2011 JAMB Physics Past Questions & Answers

Question 1

If the charge of electricity is K wh is N4, what is the cost of operating an electrical appliance rated 250 v,2 A for six hours?

Accepted Answer

B. N12

Answer

A. N28

Answer

C. N16

Answer

D. N24

Question 2

An object of mass 2 kg moves with a velocity of 10 ms1 round at circle of radius 4 m. Calculate the centripetal force on the object

Accepted Answer

C. 50 N

Answer

A. 25 N

Answer

B. 100 N

Answer

D. 40 N

Question 3

A man standing on a lift that is descending does not feel any weight because

Accepted Answer

C. the lift's acceleration is same as acceleration due to gravity

Answer

A. the inside of the lift is air tight

Answer

B. the lift is in vacuum

Answer

D. there is no gravitational pull on the man in the lift

Question 4

The correct expression for the potential at a point distance r from a charge q in an electric field is?

Accepted Answer

D. $\frac{q}{4πε_or}$

Answer

A. _q24πεor2

Answer

B. _q24πεor

Answer

C. _q4πεor2

Question 5

I. Density of the liquid. II. Depth below the surface of the liquid. III. Surface area of the liquid. In which of the statement above will pressure be dependent?

Accepted Answer

A. I and II only.

Answer

B. II and III only.

Answer

C. I, II and III only.

Answer

D. I and III only.

Question 6

The capacitance of a parallel plate capacitor is 20 μf in air and 60 μf in the presence of a dielectric. What is the dielectric constant?

Accepted Answer

C. 3.0

Answer

A. 0.3

Answer

B. 6.0

Answer

D. 2.0

Question 7

A cannon is fired from town X,after how long is the sound heard at a town Y 4.95 km away? [velocity of sound in the air = 330 $ms^{-1}$]

Accepted Answer

D. 15 s

Answer

A. 30 s

Answer

B. 10 s

Answer

C. 10 s

Question 8

A copper wire was subjected to a tensile stress of 7.7 x 10$^7$. Calculate the strain of the wire. [Young modules = 1.1 x 10$^11$ Nm$^{-2}$]

Accepted Answer

C. 7.0 x 10-4

Answer

A. 2. 0  x 10-5

Answer

B. 7.0 x 10-3

Answer

D. 2.2 x 10-4

Question 9

Which of the following electromagnetic waves has the highest frequency?

Accepted Answer

C. x - rays

Answer

A. utra - violet rays

Answer

B. radio waves

Answer

D. infrared - rays

Question 10

The bond between silicon and germanium is

Accepted Answer

A. covalent

Answer

B. ionic

Answer

C. dative

Answer

D. electrovalent

Question 11

A perfect emitter or absorber of radiant energy is a

Accepted Answer

B. black body

Answer

A. conductor

Answer

C. white body

Answer

D. red body

Question 12

I. High thermal capacity. II. High sensitivity. III.Easy readability. IV. Accuracy over a wide range of temperature From the statement above, the qualities of a good thermometer are

Accepted Answer

D. II, III and IV

Answer

A. I and II

Answer

B. I, II,III and IV

Answer

C. I, III and IV

Question 13

Which of the following could be effectively used to reduce friction?

Accepted Answer

B. grease

Answer

A. kerosene

Answer

C. water

Answer

D. petrol

Question 14

Two balls X and Y weighing 5 g and 50 kg respectively were thrown up vertically at the same time with a velocity of 100 ms1 .How will their positions be one second later?

Accepted Answer

D. X and Y both be 500 m from the point of throw

Answer

A. X and Y will be 500 m from each other

Answer

B. Y will be 500 m ahead of X

Answer

C. X will be 500 m ahead of Y

Question 15

I. change of state II. Diffusion III. Radiation IV. Osmosis which of the processes above can be explained using the kinetic theory?

Accepted Answer

D. I, II and IV

Answer

A. I, II,III and IV

Answer

B. I, II and III

Answer

C. I, III and IV

Question 16

In Homes, electrical appliances and lamps are connected in parallel because

Accepted Answer

B. independence switches can be used

Answer

A. Parallel connections do not heat up the wires

Answer

C. less current will be used

Answer

D. less voltage will be used

Question 17

Which of the following materials has an increase in resistance with temperature?

Accepted Answer

B. metals

Answer

A. water

Answer

C. wood

Answer

D. electrolyte

Question 18

The electrical properties of germanium can be altered drastically by the addition of impurity. This process is referred to as

Accepted Answer

D. dopping

Answer

A. saturation

Answer

B. bonding

Answer

C. amplification

Question 19

Under which of the following conditions do gases conduct electricity?

Accepted Answer

B. low pressure and high p.d

Answer

A. Low presssure and low p.d

Answer

C. high pressure an low p.d

Answer

D. high pressure and high p.d

Question 20

A machine is used to lift a load of 20 N through a height of 10 m. if the efficiency of the machine is 40%, how much work is done?

Accepted Answer

B. 500 J

Answer

A. 80 J

Answer

C. 300 J

Answer

D. 120 J

Question 21

An object weighs 22 kg in water and 30kg in air. what is the upthrust exerted by the liquid on the object. [g = 10 ms2]

Accepted Answer

D. 80 N

Answer

A. 50 N

Answer

B. 520 N

Answer

C. 220 N

Question 22

Which of the following types of waves needs a medium for propagation?

