JAMB UTME - Physics - 2013 | Green Bridge CBT

Question 1 Report

The energy of a photo having a wavelength of 10^-10m is

(h= 6.63 x 10 ^-34Js, c =3.0 x 10 ⁸ms^-1)

2.0 x 10 ^-15J

1.7 x 10 ^-13J

2.0 x 10 ^-12J

1.7 x 10 ^-12J

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Question 2 Report

Food cook quicker in salt water than in pure water because of the effect of

dissolved substances on the boiling point

atmospheric pressure on the boiling point

food nutrients on the thermal energy

salts on the thermal conductivity of water

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Question 3 Report

A simple pendulum of length 0.4m has a period of 2s. What is the period a similar pendulum of length 0.8m at the same place?

8s

4s

2

\sqrt{2} s

√2s

Answer Details

T2 =

\sqrt{\frac{L^{2} \times T_{1}^{2}}{L_{1}}}

= $\sqrt{\frac{0.8 \times 2^{2}}{0.4}}$

= 2 $\sqrt{2} s$

Read lesson note on Rectilinear Acceleration (WAEC)

Rectilinear Acceleration

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Question 4 Report

The mechanism of heat transfer from one point to another through the vibration of the molecules of the medium is

covection

conduction

radiation

diffusion

Heat Transfer

Electromagnetic Field (Part 1)

Temperature And Its Measurement

Conduction Of Electricity Through

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Question 5 Report

Total internal reflection will not occur when light travels from

water to air

water into glass

glass to air

glass into water

Reflection Of Light At Plane And Curved Surfaces

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Question 6 Report

When a brick is taken from the earth's surface to the moon, its mass

remains constant

reduces

increases

becomes zero

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Question 7 Report

The rise or fall of a liquid in a narrow tube is because of the

viscosity of the liquid

surface tension of the liquid

friction between the walls of the tube and the liquid

osmotic pressure of the liquid

Friction

Pressure

Liquids At Rest

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Question 8 Report

If a pump is capable of lifting 5000kg of water through a vertical height of 60m in 15 min, the power of the pump is

2.2.5 x 10 5js-1

2.5 x 104js-1

3.3 x 103js-1

3.3 x 102js-1

Work, Energy And Power

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Question 9 Report

What will happen to the boiling point of pure water when it is heated in a place 30m below sea level?

It will be more than 100 oC

It will be last than 100 oC

It will still be at 100 oC

It will be fluctuating

Temperature And Its Measurement

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Question 10 Report

A piece of cork floats in a liquid. What fraction of its volume will be immersed in the liquid? [Density of the cork = 0.25 x 103kgm-3, Density of the liquid = 1.25 x 103kgm-3]

0.8

0.5

0.2

0.1

Temperature And Its Measurement

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Question 11 Report

When a brick is taken from the earth's surface to the moon, its mass

Remains constant

Becomes zero

Reduces

increases

Time

Gravitational Field

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Question 12 Report

At what depth below the sea-level would one experience a change of pressure equal to one atmosphere? Density of sea water = 1013kg-3, one atmosphere = 0.01 x 105Nm-2, g = 10ms-2

0.1m

1.0m

10.0m

100.0m

Pressure

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Question 13 Report

Calculate the length which corresponds to a temperature of 20oC if the ice and steam points of an unguarded thermometer are 400 mm apart

20mm

30mm

60mm

80mm

Answer Details

At 100oC = 400

Therefore,

At 20oC = $\frac{400}{100} \times \frac{20}{1}$ = 80

Read lesson note on Temperature And Its Measurement (JAMB)

Temperature And Its Measurement

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Question 14 Report

A wave that travels through stretched strings is known as

electromagnetic wave

micro wave

mechanical wave

seismic wave

Answer Details

The wave that travels through stretched strings is a mechanical wave. Mechanical waves are waves that require a medium, such as a solid, liquid, or gas, to travel through. In the case of a wave traveling through a stretched string, the string serves as the medium. As the string is stretched and then released, it vibrates back and forth, creating a disturbance that propagates along the length of the string. This disturbance is what we perceive as a wave. The wave will have properties such as wavelength, frequency, and amplitude, which can be measured and used to describe the wave. Electromagnetic waves, on the other hand, do not require a medium to travel through and can travel through a vacuum. Examples of electromagnetic waves include radio waves, microwaves, and light. Seismic waves are waves that travel through the Earth's crust and are associated with earthquakes.

