JAMB Physics Past Questions 2014

10 questions from the JAMB 2014 Physics paper, with answers and explanations. Tap "Show answer" under each one when you are ready.

JAMB 2014Question 1 · Electricity and Magnetism

When a negatively charged rod is brought near the cap of a charged gold leaf electroscope which has positive charges, the leaf

A.Remains the same
B.Collapses
C.Collapses and diverges again
D.Diverges

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Answer: C. Collapses and diverges again

As the negative rod approaches, the positively charged leaves first collapse, then diverge again with induced charge.

JAMB 2014Question 2 · Electricity and Magnetism

PHCN measures its electrical energy in

A.W
B.KWh
C.Wh
D.J

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Answer: B. KWh

Electrical energy supplied is billed in kilowatt-hours (kWh).

JAMB 2014Question 3 · Electronics and Alternating Current

Which gas produces a red coloured light in a discharge tube?

A.Mercury
B.Argon
C.Air
D.Neon

Show answer

Answer: D. Neon

Neon gas produces a red glow in discharge tubes.

JAMB 2014Question 4 · General Physics and Measurement

Which of the following is NOT a Fundamental S.I unit?

A.Metre
B.Ampere
C.Newton
D.Second

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Answer: C. Newton

The newton is a derived SI unit (kg m/ $s^{2}$ ), not fundamental.

JAMB 2014Question 5 · Heat and Thermodynamics

The quantity of heat needed to raise the temperature of a body by

1 K

is the body's

A.Heat capacity
B.Internal energy
C.Specific heat capacity
D.Latent heat of fusion

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Answer: A. Heat capacity

Heat capacity is the heat needed to raise a body's temperature by $1 K$ .

JAMB 2014Question 6 · Heat and Thermodynamics

A glass bottle of initial volume

2 \times 1 0^{4}

c m^{3}

is heated from

2 0^{\circ} C

5 0^{\circ} C

. If the linear expansivity of glass is

9 \times 1 0^{- 6}

K^{- 1}

, the volume of the bottle at

5 0^{\circ} C

A. $20016.2 c m^{3}$
B. $20005.4 c m^{3}$
C. $20008.1 c m^{3}$
D. $20013.5 c m^{3}$

Show answer

Answer: A. $20016.2 c m^{3}$

Volume expansivity= $3 \times 9 \times 1 0^{-} 6$ = $2.7 \times 1 0^{- 5}$ ; deltaV=20000x2. $7 \times 1 0^{- 5} x 30$ = $16.2 c m^{3}$ ; new volume= $20016.2 c m^{3}$ .

JAMB 2014Question 7 · Mechanics, Motion, and Energy

An object of weight

8 kg

on earth is taken to a planet where acceleration due to gravity is one-third of its value on earth. The weight of the object on the planet is

A. $48 N$
B. $12 N$
C. $27 N$
D. $36 N$

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Answer: C. $27 N$

Weight on planet=(8x10)/3≈ $27 N$ .

JAMB 2014Question 8 · Mechanics, Motion, and Energy

A machine whose efficiency is 75% is used to lift a load of

1000 N

. Calculate the effort put in to the machine if it has a Velocity ratio of 4.

A. $343.32 N$
B. $233.33 N$
C. $333.33 N$
D. $334.33 N$

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Answer: C. $333.33 N$

Effort=Load/(efficiency x V.R.)=1000/(0.75x4)= $333.33 N$ .

JAMB 2014Question 9 · Nuclear and Modern Physics

When

_{82}^{210} P b

decays to

_{80}^{206} P b

, it emits

A.two alpha and two beta particles
B.an alpha particle
C.one beta particle
D.one alpha and one beta particle

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Answer: B. an alpha particle

Mass drops by 4 and atomic number by 2, consistent with emission of a single alpha particle.

JAMB 2014Question 10 · Waves, Sound, and Optics

A boy receives the echo of his clap reflected by a nearby hill

0.8 s

later. How far is he from the hill? [ speed of sound in air =

340 m s^{- 1}

A. $528 m$
B. $66 m$
C. $136 m$
D. $264 m$

Show answer

Answer: C. $136 m$

distance=vxt/2=340x0.8/2= $136 m$ .

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JAMB Physics Past Questions 2014

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