The angular dispersion of a prism depends on

The angle of incidence as well as the index of refraction

The thickness of the prism only

The momentum of a car moving at a constant speed in a circular track

can be zero depending on its position in the track

can be both positive and negative

can be zero depending on its position in the track

Ripple in a power supply unit is caused by

using an alternating current source

The mass of a nucleus is the

total number of its proton and neutrons

total number of its protons and electrons

A body was slightly displaced from its equilibrium position. Which one of the following is a condition for its stable equilibrium

an increase in the potential energy of the body

an increase in the kinetic energy of the body

an increase in the potential energy of the body

an increase in the height of the body

Which of these is observed when air is pumped out of a discharge tube without lowering its pressure

the conductivity of the air increases

the conductivity of the air decreases

Aluminium is sometimes used as the leaf of an electroscope because it

can be converted into thin sheets

- angle of dip is zero at the magnetic equator - angle of variation is the same as angle of declination.

horizontal component at the Earth's field is zero

The pin-hole camera produces a less sharply defined image when the

screen is further from the pin-hole

object is further from the pin-hole

An alternating current can induce voltage because it has

weaker magnetic field than direct current

JAMB UTME - Physics - 2019 | Green Bridge CBT

Question 1 Report

A straight wire 15cm long, carrying a current of 6.0A is in a uniform field of 0.40T. What is the force on the wire when it is at right angle to the field

0.46N

0.35N

0.36N

0,24N

Force On A Current-Carrying Conductor In A Magnetic Field

View Answer

Question 2 Report

When a girl moves towards a plane mirror at a speed of 4.0m/s, the distance between the girl and her image reduces a speed of

2 m/s

4 m/s

8 m/s

12 m/s

Reflection Of Light At Plane And Curved Surfaces

View Answer

Question 3 Report

Workdone on an object to bring it to a certain point in space is called

Gravitational potential energy

Potential energy

Kinetic energy

Mechanical energy

Energy

Gravitational Field

View Answer

Question 4 Report

Electrons were discovered by

Dalton

James Charwick

J.J. Thompson

Niels Bohr

Structure Of The Atom (Nigeria Only)

View Answer

Question 5 Report

If a body moves with a constant speed and at the same time undergoes an acceleration, its motion is said to be

oscillation

circular

rotational

rectilinear

Rectilinear Acceleration

View Answer

Question 6 Report

A rectangular solid black has length 10cm, breadth 5cm and height 2cm. If it lies on a horizontal surface, and has density $100\text{kg/m}^3$, calculate the pressure it exerts on the surface.

200 N/m

^{2}

100 N/m

^{2}

400 N/m

^{2}

Answer Details

To calculate the pressure that the rectangular solid exerts on the surface, we need to use the formula for pressure: Pressure = Force / Area In this case, the force is the weight of the rectangular solid, which we can calculate using the formula: Weight = Mass x Gravity The mass of the rectangular solid can be calculated using its density and volume: Mass = Density x Volume The volume of the rectangular solid is simply its length x breadth x height: Volume = Length x Breadth x Height = 10 cm x 5 cm x 2 cm = 100 cm3 We need to convert this volume to cubic meters to use the density given in kg/m3: Volume = 100 cm3 = 0.0001 m3 Now we can calculate the mass: Mass = Density x Volume = 100 kg/m3 x 0.0001 m3 = 0.01 kg The gravity is the acceleration due to gravity, which we can assume to be 9.81 m/s2. Therefore, the weight is: Weight = Mass x Gravity = 0.01 kg x 9.81 m/s2 = 0.0981 N Now we can use this weight to calculate the pressure on the surface. The surface area in contact with the rectangular solid is simply its length x breadth: Area = Length x Breadth = 10 cm x 5 cm = 50 cm2 We need to convert this area to square meters: Area = 50 cm2 = 0.005 m2 Therefore, the pressure is: Pressure = Force / Area = 0.0981 N / 0.005 m2 = 19.62 N/m2 We can convert this to units of N/cm2 or N/mm2 if desired. This is equivalent to: Pressure = 0.1962 N/cm2 = 0.0001962 N/mm2 So the pressure that the rectangular solid exerts on the surface is 19.62 N/m2, which is approximately 20 N/m2. Therefore, the answer is 200 N/m2.

Read lesson note on Pressure (JAMB)

Read lesson note on Measurements And Units (JAMB)

Pressure

Measurements And Units

View Answer

Question 7 Report

Which of the following readings cannot be determined with a meter rule?

2.56cm

2.25cm

2.50cm

2.05cm

Measurements And Units

View Answer

Question 8 Report

The distance between an object and its real image in a convex lens is 40cm. If the magnification of the image is 3, calculate the focal length of the lens

6.5 cm

7.5 cm

8.5 cm

4.5 cm

Answer Details

u + v = 40

$\frac{v}{u}$ = 3

v = 3u

u + 3u = 40

4u = 40

u = 10cm

v = 3u = 30cm

f = $\frac{u v}{u + v} = \frac{10 (30)}{10 + 30} = \frac{300}{40}$

= 7.5 cm

Read lesson note on Gravitational Field (WAEC)

Gravitational Field

View Answer

Question 9 Report

Calculate the velocity ratio of a screw jack of pitch 0.2cm if the length of the tommy bar is 23cm

230

π

23

π

70

π

140

π

Simple Machines

View Answer

Question 10 Report

The diagram shows a uniform meter rule AB which balances horizontally at the 90cm mark when a mass of 0.2kg is suspended from B. Calculate the mass of the meter rule.

