JAMB Physics Past Questions 2017

10 questions from the JAMB 2017 Physics paper, with answers and explanations. Tap "Show answer" under each one when you are ready.

JAMB 2017Question 1 · Electricity and Magnetism

Calculate the electric field intensity between two plates of potential difference

6.5 V

when separated by a distance of

35 cm

A. $18.57 N C^{- 1}$
B. $53.06 N C^{- 1}$
C. $2.28 N C^{- 1}$
D. $0.80 N C^{- 1}$

Show answer

Answer: A. $18.57 N C^{- 1}$

E=V/d= $\frac{6.5}{0.35}$ =18.57 $N C^{- 1}$ .

JAMB 2017Question 2 · Electricity and Magnetism

How can energy loss be minimized through Eddy-current?

A.By using high resistance wire
B.By using insulated soft iron wires
C.By using low resistance wires
D.Bu using turns of wires

Show answer

Answer: B. By using insulated soft iron wires

Using laminated, insulated soft iron reduces eddy current losses.

JAMB 2017Question 3 · Electronics and Alternating Current

Under what conditions are cathode rays produced in a discharge tube?

A.High pressure and low voltage
B.High pressure and high voltage
C.Low pressure and low voltage
D.Low pressure and high volatge

Show answer

Answer: D. Low pressure and high volatge

Cathode rays are produced in a discharge tube at low pressure and high voltage.

JAMB 2017Question 4 · General Physics and Measurement

Which of the following is a scalar quantity?

A.Tension
B.Weight
C.Impulse
D.Mass

Show answer

Answer: D. Mass

Mass is a scalar quantity.

JAMB 2017Question 5 · Heat and Thermodynamics

Which of the following surfaces will absorb radiant heat energy?

A.white
B.red
C.black
D.blue

Show answer

Answer: C. black

A black surface is the best absorber of radiant heat.

JAMB 2017Question 6 · Mechanics, Motion, and Energy

A block and tackle pulley arrangement has 6 pulleys in which an effort of

50 N

supports a load of

200 N

, calculate the efficiency of the machine

A.80.0%
B.76.6%
C.66.7%
D.60.7%

Show answer

Answer: C. 66.7%

M.A.= $\frac{200}{50}$ =4; efficiency=M.A./V.R.= $\frac{4}{6}$ =66.7%.

JAMB 2017Question 7 · Mechanics, Motion, and Energy

Calculate the time taken for a mango fruit that fall from the tree

20 m

to the ground [g =

10 m s^{- 2}

]

A. $10 s$
B. $5 s$
C. $4 s$
D. $2 s$

Show answer

Answer: D. $2 s$

t= $2 \times 20/10$ = $2 s$ .

JAMB 2017Question 8 · Nuclear and Modern Physics

Which of the following representations is correct for an atom X with 28 electrons and 30 neutrons?

A. $_{28}^{58} X$
B. $_{28}^{30} X$
C. $_{30}^{28} X$
D. $_{30}^{58} X$

Show answer

Answer: A. $_{28}^{58} X$

Mass number=28+30=58, atomic number=28, giving 58 over 28 X.

JAMB 2017Question 9 · Waves, Sound, and Optics

Which of the following is not an electromagnetic radiation?

A.x - ray
B.Radio waves
C.sunlight
D.sound waves

Show answer

Answer: D. sound waves

Sound waves are mechanical, not electromagnetic.

JAMB 2017Question 10 · Waves, Sound, and Optics

Determine the focal length of a thin converging lens if the power is 5.0 dioptres

A. $0.1 m$
B. $0.2 m$
C. $2.0 m$
D. $2.5 m$

Show answer

Answer: B. $0.2 m$

f=1/P= $\frac{1}{5}$ = $0.2 m$ .

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