JAMB UTME - Physics - 2014 | Green Bridge CBT

Ibeere 1 Ìròyìn

In a compound microscope, the objective and the eye piece focal lengths are

At infinity

Long

Short

he same

Structure Of The Atom (Nigeria Only)

Wo Idahun

Ibeere 2 Ìròyìn

The focal length of a concave mirror is 2.0cm. If an object is placed 8.0cm from it, the image is at

2.7m

2.0m

2.3m

2.5m

Awọn alaye Idahun

\frac{1}{U} + \frac{1}{V} = \frac{1}{f}

$\frac{1}{8} + \frac{1}{V} = \frac{1}{2}$

$V = \frac{8}{3}$

$V = 2.7 c m$

Ka ìwé ẹ̀kọ́ nípa Structure Of The Nucleus (WAEC)

Structure Of The Nucleus

Wo Idahun

Ibeere 3 Ìròyìn

Which type of motion do the wheels of a moving car undergo?

Vibratory and translational motion

Random and translational motion

Rotational mand oscillatory motion

Translational and rotational motion

Simple Harmonic Motion

Motion

Wo Idahun

Ibeere 4 Ìròyìn

Calculate the escape velocity of a satellite launched from the earth's surface if the radius of the earth is 6.4x106m

25.3kms-1

4.2kms-1

4.0kms-1

11.3kms-1

Measurements And Units

Wo Idahun

Ibeere 5 Ìròyìn

The energy in the nucleus of atoms produce heat which can be used to generate

Kinetic energy

Mechanical energy

Electrical energy

Potential energy

Heat Energy

Induction

Wo Idahun

Ibeere 6 Ìròyìn

The magnitude of the angle of dip at the equator is

360 Deg

0 Deg

90 Deg

180 Deg

Wo Idahun

Ibeere 7 Ìròyìn

A wheel and an axle is used to raise a load whose weight is 800N when an effort of 250N is applied. If the radii of the wheel and axle are 800mm and 200mm respectively, the efficiency of the machine is

90%

80%

85%

87%

Awọn alaye Idahun

VR = 800/200 = 4

E f f i c i e n c y = \frac{M A}{V R} \times \frac{100}{1}

$E f f i c i e n c y = \frac{L}{E} \times \frac{1}{V R} \times \frac{100}{1}$

$E f f i c i e n c y = \frac{800}{250} \times \frac{1}{4} \times \frac{100}{1}$

= 78.74%
= 80%

Ka ìwé ẹ̀kọ́ nípa Simple Machines (JAMB)

Simple Machines

Wo Idahun

Ibeere 8 Ìròyìn

When $ {}^{210}_{82}\mathrm{Pb} $ decays to $ {}^{206}_{80}\mathrm{Pb} $, it emits

two alpha and two beta particles

an alpha particle

one beta particle

one alpha and one beta particle

Structure Of The Atom (Nigeria Only)

Wo Idahun

Ibeere 9 Ìròyìn

An object of mass 20kg is released from a height of 10m above the ground level. The kinetic energy of the object just before it hits the ground is

200J

4000J

2000J

500J

Awọn alaye Idahun

The kinetic energy of the object just before it hits the ground is 2000J. We can use the principle of conservation of energy to solve this problem. When the object is released from a height of 10m above the ground level, it has gravitational potential energy which is given by: PE = mgh where: m is the mass of the object g is the acceleration due to gravity h is the height of the object above the ground level Substituting the given values, we get: PE = (20 kg)(9.8 m/s^2)(10 m) = 1960 J As the object falls towards the ground, its potential energy is converted into kinetic energy. At the point just before it hits the ground, all of its potential energy will have been converted into kinetic energy. The kinetic energy is given by: KE = 1/2 mv^2 where: m is the mass of the object v is the velocity of the object To find the velocity of the object just before it hits the ground, we can use the principle of conservation of energy again. The total energy of the system (object + Earth) is conserved, so the potential energy at the top of the fall is equal to the sum of the kinetic and potential energies just before impact. Therefore, we can write: PE at the top = KE just before impact + PE just before impact We know that the PE at the top is equal to 1960 J, and the PE just before impact is zero (since the object is at ground level). Therefore: 1960 J = 1/2 (20 kg) v^2 Solving for v, we get: v = √(2(1960 J)/(20 kg)) = 20 m/s Substituting the value of v into the equation for kinetic energy, we get: KE = 1/2 (20 kg) (20 m/s)^2 = 2000 J Therefore, the kinetic energy of the object just before it hits the ground is 2000 J.

