2
MCQ (Single Correct Answer)
Which of the following diagrams does not represent a streamline flow?
A
B
C
D
3
MCQ (Single Correct Answer)
Along a streamline
A
the velocity of a fluid particle remains constant
B
the velocity of all fluid particles crossing a given position is constant
C
the velocity of all fluid particles at a given instant is constant
D
the speed of a fluid particle remains constant
4
MCQ (Single Correct Answer)
An ideal fluid flows through a pipe of circular cross-section made of two sections with diameters 2.5 cm and 3.75 cm . The ratio of the velocities in the two pipes is
A
$9: 4$
B
$3: 2$
C
$\sqrt{3}: \sqrt{2}$
D
$\sqrt{2}: \sqrt{3}$
5
MCQ (Single Correct Answer)
The angle of contact at the interface of water-glass is $0^{\circ}$, ethyl alcohol-glass is $0^{\circ}$, mercury-glass is $140^{\circ}$ and methyliodide-glass is $30^{\circ}$. A glass capillary is put in a trough containing one of these four liquids. It is observed that the meniscus is convex. The liquid in the trough is
A
water
B
ethylalcohol
C
mercury
D
methyliodide
6
MCQ (Multiple Correct Answer)
For a surface molecule,
A
the net force on it is zero
B
there is a net downward force
C
the potential energy is less than that of a molecule inside
D
the potential energy is more than that of a molecule inside