Read lesson note on Sound Waves (WAEC)

Read lesson note on Production And Propagation Of Waves (WAEC)

Read lesson note on Magnetic Field (Part 1) (WAEC)

Read lesson note on Electromagnetic Field (Part 2) (WAEC)

Read lesson note on Gravitational Field (WAEC)

Sound Waves

Production And Propagation Of Waves

Magnetic Field (Part 1)

Electromagnetic Field (Part 2)

Gravitational Field

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Question 15 Report

If the linear magnification of the objective and eyepiece convex lenses of a compound microscope are 4 and 7 respectively. Calculate the angular magnification of the microscope

2

3

11

28

Measurements And Units

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Question 16 Report

Induced emfs are best explained using

Ohm's law

Faraday's law

Colomb's law

Lenz's law

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Question 17 Report

An object is moving with a velocity of 5m-1. At what height must a similar body be situated to have a potential energy equal in value with kinetic energy of the moving body?

25.0m

20.0m

1.3m

1.0m

Answer Details

To solve this problem, we need to use the conservation of mechanical energy principle, which states that the total mechanical energy of a system (the sum of potential and kinetic energy) remains constant if there are no external forces acting on the system. Let's first calculate the kinetic energy of the moving object. The kinetic energy formula is KE = 0.5 * m * v^2, where m is the mass of the object and v is its velocity. Since we are not given the mass of the object, we can assume it to be 1 kg (since the mass does not affect the height at which the other object must be situated). Therefore, the kinetic energy of the moving object is: KE = 0.5 * 1 * (5)^2 = 12.5 Joules Now, we need to find the height at which the other object must be situated to have the same amount of potential energy as the kinetic energy of the moving object. The potential energy of an object is given by the formula PE = m * g * h, where m is the mass of the object, g is the acceleration due to gravity (9.8 m/s^2), and h is the height at which the object is situated. We want to find the height h at which PE = KE, so we can equate the two formulas: m * g * h = 0.5 * m * v^2 Canceling out the mass on both sides, we get: g * h = 0.5 * v^2 Plugging in the values, we get: h = (0.5 * v^2) / g h = (0.5 * 5^2) / 9.8 h = 1.275 m Therefore, the height at which the other object must be situated to have the same amount of potential energy as the kinetic energy of the moving object is 1.275 meters. The closest option to this answer is 1.3m, so the correct answer is (C) 1.3m.

Read lesson note on Motion (JAMB)

Motion

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Question 18 Report

What is the velocity of sound at 100 ^oC if the velocity of sound at 0 ^oC is 340ms ^-1?

497m^-1

440m^-1

397m^-1

240m^-1

Current Electricity

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Question 19 Report

Which of the following obeys ohms laws?

electroytes

metals

diode

glass

Current Electricity

Electrostatics

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Question 20 Report

The pair of physical quantities that are scalar only are ?

volume and area

moment and momentum

length and displacement

Impulse and time

Answer Details

Scalar physical quantities are those that can be described only by their magnitude, without specifying any direction. For example, mass, temperature, and speed are scalar quantities. Out of the given options, the pair of physical quantities that are scalar only are volume and area. Both of these quantities can be described only by their magnitude, without any reference to direction. On the other hand, moment and momentum, length and displacement, and impulse and time are all vector quantities. These physical quantities have both magnitude and direction. Moment is the product of a force and its perpendicular distance from a reference point. Momentum is the product of an object's mass and velocity. Both of these physical quantities have direction and magnitude. Length and displacement are also vector quantities. Displacement is the change in position of an object from one point to another, and it has both magnitude and direction. Length, on the other hand, is the distance between two points, and it too has both magnitude and direction. Impulse and time are also not scalar quantities. Impulse is the product of force and time, and it has both magnitude and direction. Time, although it is a one-dimensional quantity, does not have direction but it has magnitude. Therefore, the correct answer is "volume and area". These are the only scalar physical quantities out of the given options.