0.05kg

0.20kg

0.80kg

1.00kg

Answer Details

M $_{r}$ (90 - 50) = 0.2(100 - 90)
40M $_{r}$ = 0.2 × 10

M $_{r}$ = $\frac{2}{40}$ = 0.05kg

Read lesson note on Measurements And Units (JAMB)

Measurements And Units

View Answer

Question 11 Report

The diagram shows four positions of the bob of a simple pendulum. At which of these positions does the bob have maximum kinetic energy and minimum potential energy

1

2

3

4

Answer Details

At position 1, the bob of the simple pendulum has the maximum potential energy and zero kinetic energy. At position 4, the bob has the maximum kinetic energy and minimum potential energy. To understand this, we need to know that the energy of a simple pendulum is converted back and forth between kinetic energy and potential energy as it swings back and forth. When the bob is at its highest point (position 1), it has the maximum potential energy because it is farthest from the ground and has the most potential to move downward. At this point, the bob has zero kinetic energy because it is momentarily at rest. As the bob swings downward towards the equilibrium point, it gains speed and its potential energy is converted to kinetic energy. At the equilibrium point (position 2), the bob has equal amounts of kinetic and potential energy. As the bob continues to move downward, its potential energy decreases and its kinetic energy increases. At position 3, the bob has minimum potential energy and some amount of kinetic energy. At the lowest point of its swing (position 4), the bob has maximum kinetic energy because it is moving at its fastest speed. At this point, the bob has minimum potential energy because it is closest to the ground and has the least amount of potential to move downward. So, to summarize, the bob has maximum potential energy at position 1, equal amounts of kinetic and potential energy at position 2, minimum potential energy at position 3, and maximum kinetic energy at position 4.

Read lesson note on Newton’s Laws Of Motion (WAEC)

Read lesson note on Equilibrium Of Forces (WAEC)

Newton’s Laws Of Motion

Equilibrium Of Forces

View Answer

Question 12 Report

If the attraction of the sun is suddenly ceased, the earth would continue to move in a straight line making a tangent with the original orbit. This statement is derived from Neutron's

First law of motion

Second law of motion

Third law of motion

Law of universal gravitation

Newton’s Laws Of Motion

View Answer

Question 13 Report

A man on a bench will exert the greatest pressure on the bench when he

lies flat on his back

lies flat on his belly

stands on both feet

stands on the toes of one foot

Pressure

Measurements And Units

View Answer

Question 14 Report

The conductivity of gases at low pressure can be termed as

I. hot cathode emission

II. thermo ionic emission

III. cold cathode emission

IV. Field emission

I and II

II and III

III and IV

IV and V

Properties Of Waves: Reflection, Refraction, Diffraction

View Answer

Question 15 Report

Neutrons were discovered by

Faraday

Dalton

James Chadwick

Rutherford

Structure Of The Atom (Nigeria Only)

View Answer

Question 16 Report

The lower fixed part of a faulty thermometer reads 2°C while the upper fixed point is 100°C.

What is the true temperature when the thermometer reads 51°C?

52°C

50°C

49°C

46°C

Quantity Of Heat

Temperature And Its Measurement

View Answer

Question 17 Report

"Sum of all forces acting on a body is zero." This condition represents equilibrium'

First condition

Second condition

Third condition

Fourth condition

View Answer

Question 18 Report

The earth's gravitational field intensity at its surface is about

$G = 6.7 \times 10^{-11}\,\mathrm{Nm^2/kg^2}$, mass of the earth is $6 \times 10^{24}\,\mathrm{kg}$, radius of the earth is $6.4 \times 10^6\,\mathrm{m}$, g on the earth = $9.8\mathrm{m/s^2}$

6.7N/kg

7.9N/kg

8.0N/kg

9.8N/kg

Gravitational Field

View Answer

Question 19 Report

In the molecular explanation of conduction, heat is transferred by the

Free electrons

Free atoms

Free molecules

Free solids

Thermal Expansion

View Answer

Question 20 Report

A ray of light passes through the centre of curvature of a concave mirror and strikes the mirror. At what angle is the ray reflected?

180

^{o}

90

^{o}

0

^{o}

60

^{o}

View Answer

Question 21 Report

Any line or section taken through an advancing wave in which all the particles are in the same phase is called the

wavelength

wave coast

wave trough

wave front

Production And Propagation Of Waves

View Answer

Question 22 Report

In Sunlight, a blue flower looks blue because we see the flower by the light it

receives from our eyes

disperses

absorbed

reflect

Electromagnetic Waves: Types Of Radiation In Electromagnetic Spectrum

Wave-particle Paradox

Structure Of The Nucleus

View Answer

Question 23 Report

Which of the following media allow the transmission of sound waves through them?

