Q
No: 1 Circle the correct answer. 08
1.
The
number of base units are:
a)
Three
b) Five c) Seven d) Nine
2.
75.560
is round off as:
a)
75.6 b)
75.7 c)
76.00 d) None
3.
Significant
figures in 0.000846 are
a)
Six b)
Four c)
Seven d) Three 38.
4.
The
sum of the three numbers, 2.7543, 4.10 and 1.273, up to correct decimal places
is
a)
8.1 b)
8.13 c)
8.1273 d) 8.127
5.
A
light year is a unit for
a)
Time b)
Distance c) Velocity d) Time period
6.
How
many years in one second?
a)
3.1 × 106 years b) 3.1 × 10-7 years c) 3.1 × 10-8 years d) 3.1 × 10-9 years
7.
In
equation of continuity, the units of Av is given as:
a)
Cubic meter
b) Cubic meter per second c)
Square meter per second d) Square meter
8.
The
SI unit of coefficient of viscosity is:
a)
𝑘𝑔 𝑚-1 𝑠-1 b) 𝑘𝑔 𝑚-2 𝑠-1 c) 𝑘𝑔 𝑚-2 𝑠-2 d) 𝑘𝑔 𝑚2
Short
Questions: 2×7=14
1.
Write
the dimensions of (i) Pressure (ii) Density
2.
Why
do we find it useful to have two units for the amount of substance, the
kilogram and the mole?
3.
Give
the drawbacks to use the time period of a pendulum as a time standard.
4.
Why
fog droplets appear to be suspended in air?
5.
Write
the properties of Ideal fluid.
6.
Two
row boats moving parallel in the same direction are pulled towards each other.
Explain?
7.
How
many years in 1 second?
Long
Questions: 08
1. State and prove Bernoulli’s relation for a liquid in motion.
2. Define steam line flow of fluid. Drive the relation for terminal
velocity using drag force.
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