Physics 2016 JAMB Past Questions

1.Myopic defects in the human eye can be corrected through the use of a

A. Concave Mirror
B. Concave lens
C. Prism
D. Convex lens

Correct Answer: Option B

2.A charged particle is moving in a uniform magnetic field. if the direction of motion of the charged particle is parallel to the magnetic field, the path of the charge will

A. Be a straight line
B. Curve inwards
C. Be a parabola
D. Curve outwards

Correct Answer: Option A

3.What happens to a water pool on a day when the humidity of the air is very low?

A. Temperature decreases
B. Slow evaporation
C. Temperature increases
D. Rapid evaporation

Correct Answer: Option D

4.A satellite moves in a circular orbit of radius 4R round the earth. The acceleration of the satellite in terms of g is

A. $\frac{g}{16}$

\frac{g}{4}

\frac{4}{g}

\frac{16}{g}

Correct Answer: Option A

Explanation

\frac{g}{R^{2}}

\frac{g}{4^{2}}

\frac{g}{16}

I.Chemical II.Sound III.Electricity

Which of the above forms of energy can directly be converted to light energy?

A. I and II only
B. II and III only
C. I, II and III
D. I and III only

Correct Answer: Option D

6. If the distance between the object and the pinhole of a pinhole camera is reduced by half the size of the image of the object

A. Is quadrupled
B. Is halved
C. Remains the same
D. Is double

Correct Answer: Option D

7.An object is placed 15cm in front of a plane mirror. If the mirror is moved further 5cm away from the object and the image is

A. 80cm
B. 40cm
C. 50cm
D. 70cm

Correct Answer: Option B

8.Which of the following statements is correct about a machine?

A. Efficiency of a machine is always greater than I
B. Efficiency decreases with an increase in friction
C. Velocity ratio depends on friction
D. Mechanical advantage increases with an increase in friction

Correct Answer: Option B

9.The instrument used to view stars is the

A. Prism binoculars
B. Telescope
C. Film projector
D. Microscope

Correct Answer: Option B

10. What is the angular magnification of a telescope having objective and eyepiece lenses of a focal lengths 30cm and 3cm respectively?

A. 60
B. 10
C. 30
D. 90

Correct Answer: Option B

Explanation

M =

\frac{y}{x}

\frac{30}{3}

= 10

11. A wire of length 10m is cooled from 50^oC to 10^oC. Calculate the decrease in the length of the wire. [c = 3 x 10^-5K^-1]

A. 1.8 x 10^-4m
B. 1.5 x 10^-4m
C. 1.5 x 10^-3m
D. 1.8 x 10^-3m

Correct Answer: Option C

12.When an athlete perspires after running, he loses heat through

A. Evaporation
B. Conduction
C. Radiation
D. Convection

Correct Answer: Option A

13.The rate of cooling of a heated quantity of liquid in an enclosure depends on the

A. Pressure of the liquid
B. Temperature in the enclosure
C. Pressure of the enclosure
D. Volume of the liquid

Correct Answer: Option B

14.The heat required to raise a mass of a substance through 1K is known as

A. Specific heat capacity
B. Specific latent heat of vaporization
C. Capacity latent heat of fusion
D. Heat capacity

Correct Answer: Option D

15.A boy in a barber's shop sits between two parallel mirrors. The number of images observed by him will be

A. Infinite
B. Ten
C. Eight
D. Forty

Correct Answer: Option A

16.Semiconductor is a class of solid whose conductivity increases with an increase in

A. Pressure
B. Temperature
C. Current
D. Voltage

Correct Answer: Option B

17.Which of the following statements is NOT correct?

A. Brownian motion is an evidence of the particle nature of matter
B. Atoms combine to form molecules
C. The molecules of matter are in constant motion
D. matter is made up of molecules

Correct Answer: Option C

18.A dynamo primarily converts

A. Mechanical energy into electrical energy
B. Electrical energy into kinetic energy
C. Potential energy into kinetic energy
D. Kinetic energy into potential energy

Correct Answer: Option A

19.A saturated vapour pressure of a liquid increases when the

A. Temperature of a liquid increases
B. Volume of the liquid increases
C. Volume of the liquid decreases
D. Temperature of the liquid decreases

Correct Answer: Option A

20.What force has to be exerted on a mass 60kg to give it an acceleration of 10ms^-2 vertically upwards?
[g = 10ms^-2

A. 300N
B. 600N
C. 1200N
D. 400N

Correct Answer: Option C

Explanation

F = Ma + mg = 60 x 10 x 60 x 10 = 1200N

21.A metre rule is pivoted at its mid-point with a vertical force of 10N hanging from the distance 30cm from the mid-point. At what distance must a 15N force hang to balance the ruler horizontally?

