Physical Quantities, Units& Measurements

Question 0

What does a physical quantity consists of?

Answer 0

A numerical magnitude and a unit.

Question 1

What is a physical quantity?

Answer 1

A quantity that can be measured.

Question 2

What is the name and symbol of unit for the base quantity length?

Answer 2

Metre, m.

Question 3

What is the name and symbol of unit for the base quantity mass?

Answer 3

kilogram, kg.

Question 4

What is the name and symbol of unit for the base quantity time?

Answer 4

Second,s.

Question 5

What is the name and symbol of unit for the base quantity electric current?

Answer 5

Ampere, A.

Question 6

What is the name and symbol of unit for the base quantity temperature?

Answer 6

kelvin,K.

Question 7

What is the name and symbol of unit for the base quantity amount of substance?

Answer 7

Mole,mol.

Question 8

What is the name and symbol of unit for the base quantity luminous intensity?

Answer 8

Candela,cd.

Question 9

What is the formula for finding area?

Answer 9

Length X width.

Question 10

What is the formula for finding volume?

Answer 10

Length X width X height.

Question 11

What is the formula for finding density?

Answer 11

Mass/Volume.

Question 12

What is the formula for finding speed?

Answer 12

Distance/Time.

Question 13

What is the formula for finding acceleration?

Answer 13

Change in velocity/Time.

Question 14

What is the formula for finding force?

Answer 14

Mass X acceleration.

Question 15

What is the formula for finding pressure?

Answer 15

Force/Area.

Question 16

What is the formula for finding work?

Answer 16

Force X Distance.

Question 17

What is the formula for finding power?

Answer 17

Work/Time.

Question 18

What is the symbol and power of the prefix pico?

Answer 18

p, 10 -12

Question 19

What is the symbol and power of the prefix nano?

Answer 19

n, 10 -9

Question 20

What is the symbol and power of the prefix micro?

Answer 20

u, 10 -6

Question 21

What is the symbol and power of the prefix milli?

Answer 21

m, 10-3

Question 22

What is the symbol and power of the prefix centi?

Answer 22

c,10-2

Question 23

What is the symbol and power of the prefix deci?

Answer 23

d,10-1

Question 24

What is the symbol and power of the prefix kilo?

Answer 24

k,10 3

Question 25

What is the symbol and power of the prefix mega?

Answer 25

M, 10 6.

Question 26

What is the symbol and power of the prefix giga?

Answer 26

G,10 9.

Question 27

What is the symbol and power of the prefix Tera?

Answer 27

T, 10 12.

Question 28

What is a scalar and name a few examples.

Answer 28

1. Physical quantity that only has magnitude. | 2. Mass,time, length, energy, density.

Question 29

What is a vector and name a few examples.

Answer 29

1. Physical quantity that has both magnitude and direction. | 2. Displacement, velocity, force and momentum.

Question 30

What is the S1 unit for length?

Answer 30

metre, m.

Question 31

Which errors should we avoid when using the metre ruler?

Answer 31

1. Parallex error | 2. End error.

Question 32

How do we avoid the parallax error?

Answer 32

Line of vision should be perpendicular to the scale.

Question 33

What is the function of the inside jaws of the vernier calipers?

Answer 33

Measuring internal diameter or length.

Question 34

What is the function of the outside jaws of a vernier caliper?

Answer 34

Measuring external diameter or length.

Question 35

What is the tail of a vernier caliper for?

Answer 35

Measuring length.

Question 36

What is the range of measurement and precision of a measuring tape?

Answer 36

Range: 0-5m Precision: 0.1cm

Question 37

What is the range of measurement and precision of a meter ruler?

Answer 37

Range:0-1m Precision: 0.1cm

Question 38

What is the range of measurement and precision of a vernier caliper?

Answer 38

Range:0-15cm Precision: 0.01cm

Question 39

What is the range of measurement and precision of a micrometer screw gauge?

Answer 39

Range: 0-2.5cm Precision: 0.01mm

Question 40

Each division on a micrometer screw gauge represents what distance?

Answer 40

0.50mm/50 = 0.01mm.

Question 41

What are some precautions we have to take when using the micrometer screw gauge?

Answer 41

1. Thimble not tightened too much. 2. Clean ends of anvil and spindle. 3. Check for systematic error.

Question 42

What is zero error caused by?

Answer 42

Due to instruments that do not read exactly 0 when there is nothing being measured.

Question 43

What is used to measure an internal of time?

Answer 43

Stopwatch.

Question 44

The period T of a pendulum is independent of?

Answer 44

1. Amplitude of oscillation | 2. Mass of bob

Question 45

What is an oscillation?

Answer 45

Time for one complete swing(Time where bob passes through middle the second time) of a pendulum