Ka ìwé ẹ̀kọ́ nípa Newton’s Laws Of Motion (WAEC)

Ka ìwé ẹ̀kọ́ nípa Work, Energy And Power (WAEC)

Newton’s Laws Of Motion

Work, Energy And Power

Wo Idahun

Ibeere 10 Ìròyìn

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

Remains the same

Collapses

Collapses and diverges again

Diverges

Electromagnetic Field (Part 2)

Electrostatics

Wo Idahun

Ibeere 11 Ìròyìn

If a metal wire 4m long and cross-sectional area 0.8 mm2 has a resistance of 60, find the resistivity of the wire

5.3x10-7

3.0x10-5

1.2x10-6

3.2x10-6

Wo Idahun

Ibeere 12 Ìròyìn

The melting point of a substance is equivalent to its

Vapour Pressure

Solidification Temperature

Liquidification Temperature

Solidification Pressures

Change Of State

Vapours

Wo Idahun

Ibeere 13 Ìròyìn

One of the conditions necessary for an object to be in equilibrium when acted upon by a number of parallel forces is that the vector sum of the forces is

Average

Zero

Negative

Positive

Equilibrium Of Forces

Wo Idahun

Ibeere 14 Ìròyìn

A car accelerates uniformly from rest at 3ms-2. its velocity after traveling a distance of 24m is

12ms-1

144ms-1

72ms-1

36ms-1

Awọn alaye Idahun

V2 = U2 x 2ax
V2 = 0 x 2(3)(24)
V2 = 144
V =

\sqrt{144}

V = 12ms-1

Ka ìwé ẹ̀kọ́ nípa Motion (JAMB)

Motion

Wo Idahun

Ibeere 15 Ìròyìn

The equation PaVbTc= constant reduces to Charles Law if

a=1, b=1and c=0

a=1, b=0 and c=-1

a=0, b=1 and c=1

a=0, b=1 and c=-1

Temperature And Its Measurement

Wo Idahun

Ibeere 16 Ìròyìn

The maximum power transfer occur in a cell when the external resistance is

Twice the internal resistance of the cell

The same as the internal resistance of the cell

Greater than the internal resistance of the cell

Less than the internal resistance of the cell

Current Electricity

Electric Cells

Wo Idahun

Ibeere 17 Ìròyìn

When an atom undergoes a beta decay, the atomic number of the nucleus

Remains unchanged

Decreases by one

Increases by one

Becomes zero

Structure Of The Atom (Nigeria Only)

Wo Idahun

Ibeere 18 Ìròyìn

What is the equivalent of 20K in Celsius scale?

20oC

293oC

68oC

36oC

Temperature And Its Measurement

Wo Idahun

Ibeere 19 Ìròyìn

A glass bottle of initial volume 2 x 104 cm3 is heated from 20oC to 50oC. If the linear expansivity of glass is 9 x 106K-1, the volume of the bottle at 50oC is

20016.2cm3

20005.4cm3

20008.1cm3

20013.5cm3

Wo Idahun

Ibeere 20 Ìròyìn

In a common emitter configuration, the output voltage is through the

Resistor

Base

Collector

Emitter

Electrostatics

Wo Idahun

Ibeere 21 Ìròyìn

A machine whose efficiency is 75% is used to lift a load of 1000N. Calculate the effort put in to the machine if it has a Velocity ratio of 4.

343.32N

233.33N

333.33N

334.33N

Awọn alaye Idahun

\frac{M A}{V R} \times \frac{100}{1} = e f f i c i e n c y

$\frac{L}{E} \frac{1}{V R} \times \frac{100}{1} = 75$

$\frac{1000}{E} \frac{1}{4} \times \frac{100}{1} = 75$

$E = \frac{250 \times 100}{75}$

E = 333.3N

Ka ìwé ẹ̀kọ́ nípa Simple Machines (JAMB)

Simple Machines

Wo Idahun

Ibeere 22 Ìròyìn

The temperature at which the water vapour present in the air is just sufficient to saturate air is

Boiling point

Ice point

Saturation point

Dew point

Temperature And Its Measurement

Wo Idahun

Ibeere 23 Ìròyìn

What is the least possible error encountered when taking measurement with a meter rule?

