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UNITS AND MEASUREMENT and Structure of atom

Total questions: 50

Worksheet time: 50mins

Name
Class
Date
1.

The SI unit of time is the

a)

minute.

b)

hour.

c)

second.

d)

day.

2.

An accepted international system of measurement, also known as SI units, is the

a)

International System of Units

b)

System of International Measurements

c)

System of Intellectual Units

d)

Units of International Measurement

3.

Which of the following is the SI system's base unit for amount of a substance?

a)

kilogram

b)

gram

c)

mole

d)

pound

4.

The basic unit of length in the metric system is the

a)

foot.

b)

kilometer.

c)

meter.

d)

mile.

5.
Which of the following pairs of physical quantity and SI unit is correct ?
a)
Mass - SI unit : Gram
b)
Time - SI unit : Hour
c)
Electric current - SI unit : Volt
d)
Temperature - SI unit : Kelvin
6.

SI stands for ___.

a)

Sports Illustrated

b)

Scientific Notation

c)

International System (of measurements)

d)

Instructional System (of measurements)

7.

The diagram shows part of a ruler. The ruler is used to find the length of a nail.

What is the length of the nail?

a)

2.2 cm

b)

2.7 cm

c)

3.2 cm

d)

3.7 cm

8.

The unit of measurement for Mass

a)

centimeters or meters

b)

feet or inches

c)

grams or kilograms

d)

Kelvin andand celcius

9.

The unit to measure Temperature

a)

Celsius or Kelvin

b)

liters or milliliters

c)

inches or feet

d)

gram and kilogram

10.

The unit of measurement of length or distance

a)

meters or centimeter

b)

Celsius or Kelvin

c)

grams or kilograms

d)

litre and millilitre

11.

The instrument is used to measure

a)

Temperature

b)

Mass

c)

Length

d)

Volume

12.

Assertion(A) : The system of units now used is

known as the International System of Units

(SI units).

Reason(R): The SI unit of length is a centimetre.

a)

A is true and R is correct explanation for A

b)

A is true and R is not the correct explanation for A

c)

A is true R is false

d)

A is false R is true

13.

When writing the symbol for the unit of second,

how should it be placed after a numerical value?

a)

With no space (e.g., 5s)

b)

With a hyphen (e.g., 5-s)

c)

With a space (e.g., 5 s)

d)

With an apostrophe (e.g., 5's)

14.

  1. Choose the correct one

a)

km > mm > cm > m

b)

km > mm > m > cm

c)

m > km > cm > mm

d)

km > m > cm > mm

15.

The height of a person is 1.65 m.Express it

into cm.

a)

16.5 cm

b)

165 cm

c)

0.165 cm

d)

1650 cm

16.

Velocity of a car is given by 18 m/s. Here

the magnitude of velocity is ? 

a)

18

b)

Velocity

c)

m/s

d)

Unit

17.

Rohan was asked to measure the length and breadth of the box by his teacher. He used a metre scale for measurement and placed the scale as shown in the diagram. Which is this the correct way of measuring the box?

a)

(a)

b)

(b)

c)

both (a) and (b)

d)

None of these

18.

The distance between Delhi and Kanpur is usually expressed in

a)

metre

b)

Kilometre

c)

hectometre

d)

millimetre

19.

5 kilometres are equal to

a)

5000 m

b)

50,000 m

c)

500 m

d)

500000 m

20.

one angstrom unit = ______m and ________cm

a)

10-12 and 10-10

b)

10-8 and 10-6

c)

10-6 and 10 -4

d)

10-10 and 10-8

21.

Light year is the unit of _____

a)

TIME

b)

DISTANCE

c)

MASS

d)

AREA

22.

What is the derived unit for area?

a)

square meter

b)

cubic meter

c)

kilograms per cubic meter

d)

grams per mole

23.

3. Unit of mass in MKS system is:-

a)

kilogram

b)

gram

c)

pound

d)

all the above

24.