Read lesson note on Scalars And Vectors (JAMB)

Read lesson note on Measurements And Units (JAMB)

Scalars And Vectors

Measurements And Units

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Question 21 Report

The coefficient of friction between two perfectly smooth surface is

infinity

one

half

zero

Friction

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Question 22 Report

What volume of alcohol will have same mass as 4.2m-3 of petrol?

Density of alcohol = 8.4 x 102kgm-3, density of petrol =7.2x103kgm-3

0.8m3

1.4m3

3.6m3

49.m3

Scalars And Vectors

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Question 23 Report

Calculate the force acting on an electron of charge 1.5 x 10-19C placed in an electric field of intensity 105Vm-1

1.5x10-11N

1.5x10-12N

1.5x10-13N

1.5x10-14N

Electrostatics

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Question 24 Report

If a current of 2.5A flows through an electrolyte for 3 hours and 1.8g of a substance is deposited, what is the mass of the substance that will be deposited if a current of 4A flows through it for 4.8 hours?

2.4g

3.2g

4.6g

4.8g

Answer Details

First let's find z

z = $\frac{M}{I t}$

z = $\frac{1.8}{2.5 \times (3 \times 60 \times 60)}$

Therefore, the new M equals

M = zIt

M = $\frac{1.8 \times 4 \times 4.8 \times 60 \times 60}{2.5 \times 3 \times 60 \times 60}$

M = 4.6g

Read lesson note on Current Electricity (JAMB)

Current Electricity

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Question 25 Report

The particle nature of light is demonstrated by the

photoelectric effect

speed of light

colours of light

diffraction of light

Structure Of The Nucleus

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Question 26 Report

What effort will a machine of efficiency 90% apply to lift a load of 180N if its efforts arm is twice as long as its load arm?

80N

90N

100N

120N

Answer Details

M.A. = $\frac{E f f \times V . R .}{100}$
M.A. = $\frac{90 \times 2}{100}$
M.A. = 1.8
E = $\frac{L}{M . A .}$
E = $\frac{180}{1.8}$
E = 100N

Read lesson note on Simple Machines (JAMB)

Simple Machines

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Question 27 Report

If a sonometer has a fundamental frequency of 450HZ, what is the frequency of the fifth overtone?

2700Hz

456Hz

444Hz

75Hz

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Question 28 Report

A cell of emf 1.5V is connected in series with a 1? resistor and a current of 0.3A flows through the resistor. Find the internal resistance of the cell

4.0Ω

3.0Ω

1.5Ω

1.0Ω

Answer Details

r =

\frac{E}{I} - R

r = $\frac{1.5}{0.3} - 1$

r = 4 $Ω$

Read lesson note on Electric Cells (JAMB)

Electric Cells

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Question 29 Report

To convert a galvanometer to a voltmeter, a

high resistance is connected to it in series

high resistance is connected to it in parallel

low resistance is connected to it in parallel

low resistance is connected to it in series

Answer Details

To convert a galvanometer to a voltmeter, a high resistance is connected to it in series. A galvanometer is an instrument used to measure small electric currents. It works by measuring the deflection of a coil of wire in a magnetic field. A voltmeter, on the other hand, is used to measure voltage or potential difference in a circuit. To convert a galvanometer to a voltmeter, we need to add a resistor in series with the galvanometer. The resistor will increase the overall resistance of the circuit, which will reduce the current flowing through the galvanometer. This is important because a galvanometer is designed to measure small currents, and if too much current flows through it, it can be damaged. By adding a resistor in series with the galvanometer, we can create a voltage divider circuit. The voltage drop across the resistor will be proportional to the voltage drop across the entire circuit, which includes the galvanometer. By choosing the appropriate value for the resistor, we can scale the voltage drop across the galvanometer to the desired level, allowing us to use the galvanometer as a voltmeter. The resistor used should have a high resistance, typically on the order of thousands or millions of ohms. This is because we want to minimize the amount of current flowing through the galvanometer while still allowing enough current to flow to make a measurement. Connecting a low resistance in series or a high resistance in parallel will not work to convert a galvanometer to a voltmeter because these configurations will not create a voltage divider circuit that scales the voltage drop across the galvanometer to the desired level. Therefore, the correct answer is high resistance is connected to it in series.