A. 30cm
B. 10cm
C. 20cm
D. 25m

Correct Answer: Option C

Explanation

Clockwise moment = Anti-clockwise moment
10 x 30 = 15 x X
X = 20cm

22.A projectile is fired from the ground level with a velocity of 300ms-1 at an angle of a 30o to the horizontal.

Calculate the time taken to reach the maximum height?
[g = 10ms-2]

A. 30s
B. 20s
C. 25s
D. 15s

Correct Answer: Option D

Explanation

The total time of flight is given as

T = \frac{2 u s i n θ}{g}

Hence, time to maximum height is half of the total time of flight,
t =

\frac{u s i n θ}{g}

\frac{300 sin 30}{10}

= 15s

23.A train with an initial velocity of 20ms^-1 is subjected to a uniform deceleration of 2ms^-2. The time required to bring the train to a complete halt is

A. 40s
B. 10s
C. 20s
D. 5s

Correct Answer: Option B

Explanation

t =

\frac{v - u}{a}

\frac{20 - 0}{2}

= 10s

24. Which of the following electromagnetic waves has the shortest wavelength?

A. Visible Light
B. Ultraviolet rays
C. Infrared rays
D. Gamma rays

Correct Answer: Option D

25.A radioactive isotope has a decay constant of 10^-6s^-1.
Calculate its half - life?

A. 5.93 x 10⁶s
B. 6.93 x 10⁷s
C. 6.93 x 10⁹s
D. 5.93 x 10⁷s

Correct Answer: Option B

Explanation

t_1/2 =

\frac{0.693}{γ}

\frac{0.693}{10^{-} 6}

= 6.93 x 10⁷

26. Which of the following waves is both transverse and mechanical?

A. Water waves
B. Radio waves
C. Sound waves
D. X-rays

Correct Answer: Option A

27. Calculate the temperature of 6 moles of an ideal gas at a pressure of 7.6 x 10⁶Nm^-2 with a volume of 10^-3m³.

[R = 8.3jmol^-1K^-1]

A. 201^oC
B. 126^oC
C. 153^oC
D. 185^oC

Correct Answer: Option C

Explanation

T =

\frac{P V}{n R}

\frac{7.6 x 10^{6} x 10^{-} 3}{6 x 8.3}

= 153^oC

28. The relative density of a liquid is the ratio of the

A. Mass of water to the mass of an equal volume of liquid
B. Upthrust in the liquid to the upthrust in water
C. Density of water to the density of the liquid
D. Upthrust in water to the upthrust in the liquid

Correct Answer: Option B

29. What will happen to the pressure of a gas if its temperature is reduced to -273^oC?

A. It will decrease
B. it will drop to zero
C. It will increase
D. It will remain constant

Correct Answer: Option B

30. Which of the following does Not use magnetic effect of current to function?

A. Lead acid accumulator
B. An electric bell
C. A moving coil galvanometer
D. A telephone receiver

Correct Answer: Option A

31. Vapour is said to be saturated on top of an enclosed liquid if _________

A. The rate of condensation is greater than that of vapourization
B. The rate of condensation is equal to that of vapourization
C. There is neither condensation nor vaporization of the liquid
D. The rate of condensation is less that that of vaporization

Correct Answer: Option B

32. A pool of water appears to be 1.00m deep when viewed vertically from above. What is the actual depth of the pool?

[Refractive index of water = 1.33]

A. 13.300m
B. 0.750m
C. 1.013m
D. 1.330m

Correct Answer: Option D

Explanation

n =

\frac{Read depth}{Apparent depth}

= 1.33 =

\frac{R d}{1}

Rd = 1.33 x 1 = 1.330m

33. Shadows and eclipse result from the

A. Reflection of light
B. Rectilinear propagation of light
C. Diffraction of light
D. Refraction of light

Correct Answer: Option B

34. Which of the following is obtained when a magenta is mixed with green colour?

A. Yellow
B. Blue
C. White
D. Red

Correct Answer: Option C

35. Which of the following instruments can be used to measure current in an a.c circuit?

A. Hot wire ammeter
B. Moving coil ammeter
C. Tangent galvanometer
D. Moving coil galvanometer

Correct Answer: Option D

36.Which of the following statements about wave motion is correct?

