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

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

JAMB UTME - Physics - 2019 | Green Bridge CBT

Question 1 Report

The resultant capacitance in the figure above is

0.4μf

0.8μf

1.8μf

4.5μf

Answer Details

For the parallel arrangement = 2 + 4 = 6μf

For

the

series

arrangement

=

1C

_{T}

=

12

+

13

+

16

+

14

1C

_{T}

=

1512

C

_{T}

=

1215

=

0.8μf

Read lesson note on Capacitors (JAMB)

Capacitors

View Answer

Question 2 Report

In a slide wire bridge, the balance is obtained at a point 25cm from one end of wire 1m long. The resistance to be tested is connected to that end and a standard resistance of $3.6\,\Omega$ is connected to the other end of the wire. Determine the value of the unknown resistance

3.2

Ω

1.4

Ω

3.21

Ω

1.2

Ω

Answer Details

$\frac{R}{3.6} = \frac{75}{25} = \frac{1}{3}$

3R = 3.6

R = 1.2 $Ω$

View Answer

Question 3 Report

A cone is in unstable equilibrium has its potential energy

decreased

increased

unchanged

oscillating

Newton’s Laws Of Motion

Equilibrium Of Forces

View Answer

Question 4 Report

According to kinetic molecular model, in gases

The molecules are very fast apart and occupy all the space made available.

The particles occur in clusters with molecules slightly farther apart.

The particles are closely packed together, they occupy minimum space and are usually arranged in a regular pattern.

The particles vibrate about fixed positions and are held together by the strong inter-molecular bond between them.

Gas Laws

Quantity Of Heat

Thermal Expansion

Structure Of Matter And Kinetic Theory

View Answer

Question 5 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 6 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 7 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 8 Report

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

is a light material

is a good conductor

is a good insulator

can be converted into thin sheets

Electrostatics

View Answer

Question 9 Report

In which of the points labelled A, B, C, D and E on the conductor shown would electric charge tend to concentrate most

A

B

C

E

Electric Field

Electrostatics

View Answer

Question 10 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 11 Report

Which of the following statement about the electromagnet shown above is correct?

when the current flows from A to B, the end A will be in north pole

when the current flows from A to B, the end A will be south pole

when the current flows from A to B, the end B will be north pole

none of the above

Electric Field

View Answer

Question 12 Report

In the molecular explanation, heat is transferred by the

free electron

free atoms

free molecules

free solids

Thermal Expansion

View Answer

Question 13 Report

An alternating current can induce voltage because it has

ripple value

varying magnetic field

weaker magnetic field than direct current

high peak value

View Answer

Question 14 Report

A thermocouple thermometer is connected to a millivoltmeter which can read up to 10mV. When one junction is in ice at 0°C and the other is steam at 100°C, the millivoltmeter reads 4mV. What is the maximum temperature which this arrangement can measure

100

^{o}

C

248

^{o}

C

250

^{o}

C

350

^{o}

C

Temperature And Its Measurement

View Answer

Question 15 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 16 Report

The limiting frictional force between two surfaces depends on

I. the normal reaction between the surfaces

II. the area of surface in contact

III. the relative velocity between the surfaces

IV. the nature of the surfaces

I only

II only

III only

I and IV only

Friction

View Answer

Question 17 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 18 Report

The equilibrium position of objects in any field corresponds to situation of

equipotential energy

maximum potential energy

minimum potential energy

maximum kinetic energy

Gravitational Field

Measurements And Units

View Answer

Question 19 Report

A body moves in SHM between two point 20m on the straight line Joining the points. If the angular speed of the body is 5 rad/s. Calculate its speed when it is 6m from the center of the motion.

20 m/s

30 m/s

40 m/s

50 m/s

Answer Details

From two parts 20m apart
a = 10m, x = 6m, A = 5
V = ω

\sqrt{A^{2} - X^{2}}

= 5

\sqrt{10^{2} - 6^{2}}

= 40m/s

Read lesson note on Simple Harmonic Motion (WAEC)

Simple Harmonic Motion

View Answer

Question 20 Report

The following are some units

I. Ns

II. Non

III. $ \mathrm{Nm}^{-2} $

IV. $ \mathrm{J^\circ K}^{-1} $

V. $ \mathrm{JKj}^{-1} $

What are the units of latent heat?

