Measurements, Scalars and Vectors Generix Content - Measurements, Scalars and Vectors
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JAMB questions for "Physics :: Measurements, Scalars and Vectors"
Q1

A piece of iron weighs 250 N  in air and 200 N in a liquid of density 1000 kgm-3. The volume of the iron is

A

2.0 X 10-3m-3

B

5.0 X 10-3m-3

C

4.5 X 10-3m-3

D

2.5 X 10-3m-3

E
Q2

The unit of moment of couple can be expressed in

A

Nm2

B

Nm

C

Nm-1

D

Nm-2

E
Q3

A gramophone record takes 5s to reach its constant angular velocity of 4∏ rads-1 from rest. Find its constant angular acceleration.

A

B

C

D

E
Q4

If the radius of the earth is 6.4 x 106m, the escape velocity of a satellite from the earth is

A

1.27 x 104 ms-1

B

1.13 x 104 ms-1

C

8.00 x 103 ms-1

D

9.00 x 103 ms-1

E
Q5
The component of vector X along the direction of vector Y is zero when
A
X is perpendicular to Y
B
X is at an angle of 45° to Y
C
X and Y are parallel to each other
D
X and Y are in opposite directions to each other
E
Q6
The pair of physical quantities consisting of vectors only are
A
acceleration and speed
B
displacement and torque
C
velocity and distance
D
momentum and power
E
Q7
If the angle between two vectors P and Q is 0° , the vectors are said to
A
intersect at angle 45°
B
intersect at angle 60°
C
be parallel
D
be perpendicular
E
Q8
The earth is four times the size of the moon and the acceleration due to gravity on the earth is 80 times that of the moon. The ratio of the mass of the moon to that of the earth is
A
1: 80
B
1 : 320
C
1 : 1280
D
1:4
E
Q9

The figure beside shows two velocities V1 and V2. Which of the following diagrams correctly represents the vector difference W = V1 - V2?

A
B
C
D
E
Q10
The length of a piece of glass block was measured by means of a vernier calliper as s shown below. The length of the glass block is
A
1.65cm
B
1.66cm
C
1.64cm
D
1.63cm
E
Q11
Which of the following consists entirely of vector quantities ?
A
Tension, magnetic flux and mass
B
Displacement impulse and power
C
Work, pressure and moment
D
Velocity, magnetic flux and reaction
E
Q12
The inner diameter of a small test tube can be measured accurately using a
A
micrometer screw guage
B
pair of dividers
C
meter rule
D
pair of vernier callipers
E
Q13
The physical quantity that has the same dimensions as impulse is
A
energy
B
momentum
C
surface tension
D
pressure
E
Q14
In the diagram below, P, Q, and R are vectors. Which of the following options gives the correct relationship between the vectors?
A
P = Q + R
B
P = Q - R
C
P = R - Q
D
P + Q + R = 0
E
Q15
What is the reading of the vernier calipers shown below?
A
1.79cm
B
1.73cm
C
1.39cm
D
1.34cm
E
Q16
Which of the following quantities has the same unit as the watt?
A
Force X time
B
Force X distance
C
Force X acceleration
D
Force X velocity
E
Q17

The external and internal diameters of a tube are measured as ( 32 + 2) mm and (21  +  1)mm respectively. Determine the percentage error in the thickness of the tube

A

27%

B

14%

C

9%

D

3%

E
Q18
What is the least possible error in using a rule graduated in centimeters ?
A
0.1cm
B
0.5cm
C
1.0 cm
D
2.0 cm
E
Q19
Which of the following is the most suitable for use as an altimeter?
A
A mercury barometer
B
A fortin barometer
C
A mercury manometer
D
An aneroid barometer
E
Q20
What is the reading of the vernier scale below?
A
1.88cm
B
1.80cm
C
1.28cm
D
1.97cm
E
Q21
Which of the following is a fundamental unit?
A
Newton
B
Watt
C
Joule
D
Second
E
Q22
Which of the following is a vector?
A
Electric charge
B
Electric field
C
Electric potential difference
D
Electrical capacitance
E
Q23
Which of the following is a set of vectors?
A
Force, mass and moment
B
Acceleration , velocity and moment
C
Mass, weight and density
D
Mass, volume and density
E
Q24

Which of the following devices are used to measure pressure?

