PHYSICS
MEASUREMENT
TEXT
BOOK EXERCISES
I. Choose the correct answer:
1.
Choose the correct one.
(a)
mm < cm < m < km
(b)
mm > cm > m > km
(c)
km < m < cm < mm
(d)
mm > m > cm > km
[Answer: (a) mm < cm < m < km]
2.
Rulers, measuring tapes and metre scales are used to measure
(a)
mass
(b)
weight
(c)
time
(d)
length
[Answer: (d) length]
3.
1 metric ton is equal to
(a)
100 quintals
(b)
10 quintals
(c)
1/10 quintals
(d)
1/100 quintals
[Answer: (b) 10 quintals]
4.
Which among the following is not a device to measure mass?
(a)
Spring balance
(b)
Beam balance
(c)
Physical balance
(d)
Digital balance
[Answer: (a) Spring balance]
II. Fill in the blanks :
1. Metre is
the unit of length .
2. 1 kg of
rice is weighed by beam balance.
3.
Thickness
of a cricket ball is measured by vernier
caliper.
4. Radius
of a thin wire is measured by screw gauge.
5. A
physical balance measures small differences in mass up to 1 mg or less.
III. State whether true or false. If false, correct the
statement :
1. The SI
unit of electric current is kilogram.
Answer: False.
Correct statement: The SI unit of electric current
is ampere.
2. Kilometre
is one of the SI units of measurement.
Answer: True.
3. In
everyday life, we use the term weight instead of mass.
Answer: True.
4. A
physical balance is more sensitive than a beam balance.
Answer: True.
5. One
Celsius degree is an interval of 1 K and zero degree Celsius is 273.15 K.
Answer: True.
6. With the
help of vernier caliper we can have an accuracy of 0.1 mm and with screw gauge
we can have an accuracy of 0.01 mm.
Answer: True.
IV. Match the following :
1.
Length
- kelvin
Mass
- metre
Time
- kilogram
Temperature
- second
Answer:
Length - metre
Mass - kilogram
Time - second
Temperature - kelvin
2.
Screw
gauge - Vegetables
Vernier
caliper - Coins
Beam
balance - Gold ornaments
Digital
balance - Cricket ball
Answer:
Screw gauge - Coins
Vernier caliper - Cricket ball
Beam balance - Vegetables
Digital balance - Gold ornaments
V. Assertion and reason type questions :
Mark the correct answer as :
(a)
Both A and R are true but R is not the correct reason.
(b) Both A and R are true and R is the correct
reason.
(c)
A is true but R is false.
(d)
A is false but R is true
1. Assertion (A) : The scientifically correct
expression is “The mass of the bag is 10 kg”
Reason (R) : In everyday life, we use the term weight
instead of mass.
(a) Both A and R are true but R
is not the correct reason.
(b) Both A and R are true and R is the correct
reason.
(c)
A is true but R is false.
(d)
A is false but R is true
[Answer: (a) Both A and R are true but R is not the correct
reason.]
2. Assertion (A) :
0°C = 273.16 K. For our convenience we take it as 273 K after rounding off the
decimal.
Reason (R) : To convert a temperature on the Celsius
scale we have to add 273 to the given temperature.
(a)
Both A and R are true but R is not the correct reason.
(b)
Both A and R are true and R is the correct reason.
(c)
A is true but R is false.
(d)
A is false but R is true
[Answer: (b) Both A and R are true and R is the correct reason.]
3. Assertion (A) :
Distance between two celestial bodies is measured in terms of light year.
Reason (R) : The distance travelled by the light in one
year is one light year.
(a)
Both A and R are true but R is not the correct reason.
(b) Both A and R are true and R is the correct
reason.
(c)
A is true but R is false.
(d) A is false but R is true
[Answer: (d) A is false but R is true]
Assertion: Distance between two celestial bodies is
measured in terms of astronomical unit.
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