A. Electromagnetic waves are transverse
B. Transverse waves do not require a medium for propagation
C. Longitudinal waves vibrate perpendicular to the direction of travel
D. All mechanical waves are longitudinal

Correct Answer: Option A

37.A satellite revolving around the earth is kept on its orbit by

A. Centripetal forces only
B. Centripetal and frictional forces
C. Centrifugal forces only
D. Centripetal and centrifugal forces

Correct Answer: Option D

38. A manometer is an instrument used for measuring

A. Relative density of liquid
B. Pressure in liquids and gases
C. Humidity
D. Atmospheric pressure

Correct Answer: Option B

Explanation

a manometer is used to measure pressure in liquids and gases. Manometer gauges measure the pressure of gases and vapors from atmospheric to about 1 Pa by balancing the force exerted by the gas or vapor against the weight of a column of liquid, usually mercury, water, or oil.

39. A body which weighs 50N in air displaces 3.7kg of water when partially immersed in water. Calculate the upthrust on the body?

A. 8.7N
B. 37.0N
C. 87.0N
D. 13.0N

Correct Answer: Option B

Explanation

Upthrust = Weight or water displaced
= 3.7 x 10 = 37N

40. The impulse of a force is deduced from Newton's second law as

A. F = ma
B. F = m( $\frac{v - u}{t}$

C. F = mg
D. F = mv - mu

Correct Answer: Option B

41.Boiling occurs when the vapour pressure of a liquid is

A. At the evaporation point
B. Less than the atmospheric pressure
C. Greater than the atmospheric pressure
D. Equal to the atmospheric pressure

Correct Answer: Option D

42. If the magnification of a virtual image formed by an object 10cm from a convex less is 3, then the focal length of the lens is

A. 10cm
B. 20cm
C. 25cm
D. 15cm

Correct Answer: Option D

Explanation

M =

\frac{v}{u}

= 3 =

\frac{v}{30}

. V = 30m

\frac{1}{u}

\frac{1}{v}

\frac{1}{f}

\frac{1}{10}

\frac{1}{30}

\frac{1}{f}

\frac{3 - 1}{30}

\frac{1}{f} f = \(\frac{30}{2}

= 15cm

43.An electron in a hydrogen atom makes a transition from the ground level to the third level. If the energy at the ground level,calculate the energy at the third level.

[h = 6.6 x 10^-34Js; f = 10¹⁵Hz]

A. 1.41eV
B. 1.71eV
C. 1.61eV
D. 1.51eV

Correct Answer: Option D

Explanation

E =

\frac{E_{o}}{n^{2}}

\frac{13.6}{3^{2}}

\frac{13.6 e V}{9}

= 1.51eV

In the diagram above, which of the following velocity-time graphs shows uniform acceleration of a body from rest?

A. C
B. D
C. B
D. A

Correct Answer: Option C

Explanation

See the velocity-time graph.

In the diagram above, the neutral point is at

A. R
B. X
C. S
D. P

Correct Answer: Option B

From the diagram above, the measuring accuracy of the micrometer screw gauge is

A. 4.78mm
B. 4.16mm
C. 4.66mm
D. 4.70mm

Correct Answer: Option B

In the diagram above, the direction of the force between N and S in the magnetic field is

A. MP
B. SN
C. NS
D. PM

Correct Answer: Option C

48. Which of the following statements is Not true about atoms?

A. Atom of different elements have different atomic weights
B. The mass of an atom is concentrated in the nucleus
C. An atom is made up of a nucleus and number of electrons
D. Atoms of all elements are identical

Correct Answer: Option D

49. The frequency of beats produced when two tunning forks of frequencies 258Hz and 270Hz are sounded close to each other

A. 6Hz
B. 264Hz
C. 528Hz
D. 12Hz

Correct Answer: Option D

Explanation

Beat = f₂ - f₁ = 270 - 258 = 12Hz

50. Calculate the inductance of a coil of resistance 30

Ω

connected to a 100V a.c source if the coil draws an r.m.s current of 2A

A. 0.60H
B. 2.50H
C. 1.25H
D. 0.04H

Correct Answer: Option D

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