2013

Induced emfs are best explained using

AOhm's law

BFaraday's law

CColomb's law

DLenz's law

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Question 8

jamb 2013

To convert a galvanometer to a voltmeter, a

Ahigh resistance is connected to it in series

Bhigh resistance is connected to it in parallel

Clow resistance is connected to it in parallel

Dlow resistance is connected to it in series

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Question 9

jamb 2013

When a charge moves through an electric circuit in the direction of an electric force, it

Agains both potential and kinetic energy

Bgains potential energy and lose kinetic energy

Closes potential energy and gains kinetic energy

Dloses both potential and kinetic energy

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Question 10

jamb 2013

An electric device is rated 2000W, 250V. Calculate the maximum current it can take

A9A

B8A

C7A

D6A

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Question 11

jamb 2013

A house has ten 40W and five 100W bulbs. How much will it cost the owner of the house to keep them lit for 10 hours if the cost of a unit is 5N?

AN90

BN50

CN45

DN5

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Question 12

jamb 2013

Which of the following obeys ohms laws?

Aelectroytes

Bmetals

Cdiode

Dglass

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Question 13

jamb 2013

A cell of emf 1.5V is connected in series with a 1Ω resistor and a current of 0.3A flows through the resistor. Find the internal resistance of the cell

A4.0Ω

B3.0Ω

C1.5Ω

D1.0Ω

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Question 14

jamb 2013

Capacitors are used in the induction coil to

Acontrol circuits

Bprevent distortion of electric fields

Cprevent electric sparks

Ddissipate energy

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Question 15

jamb 2013

Calculate the force acting on an electron of charge 1.5 x 10^-19C placed in an electric field of intensity 10⁵Vm^-1

A1.5x10^-11N

B1.5x10^-12N

C1.5x10^-13N

D1.5x10^-14N

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Question 16

jamb 2013

The angle of deviation of light of various colours passing through a triangular prism increases in the order

Ared → green → blue

Bgreen → violet → blue

Cblue → red → green

Dblue → green → red

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Question 17

jamb 2013

If the linear magnification of the objective and eyepiece convex lenses of a compound microscope are 4 and 7 respectively. Calculate the angular magnification of the microscope

C11

D28

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Question 18

jamb 2013

Total internal reflection will not occur when light travels from

Awater to air

Bwater into glass

Cglass to air

Dglass into water

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Question 19

jamb 2013

A ray of light passing through the centre of curvature of a concave mirror is reflected by the mirror at?

A0^o

B45^o

C90^o

D180^o

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Question 20

jamb 2013

A man 1.5m tall is standing 3m in front of a pinhole camera whose distance between the hole and the screen is 0.1m. What is the height of the image of the man on the screen?

A0.05m

B0.15m

C0.30m

D1.00m

View Explanation & Discuss

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