Accepted Answer

A. sound waves

Answer

B. light waves

Answer

C. radio waves

Answer

D. x - rays

Question 23

An image in a convex lens is upright and magnified 3 times. If the focal length of the lens is 15 cm, what is the object distance?

Accepted Answer

A. 10 cm

Answer

B. 25 cm

Answer

C. 16 cm

Answer

D. 14 cm

Question 24

The eclipse of the sun occurs when the

Accepted Answer

A. moon is between the sun and the earth

Answer

B. earth is between the sun and the moon

Answer

C. moon is not completely hidden in the earth's shadow

Answer

D. moon's umbra falls on some part of the earth

Question 25

A carpenter on top of a roof of 20.0m high dropped a hammer of mass 1.5 kg and it fell directly to the ground. the kinetic energy of the hammer just before hitting the ground is?[g = 10 $ms^{-2}$]

Accepted Answer

C. 300 J

Answer

A. 600 J

Answer

B. 150J

Answer

D. 450 J

Question 26

In measuring high frequency a.c, the instrument used is the

Accepted Answer

D. hot wire ammeter

Answer

A. d.c ammeter

Answer

B. moving coil  ammeter

Answer

C. moving iron ammeter

Question 27

Steam burn is more severe than that of boiling water because

Accepted Answer

B. steam possesses greater heat energy per unit mass

Answer

A. steam burn is independent of relative humidity

Answer

C. water boils at a higher temperature

Answer

D. steam burn is dependent on relative humidity

Question 28

The ground is always cold at night because the

Accepted Answer

B. earth radiates heat to the atmosphere at night

Answer

A. atmosphere absorbs the sun's energy at night

Answer

C. sun no longer shine at night

Answer

D. atmosphere reflects the sun's energy at night

Question 29

A length of wire has a frequency of 225Hz when stretched by a force of 225N. If the force increased to 324N, what is the new frequency of vibration?

Accepted Answer

A. 270 Hz

Answer

B. 512 Hz

Answer

C. 488 Hz

Answer

D. 356 Hz

Question 30

Which of the following is a property of steel?

Accepted Answer

C. it can be used for making permanent magnets

Answer

A. it cannot retain its magnetism longer than iron

Answer

B. it can be used for making temporary magnets

Answer

D. it can easily be magnetized and demagnetized

Question 31

If it takes an object 3s to fall freely to the ground from a certain height, what is the distance covered by the object?

Accepted Answer

C. 45 m

Answer

A. 90 m

Answer

B. 30 m

Answer

D. 60 m

Question 32

A radioactive isotope has a decay constant of 10-5s4. Calculate half life

Accepted Answer

C. 6.93 x104s

Answer

A. 6.93 x 10-5s

Answer

B. 6.93 x 105s

Answer

D. 6.93 x 10-4s

Question 33

When the human eye loses its power of accomodation, the defect is known as

Accepted Answer

B. presbyopia

Answer

A. short sightedness

Answer

C. astigmatism

Answer

D. long sightedness

Question 34

If a tube of small radius opened at both ends is placed in a liquid, the liquid will

Accepted Answer

C. falls below the liquid level if the liquid does not wet the glass

Answer

A. remain at the same level irrespective of whether the liquid wet the glass or not

Answer

B. fall below the liquid level if the liquid wets the glass

Answer

D. rise above the liquid level if the liquid does not wet the glass

Question 35

Two inductors of inductance 4 II and 8 II are arrange in series and a current of 10 A is passed through them. What is the energy stored in them?

Accepted Answer

A. 600 J

Answer

B. 50 J

Answer

C. 133 J

Answer

D. 250 J

Question 36

Three similar cells each of e.m.f 2 v and internal resistance 2Ω are connected in parallel, the total e.m.f and total internal resistance are respectively

Accepted Answer

B. 2 v, 0.7Ω

Answer

A. 6 v, 6.0Ω

Answer

C. 2 v, 6.0Ω

Answer

D. 6 v, 0.7Ω

Question 37

The phenomenon that shows that increase in pressure lowers the melting point can be observed in

Accepted Answer

D. regelation

Answer

A. sublimation

Answer

B. condensation

Answer

C. coagulation

Question 38

A block of aluminum is heated electrically by a 30 w heater if the temperature rises by 10°c in 5 minutes, the heat capacity of the aluminum is

Accepted Answer

A. 900 JK-1

Answer

B. 90 JK-1

Answer

C. 100 JK-1

Answer

D. 200 JK-1

Question 39

In an A.C circuit, the ratio of r.m.s value to peak value of current is

Accepted Answer

C. $ \frac{1}{\sqrt{2}} $

Answer

A. 2

Answer

B. $ \frac{1}{2} $

Answer

D. $ \sqrt{2} $

Question 40

If the threshold frequency for tungsten is 1.3 x 1015Hz, what is its work function? [H = 6.6 x 10-34 Js]

Accepted Answer

A. 8.58 x 10-19 J

Answer

B. 8.50 x 10-15 J

Answer

C. 8.58 x 10-17 J

Answer

D. 8.85 x 10-18

Question 41

Which of the following will be applied when a metal Y is used to electroplate another metal X in electrolysis?

Accepted Answer

D. Y is the anode and very high current is used

Answer

A. X is the anode and very high current is used

Answer

B. X is the anode and Y is the cathode

Answer

C. Y is the cathode and X is the anode

2011 JAMB Physics Past Questions

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