I. Aneroid barometer

II. Hydrometer

III. Hygrometer

IV. Manometer

A

I and III

B

II and III

C

III and IV

D

I and IV

E
Q25

Which of the following are the correct SI units of the quatities indicated? I N (Force) II. Nm-1   (Torque)    III. Watt(Power)      IV. kg ms-1 (momentum)

A

I and II only

B

I, II and III only

C

I, II and IV only

D

I, and III only

E
Q26
Which of the following quantities are scalars ; I. Electrical potential II. Torque III. Momentum IV. Kinetic energy
A
II and III only
B
I and II only
C
III and IV only
D
I and IV only
E
Q27

Which of the following units is equvalent to kgms-1

A

Ns-1

B

Nms

C

Ns

D

Js-1

E
Q28
Which of the following represents the correct precision if the length of a piece of wire is measured with a metre rule?
A
35 mm
B
35.0 mm
C
35.00 mm
D
35.01 mm
E
Q29
Which of the following is a derived unit?
A
Kilogramme
B
Metre
C
Kelvin
D
Newton
E
Q30
Two objects, one having three times the mass of the other, are dropped at the same time from a tall building. When they are above the ground the two objects will have the same
A
momentum
B
kinetic energy
C
potential energy
D
acceleration
E
Q31
Which of the following is NOT a fundamental S.I unit?
A
Metre
B
Ampere
C
Kelvin
D
Second
E
Q32
The distance travelled by a particle starting from rest is plotted against the square of the time elapsed from the commencement of motion. The resulting graph is linear. The slope of this graph is a measure of
A
initial displacement
B
initial velocity
C
acceleration
D
half the acceleration
E
half the initial velocity
Q33

For which of the underlisted quantities is the derived unit ML2T-2 correct?  I. Moment of a force  II. Work  III. Acceleration

A

I only

B

II only

C

III only

D

I and II

E

II and III

Q34
Which of the following is NOT a vector quantity?
A
Force
B
Altitude
C
Weight
D
Displacement
E
Acceleration
Q35

Of the following derived units, the one that is not a unit of power  is

A

joule/secondam

B

ampere volt

C

ampere2 volt

D

ohm2 /volt

E

volts2  / ohm

Q36
Which of the diagrams in Fig. 5 gives the correct resultant R of two vectors P and Q?
A
I
B
II
C
III
D
IV
E
V
Q37
One of the following readings represents the measurement of the length of a metal rod using vernier calipers. Taking the reading accuracy into consideration, the most likely one is
A
5.16 cm
B
1.165 cm
C
5.0 cm
D
5.160 cm
E
5 cm
Q38
The accurate measurement of the relative density of substance in power or granular form can be done using a beam balance and a
A
pipette
B
burette
C
measuring cylinder
D
density bottle
E
eureka can
Q39
A hydrometer is an instrument for measuring the
A
depth of water in a vessel
B
relative density of a liquid by the method of flotation
C
relative density of a liquid by finding the apparent loss of weigth
D
relative humidity of the air
E
atmospheric pressure when the air is humid
Q40
An example of a scalar quantity is
A
velocity
B
weight
C
electric charge
D
acceleration due to gravity
E
momentum
Q41
Which of the following physical quantities is NOT a vector?
A
Velocity
B
Work
C
Force
D
Electric field intensity
E
Magnectic induction
Q42

What are the units of thermal conductivity?

A

kg · m.sec2

B

Joule sec-1  m-1 K-1

C

kg · m

D

Newton sec-1  m-1  K-1

E

m3

Q43
The internationally agreed systems of units (SI) for physical measurements are
A
1b,ft,sec
B
g, m, sec
C
kg,m,sec
D
cm, g, sec
E
kg, cm, sec
Q44
The following are some units I. N.S II. Nm III. Nm-2 IV. JoK-1 V. J kg-1 What are  the units of latent heat?
A
I
B
II
C
III
D
IV
E
V