JAMB Physics Past Questions 2013

10 questions from the JAMB 2013 Physics paper, with answers and explanations. Tap "Show answer" under each one when you are ready.

JAMB 2013Question 1 · Electricity and Magnetism

Calculate the force acting on an electron of charge

1.5 \times 1 0^{- 19} C

placed in an electric field of intensity 10

5 V m^{- 1}

A. $1.5 \times 1 0^{- 11} N$
B. $1.5 \times 1 0^{- 12} N$
C. $1.5 \times 1 0^{- 13} N$
D. $1.5 \times 1 0^{- 14} N$

Show answer

Answer: D. $1.5 \times 1 0^{- 14} N$

$F = q E = 1.5 \times 1 0^{- 19} \times 1 0^{5} = 1.5 \times 1 0^{- 14}$ N.

JAMB 2013Question 2 · Electricity and Magnetism

A house has ten

40 W

and five

100 W

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

5 N

A.N90
B.N50
C.N45
D.N5

Show answer

Answer: C. N45

Energy=10x40x10+5x100x10= $9000 W h$ = $9 kW h$ ; cost=9x5=N45.

JAMB 2013Question 3 · Electricity and Magnetism

Induced emfs are best explained using

A.Ohm's law
B.Faraday's law
C.Colomb's law
D.Lenz's law

Show answer

Answer: B. Faraday's law

Faraday's law explains the magnitude of induced emf.

JAMB 2013Question 4 · Heat and Thermodynamics

Calculate the length which corresponds to a temperature of

2 0^{\circ} C

if the ice and steam points of an unguarded thermometer are

400 mm

apart

A. $20 mm$
B. $30 mm$
C. $60 mm$
D. $80 mm$

Show answer

Answer: D. $80 mm$

Length=( $\frac{20}{100}$ )x400= $80 mm$ .

JAMB 2013Question 5 · Heat and Thermodynamics

Steam from boiling water causes more damage on the skin than does boiling water because

A.water has a high specific heat
B.steam has latent heat of fusion
C.the steam is at a highter temperature than the water
D.steam brings heat more easily by convection

Show answer

Answer: B. steam has latent heat of fusion

Steam carries additional latent heat, delivering more energy to the skin than boiling water alone.

JAMB 2013Question 6 · Mechanics, Motion, and Energy

A simple pendulum of length

0.4 m

has a period of

2 s

. What is the period a similar pendulum of length

0.8 m

at the same place?

A. $8 s$
B. $4 s$
C.2 $2 s$
D. $2 s$

Show answer

Answer: C. 2 $2 s$

T proportional to $L$ : T2=2x $0.8/0.4$ =2x $2$ .

JAMB 2013Question 7 · Mechanics, Motion, and Energy

If a pump is capable of lifting

5000 kg

of water through a vertical height of

60 m

15 min

, the power of the pump is

A. $2.25 \times 1 0^{5} W$
B. $2.5 \times 1 0^{4} W$
C. $3.3 \times 1 0^{3} W$
D. $3.3 \times 1 0^{2} W$

Show answer

Answer: C. $3.3 \times 1 0^{3} W$

$P = \frac{m g h}{t} = \frac{( 5000 ) ( 10 ) ( 60 )}{15 \times 60} \approx 3.3 \times 1 0^{3} W$ .

JAMB 2013Question 8 · Nuclear and Modern Physics

The energy of a photo having a wavelength of 10

- 10 m

is (h=

6.63 \times 1 0^{- 34} J s

, c =

3.0 \times 1 0^{8} m s^{- 1}

)

A. $2.0 \times 1 0^{- 15} J$
B. $1.7 \times 1 0^{- 13} J$
C. $2.0 \times 1 0^{- 12} J$
D. $1.7 \times 1 0^{- 12} J$

Show answer

Answer: A. $2.0 \times 1 0^{- 15} J$

$E = \frac{h c}{λ} = \frac{6.63 \times 1 0 ^{- 34} \times 3 \times 1 0 ^{8}}{1 0 ^{- 10}} = 2.0 \times 1 0^{- 15}$ J.

JAMB 2013Question 9 · Waves, Sound, and Optics

A wave that travels through stretched strings is known as

A.electromagnetic wave
B.micro wave
C.mechanical wave
D.seismic wave

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Answer: C. mechanical wave

Waves on a stretched string are mechanical waves.

JAMB 2013Question 10 · Waves, Sound, and Optics

A man

1.5 m

tall is standing

3 m

in front of a pinhole camera whose distance between the hole and the screen is

0.1 m

. What is the height of the image of the man on the screen?

A. $0.05 m$
B. $0.15 m$
C. $0.30 m$
D. $1.00 m$

Show answer

Answer: A. $0.05 m$

Image height=1.5x( $\frac{0.1}{3}$ )= $0.05 m$ .

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