Chapter 1 Physical quanitity

Question 1

What is si unit of mass

Answer 1

kg

Question 2

What is the si unit of length

Answer 2

m

Question 3

Si unit of time

Answer 3

S

Question 4

Si unit of temp

Answer 4

K

Question 5

What prefixies

Answer 5

tera 10^12
giga 10^9
mega 10^6
kilo 10^3
deci 10^-1
centi 10^ -2
mili 10^-3
micro 10^-6
nano 10^-9

Question 6

What is the diameter of earth

Answer 6

10^-10

Question 7

DIameter of atom

Answer 7

10^7

Question 8

What is the precision, advantage and range of a measuring tape

Answer 8

0.1cm or 1mm
measure longer than 1m
0 to 7m

Question 9

What is the precision, advantage and range of a metre rule

Answer 9

0.1 or 1mm
measure up to 1m
0 to 100cm

Question 10

What is the precision, advantage and range of a digital vernier callipers

Answer 10

0.001cm or 0.01
can measure internal diameter and depth
0 to 15cm

Question 11

What is the precision, advantage and range of digital micrometer screw gauge

Answer 11

0.0001cm or 0.001mm
Measure very short lengths
0 to 2.5cm

Question 12

What is period

Answer 12

time taken for one oscillation

Question 13

What is frequency

Answer 13

Frequency is number of oscillations produced per second.

Question 14

formula of frequency

Answer 14

f=1/t

Question 15

How to measure period

Answer 15

Take time for 20 oscs
repeat two times and find the average
Calculate the period using formula
t/20