Read lesson note on Capacitors (JAMB)

Read lesson note on Conduction Of Electricity Through (JAMB)

Capacitors

Conduction Of Electricity Through

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Question 30 Report

The resultant of two forces is 50N. If the forces are perpendicular to each other and one of them makes an angle 0f 30o with the resultant, find its magnitude.

100.0N

57.7N

43.3N

25.0N

Scalars And Vectors

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Question 31 Report

The bond between silicon and germanium is

covalent

trivalent

dative

ionic

Structure Of The Atom (Nigeria Only)

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Question 32 Report

Calculate the work done when a force of 20N stretches a spring by 50mm.

0.5J

1.5J

2.0J

2.5J

Answer Details

W =

\frac{1}{2} F e

W = $\frac{1}{2} \times 20 \times 0.05$

W = 0.5J

Read lesson note on Work, Energy And Power (WAEC)

Work, Energy And Power

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Question 33 Report

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

water has a high specific heat

steam has latent heat of fusion

the steam is at a highter temperature than the water

steam brings heat more easily by convection

Heat Energy

Liquids At Rest

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Question 34 Report

A house has ten 40W and five 100W 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 5N?

N90

N50

N45

N5

Heat Energy

Motion

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Question 35 Report

When a charge moves through an electric circuit in the direction of an electric force, it

gains both potential and kinetic energy

gains potential energy and lose kinetic energy

loses potential energy and gains kinetic energy

loses both potential and kinetic energy

Electrostatics

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Question 36 Report

A wire of length 100.0m at 30o has linear expansive of 2x10-5K-1 Calculate the length of the wire at a temperature of - 10oC

100.08m

100.04m

99.96m

99.92m

Answer Details

L_{2} = L_{1} + α (θ_{2} - θ_{1})

= 100 + 0.00002(-10-30) = 99.92

Read lesson note on Temperature And Its Measurement (JAMB)

Temperature And Its Measurement

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Question 37 Report

A transverse wave and a longitudinal wave travelling in the same direction in a medium differ essentially in their

frequency

amplitude

direction of vibration of the particles of the medium

period of vibration of the particles of the medium

Electrostatics

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Question 38 Report

In photo-emission, the number of photo-electrons ejected per second depends on the

frequency of the beam

work function of the metal

threshold frequency of the metal

intensity of the beam

Electrostatics

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Question 39 Report

A gas at a pressure of 105Nm-2expands from 0.6m-3 to 1.2m3 at constant temperature, the work done is

7.0 x 106J

6.0 x 10 6J

6.0 x 10 5J

6.0 x 10 4J

Answer Details

W =

\frac{W_{1} \times V_{1}}{V_{2}}

W = $\frac{10 \times 0.6}{1.2}$

W = 6.0 x 10 4J

Read lesson note on Heat Energy (WAEC)

Heat Energy

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Question 40 Report

Calculate the apparent weight loss of a man weighing 70kg in an elevator moving downwards with an acceleration of 1.5ms-2. [g = 10ms-2]

686N

595N

581N

105N

Scalars And Vectors

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Question 41 Report

Two liquids X and Y having the same mass are supplied with the same quantity of heat. If the temperature rise in X is twice that of Y, the ratio of specific heat capacity of X to that of Y is

2:1

1:2

4:1

1:4

Quantity Of Heat

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Question 42 Report

A man 1.5m tall is standing 3m in front of a pinhole camera whose distance between the hole and the screen is 0.1m. What is the height of the image of the man on the screen?

0.05m

0.15m

0.30m

1.00m

View Answer

Question 43 Report

Calculate the energy of the third level of an atom if the ground state energy is - 24.8eV

-9.20eV

-8.20eV

-2.75eV

-1.75eV

Answer Details

E_{3} = \frac{E}{n^{2}}

$E_{3} = \frac{- 24.8}{3^{2}}$

$E_{3} = 2.75 e V$

Read lesson note on Structure Of The Atom (Nigeria Only) (WAEC)

Structure Of The Atom (Nigeria Only)

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Question 44 Report

A ray of light passing through the centre of curvature of a concave mirror is reflected by the mirror at

0o

45o

90o

180o

Reflection Of Light At Plane And Curved Surfaces

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Question 45 Report

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

5s

10s

20s

40s