0.1mm

1.0mm

0.5mm

0.2mm

Measurements And Units

Wo Idahun

Ibeere 24 Ìròyìn

What happens when three coplanar non-parallel forces are in equilibrium?

Their lines of action are parallel.

They are represented in magnitude only

They are represented in direction only

Their lines of action meet at a point

Scalars And Vectors

Simple Harmonic Motion

Equilibrium Of Forces

Wo Idahun

Ibeere 25 Ìròyìn

A circuit has a resistance of 200?. The resistance of the circuit can be reduced to 120? when

A 300Ω resistor is connected to it in parallel

An 80Ω resistor is conneceted to it in series

A 150Ω resistor is connected to it in parallel

A 240Ω resistor is connected to it in series

Wo Idahun

Ibeere 26 Ìròyìn

When a telescope is in normal use, the final image is at

Infinity

The focus

The radius of curvature

The near point

Optical Instruments

Wo Idahun

Ibeere 27 Ìròyìn

Calculate the mass of the copper deposited during electrolysis when a current of 4A passes through a copper salt for 2 hours. [Ece of Copper z=3.3x10-7kgC-1]

2.9x105kg

9.5x10-7kg

9.5x10-3kg

2.9x104kg

Heat Energy

Wo Idahun

Ibeere 28 Ìròyìn

I Electrical potential, II Torque, III Kinetic Energy, IV Momentum. Which of the quantities listed are vectors?

II and IV

I and II

I and III

II and III

Scalars And Vectors

Wo Idahun

Ibeere 29 Ìròyìn

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

Mercury

Argon

Air

Neon

Gas Laws

Wo Idahun

Ibeere 30 Ìròyìn

PHCN measures its electrical energy in

W

KWh

Wh

J

Electric Cells

Wo Idahun

Ibeere 31 Ìròyìn

What type of reaction is represented by the equation $ {}^{2}_{1}X + {}^{2}_{1}X \rightarrow {}^{3}_{2}Y + {}^{1}_{0}n + \text{Energy} $

Ionization

Fusion

Fission

Chain

Structure Of The Atom (Nigeria Only)

Wo Idahun

Ibeere 32 Ìròyìn

A force of 500N1 is applied to a steel wire of cross-sectional area 0.2m2, The tensile stress is

2.5x104Nm-2

1.0x102Nm-2

1.0x103Nm-2

2.5x103Nm-2

Awọn alaye Idahun

$S t r e s s = \frac{F o r c e}{A r e a}$
$S t r e s s = \frac{500}{0.2} = 2500$
= 2.5 x 103Nm-3

Ka ìwé ẹ̀kọ́ nípa Elasticity (JAMB)

Elasticity

Wo Idahun

Ibeere 33 Ìròyìn

A boy receives the echo of his clap reflected by a nearby hill 0.8s later. How far is he from the hill?

528m

66m

136m

264m

Wo Idahun

Ibeere 34 Ìròyìn

The distance between two successive crests of a wave is 15cm and the velocity 300ms-1. Calculate the frequency.

2.0x102Hz

4.5x103Hz

2.0x103Hz

4.5x102Hz

Types Of Waves

Wo Idahun

Ibeere 35 Ìròyìn

The quantity of heat needed to raise the temperature of a body by 1K is the body's

Heat capacity

Internal energy

Specific heat capacity

Latent heat of fusion

Quantity Of Heat

Wo Idahun

Ibeere 36 Ìròyìn

Heat transfer by convection in a liquid is due to the

Latent heat of vaporization of the liquid

Increased vibration of the molecules of the liquid about theit mean position

Variation of density of the liquid

Expansion of the liquid as it is heated

Heat Transfer

Fluid At Rest

Wo Idahun

Ibeere 37 Ìròyìn

A quantity which requires magnitude and direction to be specified is

Temperature

Distance

Displacement

Mass

Scalars And Vectors

Wo Idahun

Ibeere 38 Ìròyìn

An object of weight 80kg 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

48N

12N

27N

36N