I. air

II. liquid

III. solids

I and II only

I and III only

II and III only

I, II and III

Sound Waves

View Answer

Question 24 Report

The volume of 0.354g of helium at 273°C and 114cm of mercury pressure is 2667cm$^{3}$. Calculate the volume

2000.25 cm

^{3}

200.025 cm

^{3}

4003.27 cm

^{3}

2010.25 cm

^{3}

Answer Details

m = 0.354g, T $_{1}$ = 273°C = 273 + 273 = 576K
P $_{1}$ = 114cmHg, V $_{1}$ = 2667cm $^{3}$ at STP
T $^{2}$ = 273K, P $_{2}$ = 76cmHg, V $_{2}$ = ?

P

^{1}

V

^{1}

T

^{1}

=

P

^{2}

V

^{2}

T

^{1}

V

_{2}

=

114 × 2667 × 27376 × 576

=

2000.25cm

^{3}

Read lesson note on Temperature And Its Measurement (JAMB)

Temperature And Its Measurement

View Answer

Question 25 Report

Which of the following equations is the correct definition of the reactance of an indicator L?

Reactance = (Amplitude of voltage)

\div

(Amplitude of current)

Reactance = (Amplitude of voltage) x (Amplitude of current)

Reactance = (Amplitude of current)

^{2}

\div

(Amplitude of voltage)

Reactance = (Amplitude of current)

^{2}

\div

(Amplitude of voltage)

\frac{1}{2}

Electric Field

View Answer

Question 26 Report

The pitch of a screw jack is 0.45cm and the arm is 60cm long. If the efficiency of the Jack is 75/π %, calculate the mechanical advantage.

400

300

200

150

Simple Machines

Measurements And Units

View Answer

Question 27 Report

A supply of 400V is connected across capacitors of 3μf and 6μf in series. Calculate the charge

8 x 10

^{- 4}

C

4 x 10

^{- 2}

C

8 x 10

^{- 3}

C

4 x 10

^{- 8}

C

Answer Details

C

_{T}

=

C

_{1}

× C

_{2}

C

_{1}

+ C

_{2}

=	3 × 63 + 6

= $\frac{18}{9}$ = 2μf
Q = CV
⇒ 2 × 10 $^{- 6}$ × 400
⇒ 800 × 10 $^{- 6}$ C = 8 × 10 $^{- 4}$ C

Read lesson note on Capacitors (JAMB)

Capacitors

View Answer

Question 28 Report

A mixture of blue and red pigment when illuminated by white light will appear

green

orange

purple

magenta

Structure Of The Nucleus

View Answer

Question 29 Report

When the temperature of a liquid is increased, its surface tension

increases

decreases

remain constant

increases then decreases

Temperature And Its Measurement

View Answer

Question 30 Report

Which of the following is consistent with Charles' law?

I

II

III

IV.

I

II

III

IV

Gas Laws

Temperature And Its Measurement

View Answer

Question 31 Report

Heat may be transferred by conduction, convention and radiation. By which of these methods does heat travel through vacuum?

Conduction only

Convection only

Radiation only

All these methods

Heat Transfer

View Answer

Question 32 Report

The volume of a stone having an irregular shape can be determined using?

meter rule

measuring cylinder

vernier calliper

micrometer screw gauge

Measurements And Units

View Answer

Question 33 Report

The diagram above represents the stress-strain graph of a loaded wire. Which of these statements is correct?

At J, the wire becomes plastic

J is the yield point

L is the elastic limit

At K, the wire breaks

Elasticity

Measurements And Units

View Answer

Question 34 Report

The value of T in the figure above is

30N

10.0N

20N

40N

Answer Details

Tsin30 + Tsin30 =40

2Tsin30 = 40

Tsin30 = 40/2 = 20

T( $\frac{1}{2}$ ) = 20

T = 20 x 2 = 40N

Read lesson note on Scalars And Vectors (JAMB)

Read lesson note on Motion (JAMB)

Scalars And Vectors

Motion

View Answer

Question 35 Report

One newton × One meter equals?

One water

One Joule

One ampere

One kilogram

Scalars And Vectors

View Answer

Question 36 Report

Gases conduct electricity under

high pressure and high voltage

low pressure and low voltage

normal pressure and low voltage

low pressure and high voltage

Gas Laws

View Answer

Question 37 Report

A single force which produces the same effect as a set of forces acting together at a point is known as the

component

equilibrant

resultant

resistant

Scalars And Vectors

Simple A.C Circuits

Equilibrium Of Forces

View Answer

Question 38 Report

Lamps in domestic lightings are usually in

series

divergent

convergent

parallel

Capacitors

View Answer

Question 39 Report

Efficiency of conduction in liquids and gases compared to solids is

less efficient than solid

more efficient than solids

equally efficient to solids

efficiently may vary

View Answer

Question 40 Report

Which of the following statements is/are correct for a freely falling body?

I. the total is entirely kinetic

II. the ratio of potential energy to kinetic energy is constant

III. the sum of potential and kinetic energy is constant

I only

II only

III only

I and III only

Work, Energy And Power

View Answer






Press & Hold to Drag Around
Click Here to Close