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46 questions

Question 1 of 20 46 total questions

Question 11

jamb 1995

What is the approximate critical angle for total internal reflection for diamond if the refractive index of diamond is 2.42?

A21^o

B22^o

C23^o

D24^o

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Question 12

jamb 1995

Total eclipse of the sun occurs when the

Aearth is between the moon and the sun

Bsun is between the moon and the earth

Cmoon is between the sun and the earth

Dozone layer is threatened

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Question 13

jamb 1995

The pitch of an acoustic device can be increased by

Aincreasing the frequency

Bincreasing the amplitude

Cdecreasing the loudness

Ddecreasing the intensity

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Question 14

jamb 1995

The difference between sound waves and light waves is that sound waves

Aare transverse while light waves are longitudinal

Brequire a medium to travel while light waves does not

Ccan be diffracted but light waves cannot

Dcannot be reflected but light waves can

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Question 15

jamb 1995

The wavelength of signals from a radio transmitter is 1500mm and the frequency is 200kHz. What is the wavelength for a transmitter operating at 100kHz?

A7500m

B300m

C75m

D15m

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Question 16

jamb 1995

Which of the following is the exclusive property of a transverse wave?

Adiffraction

Brefraction

Ccompression

Dpolarization

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Question 17

jamb 1995

A well-lagged bar of length 100cm has its ends maintained at 100oC and 40oC respectively. What is the temperature at a point 60cm from the hotter end?

A58^oC

B62^oC

C64^oC

D76^oC

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Question 18

jamb 1995

Which of the following statements give the TRUE difference between evaporation and boiling? i. Evaporation occurs at all temperatures while boiling occurs at a fixed temperature for a given pressure. ii. Evaporation is a surface phenomenon while boiling is an interior phenomenon. iii. Evaporation is affected by surface area while boiling is not.

Ai and ii only

Bi and iii only

Cii and iii only

Di, ii, iii.

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Question 19

jamb 1995

A quantity of ice at 10^oC is heated until the temperature of the heating vessel is 90^oC. Which of the following constants is NOT required to determine the quantity of heat supplied to the vessel?

Aspecific heat capacity of ice

Bspecific heat capacity of water

Cspecific latent heat of fusion

Dspecific latent heat of vaporization

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Question 20

jamb 1995

A temperature scale has a lower fixed point of 40mm and a upper fixed point of 200mm. What is the reading on this scale when a thermometer reads 60^oC?

A33.3mm

B36.0mm

C96.0mm

D136.0mm

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Question 21

jamb 1995

An electric kettle with negligible heat capacity is rated at 2000W. If 2.0kg of water is put in it, how long will it take the temperature of water to rise from 20^OC to 100^OC? [specific heat capacity of water = 4200Jkg^-1k^-1]

A420S

B336S

C168S

D48S

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Question 22

jamb 1995

The equation PxVyTz = constant in charles' law when

Ax = 1, y = -1, z = 1

Bx = 0, y = 1, z = -1

Cx = 1, y = 0, z = -1

Dx = 0, y = 1, z = 1

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Question 23

jamb 1995

A piece of wood floats inside water at room temperature with a fraction of it above the liquid surface. As the temperature of the water is raised, the part of the wood above the liquid will

Adecrease because the density of water decreases with temperature

Bincrease because the density of water decreases with temperature

Cdecreases because the density of water increases with water temperature

Dincrease because the density of water increases with temperature

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Question 24

jamb 1995

A rectangular metal block of volume 10\(^{-6}\)m\(^3\) at 273k is heated to 573k. If its coefficient of linear expansion is 1.2 x 10\(^{-5}\)k\(^{-1}\), the percentage change of it volume is

A1.5%

B1.1%

C0.4%

D0.1%

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Question 25

jamb 1995

Temperature is the measure of the

Aquantity of heat transferred into the molecules of an object

Bmean kinetic energy of the molecules of the object

Ckinetic energy of any individual molecule of the substance

Damount of work done by the molecules of the object

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Question 26

jamb 1995

The volume of an air bubble increases from the bottom to the top of a lake at constant temperature because

Aatmospheric pressure acts on the surface of the lake

Bpressure increases with depth

Cdensity remains constant with pressure

Dthe bubble experiences an upthrust

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Question 27

jamb 1995

A hydraulic press has a large circular piston of radius 0.8m and a circular plunger of radius 0.2m. A force of 500N is exerted by the plunger. Find the force exerted on the piston

A8000N

B4000N

C2000N

D31N

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Question 28

jamb 1995

The energy contained in a wire when it extended by 0.02m by a force 500 N is

A5J

B10J

C10³J

D10⁴

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Question 29

jamb 1995

Which of the following statements are TRUE about frictional force? i. it is always a disadvantage ii. it is sometimes a disadvantage iii. it always exist where there is a relative motion of two bodies that are in contact iv. it is sometimes very useful

Ai, iii only

Bi, iv only

Cii, iii only

Diii, iv only

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Question 30

jamb 1995

A vehicle of mass m is driven by an engine of power P from rest. Find the minimum time it will take to acquire a speed

A\(\frac{mv^2}{2p}\)

B\(\frac{mv^2}{p}\)

C\(\frac{mv}{p}\)

D\(\frac{mv}{2p}\)

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