I

II

III

V

Work, Energy & Power

Measurements And Units

View Answer

Question 21 Report

The Earth's magnetic equator passes through Jos in Nigeria. At Jos, the

angle of variation is zero

magnetic declination is 90

angle of dip is zero

horizontal component at the Earth's field is zero

Electromagnetic Field (Part 2)

View Answer

Question 22 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 23 Report

When water is boiling, it

gets hotter

increase is mass

decreases in mass

changes to steam

View Answer

Question 24 Report

The point at which the molecules of a loaded wire begin to slide across each other resulting in a rapid increase in extension is

yield point

proportionality point

deformation point

elastic point

Elasticity

View Answer

Question 25 Report

A car moving at 20m/s with its horn blowing (f = 1200Hz) is chasing another car going at 15m/s. What is the apparent frequency of the horn as heard by the driver being chased?

1.22KHz

2.40KHz

8.12KHz

1.22Hz

Answer Details

f

_{1}

=

f(v - v

_{o}

)v - v

_{s}

=

1200(340 - 15)340 - 20

=

1.22KHz

Read lesson note on Position, Distance And Displacement (WAEC)

Position, Distance And Displacement

View Answer

Question 26 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 27 Report

Water and Kerosine are drawn respectively into the two limbs of a Hare's apparatus. The destiny of water is $1.0\mathrm{g\,cm^{-3}}$ and the density of kerosine is $0.80\mathrm{g\,cm^{-3}}$. If the height of the water column is 20.0cm, calculate the height of the kerosine column.

1.6cm

16.0cm

20.0cm

25.0cm

Answer Details

Devices with different liquids
d $_{1}$ h $_{1}$ = d $_{2}$ h $_{2}$
1 × 20 = 0.8 × h

h

=

200.8

=

25cm

Read lesson note on Temperature And Its Measurement (JAMB)

Temperature And Its Measurement

View Answer

Question 28 Report

A well 1km deep is filled with a liquid of density $950\text{kg/m}^3$ and $g = 10\text{m/s}^2$, the pressure at the bottom of the well is

9.6 × 10

^{6}

N/m

^{2}

9.5 x 10

^{5}

N/m

^{2}

9.4 x 10

^{6}

N/m

^{2}

9.5 x 10

^{6}

N/m

^{2}

Answer Details

P = Pa + ρgh = (1.00 × 10

^{5}

) + (950 × 10 × 1000)
P = 10

^{5}

+ (95 × 10

^{5}

) = 10

^{5}

(1 + 95) = 96 × 10

^{5}

P = 9.6 × 10

^{6}

N/m

^{2}

Read lesson note on Pressure (JAMB)

Read lesson note on Motion (WAEC)

Pressure

Motion

View Answer

Question 29 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 30 Report

An a.c of 1A at a frequency of 800 cycles per second flows through a coil, the inductance of which is 2.5mH and the resistance of which is 5Ω. What is the power absorbed in the Coil?

5W

6W

7W

8W

Answer Details

I = 1A, F = 800 cycles/s = 800Hz
R = 5Ω, L = 2.5mH
P = I

^{2}

R = I

^{2}

× 5 = 5W

View Answer

Question 31 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 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

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 34 Report

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

angle of variation is zero

magnetic declination is 90

angle of dip is zero

horizontal component at the Earth's field is zero

Magnetic Field (Part 2)

Electric Field

View Answer

Question 35 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 36 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 37 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 38 Report

According to kinetic molecular model, in gases

The particles are closely packed together, they occupy minimum space and are usually arranged in a regular pattern

The particles occur in clusters with molecules slightly farther apart

The molecule are very fast apart and occupy all the space made available

The particle vibrate about fixed positions and are held together by the strong intermolecular bonds between them

Thermal Expansion

View Answer

Question 39 Report

A metal rod has a length of 100cm at $200^\circ C$. At what temperature will its length be 99.4cm. If the linear expansivity of the material of the rod is $2 \times 10^{-5}C^{-1}$

200

^{o}

C

300

^{o}

C

100

^{o}

C

-100

^{o}

C

Thermal Expansion

Temperature And Its Measurement

View Answer

Question 40 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






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