Which one is not a physical quantity?

a)

length

b)

mass

c)

time

d)

kilogram

25.

The unit m3 is used to express

a)

volume

b)

mass

c)

length

d)

density

26.
What is the atomic number of this atom?
a)
1
b)
3
c)
4
d)
7
27.

Find the number of neutrons in the nucleus of an atom with atomic number 17 and mass number 37.

a)

17

b)

18

c)

19

d)

20

28.

An element has 20 neutrons and 15 protons. Find the mass number of the atom.

a)

25

b)

20

c)

30

d)

35

29.
How many electron shells/levels does this atom have?
a)
1
b)
2
c)
3
d)
4
30.
What does the C represent?
a)
atomic mass
b)
atomic number
c)
element name
d)
chemical symbol 
31.

The atoms of an element that have the same number of protons and different numbers of neutrons are called_______

a)

Isotone

b)

Isotopes

c)

isomer

d)

Isobar

32.
What electrical charge does a proton have?
a)
+1
b)
0
c)
-1
d)
+2
33.
What is atomic number?
a)
Number of protons in an atoms 
b)
Number of neutrons in an atom
c)
Mass of an atom
d)
Charge on an atom
34.

What is the combined mass of all the protons and neutrons of an atom and is approximately equal to the number of protons and neutrons?

a)

atomic mass

b)

atomic number

c)

subatomic particles

d)

nucleus weight

35.

What is the number of protons in the nucleus of an atom that determines the chemical properties of an atom?

a)

mass number

b)

atomic mass

c)

atomic number

d)

atomic symbol

36.

What is a subatomic particle without an electric charge, located in the nucleus of an atom?

a)

neutron

b)

proton

c)

electron

d)

valence electron

37.

What is a subatomic particle with a positive charge that is in the nucleus of an atom?

a)

neutron

b)

proton

c)

electron

d)

valence electron

38.

What scientist proposed this atomic model?

a)

Dalton

b)

Thomson

c)

Rutherford

d)

Bohr

39.

Atoms are indivisible (cannot be broken down)

a)

Dalton

b)

Thomson

c)

Rutherford

d)

Bohr

40.

Atom is a positively charged cloud with embedded negative electrons

a)

Dalton

b)

Thomson

c)

Rutherford

d)

Bohr

41.

The atom is mostly large empty space with a small, dense nucleus at the center

a)

Dalton

b)

Thomson

c)

Rutherford

d)

Bohr

42.

Who came up with the first atomic theory?

a)

Dalton

b)

Socrates

c)

Thomas

d)

Rutherford

43.

Velocityof light is given by 3×10 8 m/s. Here the unit of velocity is ?

a)

18

b)

m/s

c)

Velocity

d)

S

44.

Red light has a wavelength of 7000 Å. 

         In µm it is _______

a)

0.7 µm

b)

0.07 µm

c)

70 µm

d)

700 µm

45.

Mass of electrons is given by 9.1×10 -31 kg   .  Here the unit is ? 

a)

9.1×10-31

b)

Kg

c)

Mass of electrons

d)

9.1

46.

Assertion: Measurements caused confusion and a need to develop a uniform system of measurement arose.

Reason: In ancient times, people used length of a foot, the width of a finger, the distance of a step as units of measurement.

a)

A & R is true, R is correct explanation for A

b)

A & R is true R is not the correct explanation for A

c)

A is true R is false

d)

A is false R is true

47.

When expressing a temperature of 20 degrees Celsius, how should it be written?

a)

20 o K

b)

20 C

c)

20 0C

d)

20 degree celcius

48.

What is the correct way to write the unit for ampere in a sentence?

a)

amp

b)

A

c)

Ampere

d)

a

49.

Convert 5000 nm to µm

a)

0.5 µm

b)

5 µm

c)

50 µm

d)

0.05 µm

50.

JJ Thomson was credited for the discovery of the

a)

center of the universe

b)

proton

c)

electron

d)

neutron

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